Bibliografías temáticas / Voltage drop compensator

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Literatura académica sobre el tema "Voltage drop compensator"

Autor: Grafiati

Publicado: 25 de mayo de 2024

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Artículos de revistas sobre el tema "Voltage drop compensator"

Karoui, Ridha, Abdelkarim Aouiti, Maha Zoghlami y Faouzi Bacha. "Impact of static synchronous compensator on the stability of a wind farm: Case study of wind farm in Tunisia". Wind Engineering 40, n.º 6 (6 de octubre de 2016): 555–68. http://dx.doi.org/10.1177/0309524x16671193.

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The static synchronous compensator is one of the FACTS (Flexible Alternating Current Transmission System) device capable of maintaining the stability of wind turbines during a sudden default. Among these faults, the voltage drops at the connection bus wind turbines. For this fault case, the static synchronous compensator intervenes by injection of the reactive power to compensate the voltage drop. In this article, as application case, we study the wind farm of Bizerte (north of Tunisia). This farm is composed of fixed speed aero-generators using squirrel cage induction generators. Our study begins with modeling the wind system. Next, we describe the technical requirements for connection of a wind energy system to the grid and outfit at the voltage dips (low-voltage ride through) according to STEG (Tunisian Company of Electricity and Gas). We also present the structure of static synchronous compensator. Finally, we present the simulation results of the wind farm under low-voltage ride through with and without static synchronous compensator.

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da Silva, Rui Jovita G. C., A. C. Zambroni de Souza, Rafael C. Leme y Dabit Sonoda. "Decentralized secondary voltage control using voltage drop compensator among power plants". International Journal of Electrical Power & Energy Systems 47 (mayo de 2013): 61–68. http://dx.doi.org/10.1016/j.ijepes.2012.10.009.

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Dandotia, Ashish, Mukesh Kumar Gupta, Malay Kumar Banerjee, Suraj Kumar Singh, Bojan Đurin, Dragana Dogančić y Nikola Kranjčić. "Optimal Placement and Size of SVC with Cost-Effective Function Using Genetic Algorithm for Voltage Profile Improvement in Renewable Integrated Power Systems". Energies 16, n.º 6 (10 de marzo de 2023): 2637. http://dx.doi.org/10.3390/en16062637.

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Given the concern for maintaining voltage stability in power systems integrated with renewable power systems due to a mismatch in generation and demand, there remains a need to invoke flexible alternating current transmission system (FACTS) devices in the distribution network. The present paper deals with identifying the locations of placement of a static var compensator in an experimental IEEE 14-bus system; the voltage drop in different buses in an IEEE 14-bus system is calculated by the standard formula. The total voltage drop in the network (TVDN) is also calculated as a reference. The ranking of buses in order of decreasing voltage drop is made, and the weak buses are identified as those showing the maximum or near-maximum voltage drop for the installation of a Static Var Compensator (SVC). The optimum usable size is calculated using a Genetic Algorithm approach to optimize the installation cost. After size optimization, installing a 2 MW solar generator is considered for the weak and most potential bus, which suffers from voltage drops or power loss. Based on the generator at the weakest bus, the total power loss in the network is calculated and compared with a similar method to assess the efficiency of the proposed model. Thus, the voltage stability enhancement problem is solved by applying a Genetic algorithm (GA) to optimize SVC size and using the Total Voltage Drop in Network (TVDN) method to identify weak buses in the systems. It is found that the performance of the proposed system is comparable with another existing system. It is further observed that a gain in power loss to 6.56% is achievable by adopting the proposed strategy, and the gain is better than the other system.

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Kallon, Mohamed Amidu, George Nyauma Nyakoe y Christopher Maina Muriithi. "Development of DSTATCOM Optimal Sizing and Location Technique Based on IA-GA for Power Loss Reduction and Voltage Profile Enhancement in an RDN". International Journal of Electrical and Electronics Research 9, n.º 4 (30 de diciembre de 2021): 96–106. http://dx.doi.org/10.37391/ijeer.090402.

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The efficiency of electrical distribution systems is being more affected by the increase in voltage drops and power losses. These issues of voltage drop and power loss can be significantly minimized by the incorporation of a Distribution Static Compensator (DSTATCOM) in the distribution network. However, inappropriate positioning and sizing of DSTATCOM can undermine its efficiency. Despite the contributions of many researchers to the optimal placement of DSTATCOM and other compensators in distribution networks, the problems of voltage drop, power losses, and power quality persist, necessitating the need for additional research in this area. In this paper, an innovative technique based on hybridized Immune and Genetic Algorithm (IA-GA) for optimal DSTATCOM placement and sizing for three distinct load levels is proposed. Simulation and analysis of the proposed algorithm were carried out using IEEE-33 bus radial distribution network (RDN) in MATLAB. The simulation results demonstrate a substantial decrease in power loss and a significant improvement in the voltage profile. Evaluation of the proposed method against existing techniques reveals that the proposed technique outperforms IA and PSO in terms of decreasing power loss and enhancement of voltage profiles. A cost-benefit analysis was performed, and it was discovered that the proposed technique yields improved annual cost savings.

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Maciążek, M., D. Grabowski y M. Pasko. "Active power filters – optimization of sizing and placement". Bulletin of the Polish Academy of Sciences: Technical Sciences 61, n.º 4 (1 de diciembre de 2013): 847–53. http://dx.doi.org/10.2478/bpasts-2013-0091.

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Abstract The significant problem of compensator placement and sizing in electrical networks has been analyzed in the paper. The compensation is usually realized by means of passive or active power filters. The former solution is widely used mainly because of the economical reasons, but the latter one becomes more and more popular as the number of nonlinear loads increases. Regardless of the compensator type the most important goal consists in voltage and current distortion drop below levels imposed by standards. Nevertheless, the desired effects should be achieved with the minimum cost. So far a few objective functions have been proposed for this optimization problem. It is claimed that minimization of the compensator currents leads also to the minimum costs. This paper shows that such simplified approach could lead to suboptimal solutions and in fact a function g(·) reflecting the relation between the compensator size and its price must be incorporated into objective functions. Moreover, in this case it is very easy to compare solutions obtained using compensators offered by different suppliers - it is enough to change the function g(·). Theoretical considerations have been illustrated by an example of active power filter allocation and sizing.

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Kikusato, Hiroshi, Naoyuki Takahashi, Jun Yoshinaga, Yu Fujimoto, Yasuhiro Hayashi, Shinichi Kusagawa y Noriyuki Motegi. "Method for Determining Line Drop Compensator Control Parameters of Low-Voltage Regulator Using Random Forest". Applied Mechanics and Materials 799-800 (octubre de 2015): 1299–305. http://dx.doi.org/10.4028/www.scientific.net/amm.799-800.1299.

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Compensation of a voltage within the appropriate range becomes difficult when a large number of photovoltaic (PV) systems are installed. As a solution to this problem, the installation of a low-voltage regulator (LVR) has been studied. In this paper, we propose a method for instantly and accurately determining the line drop compensator (LDC) method parameters as a part of a voltage management scheme, which consists of prediction, operation, and control. In the proposed method, the solution candidates of the proper LDC parameters are narrowed by using a random forest that learns the relationship between the power-series data and the properness of the LDC parameters, thereby reducing the computational cost. We performed numerical simulations to verify the validity of the proposed method. From the results, the LDC parameters can be rapidly and accurately determined. Additionally, the desirable voltage control performance is verified.

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Noman, M. A. y Fahad A. AL-Zahrani. "SELF GENERATED DC LINK – VOLTAGE SOURCE INVERTER AS VOLTAGE DROP COMPENSATOR FOR POWER TRANSMISSION LINES". JES. Journal of Engineering Sciences 36, n.º 3 (1 de mayo de 2008): 711–20. http://dx.doi.org/10.21608/jesaun.2008.116161.

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Alatshan, Mohammed Salheen, Ibrahim Alhamrouni, Tole Sutikno y Awang Jusoh. "Improvement of the performance of STATCOM in terms of voltage profile using ANN controller". International Journal of Power Electronics and Drive Systems (IJPEDS) 11, n.º 4 (1 de diciembre de 2020): 1966. http://dx.doi.org/10.11591/ijpeds.v11.i4.pp1966-1978.

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The electronic equipments are extremely sensitive to variation in electric supply. The increasing of a nonlinear system with several interconnected unpredicted and non-linear loads are causing some problems to the power system. The major problem facing the power system is power quality, controlling of reactive power and voltage drop. A static synchronous compensator (STATCOM) is an important device commonly used for compensation purposes, it can provide reactive support to a bus to compensate voltage level. In this paper, the Artificial Neural Network (ANN) controlled STATCOM has been designed to replace the conventional PI controller to enhance the STATCOM performance. The ANN controller is proposed due to its simple structure, adaptability, robustness, considering the power grid non linearities. The ANN is trained offline using data from the PI controller. The performance of STATCOM with case of Load increasing and three-phase faults case was analyzed using MATLAB/Simulink software on the IEEE 14-bus system. The comprehensive result of the PI and ANN controllers has demonstrated the effectiveness of the proposed ANN controller in enhancing the STATCOM performance for Voltage profile at different operating conditions. Furthermore, it has produced better results than the conventional PI controller.

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Mukhopadhyay, Bineeta, Rajib Kumar Mandal y Girish Kumar Choudhary. "Voltage Compensation In Wind Power System Using STATCOM Controlled By Soft Computing Techniques". International Journal of Electrical and Computer Engineering (IJECE) 7, n.º 2 (1 de abril de 2017): 667. http://dx.doi.org/10.11591/ijece.v7i2.pp667-680.

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<span lang="EN-US">When severe voltage sags occur in weak power systems associated with grid-connected wind farms employing doubly fed induction generators, voltage instability occurs which may lead to forced disconnection of wind turbine. Shunt flexible AC transmission system devices like static synchronous compensator (STATCOM) may be harnessed to provide voltage support by dynamic injection of reactive power. In this work, the STATCOM provided voltage compensation at the point of common coupling in five test cases, namely, simultaneous occurrence of step change (drop) in wind speed and dip in grid voltage, single line to ground, line to line, double line to ground faults and sudden increment in load by more than a thousand times. Three techniques were employed to control the STATCOM, namely, fuzzy logic, particle swarm optimization and a combination of both. A performance comparison was made among the three soft computing techniques used to control the STATCOM on the basis of the amount of voltage compensation offered at the point of common coupling. The simulations were done with the help of SimPowerSystems available with MATLAB / SIMULINK and the results validated that the STATCOM controlled by all the three techniques offered voltage compensation in all the cases considered.</span>

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Kawahara, Keiji, Yoshifumi Mochinaga, Yasuji Hisamizu, Takashi Inoue y Toshiaki Matsuura. "Compensation of Voltage Drop using Static Var Compensator at Sectioning Post for Shinkansen Power Feeding System". IEEJ Transactions on Industry Applications 119, n.º 4 (1999): 523–29. http://dx.doi.org/10.1541/ieejias.119.523.

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Tesis sobre el tema "Voltage drop compensator"

Heydari, Elaheh. "Design and control of a new pulsating power decoupling circuit for grid-connected photovoltaic systems". Electronic Thesis or Diss., université Paris-Saclay, 2022. http://www.theses.fr/2022UPAST004.

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Aujourd'hui, les systèmes photovoltaïques connectés au réseau sont de plus en plus utilisés parmi les systèmes à énergies renouvelables. L’élément clé du système de conversion de puissance est le convertisseur statique connecté au réseau. Pour les applications de faible puissance, le convertisseur monophasé est le meilleur compromis. Les structures de conversion mono-étage permettent d’avoir un rendement plus élevé ainsi qu'un coût et une taille réduits. Cependant, dans des conditions de faible irradiation la tension PV chute, ce qui entraîne l'arrêt de l'onduleur et la perte totale de puissance injectée. Par conséquent, les systèmes à un étage de conversion souffrent d'une plage de fonctionnement réduite. Dans ce travail, nous proposons des solutions pour améliorer le rendement et la fiabilité des systèmes mono-étage connectés au réseau. Pour cela, dans la première partie, un contrôleur basé sur le mode glissant terminal rapide est combiné à un contrôle direct de la puissance. Il est associé à un algorithme de suivi du point de puissance maximale. Les simulations et les résultats expérimentaux sur un banc d'essai de 1kW montrent l'efficacité de la proposition en termes de performance dynamique, de faible distorsion harmonique totale et de robustesse aux variations d'irradiance. Les systèmes mono-étage sont également confrontés à une ondulation de puissance sur le bus continu à la fréquence double de celle du réseau. Ces ondulations de puissance sont néfastes à la durée de vie des panneaux solaires. Ainsi, la deuxième partie de ce travail propose de développer un dispositif qui simultanément réduit les ondulations de puissance et compense la chute de tension. Le dispositif est constitué de deux convertisseurs statiques : un flyback à faible puissance et un pont complet (H-bridge). Le compensateur hybride augmente la plage de fonctionnement de l'onduleur, empêchant son arrêt. Il contribue aussi à augmenter la fiabilité du système. Un banc expérimental de 1kW a été dimensionné et réalisé. Il a permis d’évaluer le dispositif sur plusieurs points de fonctionnement. Les résultats en régime permanent montrent que le compensateur hybride peut simultanément réaliser une atténuation de 85% des ondulations de puissance et une compensation de 20% de la chute de tension. Le dispositif a également de bonnes performances en régime transitoire. Dans la troisième partie de ce travail, la surveillance des modules PV est abordée afin d'augmenter la fiabilité. La méthode proposée est basée sur la spectroscopie d'impédance. Elle ne nécessite pas d’équipement supplémentaire car elle utilise le circuit qui permet d’atténuer les ondulations de puissance. De plus elle ne nécessite pas d'interrompre la production d'électricité. Les résultats de simulation, à l'aide de MATLAB-Simulink®, montrent une réduction de plus de 80% de l'amplitude des ondulations de la tension aux bornes des modules PV. Les résultats montrent que la spectroscopie d'impédance permet d’estimer les paramètres de l'impédance du module PV avec une erreur relative inférieure à 5%. L’évolution de ces paramètres en cours de fonctionnement devrait permettre de surveiller l’état de santé du panneau
Today, grid-connected photovoltaic systems are becoming an increasingly important part of renewable energy. The power conversion system's heart is the grid-connected interface converter based on power electronics. The single-phase inverter is the best compromise for low power applications as an interface for power conversion. Single-stage systems offer higher efficiency and lower cost and size. However, the PV voltage drops under low irradiance conditions, leading to inverter shut down and the total injected power loss.As a consequence, single-stage systems suffer from a low operating range. This work addresses the critical issues of the single-stage single-phase grid-connected PV system, including reliability and efficiency. A fast terminal sliding mode combined with direct power control is proposed in the first part. It is associated with a maximum power point tracking algorithm with power output. Simulations and experimental results on a 1kW test bench show the proposal's effectiveness in terms of dynamic performance, low total harmonic distortion and robustness to irradiance variations. Single-phase power systems also face pulsating power at twice the mains frequency on the DC bus. This pulsating power should not be transferred to the PV side as it reduces the efficiency of the solar panel. Thus, the second part of this work proposes a dual-function decoupling circuit: it mitigates pulsating power and compensates for the voltage drop. Thanks to the following additional power converters, these objectives are fulfilled: a low power flyback and an H-bridge. The hybrid compensator increases the inverter's operating range, prevents its shutdown, and increases the system reliability. A 1kW experimental bench has been designed to evaluate the proposal for several operating points. The steady-state results show that the hybrid compensator can simultaneously achieve 85% compensation of the pulsating power and 20% compensation of the voltage drop. The circuit also shows good transient responses. In the third part of this work, monitoring and fault diagnosis of PV modules are addressed to increase system reliability, efficiency, and safety. The proposed fault diagnosis method is based on online PV impedance spectroscopy without additional equipment. It does not require interrupting the power production and uses the pulsating power decoupling circuit as an impedance spectroscopy tool. The simulation results, using MATLAB-Simulink®, show a reduction of more than 80% ripples amplitude of the PV modules terminal voltage. The results also show that impedance spectroscopy can estimate the PV module impedance parameters with a lower than 5% relative error. The evolution of these parameters during operation should make it possible to monitor the health of the panel

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Gaeb, Jassim Abdulah. "Control of reactive compensation on transmission systems". Thesis, University of Bradford, 1989. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.236704.

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Milliken, Robert Jon. "A capacitor-less low drop-out voltage regulator with fast transient response". Texas A&M University, 2005. http://hdl.handle.net/1969.1/3275.

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Power management has had an ever increasing role in the present electronic industry. Battery powered and handheld applications require power management techniques to extend the life of the battery and consequently the operation life of the device. Most systems incorporate several voltage regulators which supply various subsystems and provide isolation among such subsystems. Low dropout (LDO) voltage regulators are generally used to supply low voltage, low noise analog circuitry. Each LDO regulator demands a large external capacitor, in the range of a few microfarads, to perform. These external capacitors occupy valuable board space, increase the IC pin count, and prohibit system-on-chip (SoC) solutions. The presented research provides a solution to the present bulky external capacitor LDO voltage regulators with a capacitor-less LDO architecture. The large external capacitor was completely removed and replaced with a reasonable 100pF internal output capacitor, allowing for greater power system integration for SoC applications. A new compensation scheme is presented that provides both a fast transient response and full range ac stability from a 0mA to 50mA load current. A 50mA, 2.8V, capacitor-less LDO voltage regulator was fabricated in a TSMC 0.35um CMOS technology, consuming only 65uA of ground current with a dropout voltage of 200mV. Experimental results show that the proposed capacitor-less LDO voltage regulator exceeds the current published works in both transient response and ac stability. The architecture is also less sensitive to process variation and loading conditions. Thus, the presented capacitor-less LDO voltage regulator is suitable for SoC solutions.

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Johari, Pritesh N. "Distributed Decap-Padded Standard Cell based On-Chip Voltage Drop Compensation Framework". University of Cincinnati / OhioLINK, 2009. http://rave.ohiolink.edu/etdc/view?acc_num=ucin1235504983.

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Hsiang-FengYu y 余祥鳳. "IC Design for Flyback Converter with Output-Voltage-Drop Compensation Using Primary-Side Feedback Control". Thesis, 2015. http://ndltd.ncl.edu.tw/handle/ay4vq5.

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Capítulos de libros sobre el tema "Voltage drop compensator"

Canacsinh, H., José Fernando Silva, Sónia F. Pinto y Luis M. Redondo. "Solid-State Bipolar Marx Generator with Voltage Droop Compensation". En Technological Innovation for Value Creation, 411–18. Berlin, Heidelberg: Springer Berlin Heidelberg, 2012. http://dx.doi.org/10.1007/978-3-642-28255-3_45.

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Mebrahtu, Fsaha. "Voltage Drop Mitigation in Smart Distribution Network". En Handbook of Research on New Solutions and Technologies in Electrical Distribution Networks, 64–77. IGI Global, 2020. http://dx.doi.org/10.4018/978-1-7998-1230-2.ch004.

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Voltage dip in the distribution network is caused by disturbance at different voltage levels and experienced by low voltage customers are established. Voltage dips are those disturbances which damage the power quality of the distribution network and causing heavy economic damage to the customers. This chapter investigates procedures of mitigating the voltage dip by reducing the number of faults due to short circuits, lowering the fault clearing time, and changing the power system design and DSTATCOM Compensator with DG and dynamic voltage restorer.

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Xie, Yunxi y Li Chen. "Research and Design of a Precision Current Source Based on ARM". En Advances in Transdisciplinary Engineering. IOS Press, 2024. http://dx.doi.org/10.3233/atde231129.

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Because the voltage is affected by the load of the component and the resistance of the field harness, there is a voltage drop loss, resulting in inaccurate terminal data. Measurement and control generally need to measure all kinds of non-electrical physical quantities, such as temperature, pressure, speed, Angle, etc., need to be converted into analog current signals to be transmitted to the control room or display equipment hundreds of meters away, the most widely used in industry is to use 4 ∼ 20mA current to transmit analog quantities. However, in engineering use, such as the outgoing signal used by sensors and the ADC acquisition signal need accurate current signals. In order to solve the problem of precision current source output, a precision 4∼20mA signal output is designed. An ARM-based MCU system is designed to generate an adjustable duty cycle combined GP8301 current chip. The inverse current channel parameters and PWM channel parameters are designed by using fitting algorithm and compensation algorithm. The algorithm is designed by Matlab to generate the parameters of the fitting curve, and the parameters are determined based on the principle of minimum variance. The design accuracy of the current source is one thousandth of the range, and the minimum resolution is 0.02mA. Compared with the current output value of the direct chip, the accuracy is higher, the accuracy is higher, and the linearity of each segment is better.

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Actas de conferencias sobre el tema "Voltage drop compensator"

Kikusato, Hiroshi, Naoyuki Takahashi, Jun Yoshinaga, Yu Fujimoto, Yasuhiro Hayashi, Shinichi Kusagawa y Noriyuki Motegi. "Method for determining line drop compensator parameters of low voltage regulator using support vector machine". En 2014 IEEE Power & Energy Society Innovative Smart Grid Technologies Conference (ISGT). IEEE, 2014. http://dx.doi.org/10.1109/isgt.2014.6816413.

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Kikusato, Hiroshi, Naoyuki Takahashi, Jun Yoshinaga, Yu Fujimoto, Yasuhiro Hayashi, Shinichi Kusagawa y Noriyuki Motegi. "Method for instantly determining line drop compensator parameters of low-voltage regulator using multiple classifiers". En 2014 IEEE PES Innovative Smart Grid Technologies Conference Europe (ISGT-Europe). IEEE, 2014. http://dx.doi.org/10.1109/isgteurope.2014.7028851.

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Muttaqi, K. M., A. D. T. Le, M. Negnevitsky y G. Ledwich. "A novel tuning method for advanced line drop compensator and its application to response coordination of distributed generation with voltage regulating devices". En 2014 IEEE Industry Applications Society Annual Meeting. IEEE, 2014. http://dx.doi.org/10.1109/ias.2014.6978411.

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Philpott, Gerard y Bill Lockley. "Static Var Compensators to Stabilize Voltages in Weak Power Systems". En 2000 3rd International Pipeline Conference. American Society of Mechanical Engineers, 2000. http://dx.doi.org/10.1115/ipc2000-250.

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Large horsepower motors on weak power systems cause problems associated with excessive voltage drops. The voltage drops may be steady state caused by heavy system loading or they may be transient caused by starting a large motor. One way to solve the problems is to use a Static Var Compensator (SVC) on the power system, to compensate for the reactive loads and stabilize the voltage on the utility and in the station. SVCs have been used for years by electric utilities and are now being used for some industrial applications. This paper gives an overview of the technology and describes a pipeline application.

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Su, Tai-Chi, Jen-Yi Hsu y Paul C. P. Chao. "Design and Implementation for the High Efficiency Hardware Accelerator Applied to the Compensation of IR Drop on AMOLED Panel". En ASME 2023 32nd Conference on Information Storage and Processing Systems. American Society of Mechanical Engineers, 2023. http://dx.doi.org/10.1115/isps2023-110515.

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Abstract This work proposes an external real-time compensation method based on a look-up table to compensate for the IR drop. With the trend of 3C products increasing screen size and resolution, the decline of panel uniformity has become a problem that must be solved. In this work, the matrix is established with the equivalent circuit model of the panel. The voltage drop of different brightness is calculated iteratively according to the electrical properties of TFT and OLED to correct the preset Vdatas of the original brightness and store it in the look-up table. The uniformity after compensation is verified by 9 points. Experimental results show that IR Drop prediction error controlled within 3.8%, and the uniformity after compensation reached 99.647%.

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Genser, Andreas, Christian Bachmann, Christian Steger, Reinhold Weiss y Josef Haid. "Supply voltage emulation platform for DVFS voltage drop compensation explorations". En Software (ISPASS). IEEE, 2011. http://dx.doi.org/10.1109/ispass.2011.5762727.

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Leitermann, O., V. Martinelli, L. Molske y J. Simonelli. "Fast line drop compensation in low voltage regulators". En CIRED Workshop 2016. Institution of Engineering and Technology, 2016. http://dx.doi.org/10.1049/cp.2016.0723.

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Richardson, Bob y Tudor Pike. "Pulse Droop Compensation using a PWM Technique". En 2008 IEEE International Power Modulators and High Voltage Conference (IPMC). IEEE, 2008. http://dx.doi.org/10.1109/ipmc.2008.4743620.

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Malavasi-Mora, Andres y Renato Rimolo-Donadio. "Voltage Drop Mitigation by Adaptive Voltage Scaling using Clock-Data Compensation". En 2020 IEEE 11th Latin American Symposium on Circuits & Systems (LASCAS). IEEE, 2020. http://dx.doi.org/10.1109/lascas45839.2020.9069016.

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Cassel, R. L. "Pulsed Voltage Droop Compensation for Solid State Marx Modulator". En 2008 IEEE International Power Modulators and High Voltage Conference. IEEE, 2008. http://dx.doi.org/10.1109/ipmc.2008.4743593.

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