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1
Chen, Jing, Qi Jian Cheng, You Xin Yuan, and Wei Yang. "Research on the SVC Auto-Compensating Method Based on the Variable Reactor." Applied Mechanics and Materials 321-324 (June 2013): 1414–17. http://dx.doi.org/10.4028/www.scientific.net/amm.321-324.1414.
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The objective of this work is to research on a SVC auto-compensation method to improve the power factor of the power supply system. Firstly, the principles of the reactive power compensation of FC+TCR are analyzed qualitatively. According to the deficiencies of this compensator, a novel SVC auto-compensating method based on the variable reactor is presented. The reactor controlled by anti-parallel thyristors is namely as the variable reactor in this method. The secondary-side equivalent inductance of the variable reactor is varied by adjusting the SCR firing angles. And then, the equivalent inductance of the variable reactor of the compensator branch is adjusted indirectly for compensating the corresponding reactive power after the working conditions of the load are changed. Therefore, the auto-compensating of this var compensator is realized. The auto-compensating principles of this compensator have been analyzed, and a research on the compensating parameters of this compensator is given emphatically in this paper. Finally, the essential operation steps of this SVC compensation method are given. The research of this paper has laid a theoretical foundation for this compensator in industrial applications.
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Sabino, Elizabeth Rego, Fabio Barros De Sousa, Jorge Everaldo De Oliveira, Jackson Moreira De Oliveira, Hudson Afonso Batista Da Silva, Lelis Araujo De Oliveira, Alan dos Reis Silva, Fabio Souza De Araújo, Fabrício Pinho Da Luz, and Marcos Benedito Caldas Costa. "Comparison of pre and post-dispersion compensation schemes with RZ, NRZ and Gaussian modulations for 10 GBPS and 40 GBPS transmission rates / Comparação de esquemas de compensação pré e pós-dispersão com modulações RZ, NRZ e Gaussina para as taxas de transmissão de 10 GBPS e 40 GBPS." Brazilian Journal of Development 8, no. 7 (July 8, 2022): 50322–35. http://dx.doi.org/10.34117/bjdv8n7-107.
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In this paper, we investigate two dispersion compensation methods: post-compensation, and pre-compensation for transmission rates from 10Gbps to 40Gbps with return to zero (RZ), non-return to zero (NRZ) and Guassian modulations using single fiber mode-fiber (SMF) and dispersion compensating fiber (DCF). The influence of the DCF compensator dispersion with different transmission rates was studied in order to evaluate the performance of the proposed systems. The simulation results were validated through the analysis of the quality factor (Q-factor) and the bit error rate (BER), where it was verified that the post-compensation system with Gaussian modulation offered better performance results in function of the transmission rate variation.
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Hardwick, C. D. "Reply by the author to Peter Hood." GEOPHYSICS 51, no. 1 (January 1986): 193. http://dx.doi.org/10.1190/1.1486707.
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The paper acknowledged that military‐type compensators have been used in geophysical exploration to produce useful vertical gradient maps. In fact, at NAE we flew a CAE nine‐term compensator (9‐TC), the type referred to by Dr. Hood, in a four‐engine North Star aircraft from 1964 to 1976, and many thousand line‐miles of total field survey were flown for the GSC with this system. Excellent in‐band compensations were always obtainable. However, the compensated dc value of the total field varied from compensation to compensation over a range of 40 nT. This was before the GSC’s Bourget calibration facility became operational, and we had no way of knowing when or if the correct value of compensated total field had been obtained. Furthermore, the compensation procedure required considerable flying, particularly if no a priori knowledge of the compensator settings was assumed.
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Irawan, Dedi, Azhar Azhar, and Khaikal Ramadhan. "High-Performance Compensation Dispersion with Apodization Chirped Fiber Bragg Grating for Fiber Communication System." Jurnal Penelitian Pendidikan IPA 8, no. 2 (April 30, 2022): 992–99. http://dx.doi.org/10.29303/jppipa.v8i2.1521.
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The effect of dispersion will interfere with the signal transmission. Several ways can be done in compensating the dispersion such as by utilizing dispersion compensator fiber (DCF) or chirp fiber Bragg grating (CFBG). The dispersion compensation schemes with DCF are expensive and it also causes nonlinear optical effects, meanwhile, the CFBG can reduce costs and promise better results. In this study, an Apodization Chirped Fiber Bragg Grating (ACFBG) has been developed as a dispersion compensator with Optisystem with non-return to zero (NRZ) 20 Gbps. It is found that the Gaussian Cubic-CFBG apodization with a size of 90 mm had the highest Q-factor evaluation of 20,776 dB for a 250 km dispersion compensation scheme. this result is much larger than the previous CFBG dispersion compensation scheme. This study also confirmed that the Gaussian Apodization was the best profile compared to Tanh Apodization, from the evaluation of the Q-factor, Tanh cubic-CFBG only obtained a Q-factor of 9.6 dB. Certainly, the high performance of ACFBG as a dispersion compensator is very useful to support optical communication systems
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Wang, Dazhi, Tianqing Yuan, Xingyu Wang, Xinghua Wang, and Wenhui Li. "A Composite Vectors Modulation Strategy for PMSM DTC Systems." Energies 11, no. 10 (October 12, 2018): 2729. http://dx.doi.org/10.3390/en11102729.
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The operation performance of permanent magnet synchronous motors (PMSMs) driven by direct torque control (DTC) are affected by torque error compensation and flux error compensation in each control period. The error compensational effects provided by different vectors under different control strategies are analyzed in this paper. The precondition of accurate error compensation is applied to the proposed novel composite vectors modulation strategy (CVM) for a PMSM DTC system. In CVM-DTC, the operating conditions of PMSM are divided into three cases according to the relationships between the errors and the actual error compensations, including steady-state case, dynamic-state case, and transient-state case. In order to establish the novel CVM-DTC strategy smoothly, the effect factors are introduced and used to represent the error compensational effects, which are obtained through the proposed effect factors’ controller. The analysis of error compensational effects provided by single active vector and synthetic voltage vector are described in detail while the PMSM is operated in different operation conditions. Finally, the effectiveness of the novel CVM-DTC strategy is verified through the experimental results in a 100-W PMSM drive system.
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Odunayo, H. A. "Compensation Management and Employee Commitment in Selected Banks in Lagos State." European Journal of Business and Innovation Research 10, no. 7 (July 15, 2022): 1–14. http://dx.doi.org/10.37745/ejbir.2013/vol10n7114.
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In the global world of today, for any organization such as banks to have competitive edge amidst her competitors, there must be in place a formidable compensation strategy to retain, attract, and motivate people to join the organisation. The ability of bank managers to achieve the bank corporate objectives to a large extent depends on the effective implementation of compensational packages in order to retain and motivate employees within and beyond their expectation. This study is on compensation management and employee commitment in selected deposit money banks in Lagos State, Nigeria. The problem of this research is that many Nigerian banks has failed to ensure the commitment of staff because they do not manage compensations adequately and as at when due. The objective of this study is basically to determine the effect of compensation management on employee commitment in selected deposit money banks in Lagos State. The research adopted survey research design. The population of study was 1100 and a sample of 600 was derived using Taro Yamane ‘s formula and this constitutes employees of selected three banks in Lagos State. Regression analysis test statistic at P-value of 0.05 level of significance was used in testing the hypothesis. The findings shohttps://www.eajournals.org/wp-content/uploads/Compensation-Management.pdfw that compensation management positively influences employee’s commitment in the selected deposit money banks in Lagos State. The study recommended that the management of selected deposit money banks should work on improving employees’ salaries, commissions and other direct compensations.
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Fatyga, Karol, and Dariusz Zieliński. "Sensorless Current Pulsation Compensation in a Hybrid Energy Storage." Applied Sciences 13, no. 4 (February 9, 2023): 2252. http://dx.doi.org/10.3390/app13042252.
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This paper presents a dual active bridge DC/DC converter used as an AC current compensator in a hybrid energy storage application. The AC current in the DC link appears when a three-phase, four-wire inverter operates with unbalanced output currents—for example, when trying to compensate for grid voltage unbalance. This AC current has adverse effects on the operation of the electrochemical energy storage, and it should be compensated. To achieve this, a compensator is introduced into the DC link circuit of the inverter—a DC/DC converter with a capacitor bank. The DC/DC converter is responsible for compensating the AC pulsation by creating its own pulsation with the opposite phase. In the paper, the genesis of this pulsation is explained, and a compensation circuit is proposed along with a sensorless compensation algorithm. The algorithm is based on symmetrical decomposition and is used to generate a reference signal for the compensator. The numerical analysis of the algorithm is presented, and the operation of the compensator is verified on the laboratory bench.
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Li, Xiaoping, Yan Yan, and Liuyang Yao. "‘Get a Fish’ vs. ‘Get a Fishing Skill’: Farmers’ Preferred Compensation Methods to Control Agricultural Nonpoint Source Pollution." International Journal of Environmental Research and Public Health 17, no. 7 (April 5, 2020): 2484. http://dx.doi.org/10.3390/ijerph17072484.
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Ecological compensation is an important means for controlling agricultural nonpoint source pollution, and compensation methods comprise an essential part of the compensation policy for mitigating this form of pollution. Farmers’ choice of compensation methods affects their response to compensation policies as well as the effects of pollution control and ecological compensation efficiency. This study divides ecological compensation methods into two distinct philosophies—the “get a fish” method (GFM) and “get a fishing skill” method (GFSM)—based on policy objectives, to determine farmers’ choice between the two methods and the factors influencing this choice. Furthermore, by analyzing survey data of 632 farmers in the Ankang and Hanzhong cities in China and using the multivariate probit model, the study determines farmers’ preferred option among four specific compensation modes of GFM and GFSM. The three main results are as follows. (1) The probability of farmers choosing GFM is 82%, while that of choosing GFSM is 51%. Therefore, GFM should receive more attention in compensation policies relating to agricultural nonpoint source pollution control. (2) Of the four compensation modes, the study finds a substitution effect between farmers’ choice of capital and technology compensations, capital and project compensations, material and project compensations, while there is a complementary relationship between the choice of material and technology compensations. Therefore, when constructing the compensation policy basket, attention should be given to achieving an organic combination of different compensation methods. (3) Highly educated, young, and male farmers with lower part-time employment, large cultivated land, and a high level of eco-friendly technology adoption and policy understanding are more likely to choose GFSM. Hence, the government should prioritize promoting GFSM for farmers with these characteristics, thereby creating a demonstration effect to encourage transition from GFM to GFSM.
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Qu, Song, Nico Heerink, Ying Xia, and Junping Guo. "Farmers’ satisfaction with compensations for farmland expropriation in China." China Agricultural Economic Review 10, no. 4 (November 5, 2018): 572–88. http://dx.doi.org/10.1108/caer-07-2016-0094.
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Purpose The purpose of this paper is to examine the impact of the compensation amount as well as the mode through which compensations are paid on farmers’ satisfaction with the compensation received for farmland expropriation in China. Design/methodology/approach Using rural household survey data collected among 450 households in three provinces, located in eastern, central and western China, this paper estimates the impacts of compensation payments, compensation modes, household characteristics and other control variables on farmers’ satisfaction applying an ordinal probit model. Findings The major findings are: farmers’ satisfaction with the compensation depends not only on the size of the compensation but also on the gap between the compensation and the market value of the expropriated land; and the compensation amount positively affects farmers’ satisfaction when the social security compensation mode is used, but does not significantly affect farmers’ satisfaction when other modes are used. Originality/value First, it contributes to the literature on farmland expropriation by providing empirical evidence of the direct impact of the compensation amount and other factors on the degree of farmers’ satisfaction with farmland compensations. Second, potential interactions between compensation amount and compensation mode are taken into account in estimating factors affecting farmers’ satisfaction.
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OKPE, Peter O. and DR. Edirin JEROH, ACA. "PERFORMANCE-BASED COMPENSATIONS AND EARNINGS SMOOTHING IN THE NIGERIAN INDUSTRIAL SECTOR." Finance & Accounting Research Journal 4, no. 3 (October 27, 2022): 99–108. http://dx.doi.org/10.51594/farj.v4i3.388.
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One of the motivations for managing earnings as argued in the extant literature is compensation. This has raised some questions on the nature relationship between managers’ compensation methods and EM. To answer this question, this paper focused on share-based compensations, bonus-based compensations and profit-based compensation. Financial data were retrieved from the annual reports of the selected pubic industrial and consumer goods firms over 10 years spanning from 2012 to 2021. The study adopted four separate panel regression (random effect model). The results revealed that; share-based compensations, bonus-based compensations, profit-based compensations affected earnings smoothing positively and significantly. This implies that, the higher the share-based compensations, bonus-based compensations, profit-based compensations, the more managers smooth their earnings. Performance-based compensations influence earnings smoothing of quoted industrial and consumer goods firms in Nigeria significantly. Consequently, the study recommends that, the regulatory agencies should revisit the governance code in order to review the compensation options available to managers and directors of the company. Again, owners and other key stakeholders should be cautious of the tendency for managers to engage in earnings smoothing especially when the outcome is favourable to managers. Keywords: Share-Based Compensations, Bonus-Based Compensations, Profit-Based Compensations, Earnings Management.
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Zhou, Chen, Yi Hui Zheng, Gang Yao, Li Xue Li, Xin Wang, and Yan Wen Liu. "A New Control Strategy for the STATCOM Based on Multi-Model Neural Network PI Controller." Applied Mechanics and Materials 448-453 (October 2013): 2171–74. http://dx.doi.org/10.4028/www.scientific.net/amm.448-453.2171.
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Aiming to dealing with the problems of power factor compensation and the limitations of the conventional PI controller in the Static Synchronous Compensator (STATCOM), a new control strategy based on multi-model and neural network PI controller is proposed. This control scheme applied the multi-model and neural network technology to the PI controller to meet the accuracy and speed of the power factor compensation under different impact loads. Meanwhile, the neural network technology is used to tune the PI controller parameters values according to an optimal control law, which can meet the requirements of full range working conditions and optimality. Simulation experiments show that compared to the traditional PI controller, PI controller based on multi-model and neural network is proved to be better capable of adapting to the changes of impact loads with a higher compensating precision, which makes the power factor maintained at about 1 after compensation.
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Qin, Li Jun, and Chao Xiong. "A Research on Fixed Series Compensation." Advanced Materials Research 986-987 (July 2014): 192–95. http://dx.doi.org/10.4028/www.scientific.net/amr.986-987.192.
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Series compensation can improve the line efficiency significantly, reduce line loss and raise line voltage obviously. The paper introduces the basic principles of series compensation, and studies the influence of series compensation’s installation position on compensation effect, the loss reduction effect of series compensation as well as the influence of series compensation on power flow control.
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Liu, Min (Shirley). "Did CEO’s Equity-Based Compensation Benefit Firms at All? – Evidence From the Regime Before Adoption of Statement of Financial Accounting Standards 123(R)." International Journal of Accounting and Financial Reporting 8, no. 2 (April 25, 2018): 1. http://dx.doi.org/10.5296/ijafr.v8i2.13058.
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Previous studies documented empirical evidence that stock- and option-based compensation exacerbates the agency problem, which is opposite to the goal of awarding such kind of compensations to executives. If the stock- and option-based compensation is so bad, why did companies previously adopt such kind of compensation method. I use data from 1992-2005, a period before the adoption of FAS 123 (R), to examine whether the stock-based and option-based compensation benefits firms at all. I find that the firms, whose CEOs received higher values of stock- and option- compensations, have higher accruals quality and more predictable reported earnings, as well as enjoy lower implied costs of equity capital.These findings are robust to various sensitivity tests. The results indicate that such compensation method at least provided certain benefits to the firms.
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Li, Sheng, Xin Hua Yao, and Jian Zhong Fu. "Thermal Deformation Errors Compensation System of Machine Tools." Advanced Materials Research 201-203 (February 2011): 1657–61. http://dx.doi.org/10.4028/www.scientific.net/amr.201-203.1657.
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This research presents a design of a thermal deformation errors compensation system for CNC machine tools which can compensate thermal deformation of Z-axis during the working time. The thermal deformation errors compensation system includes three instruments: displacement tester, temperature tester and thermal errors compensator. Displacement and temperature testers have been designed in the early researches, and the thermal errors compensator is designed in this research. The compensation process includes two parts, modeling part and compensation part. Modeling part focuses on making a model of thermal deformation, and compensation part focuses on using the model to compensate the thermal deformation of Z-axis during the working time.
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Baganz, Gösta F. M., and Daniela Baganz. "Compensating for Loss of Nature and Landscape in a Growing City—Berlin Case Study." Land 12, no. 3 (February 26, 2023): 567. http://dx.doi.org/10.3390/land12030567.
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By 2030, around 194,000 new dwellings will be built in Berlin, including almost 52,000 in 16 new urban districts. These and other interventions will impact the city’s nature and landscape. An important means of compensating for these losses is a land-use planning eco-account adapted to Berlin’s needs. It relies on a whole-city compensation concept consisting of three pillars: flagship projects, thematic programmes, and the integrated enhancement of existing land uses. Impacts can be offset in advance via the eco-account. The institutional and legal backgrounds, as well as the allocation of compensations to interventions and the principle of the loss–gain calculation using value points, are presented. Housing construction and its preponed compensation trigger land-use changes. Critical factors affecting this process were identified and categorised as population development, housing requirement, resulting intervention, land-use change, and preponed compensation. A modified causal loop diagram was created to visualise the interdependencies and link the polarities of the derived key variables. The challenges of compensation without a net loss of biodiversity and ecosystem services, as well as solutions for avoiding impacts to achieve the goal of no net land take, are discussed. The compensatory approach presented here could be transferred to other growing cities.
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Chen, Yu, and De Zhang Xu. "The Dynamic Compensating Research of the Fingertip Force Sensor." Advanced Materials Research 308-310 (August 2011): 1395–400. http://dx.doi.org/10.4028/www.scientific.net/amr.308-310.1395.
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This paper discusses the subject that including the dynamic compensation of finger force sensor researching, the dynamic compensation based on the FLANN method and the dynamic compensator realization. This design mainly uses the operational amplifier to carry on dynamic compensation, its mathematical model is equivalent two step model to design dynamic compensator, which enhance the dynamic response characteristic of the fingertip sensor.
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Chen, JinBo, and WenYu Hu. "MATLAB Simulation Research on Static Var Compensator." E3S Web of Conferences 256 (2021): 01022. http://dx.doi.org/10.1051/e3sconf/202125601022.
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TCR-TSC static reactive power compensator (SVC) is the most widely used in the field of power system reactive power compensation. This type of reactive power compensator can not only compensate the reactive power required in the power system, but also handle the over-compensation problem well. This paper will establish a MATLAB simulation model to simulate the TCR-TSC SVC, focusing on the dynamic reactive power compensation characteristics of the TCR-TSC SVC in suppressing voltage fluctuations. The simulation results show that the TCR-TSC SVC has a better dynamic reactive power compensation effect.
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Xue, Chenyang, Chaofeng Shao, and Junli Gao. "Ecological Compensation Strategy for SDG-Based Basin-Type National Parks: A Case Study of the Baoxing Giant Panda National Park." International Journal of Environmental Research and Public Health 17, no. 11 (May 31, 2020): 3908. http://dx.doi.org/10.3390/ijerph17113908.
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An ecological compensation mechanism is the basic condition for the sustainable development of national parks and the key institutional measure to implement goals 1, 3, 6, 10, 12, 13, 15, 16, and 17 of the sustainable development goals. In this study, the current ecological compensation mechanism was summarized and analyzed from the aspects of promotion mode, realization routine, and implementation effect, on the basis of the sustainable development needs of national parks and the public welfare character in construction and management. In addition, the practical demands of ecological compensation for basin-type national parks were presented in the setting of the main body and mode of multiparticipation, and the key points of compensation. The “1 + 1 + N” basin-type national park ecological compensation system was designed on the basis of the framework of horizontal protection and vertical development. Taking the Baoxing Giant Panda National Park as an example, typical compensation scenarios were designed from five common compensation approaches; namely, fund, project, technology, material, and policy compensations. The compensation modes were selected and the effect was predicted in combination with local actual situation. Finally, the optimal combination scheme of ecological compensations for national parks was determined on the basis of the return on investment index.
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Shamshul Haq, S., D. Lenine, and S. V. N. L. Lalitha. "A Fuzzy adaptive hysteresis band controller for three phase four wire UPQC." International Journal of Engineering & Technology 7, no. 2.8 (March 19, 2018): 652. http://dx.doi.org/10.14419/ijet.v7i2.8.10551.
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Unified Power Quality Compensator (UPQC) is used to protect the sensitive loads in the distribution system from voltage and current disturbances. The compensation capability of UPQC depends on the control strategies used for shunt and series converters. Conventional adaptive hysteresis controller pulse width modulation technique had failed to track exactly during transient conditions and disturbances at load and source side. In paper fuzzy adaptive hysteresis controller is proposed for three phase four wire UPQC for compensating voltage sag/swell, current harmonics, voltage harmonics and neutral current compensation. Fuzzy adaptive hysteresis controller can effectively compensate the power quality problems during the transient conditions. A comparative simulation analysis of proposed and conventional methods are presented in this paper using MATLAB/SIMULINK tool.
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Ma, Wei, Li Zhang, and Jian Lin Yang. "A Study on the System and Mechanism of Ecological Compensation for Coal Mining Areas：Based on the Theory of Complex System." Advanced Materials Research 524-527 (May 2012): 2987–91. http://dx.doi.org/10.4028/www.scientific.net/amr.524-527.2987.
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In this paper, mechanism of ecological compensation is taken as a kind of relative position and correlation among supplier, user of compensating resource and regulator of compensation process in the system of ecological compensation, and it is regarded as functions and doing work for system of ecological compensation. On this basis, this article gives the derivation and description of the connotation and extension of system and mechanism of ecological compensation for coal mining areas.
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Morais, Vítor A., João L. Afonso, Adriano S. Carvalho, and António P. Martins. "New Reactive Power Compensation Strategies for Railway Infrastructure Capacity Increasing." Energies 13, no. 17 (August 25, 2020): 4379. http://dx.doi.org/10.3390/en13174379.
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In AC railway electrification systems, the impact of reactive power flow in the feeding voltage magnitude is one aspect contributing to the quality of supply degradation. Specifically, this issue results in limitations in the infrastructure capacity, either in the maximum number of trains and in maximum train power. In this paper, two reactive power compensation strategies are presented and compared, in terms of the theoretical railway infrastructure capacity. The first strategy considers a static VAR compensator, located in the neutral zone and compensating the substation reactive power, achieving a maximum capacity increase up to 50% without depending on each train active power. The second strategy adapts each train reactive power, achieving also a capacity increase around 50%, only with an increase of the train apparent power below 10%. With a smart metering infrastructure, the implementation of such compensation strategy is viable, satisfying the requirements of real-time knowledge of the railway electrification system state. Specifically, the usage of droop curves to adapt in real time the compensation scheme can bring the operation closer to optimality. Thus, the quality of supply and the infrastructure capacity can be increased with a mobile reactive power compensation scheme, based on a smart metering framework.
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Knoke, Thomas, Patrick Hildebrandt, Daniel Klein, Rodrigo Mujica, Martin Moog, and Reinhard Mosandl. "Financial compensation and uncertainty: using mean-variance rule and stochastic dominance to derive conservation payments for secondary forests." Canadian Journal of Forest Research 38, no. 12 (December 2008): 3033–46. http://dx.doi.org/10.1139/x08-137.
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The expected opportunity costs of conserving a specific land use are usually considered adequate as financial compensation. However, a “conservation premium” is sometimes proposed as an added incentive, i.e., compensation greater than the expected opportunity costs. This paper discusses various methodological opportunities for deriving effective compensation under uncertainty. Based on cumulative distribution functions of possible opportunity costs (a Douglas-fir ( Pseudotsuga menziesii (Mirb.) Franco) plantation was considered the alternative to conserving a Chilean secondary forest), generated through Monte Carlo simulations, we derived an inclusive range of possible compensations from 77 up to 375 US$·ha–1·year–1. If we assumed that the two land-use alternatives were mutually exclusive and independent from other risky investments, a compensation of 375 US$·ha–1·year–1 was necessary to convince every decision maker to maintain the secondary forest. However, only 77 US$·ha–1·year–1 was enough for a risk-averse decision maker (given average opportunity costs of 113 US$·ha–1·year–1). Yet, it turned out that the greatest possible opportunity costs would already be compensated for with 199 US$·ha–1·year–1, given an error probability of 0.05. Compensating for the last 5% of possible opportunity costs would thus require an additional 176 US$·ha–1·year–1. Our approach had two main limitations, namely we did not consider portfolio effects, which would allow diversifying away unsystematic risks, and we did not take into account the different systematic risks of the compared alternatives. These limitations may have led to an overestimation of effective compensation.
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Tępiński, Jarosław. "Converter Compensation of Reactive Power Consumed by the Induction Generato." Safety & Fire Technology 57, no. 1 (2021): 64–79. http://dx.doi.org/10.12845/sft.57.1.2021.5.
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Purpose: The purpose of the article is to present a reactive power compensation for small hydropower plants with an induction generator. The classic compensation with capacitors is discussed and its improvement is proposed. Instead of capacitors, a three level power electronic converter connected in parallel to the induction generator can be used to provide reactive power compensation. The purpose of the paper is to present the developed structure of an active compensator and its control method. The developed control method was verified on a laboratory stand. The project and the methods: As part of research, an active compensator was built as a three-level power electronic converter in topology with Neutral Point Clamped. Laboratory tests of a converter compensator were carried out on a stand equipped with an induction generator with a power of 7.5 kW. Laboratory system measurements were made using a power analyzer and an oscilloscope. Results: A control structure of an active compensator based on a voltage-oriented method was presented and discussed. The operation of the con- verter compensator has been verified on a laboratory stand equipped with a 7.5 kW induction generator. The compensator current reduces the reactive (inductive) component of the current consumed from a power grid to a value equal to zero. The reactive power compensator ensures that the tgφ power factor is maintained at a set value of zero, which corresponds to the total compensation of inductive reactive power consumed by an induction generator working in a hydropower plant. Operation of the active compensator did not cause a significant increase in the harmonic content in the current consumed from the power grid. Conclusions: The paper presents the issues regarding reactive power compensation in hydropower plants with induction generators. Commonly used capacitor compensation has been covered and as a result, it is proposed to replace it with power electronics converter compensation of reactive power connected in parallel induction generators. Active compensator provides compensation for the entire reactive power consumed by the induction generator. The use of the converter compensator of reactive power significantly contributes to the reduction of costs for reactive power incurred by the owners of hydropower plants. The reactive power compensator also has a positive impact on the operation of the entire power grid, power losses from the reactive component of the current on the impedances of power grid components are limited. Keywords: renewable source of electricity, reactive power, active compensator, induction generator Type of article: original scientific article
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Wang, Jie, Hui Wang, and Zhuo Xu. "Robustness Compensation Control of Simulation Loading System Based on Secondary Regulation." Applied Mechanics and Materials 232 (November 2012): 419–23. http://dx.doi.org/10.4028/www.scientific.net/amm.232.419.
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This study investigated a mathematical model which was built for a simulation loading system based on secondary regulation. Because the loading system was complicated in structure and some other factors, the control performance was not ideal. Therefore, a dynamic robust compensating controller was designed for the system. The robust compensator could improve the control system by adding the return-to-zero factor and low pass filter on the basis of PID control. This study used MATLAB to simulate the general PID control and the robust compensation control. The results of simulation showed that when the equivalent rotary inertia and damping coefficient changed, the control performance decreased. When using the dynamic robust compensation control, the influences caused by parameter variations were reduced greatly, the system robustness and control accuracy are improved.
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Saranya, T. L., G. Ezhilarasan, and Subhransu Sekhar Dash. "Mitigation of Power Quality Problems Using DSTATCOM with Reduced DC Link Voltage." Advanced Materials Research 768 (September 2013): 301–7. http://dx.doi.org/10.4028/www.scientific.net/amr.768.301.
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This paper mainly presents the DSTATCOM (Distribution Static Compensator) and its control methodology of DC capacitor voltage. Generally, the dc capacitor voltage is regulated using a PI controller where various control algorithms are used for load compensation. Whenever there is a change in load there is considerable variation in dc capacitor voltage which might affect compensation. In this work, a supervisory method is proposed to reduce the dc link rating. The reduction in dc link voltage leads to the reduction in switching frequency and hence switching losses A considerable reduction in the in dc link capacitor voltage is obtained without compromising the compensating capability. The major power quality issues discussed in this work are harmonics and power factor reduction. The performance of the proposed strategy is proved using the detailed MATLAB simulation studies.
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Sun, Qiuye, Jianguo Zhou, Xinrui Liu, and Jun Yang. "A Novel Load-Balancing Method and Device by Intelligent Grouping Compound Switches-Based Capacitor Banks Shunt Compensation." Mathematical Problems in Engineering 2013 (2013): 1–11. http://dx.doi.org/10.1155/2013/347361.
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A novel compensator topology is proposed for three-phase unbalanced loads in the distribution networks. The negative and zero sequence compensation networks are proposed using delta-connected and star-connected capacitor banks. The compensation networks are paralleled with the unbalanced load to achieve a perfect balancing of active power and a complete compensation of reactive power of the unbalanced load. Intelligent grouping compound switches are implemented to control the capacitors, where, therefore, each capacitor can be switched between phases or phase and ground. Wireless sensors are also applied to acquire the load quantities. The compensation method proposed is based on symmetrical component theory. In addition, the load compensation based on instantaneous symmetrical component theory with positive sequence online extraction is proposed under unbalanced and distorted source voltages. The proposed load-balancing method and device are applied to Liaoning, Neimenggu, and Jilin provinces. The application results are provided to validate the performance of the proposed compensator topology and compensation method.
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Cheng, Qi Jian, Jing Chen, You Xin Yuan, Xue Song Zhou, and Shi Jie Deng. "Research on a Dynamic Reactive Power Compensation Method of Composite Power Load." Applied Mechanics and Materials 602-605 (August 2014): 2840–43. http://dx.doi.org/10.4028/www.scientific.net/amm.602-605.2840.
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A large number of inductive loads need the reactive power, and the amount of the reactive power compensation is different in a state of work. The traditional static reactive power compensator is difficult to meet the needs of the reactive power compensation for the composite load reactive. Therefore, a dynamic reactive power compensation method of the composite power load is proposed in this paper. The following works have been done in the study: principle of dynamic reactive power compensation control method, topological structure of dynamic reactive power compensation device, and implementation of the dynamic reactive power compensation control method.
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Chen, Ying, and Xiang Jie Chen. "Current Detection Simulate for STATCOM Dynamic Compensation System." Key Engineering Materials 439-440 (June 2010): 378–83. http://dx.doi.org/10.4028/www.scientific.net/kem.439-440.378.
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In view of low-pressure area for dynamic reactive power compensation device application present situation, a more advanced static reactive power compensation techniques was proposed that is STATCOM (Static Synchronous Compensator-STATCOM) which based on the modern power electronic technology, and it applied to the low-voltage dynamic reactive power compensation area, developed a new and more advanced low-voltage dynamic reactive power compensation device. In this paper, STATCOM compensation system simulation model was established in MATLAB6.5, futher to study its real-time compensation. Theory analyze and simulation results indicate that compare with static capacitor compensation，dynamic compensation achieved zero phase angle between power source current and voltage on rating frequency，demand for power supply rating power is reduced and power transmission performance is ensured.
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Malik, Deepak, Geeta Kaushik, and Amit Wason. "Effects of Diverse Dispersion Compensation Formats at Different Data Rates in Light-Wave System." Journal of Optical Communications 40, no. 3 (July 26, 2019): 273–80. http://dx.doi.org/10.1515/joc-2017-0065.
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Abstract In this article, diverse dispersion compensating techniques are demonstrated and also examined their performance in the presence of nonlinearites at different data rates in between 2.5 and 20 Gbps. Dispersion compensation formats such as pre-compensation, post-compensation, hybrid (symmetrical) compensation, Fiber Bragg grating (FBG) and optical phase conjugation (OPC) are used in single-channel light-wave system. The performance is evaluated on the behalf of different parameters such as Q value, Bit error rate (BER) and eye patterns. It is observed that in dispersion compensation, hybrid compensation format gives better results than the other compensation formats. It is also observed that hybrid compensation format is suitable for high data rates up to 20 Gbps while pre- and post-compensation gives better results up to 15 Gbps and FBG and OPC formats covered better results up to 10 Gbps.
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Dong, Jun, Yan Jun Pang, Da Lin Zhang, Zheng Zhi Yu, Qing Hao Wang, Chang Bo Zhang, and Jing Liu. "The High-Voltage Reactive Power Compensation Device Applications and Innovations." Applied Mechanics and Materials 494-495 (February 2014): 1787–90. http://dx.doi.org/10.4028/www.scientific.net/amm.494-495.1787.
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This article briefly describes the modern power system of high-voltage reactive power compensation device development status, discusses the high voltage reactive power compensation device applications, with the traditional high-voltage reactive power compensation device matching, demonstration of a new generation SVC (Static Var Compensator) and SVG (STATCOM) advantages and application results. This paper focuses on the innovative technology in the new generation of high-voltage reactive power compensation device in the application, while a new generation of high voltage discussed reactive power compensation device application prospects.
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Ahmed, Osama, and Abdul Wali Abdul Ali. "Simulating and Building an Appliance Clustering Fuzzified SVC for Single Phase System." ELEKTRIKA- Journal of Electrical Engineering 20, no. 1 (April 30, 2021): 34–42. http://dx.doi.org/10.11113/elektrika.v20n1.235.
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A power system suffers from losses that can cause tragic consequences. Reactive power presence in the power system increases system losses delivered power quality and distorted the voltage. As a result, many studies are concerned with reactive power compensation. The necessity of balancing resistive power generation and absorption throughout a power system gave birth to many devices used for reactive power compensation. Static Var Compensators are hunt devices used for the generation or absorption of reactive power as desired. SVCs provide fast and smooth compensation and power factor correction. In this paper, a Fuzzified Static Var Compensator consists of Thyristor Controlled Reactor (TCR) branch and Thyristor Switched Capacitors branches for reactive power compensation and power factor correction at the load side is presented. The system is simulated using Simulink using a group of blocks and equations for measuring power factor, determining the weightage by which the power factor is improved, determining the firing angle of TCR branch, and capacitor configuration of TSC branches. Furthermore, a hardware prototype is designed and implemented with its associated software; it includes a smart meter build-up for power monitoring, which displays voltage, current, real power, reactive power and power factor and SVC branches with TRIAC as the power switching device. Lastly, static and dynamic loads are used to test the system's capability in providing fast response and compensation. The simulation results illustrated the proposed system's capability and responsiveness in compensating the reactive power and correcting the power factor. It also highlighted the proportional relation between reactive power presence and the increased cost in electricity bills. The proposed smart meter and SVC prototypes proved their capabilities in giving accurate measurement and monitoring and sending the data to the graphical user interface through ZigBee communication and power factor correction. Reactive power presence is an undesired event that affects the equipment and connected consumers of a power system. Therefore, fast and smooth compensation for reactive power became a matter of concern to utility companies, power consumers and manufacturers. Therefore, the use of compensating devices is of much importance as they can increase power capacity, regulate the voltage and improve the power system performance.
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Helen, Helen. "Pengaruh Gaya Kepemimpinan Transformasional dan Kompensasi terhadap Prestasi Atlet Tingkat Nasional Dengan Motivasi sebagai Variabel Interverning pada Dinas Pemuda dan Olahraga Provinsi Jambi." J-MAS (Jurnal Manajemen dan Sains) 8, no. 1 (April 30, 2023): 1070. http://dx.doi.org/10.33087/jmas.v8i1.944.
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The results of the research variable Transformational leadership style, compensation, motivation and achievement of athletes in the Jambi Province Youth and Sports Service using a sample of 81 respondents. Transformational leadership style (X1), Compensation (X2), motivation (Y) and Athlete achievement (Z) at the Jambi Province Youth and Sports Service, where Transformational leadership style is in the very good category, Compensation is in the good category, Athlete motivation and achievement are in the high category. Compensation has a significant effect on motivation. Therefore, it can be concluded that compensation (X2) partially has a significant effect on motivation (Y). Transformational and Compensational leadership styles together influence motivation. Therefore, it can be concluded that the results of testing Transformational and Compensatory leadership styles simultaneously have a significant influence on motivation. Transformational and Compensational leadership styles together have a significant effect on athlete performance. Therefore, it can be concluded that the test results are significant, which means Transformational and Compensational leadership styles simultaneously have a significant influence on athlete achievement. Motivation has a significant effect on athlete achievement. Therefore, it can be concluded that motivation partially has a significant effect on athlete achievement.
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Magilke, Matthew J., Brian W. Mayhew, and Joel E. Pike. "Are Independent Audit Committee Members Objective? Experimental Evidence." Accounting Review 84, no. 6 (November 1, 2009): 1959–81. http://dx.doi.org/10.2308/accr.2009.84.6.1959.
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ABSTRACT: We use experimental markets to examine stock-based compensation's impact on the objectivity of participants serving as audit committee members.We compare audit committee member reporting objectivity under three regimes: no stock-based compensation, stock-based compensation linked to current shareholders, and stock-based compensation linked to future shareholders. Our experiments show that student participants serving as audit committee members prefer biased reporting when compensated with stock-based compensation. Audit committee members compensated with current stock-based compensation prefer aggressive reporting, and audit committee members compensated with future stock-based compensation prefer overly conservative reporting. We find that audit committee members who do not receive stock-based compensation are the most objective. Our study suggests that stock-based compensation impacts audit committee member preferences for biased reporting, suggesting the need for additional research in this area.
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Li, Shengwen, Xiao Chang, Haoqing Wang, Ning Liu, Yizhao Liu, Yang Yang, and Qing Duan. "Dynamic Voltage Restorer Based on Integrated Energy Optimal Compensation." Electronics 12, no. 3 (January 19, 2023): 531. http://dx.doi.org/10.3390/electronics12030531.
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This paper presents an advanced dynamic voltage restorer with integrated energy optimal compensation (EOC-DVR), which combines the advantages of pre-sag compensation and energy minimization compensation. The performance parameters of the EOC-DVR, such as the compensatory capability, loss of energy, and duration of compensation, can be balanced by this optimal compensation strategy. Additionally, the impact on the load is further reduced by the proposed method. By analyzing the working process of optimal comprehensive energy, the compensation limit of the strategy is discussed. After that, both the voltage and active power of the system for compensating are obtained by analyzing the compensation characteristics of the strategy. Therefore, the relations of the formula and curve between the related physical quantities can be obtained. Finally, simulation results based on MATLAB/Simulink are provided to verify the effectiveness of proposed compensation method.
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Geddada, Nagesh, and Mahesh Kumar Mishra. "Improved Load Compensation using Harmonic Compensator in dq0 Current Controller for DSTATCOM." International Journal of Emerging Electric Power Systems 15, no. 6 (December 1, 2014): 569–89. http://dx.doi.org/10.1515/ijeeps-2014-0059.
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Abstract This paper presents distribution static compensator (DSTATCOM) with dq0 current controller and sine pulse width modulation (SPWM) switching for compensation of unbalanced nonlinear load in distribution system. DSTATCOM, connected in parallel to load at the point of common coupling (PCC), is used for supplying reactive and harmonic components of load current demand. This dq0 current controller is implemented in synchronous reference frame (SRF) rotating at fundamental frequency and consists of harmonic compensation (HC) regulator along with proportional integrator (PI) regulator. HC regulator is realized by number of sinusoidal signal integrators (SSIs) in parallel. The SSI provides high gain for tuned harmonic frequency and helps in minimizing filter current tracking error while compensating for load harmonic currents. Zero-axis controller, which compensates load neutral current and helps in obtaining balanced utility currents, is provided along with d, q controllers. SPWM switching generates inverter gating pulses at constant frequency, which reduces stress levels on VSI switches and simplifies the design of interface filter. Simulation studies of DSTATCOM load compensation with dq0 current controller are carried out in Matlab/Simulink and experimental verification is done using dSpace 1104 with Matlab real-time interface (RTI).
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Yan, Hai Yan, and Tao Zeng. "Simulation of Machining Errors Compensation of CNC Spiral Bevel Gear Grinding Machine." Advanced Materials Research 466-467 (February 2012): 698–703. http://dx.doi.org/10.4028/www.scientific.net/amr.466-467.698.
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Taking the eccentricity error of workpiece’s axis as an example, the real cutting pathes on the spiral bevel gear’s tooth surface and the normal errors were obtained according to each machining position. By decoupling error compensation motions, the compensation values of three translational and two rotational axes were obtained. After compensating, the tooth form errors were reduced largely. This compensation method is closer to the fact of gear grinding and the compensation effect is better than the method of adjusting machine setting parameters.
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ADJEMOV, SERGEY S., EVGENIY M. LOBOV, NIKOLAY A. KANDAUROV, ELIZAVETA O. LOBOVA, and VLADISLAV I. LIPATKIN. "ALGORITHMS OF ESTIMATING AND COMPENSATING THE DISPERSION DISTORTIONS OF WIDEBAND SIGNALS IN THE HF CHANNEL." H&ES Research 13, no. 5 (2021): 57–74. http://dx.doi.org/10.36724/2409-5419-2021-13-5-57-74.
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Introduction: radio communication in the decameter range is actively used for communication in remote and hard-to-reach regions of the world. Decameter communication is also a relevant type of radio communication for regions that have suffered serious damage due to natural disasters. The relevance of using decameter radio communication in the above cases is due to the fact that this technology can offer reliable and cheap solutions. The second area of application of decameter radio communications is communications in the Arctic and Antarctic. Practical significance: when receiving signals with a spread spectrum, it becomes necessary to take into account the effect of the frequency dispersion of the ionospheric channel, since it leads to significant distortions of the useful signal and a decrease in the quality of communication in general. An urgent task is to estimate the parameters of the frequency dispersion of the ionospheric channel and to develop algorithms and devices for compensating dispersion distortions of broadband signals. Discussion: this article presents algorithms for estimating and compensating the dispersion distortions of wideband signals in the HF channel. The subbanding estimation method and maximum likelihood estimation (MLE) of the slope of the dispersion characteristic (the slope of DC) are studied. In addition, this article examines the joint MLE of the slope of DC and other parameters of the wideband signal and offers three methods of dispersion distortion compensation. The first method of compensation is a matched filter compensation. The second one is compensation based on the filter bank. Finally, the third method uses a tracking compensator to solve the problem. The experimental results demonstrated in the article were carried out on a one jump track with a length of about 2900 km.
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Lee, Mijoo, and In Tae Hwang. "The Effect of the Compensation System on Earnings Management and Sustainability: Evidence from Korea Banks." Sustainability 11, no. 11 (June 5, 2019): 3165. http://dx.doi.org/10.3390/su11113165.
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Since the global financial crisis, management incentive compensation, which is sensitive to financial firms’ short-term performance, has been noted to threaten financial systems’ sustainability by incentivizing managers to pursue excessive risks. Subsequently, international standards have been established regarding compensation for financial institutions’ senior executives and employees. However, this compensation may impact not only banks’ risk-taking behaviors, but also their earnings management, as the latter affects financial performance while compensation is decided as a reflection of such performance. Therefore, this study analyses executive compensation’s impact on banks’ earnings management using compensation data on South Korean banks. The analysis revealed higher earnings management using a loan loss provision with more variable compensation. On the one hand, if the proportion of equity-linked compensation to incentive compensation increased, then earnings management increased. On the other hand, more deferred compensation led to increased earnings smoothing. This study evaluates regulatory impacts across multiple dimensions by analyzing the effects of incentive compensation standards—intended to increase financial systems’ sustainability—on individual financial institutions and further contributes to studies on managerial decision making.
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Liu, Suqi, and Jianping Tan. "Dynamic impedance compensation for WPT using a compensator in a three-coil wireless power transfer system." Circuit World 44, no. 4 (November 5, 2018): 171–77. http://dx.doi.org/10.1108/cw-04-2018-0022.
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Purpose The purpose of this paper is to study the wireless power transfer (WPT) system that always achieves the maximum output power at a fixed angular frequency using the dynamic impedance compensation and also the maximum transfer efficiency. Design/methodology/approach An efficient topology of the WPT system is proposed which states that the functions of the relay are transformed into the functions of the compensator in the three-coil WPT system. Findings Increasing the ratio of the frequency detuning factor of the compensator relative to the frequency detuning factor of the compensator also causes the curves of the normalized output power and the transfer efficiency to move toward the high frequency direction. Practical implications The scheme of the dynamic compensation for the WPT using a compensator is convenient to obtain the dynamic impedance compensation by adding or removing the capacitances or inductances from the compensator. Originality/value The functions of the relay are transformed into the functions of the compensator in the three-coil WPT system.
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Schulz, Karl, Aleh Tsyvinski, and Nicolas Werquin. "Generalized compensation principle." Theoretical Economics 18, no. 4 (2023): 1665–710. http://dx.doi.org/10.3982/te3971.
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Economic disruptions generally create winners and losers. The compensation problem consists of designing a reform of the existing income tax system that offsets the welfare losses of the latter by redistributing the gains of the former. We derive a formula for the compensating tax reform and its impact on the government budget when only distortionary tax instruments are available and wages are determined endogenously in general equilibrium. We apply this result to the compensation of robotization in the United States.
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Lončar, Nikola. "Third-party claims and/or direct-action lawsuits against insurers: A step toward sustainable liability insurance." Tokovi osiguranja 40, no. 1 (2024): 131–45. http://dx.doi.org/10.5937/tokosig2401131l.
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This paper aims to provide a detailed analysis of how an injured party can assert their right to compensation in motor vehicle liability insurance. It covers the procedures for compensating damages both in extrajudicial (out-of-court) processes and in judicial proceedings. The goal is to examine the procedures, rights, and obligations of both the injured party and the insurer in the compensation process for motor vehicle liability insurance. The established procedure for compensation indicates that the Serbian legislator leans towards reducing the number of compensation lawsuits by mandating that the injured party first address the insurer in an extrajudicial (out-of-court) process by filing a claim for compensation.
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Guillardi, Hildo, Eduardo Verri Liberado, José Antenor Pomilio, and Fernando Pinhabel Marafão. "General-compensation-purpose Static var Compensator prototype." HardwareX 5 (April 2019): e00049. http://dx.doi.org/10.1016/j.ohx.2018.e00049.
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Matović, Ivana Marinović. "Comparative Analysis of Executive Compensation in the Republic of Serbia and EU Countries." Economic Themes 57, no. 2 (June 1, 2019): 181–200. http://dx.doi.org/10.2478/ethemes-2019-0011.
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AbstractExecutive compensations have a strong motivation role in contemporary business organizations. Adequate models of compensation enable attracting and retaining the high-capacity managers. This way, business organization conquers and maintains the competitive position in the context of globalization. It is necessary to align the executive compensation with the business organization’s strategy, which requires careful process of planning, done by the highest levels of management and ownership. The main objective of the paper is to explore and compare the structure and the level of executive compensation in the Republic of Serbia and EU countries. The paper focuses on executive compensation components, primarily long-term and short-term incentives, as well as sallary and benefits. A comparative analysis of executive compensation models was performed to explain the differences in the observed countries.The study found large and disproportionate differences in the executive compensation levels, conditioned mostly by the economic development of the observed economies.
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Zhu, Xue Ling, Wen Si Cao, and Xiao Ming Zhou. "Research on Methods of Reactive Compensation for Unbalanced Current in Three-Phase Four-Wire Low-Voltage Distribution System." Advanced Materials Research 347-353 (October 2011): 1156–60. http://dx.doi.org/10.4028/www.scientific.net/amr.347-353.1156.
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Different condition of unbalanced current of three-phase four-wire low-voltage distribution system is analysed in this paper. The model of unbalanced reactive power compensation is built which is fit for the three-phase four-wire system ,Using phase-to-phase or phase-to-earth capacitance or inductance can transfer active power. Control the neutral current to be zero and three-phase current balanced by means of reactive power compensation. A compensating phase judgment approach is presented, the mathematic model of calculating phase current, phase compensating capacity line current and line-to-line compensating capacity is gave. Simulation result of physical system shows that the neutral current can be controlled to be zero and the phase current balanced. It substantiate that this compensation method is valid and optimize the operation condition of loads.
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Wang, Jin E., and Zhen Dong Zhou. "Research on the Stiffness Error Compensation of the Floor Type Boring-Milling Machining Centre." Advanced Materials Research 889-890 (February 2014): 1014–17. http://dx.doi.org/10.4028/www.scientific.net/amr.889-890.1014.
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For the floor type boring-milling machining center, when the ram and the spindle protrude from the headstock, a cantilever-like structure is formed which will lead to great stiffness error and will affect the machining accuracy of the workpiece without compensation. It has been a difficult problem to fulfill the compensation of this stiffness error. Regarding this issue, a new method is discussed in this paper to realize this kind of compensation. By combining linear superposition principle, optimization theory with the FEA analysis, a formula is presented to calculate the oil pressure of the compensating system, which describes the relationship between the oil pressure of the compensating hydraulic cylinder and the stroke of the ram. Therefore, the oil pressure of the compensating system can be accurately calculated.
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Ai, Xing, Li Na Zheng, Jing Ni Xiao, Lei Zhang, and Luo Wang. "Ecological Compensation Mechanism of Liaoning Seas." Applied Mechanics and Materials 675-677 (October 2014): 471–75. http://dx.doi.org/10.4028/www.scientific.net/amm.675-677.471.
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Liaoning seas have been facing severe environmental problems. To solve the marine ecological problems effectively, the marine ecological compensational mechanism of these areas should be established and improved gradually. By reference the successful stories of ecological compensation mechanism applied in other areas and the study of the basic ideas and focal point of the ecological compensation mechanism, we finally work out the suitable ecological compensation mechanism with fluidity, complexity and universality.
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Zhang, Lan, Yu Tao Zhang, Li Quan Wang, and Zhi Peng Wang. "Design and Dynamic Characteristics Research of Hydraulic Compensator in Deep Water." Applied Mechanics and Materials 574 (July 2014): 603–8. http://dx.doi.org/10.4028/www.scientific.net/amm.574.603.
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In this paper, mechanical model of traditional bellow type pressure compensator is established. The analysis of static characteristic shows that compensation volume and variation of pressure compensate margin are limited to each other. As a result, it cannot meet the requirements of marine equipment to the underwater hydraulic power. Therefore, a new type of pressure compensation unit is developed, it has advantages of big volume compensation and almost constant pressure compensate margin, it solves the core technical problem of deep-water balancing hydraulic power. The simulation results show that this new type of pressure compensator can satisfy the design requirements and improve the working depth of underwater hydraulic systems sharply.
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Wang, Zhikun, Yanting Zhang, Ruifeng Wang, and Lumeng Huang. "Design and study of new riser dynamic load compensation device test system." Journal of Physics: Conference Series 2029, no. 1 (September 1, 2021): 012084. http://dx.doi.org/10.1088/1742-6596/2029/1/012084.
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Abstract To ensure the safety of the riser, a kind of new riser dynamic load compensation device is used in this paper, which can effectively reduce the dynamic load of the riser. At the same time, according to a certain similarity criterion, the riser dynamic load compensation test system was designed, including heave simulation system, load simulation system and compensation system. The co-simulation model of the system was established by using ADAMS and Simulink, and the effects of accumulator volume, precharge pressure, piston rod area of compensating hydraulic cylinder and throttle time constant on the system performance were analyzed. The simulation results show that the dynamic load compensation device has a certain compensation effect.
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WANG, YONG, ZHENGSHI LIU, KAI HE, ENWEI CHEN, and YUNJIAN GE. "ANALYSIS ON THE INFLUENCE OF MODELING ERRORS ON SENSOR DYNAMIC COMPENSATION." International Journal of Information Acquisition 01, no. 03 (September 2004): 249–58. http://dx.doi.org/10.1142/s0219878904000288.
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The relationship between modeling error of the system and widening multiple of the working frequency band was analyzed quantitatively and its spectrums were obtained. They offered a criterion to estimate the feasibility and effect in engineering practice of the compensating method to improve the sensor's dynamic characteristics, and proved that the compensating method has good reliability. Conclusions were drawn clearly: For a first-order system, the compensation effect is conspicuous, which only relates to modeling error but is independent of time constant; for a second-order system, the compensation effect is determined by modeling error and damping ratio. Within a wide range, if the damping ratio is larger, the modeling precision required to obtain the same compensation effect can be lower. Through quantitatively analysis, we found that the modeling precision in dynamic compensation with analogy or digital filter should not be so high as one is taken for granted currently.
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Zhang, Lian Jun, Chun Li He, and Guang Jun Chen. "Application of Tool Compensation in CNC Machining." Materials Science Forum 800-801 (July 2014): 435–39. http://dx.doi.org/10.4028/www.scientific.net/msf.800-801.435.
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Tool compensation determines the machining precision and quality . There are tool length compensation,tool radius compensation and corner radius compensation in CNC system .The parameters of these compensation are all static.The purpose of this study was that the machining precision and quality were improved by changing the parameters of tool compensation,based upon changing the static parameters into the dynamic parameters of tool compensation.The three tool compensations were introduced and discussed about these being used in machining process and the function in processing.The concept of dynamic tool compensation was proposed in this paper. The method was used that the dynamic parameter substituted the static parameter in the processing by calculating . The process machining crafts information was included in tool compensation in every process step. The computer program was finished about how to calculate the dynamic parameter. The results indicate that high-precision machining is within the range of the maximum probability and the large machining error is within the range of the minimum probability by useing this method. Further more, the end qualified product is more than before.Process indicators and tool compensation merged is a breakthrough research by probability calculating for impoving the machining precision.We confirmed that the proposed method could be l used widely.