Journal articles: 'Power Quality in DC'

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Barros, Julio, Matilde de Apráiz, and Ramón Diego. "Power Quality in DC Distribution Networks." Energies 12, no. 5 (March 5, 2019): 848. http://dx.doi.org/10.3390/en12050848.

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This paper presents an overview of power quality in low-voltage DC distribution networks. We study which of the power quality disturbances in AC networks are also relevant in DC networks, as well as other disturbances specific to DC networks. The paper reviews the current status of international regulations in this topic and proposes different indices for the detection and characterization of the main types of power quality disturbances, presenting some results obtained in different laboratory tests in DC networks using different DC voltage shapes delivered by different DC power source types.

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Mariscotti, Andrea. "Power quality metrics for DC grids with pulsed power loads." ACTA IMEKO 10, no. 2 (June 29, 2021): 153. http://dx.doi.org/10.21014/acta_imeko.v10i2.1065.

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DC grids can effectively feed pulsed power loads (PPLs), integrating local energy storage to minimize the impact on other connected loads and implementing buffered sub-grids to isolate susceptible loads even more. The identification of regulatory limits for PPL integration and DC grid response and the assessment of PPL impact necessitate suitable Power Quality (PQ) metrics. Existing indexes and limits (e.g. ripple and distortion, voltage fluctuation) are compared to other metrics, derived from control methods and knowledge of the peculiar characteristics of PPL and interaction with DC grids in some examples. The objective is a unified approach for PQ metrics suitable for a wide range of DC grids and in particular to the behavior of PPLs.

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Whaite, Stephen, Brandon Grainger, and Alexis Kwasinski. "Power Quality in DC Power Distribution Systems and Microgrids." Energies 8, no. 5 (May 15, 2015): 4378–99. http://dx.doi.org/10.3390/en8054378.

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Chen, Jun-Hao, Kuang-Hsiung Tan, and Yih-Der Lee. "Intelligent Controlled DSTATCOM for Power Quality Enhancement." Energies 15, no. 11 (May 30, 2022): 4017. http://dx.doi.org/10.3390/en15114017.

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In this study, a three-phase four-wire distribution static compensator (DSTATCOM) is proposed to improve power quality, including the compensation of the three-phase unbalanced grid currents, the total harmonic distortion (THD) reduction of the grid current, and the power factor (PF) correction. Moreover, when different types of loads vary in the power system, the instantaneous power follows into or out of the DC-link capacitor in the DSTATCOM and results in poor transient responses of the grid current and DC-link voltage and performance deterioration. Hence, the DC-link voltage control plays a significant part in the DSTATCOM under load variation. For the purpose of mending the transient responses of the grid currents and DC-link voltage control and the performance of the DSTATCOM, the conventional proportional-integral (PI) controller is substituted with a novel online trained wavelet Takagi-Sugeno-Kang fuzzy neural network (WTSKFNN) controller in this study. Furthermore, the network structure and the online learning method of the proposed WTSKFNN controller are described in detail. Finally, the experimental results are given to certify the feasibility and effectiveness of the DSTATCOM using the proposed WTSKFNN controller for the power quality enhancement and the DC-link control improvement under load variation.

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Vasudevan, K., and M. Balasingh Moses. "Renewable Energy Resources based DC-DC Power Converter for Micro Grid Power Quality Analysis." Asian Journal of Research in Social Sciences and Humanities 6, no. 9 (2016): 1509. http://dx.doi.org/10.5958/2249-7315.2016.00886.8.

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Singh, Shihka, Bhim Singh, G. Bhuvaneswari, and Vashist Bist. "Power Quality Improvement in Bridgeless Ac–Dc Converter Based Multi-output Switched Mode Power Supply." International Journal of Emerging Electric Power Systems 15, no. 6 (December 1, 2014): 533–44. http://dx.doi.org/10.1515/ijeeps-2014-0124.

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Abstract Computer power supplies are required to have multiple isolated regulated dc voltages with low ripple content and high input power factor at the utility interface. A dc–dc converter is used for obtaining these isolated multi-output dc voltages with excellent regulation. In this paper, a non-isolated ac–dc converter is proposed as the first stage converter to obtain a regulated dc output rather than using a simple uncontrolled diode bridge rectifier at the front end. A dc–dc converter is used at the second stage that has a high frequency transformer with multiple secondary windings to obtain different dc voltage levels at the output. The proposed bridgeless converter based power supply is designed using fundamental design equations, and different component values are calculated. Extensive simulations are carried out to demonstrate the improved performance of the proposed bridgeless converter based multi-output computer power supply at varying source voltages and load conditions. Experimental validation of the power supply is carried on a developed hardware prototype, and the test results are compared with the simulated performance for design verification.

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Sadikin, Muhammad, Tomonobu Senjyu, and Atsushi Yona. "DC–DC Type High-Frequency Link DC for Improved Power Quality of Cascaded Multilevel Inverter." International Journal of Emerging Electric Power Systems 14, no. 4 (June 28, 2013): 333–40. http://dx.doi.org/10.1515/ijeeps-2012-0007.

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Abstract Multilevel inverters are emerging as a new breed of power converter options for power system applications. Recent advances in power switching devices enabled the suitability of multilevel inverters for high voltage and high power applications because they are connecting several devices in series without the need of component matching. Usually, a transformerless battery energy storage system, based on a cascaded multilevel inverter, is used as a measure for voltage and frequency deviations. System can be reduced in size, weight, and cost of energy storage system. High-frequency link circuit topology is advantageous in realizing compact and light-weight power converters for uninterruptible power supply systems, new energy systems using photovoltaic-cells, fuel-cells and so on. This paper presents a DC–DC type high-frequency link DC (HFLDC) cascaded multilevel inverter. Each converter cell is implemented a control strategy for two H-bridge inverters that are controlled with the same multicarrier pulse width modulation (PWM) technique. The proposed cascaded multilevel inverter generates lower voltage total harmonic distortion (THD) in comparison with conventional cascaded multilevel inverter. Digital simulations are carried out using PSCAD/EMTDC to validate the performance of the proposed cascaded multilevel inverter.

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Bialobrzheskyi, O., I. Reva, S. Yakimets, and A. Sulym. "The electrical power quality indicator – interference power factor." Naukovyi Visnyk Natsionalnoho Hirnychoho Universytetu, no. 4 (August 30, 2022): 71–77. http://dx.doi.org/10.33271/nvngu/2022-4/071.

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Purpose. Substantiation of the methodology for calculating an indicator characterizing the pulsating current power distortion. Methodology. When analyzing the power of direct and alternating sinusoidal currents, the features of the ratio of a root-mean-square norm to its mean value, known as the invariance power factor, are noted. In this case, the root-mean-square power value acts as a normalizing parameter. Using a combination of direct and sinusoidal (pulsating) current, the dependences of the invariance power factor on the ratio of direct and alternating components are obtained. Findings. Taking into account the interaction of the current and voltage components of different frequencies, the corresponding power component is highlighted, called interference power. With its use, by analogy with the invariance power factor, the interference power factor is introduced. The interference power factor behavior for AC non-sinusoidal current circuit and DC pulsed current circuit of rectifier was investigated, as a result of which a difference was established in the interference power factor dependence in these circuits. Originality. The obtained dependences of the interfere power factor on the ratio of DC and AC components for current and voltage prove the versatility of its application for assessing power distortion in both DC and AC circuits, as proved by the example of a circuit with a single-phase controlled rectifier. Practical value. The results obtained can be used to assess the electrical power distortion level in electric complexes and systems of various kinds of current and kind of energy, including when it is taken into account. This is a prerequisite for the measures development to improve the electricity quality.

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Abdelkader, Abdallah Ben, Othmane Abdelkhalek, Youssef Mouloudi, Mohamed Amine Hartani, and Benabid Slimane. "Series active power filter supplied by fuel cell for mitigating power quality issues." International Journal of Applied Power Engineering (IJAPE) 9, no. 2 (August 1, 2020): 173. http://dx.doi.org/10.11591/ijape.v9.i2.pp173-192.

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<div data-canvas-width="174.49288953839948">In this paper, the combination of the series active power filter (SAPF) with a fuel cell (FC) source is deliberated. The FC based on the SAPF aims to compensate voltage deviations or disturbances that occur in the system caused by power quality issues. The proposed system consists of a fuel cell source connected to the DC l ink through two DC-DC converters, the first extracts the maximum power of the FC source through pulse width modulation (PWM) signals generated from the maximum power point tracker (MPPT) controller. Thus, the second converter is used to regulate the high voltage side of the converter through closed control loops, in addition to a voltage source inverter (VSI) and a series injection transformer. Despite of fluctuations of the DC link during the compensation of the needed energy, MPPT and closed control loops generate PWM signals to the switching devices of DC-DC boost converters in order to extract maximum fuel cell power and to maintain the bus voltage within its limits and around its reference values respectively. The proposed topology is simulated in MATLAB/Simulink software, where simulation results show that the proposed FC based SAPF can efficiently reduce problems of voltage sags-wells and harmonics.</div>

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Wang, Y. J., and C. L. Chen. "Power quality issues in the TRTS DC railway power networks." European Transactions on Electrical Power 13, no. 5 (September 2003): 307–14. http://dx.doi.org/10.1002/etep.4450130506.

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Mishra, Debani Prasad, Kshirod Kumar Rout, Sivkumar Mishra, Mandakurit Nivas, Rambilli Krishna Prasad Rao Naidu, and Surender Reddy Salkuti. "Power quality enhancement of grid-connected PV system." International Journal of Power Electronics and Drive Systems (IJPEDS) 14, no. 1 (March 1, 2023): 369. http://dx.doi.org/10.11591/ijpeds.v14.i1.pp369-377.

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Solar photovoltaic (PV) power, for its multiple benefits, has adhered to prominent consideration in the electrical energy generation region. The double-stage triple-phase grid-connected solar PV (SPV) system is utilized to enhance the power quality by employing a lymphoblastoid cell lines LCL filter. In this method, a DC-DC converter and DC-AC converter make a feasible juncture of the PV systems to the electrical interface. For converting boosted DC into AC, A 3-phase DC-AC converter is used, which is supplied into the grid. A 3-phase voltage converter is employed in place of an inverter for interfacing amid the voltage generated by the PV system and the grid possessing an AC transmission line. An maximum power point tracking (MPPT) application is used in this proposal to amplify the effectiveness of the PV array in face of any unsteady climatic circumstances. Hence, the highest energy could be secured out of the solar PV array and interfaced with the grid. Enhancing power quality by employing an LCL filter is quantified by FFT analysis in MATLAB. The advised proposal has attained a very low total harmonic distortion (THD), proving its efficacy. Also, the outcomes ascertain the applications of the proposed system and extend future advances of renewable energy with a great power quality improvement.

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Guan, Shangshu, Yidan Song, and Shun Tao. "Analysis of power quality problems in DC distribution network." Journal of Physics: Conference Series 2221, no. 1 (May 1, 2022): 012028. http://dx.doi.org/10.1088/1742-6596/2221/1/012028.

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Abstract With the application and popularization of distributed power supply and power electronic equipment in power grid, AC distribution is faced with problems such as low efficiency and low power quality. At the same time, due to the advantages of large power supply capacity, long power supply radius, high efficiency, good controllability and adaptability to renewable energy access, DC power distribution has become a crucial development direction of the future distribution system. Reasonable and systematic analysis of power quality problems of DC distribution network plays an important role in its construction and application. Firstly, this paper introduces the background, significance and status of the research on DC distribution network and its power quality. Then introduces the three main topology of DC distribution network structure and connection mode. After selecting pseudo bipolar structure to build the simulation circuit, the power quality phenomena such as voltage sag are simulated and analyzed by PSCAD. The results obtained are consistent with theoretical analysis.

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VIJAYAKUMAR, M., and S. VIJAYAN. "THREE-PHASE FOUR-WIRE PV-BASED SERIES HYBRID ACTIVE POWER FILTER FOR POWER QUALITY IMPROVEMENT." Journal of Circuits, Systems and Computers 23, no. 10 (October 14, 2014): 1450144. http://dx.doi.org/10.1142/s0218126614501448.

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This paper proposes a photovoltaic (PV)-based three-phase four-wire (3P4W) series hybrid active power filter (SHAPF) it comprises of a series active power filter (SAPF) and an LC shunt passive filter. The proposed system eliminates both the current and voltage harmonics and compensates reactive power, neutral current and voltage interruption. A SAPF demands a source of energy for compensating the voltage sag/swell. This system introduces a new topology for SHAPF utilizes the PV with DC–DC boost converter as a source of DC power for SAPF. The compensation current reference evaluation is based on the twin formulation of the vectorial theory of electrical power theorem with fuzzy logic controller (FLC). The PV array/battery managed DC–DC boost converter is employed to step up the voltage to meet the DC bus voltage requirement of the three-leg voltage source inverter (VSI). The foremost benefit of the proposed system is that, it will provide uninterrupted compensation for the whole day. This system utilizes the renewable energy accordingly saves the energy and shares the load during the solar irradiation available. The simulation and experimental studies are carried out to validate the effectiveness of the proposed PV-SHAPF.

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Prakash, Vodapalli, C. Venkatesh, and C. Pavan Kumar. "Hybrid UPQC arrangement for power quality improvement." E3S Web of Conferences 309 (2021): 01143. http://dx.doi.org/10.1051/e3sconf/202130901143.

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In the forthcoming gap, throughout the world storage systems will carry the leading role, the reason is of providing energy in distant places. The utilization of storage elements in almost all applications are tremendously changed by the researchers. Here, mentioning the theory to increase the quality benefits in all corners of power utilization. By summing potential elements such as Unified power Quality conditioner, fuel cell to suppress the problems at the consumer points. UPQC is capable to supporting dynamic conditions at combined common connection in the system. To achieve the consumer expectations in our country, Power Quality is a big subject as there are frequent power variations, outages and frequency. Hence, it is required to take crucial steps in the direction of the growth. This hybridization of different elements gives the research in the angle of improving several issues, for unbalanced distribution system. This paper comes up with a configuration of UPQC that incorporates DC –to-DC converter along with the fuel - cell at the DC-link side, the whole setup run under MATLAB environment.

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P, Loganathan. "Integration of Battery Energy Storage System with PV by Using Bidirectional DC-DC Converter for Improve Power Quality." Journal of Advanced Research in Dynamical and Control Systems 12, SP7 (July 25, 2020): 905–11. http://dx.doi.org/10.5373/jardcs/v12sp7/20202181.

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Eyenubo, OJ, and P. Oshevire. "IMPROVEMENT OF POWER SYSTEM QUALITY USING VSC-BASED HVDC TRANSMISSION." Nigerian Journal of Technology 36, no. 3 (June 30, 2017): 889–96. http://dx.doi.org/10.4314/njt.v36i3.31.

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The HVDC technology can be represented by the combination of a Direct Current (DC) circuit with two power electronics converters, each one at a link terminal, for AC/DC and DC/AC conversion The principal characteristic of VSC-HVDC transmission is its ability to independently control the reactive and real power flow at each of the AC systems via the Point of Common Coupling (PCC). The active and reactive power is related to the power angle and the magnitude ofÂ voltage in the reference -frame selected such that the quadrature component will result in the ratio between the maximum fundamental peak phase voltage and the DC total voltagehttp://dx.doi.org/10.4314/njt.v36i3.31

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Cottingham, John DeWitte, William Bassett, and George Melendez. "Aircraft DC Power Quality Characteristics of a PCTRU." SAE International Journal of Aerospace 1, no. 1 (November 11, 2008): 1000–1006. http://dx.doi.org/10.4271/2008-01-2890.

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Barsoum, N. N. "Implementation of a Higher Quality dc Power Converter." Journal of Electromagnetic Analysis and Applications 02, no. 02 (2010): 82–90. http://dx.doi.org/10.4236/jemaa.2010.22012.

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Bhat, Abdul Hamid, and Pramod Agarwal. "Three-phase, power quality improvement ac/dc converters." Electric Power Systems Research 78, no. 2 (February 2008): 276–89. http://dx.doi.org/10.1016/j.epsr.2007.02.002.

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Dharmalingam, Rajasekaran, Subhransu Sekhar Dash, Karthikrajan Senthilnathan, Arun Bhaskar Mayilvaganan, and Subramani Chinnamuthu. "Power Quality Improvement by Unified Power Quality Conditioner Based on CSC Topology Using Synchronous Reference Frame Theory." Scientific World Journal 2014 (2014): 1–7. http://dx.doi.org/10.1155/2014/391975.

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This paper deals with the performance of unified power quality conditioner (UPQC) based on current source converter (CSC) topology. UPQC is used to mitigate the power quality problems like harmonics and sag. The shunt and series active filter performs the simultaneous elimination of current and voltage problems. The power fed is linked through common DC link and maintains constant real power exchange. The DC link is connected through the reactor. The real power supply is given by the photovoltaic system for the compensation of power quality problems. The reference current and voltage generation for shunt and series converter is based on phase locked loop and synchronous reference frame theory. The proposed UPQC-CSC design has superior performance for mitigating the power quality problems.

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Cristiano, Rony, Daniel J. Pagano, Luis Benadero, and Enrique Ponce. "Bifurcation Analysis of a DC–DC Bidirectional Power Converter Operating with Constant Power Loads." International Journal of Bifurcation and Chaos 26, no. 04 (April 2016): 1630010. http://dx.doi.org/10.1142/s021812741630010x.

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Direct current (DC) microgrids (MGs) are an emergent option to satisfy new demands for power quality and integration of renewable resources in electrical distribution systems. This work addresses the large-signal stability analysis of a DC–DC bidirectional converter (DBC) connected to a storage device in an islanding MG. This converter is responsible for controlling the balance of power (load demand and generation) under constant power loads (CPLs). In order to control the DC bus voltage through a DBC, we propose a robust sliding mode control (SMC) based on a washout filter. Dynamical systems techniques are exploited to assess the quality of this switching control strategy. In this sense, a bifurcation analysis is performed to study the nonlinear stability of a reduced model of this system. The appearance of different bifurcations when load parameters and control gains are changed is studied in detail. In the specific case of Teixeira Singularity (TS) bifurcation, some experimental results are provided, confirming the mathematical predictions. Both a deeper insight in the dynamic behavior of the controlled system and valuable design criteria are obtained.

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Estabragh, Mohsen Rezaie, Ali Dastfan, and Morteza Rahimiyan. "Grid-Tied Hybrid AC-DC Microgrid: Finding Optimal Number of Parallel-Connected AC-DC Bidirectional Interfacing Converters." International Transactions on Electrical Energy Systems 2022 (June 2, 2022): 1–14. http://dx.doi.org/10.1155/2022/1932818.

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Linking AC and DC microgrids via a bidirectional AC-DC interfacing converter has emerged the hybrid AC-DC microgrid. The DC bus is connected to the grid by a series converter to mitigate the grid voltage’s power quality problems. To enhance the reliability and to increase transferring active and nonactive powers between DC and AC main buses, the AC-DC bidirectional interfacing converters are connected in parallel. In this paper, the optimal number (n) of parallel-connected bidirectional interfacing converters is obtained to minimize the annual cost of investment and the reliability cost. A two-step deciding algorithm is proposed to find n. First, active and nonactive powers between DC and AC buses are obtained with power quality and power flow considerations. Based on two types of powers, two reliability indices are calculated, including the expected energy shortage (EES) based on active power and the expected Volt-Amps shortage (EVAS) based on nonactive power. The sum of two reliability index costs is considered as the reliability cost. Next, a decision-making strategy is executed to determine the optimal n by making a trade-off between minimization of two objectives: the annual cost of investment and the reliability cost. The simulations of a grid-tied hybrid AC-DC microgrid are done with the experimental measurement data of DC and AC loads and distributed generations. Simulation results verify the performance of the represented approach.

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Vani, E., and N. Rengarajan. "Optimal operation of Low Cost Topology for Improving the Power Quality in the Wind Power Conversion System." Indonesian Journal of Electrical Engineering and Computer Science 1, no. 3 (March 1, 2016): 523. http://dx.doi.org/10.11591/ijeecs.v1.i3.pp523-533.

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In this paper, Vienna rectifier and Z Source Inverter (ZSI) based Wind Power Conversion System (WPCS) has been proposed with less number of switches to provide high quality power to off grid system. The three phase full bridge converter has six switches for the conversion of AC-DC and also need separate DC-DC boost converter to boost the DC voltage. In the proposed WPCS, three Phase Vienna rectifier has only three switches for the conversion of AC-DC and also it boosts the DC voltage. The ZSI jointly with Vienna rectifier provides higher, boosted AC voltage and high quality power to the off grid system. The ZSI utilizes the shoot-through states to boost the DC link voltage and also, reduces the Electromagnetic Interference (EMI) noise. The combination of Vienna rectifier and Z source inverter shows the good performance which improves the efficiency and reduces Total Harmonic Distortion (THD). The performance of the proposed system is simulated using MATLAB/Simulink software. Simulation and experimental results expose that, this configuration is beneficial with respect to power quality improvement with less number of switches compared to a conventional converter.

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Samal, Sarita, and Prakash Kumar Hota. "Power Quality Improvement by Solar Photo-voltaic / Wind Energy Integrated System Using Unified Power Quality Conditioner." International Journal of Power Electronics and Drive Systems (IJPEDS) 8, no. 3 (September 1, 2017): 1416. http://dx.doi.org/10.11591/ijpeds.v8.i3.pp1416-1426.

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The real problems in diminution of power quality occurs due to the rapid growth of nonlinear load are leads to sudden decrease of source voltage for a few seconds i.e sag, swell, harmonics in source and load current, voltage unbalance etc. All these problems can be compensated by using Unified Power Quality Controller (UPQC) and the operation of UPQC depends upon the available voltage across capacitor present in dc link. If the capacitor voltage is maintained constant then it gives satisfactory performance. The proposed research is basically on designing of Photo Voltaic (PV) /Wind energy fed to the dc link capacitor of UPQC so as to maintain proper voltage across it and operate the UPQC for power quality analysis. The said model is simulated in Matlab and results are verified by using FFT analysis.The proposed PV/ Wind energy-UPQC is design in Matlab simulation for reduction of voltage sag, swell, interruption of voltage, harmonics in load current and compensation of active and reactive power.

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Antar, Rakan Khalil, Basil Mohammed Saied, and Rafid Ahmed Khalil. "Power Quality Improvement of High Voltage DC Link using Modified Shunt Active Power Filter." Al-Kitab Journal for Pure Sciences 1, no. 1 (June 17, 2018): 54–66. http://dx.doi.org/10.32441/kjps.v1i1.91.

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A new control strategy for active power filters is proposed, modeled and implemented in order to improve the power quality of a line commutated converter High voltage DC link. The ability of reactive power and harmonics reductions are generally met by using passive and active power filters. In this paper, modified active power filter with a modified harmonics pulse width modulation algorithm is used to minimize the source harmonics and force the AC supply current to be in the same phase with AC voltage source at both sending and receiving sides of a line commutated converter high voltage DC link. Therefore, it is considered as power factor corrector and harmonics eliminator with random variations in the load current. The modified harmonics pulse width modulation algorithm is applicable for active power filter based on a three-phase five-level and seven-level cascaded H-bridge voltage source inverter. Simulation results show that the suggested modified multilevel active power filters improve total harmonics distortion of both voltage and current with almost unity effective power factor at both AC sides of high voltage DC link. Therefore, modified active power filter is an effective tool for power quality improvement and preferable for line commutated converter high voltage DC link at different load conditions.

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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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Swapna Sai, P., G. G. Rajasekhar, T. Vijay Muni, and M. Sai Chand. "Power quality and custom power improvement using UPQC." International Journal of Engineering & Technology 7, no. 2.20 (April 18, 2018): 41. http://dx.doi.org/10.14419/ijet.v7i2.20.11742.

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The Series and Shunt units don’t have a typical dc link. So their control systems not exactly as same as the traditional UPQC control strategies.This device can improve power quality and composes power electronic series which was in MV/LV Substation, alongside a few electronic-shunt units associated near the end users.Additionally, the increment in power quality can be given to the users we require the shunt units.It reduces the disturbances for all customers that supply main series unit. It provides the customerwith the shunt units. A proposed solution model of LV grid is 400-KVA is considered as steady-state performance and functionalizing units. Outcomes acquired under enduring state conditions justify the design picked and great gadget execution.

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Zhang, Chunjiang, Pengcheng Li, and Yingjun Guo. "Bidirectional DC/DC and SOC Drooping Control for DC Microgrid Application." Electronics 9, no. 2 (January 30, 2020): 225. http://dx.doi.org/10.3390/electronics9020225.

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In DC microgrids, distributed energy storage plays a key role in stabilizing the DC bus voltage. The bidirectional DC/DC converter in the distributed energy storage system should be designed according to the voltage level and electromagnetic isolation requirements, and multiple energy storage units should be coordinated for load current distribution according to the state of charge (SOC). This paper proposes a SOC power index droop control strategy by communication lines to coordinate the fast and high-precision distribution of load current among multiple energy storage units, and the SOC between energy storage units quickly converges to a consistent state. Considering that communication lines are susceptible to interference, this paper further proposes an improved SOC power index droop control to overcome the effects of communication line failures. Considering the high cost of the energy storage unit, it should be connected to the DC microgrid in layers to achieve a reasonable allocation of resources in practical applications. In order to provide high-quality power to a large power grid, the quantification standards of the DC bus fluctuation range and the working range of each converter are further discussed to maximize the stability of the DC bus voltage and grid-connected power fluctuation.

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Muralidharan, S., M. Muhaidheen, R. Banumalar, and S. Alagammal. "Optimization of Harmonics in Novel Multilevel Inverter using Black Wolf and Whale Optimization algorithms." International Journal of Electrical and Electronics Research 10, no. 3 (September 30, 2022): 705–10. http://dx.doi.org/10.37391/ijeer.100347.

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High-quality electrical energy is the most needed thing for standard living. We use power electronics converters for the conversion of different forms of electrical energy and we use them for producing quality power output. We use semiconductor devices as switches in the process of conversion of DC-DC, AC-DC, AC-AC, and DC-AC according to the requirement of the system. In this paper, an attempt is made to analyze the quality of output power from a multilevel inverter which is used in the conversion of DC supply to AC output voltage. Production of quality power by optimizing the multilevel inverter switching using Whale Optimization Algorithm helps the proposed inverter topology to perform well. The suggested topology and the optimization technique will help in harvesting multiple renewable energy sources with improved quality of power. Different DC sources of different voltage levels could be connected in input and the resultant AC output has less ripple content as per the IEEE standard. A detailed comparison has been made to show the superiority of the proposed algorithm.

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Savrun, Murat Mustafa, Tahsin Köroğlu, Adnan Tan, Mehmet Uğraş Cuma, Kamil Çağatay Bayindir, and Mehmet Tümay. "Isolated H‐bridge DC–DC converter integrated transformerless DVR for power quality improvement." IET Power Electronics 13, no. 5 (February 5, 2020): 920–26. http://dx.doi.org/10.1049/iet-pel.2019.0687.

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Hasan, Kamrul, Muhammad Murtadha Othman, Nor Farahaida Abdul Rahman, M. A. Hannan, and Ismail Musirin. "Significant implication of unified power quality conditioner in power quality problems mitigation." International Journal of Power Electronics and Drive Systems (IJPEDS) 10, no. 4 (December 1, 2019): 2231. http://dx.doi.org/10.11591/ijpeds.v10.i4.pp2231-2237.

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This paper presents an analysis of a three-phase unified power quality conditioner (UPQC) in terms of design and performance. A back to back connection of a series compensator and a shunt compensator with a common DC-bus is utilized to build the UPQC model. The series compensator compensates the power quality problems such as grid voltage sags/swells for the grid side. During sag and swell condition, the compensated voltage is injected by the series compensator in phase with the point of common coupling (PCC) or out of phase with PCC. The load current harmonics is compensated by using the shunt compensator. The dynamic performance and the steady state of the designed model are analyzed by using MATLAB-Simulink under several disturbances such as PCC voltage harmonics, voltage sags/swells and load unbalancing using a nonlinear load.

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Singh Panwar, Mohan, and Dr Ajay Kumar Bansal. "Power quality management using statcom for grid interfaced wind turbine controlled by microcontroller." International Journal of Engineering & Technology 7, no. 4.5 (September 22, 2018): 576. http://dx.doi.org/10.14419/ijet.v7i4.5.21160.

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Input source for wind power generation in wind turbine is wind. Variation of wind is uncontrolled. Quality of power gener- ated in a windmill is very poor due to uncontrolled and fluctuated nature wind. As per International Electro-technical Commission standard, IEC-61400 norms the power quality and measurements of wind turbine is to be calculate. Electrical energy generated from wind power is based on minimum pollution of environment as comparative to conventional sources of generation. In a grid connected wind power system there are some power quality issues. In grid integrated wind power systems, quality of power is measured by active power, reactive power & variation of voltages measured under guidelines of national & international standards. In this proposed system, the energy generated by wind turbine is converted to DC & DC bus is charged. A microcontroller regulated PWM inverter convert this DC voltage to AC to feed it to grid. The pro- posed DC Bus is augmented by PV (photovoltaic) charged Battery Based PWM controlled STATCOM.

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Kumar, C. Krishna, and A. Nirmal Kumar. "Power Quality Issues on DC-Bus-Connected Photovoltaic System." International Journal of Green Energy 9, no. 1 (January 2012): 39–50. http://dx.doi.org/10.1080/15435075.2011.617020.

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Jayanth, D. "Integration of DC Microgrid with Existing System." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (June 30, 2021): 3034–36. http://dx.doi.org/10.22214/ijraset.2021.34870.

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Modern trends of power circle are swiftly tending towards more sensitive form of energy generation to sustain the sensitive loads like electric-powered, commercial loads. By integrating the DC microgrid, we can increase the quality of power. DC microgrid has good use rather than AC microgrid. DC microgrid is the best solution to the raised problems like reliability, stability and efficiency of the existing system. That's why here we integrating DC micro grid for good power quality.

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Todd, R., and A. J. Forsyth. "DC-bus power quality for aircraft power systems during generator fault conditions." IET Electrical Systems in Transportation 1, no. 3 (2011): 126. http://dx.doi.org/10.1049/iet-est.2010.0056.

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Kakigano, Hiroaki, Yushi Miura, Toshifumi Ise, and Ryohei Uchida. "DC Micro-grid for Super High Quality Electric Power Distribution." IEEJ Transactions on Power and Energy 126, no. 12 (2006): 1207–14. http://dx.doi.org/10.1541/ieejpes.126.1207.

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Singh, Bhim, and Vashist Bist. "An Improved Power Quality BIBRED Converter-Based VSI-Fed BLDC Motor Drive." International Journal of Emerging Electric Power Systems 15, no. 1 (January 18, 2014): 25–33. http://dx.doi.org/10.1515/ijeeps-2013-0144.

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Abstract This paper presents an IHQRR (integrated high-quality rectifier regulator) BIBRED (boost integrated buck rectifier energy storage DC-DC) converter-based VSI (voltage source inverter)-fed BLDC (brushless DC) motor drive. The speed control of BLDC motor is achieved by controlling the DC link voltage of the VSI using a single voltage sensor. This allows VSI to operate in fundamental frequency switching mode for electronic commutation of BLDC motor which reduces the switching losses due to high-frequency switching used in conventional approach of PWM (pulse width modulation)-based VSI-fed BLDC motor drive. A BIBRED converter is operated in a dual-DCM (discontinuous conduction mode) thus using a voltage follower approach for PFC (power factor correction) and DC link voltage control. The performance of the proposed drive is evaluated for improved power quality over a wide range of speed control and supply voltage variation for demonstrating the behavior of proposed drive. The power quality indices thus obtained are within the recommended limits by international PQ (power quality) standards such as IEC 61000-3-2.

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K V, Bindu, and B. Justus Rabi. "A Novel Power Factor Correction Rectifier for Enhancing Power Quality." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 4 (December 1, 2015): 772. http://dx.doi.org/10.11591/ijpeds.v6.i4.pp772-780.

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In this paper, the disturbances in power system due to low quality of power are discussed and a current injection method to maintain the sinusoidal input current which will reduce the total current harmonic distortion (THD) as well as improve the power factor nearer to unity is proposed. The proposed method makes use of a novel controlled diode rectifier which involves the use of bidirectional switches across the front-end rectifier and the operation of the converter is fully analyzed. The main feature of the topology is low cost, small size, high efficiency and simplicity, and is excellent for retrofitting front-end rectifier of existing ac drives, UPS etc. A novel strategy implementing reference compensation current depending on the load harmonics and a control algorithm for three-phase three-level unity PF rectifier which draws high quality sinusoidal supply currents and maintains good dc link- voltage regulation under wide load variation. The proposed technique can be applied as a retrofit to a variety of existing thyristor converters which uses three bidirectional switches operating at low frequency and a half-bridge inverter operating at high frequency .The total power delivered to the load is processed by the injection network, the proposed converter offers high efficiency and not only high power factor but also the Total Harmonic Distortion is reduced. Theoretical analysis is verified by digital simulation and a hardware proto type module is implemented in order to confirm the feasibility of the proposed system. This scheme in general is suitable for the common variable medium-to high-power level DC load applications.

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Zhu, Yi-feng, Hai-jun Tao, and Qiong-xuan Ge. "The Impact of DC-power Layout on Stray Inductance of Bridge Arm in Power Converters." Open Electrical & Electronic Engineering Journal 9, no. 1 (February 16, 2015): 1–6. http://dx.doi.org/10.2174/1874129001509010001.

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In high power converter design, low-inductance busbar connecting DC capacitors and power devices is the main concern to improve the quality of the whole power electronics system. There are several facts which affect the stray inductance of bridge arm. This paper mainly analyzes the influence of DC-power layout on the stray inductance taking a subway traction converter as example. The Psim9.0 software was used to calculate the stray inductance. The conclusion is that DC-power connection should be put different side from DC capacitance because lower stray inductance can be obtained than that of the same side. The simulation and experimental results are given to illustrate the effectiveness.

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Xiong, Jun Jie, Wen Bin Wang, and Wei He. "Analysis of the Influence of High-Speed Railway on Power Quality." Advanced Materials Research 1061-1062 (December 2014): 1017–20. http://dx.doi.org/10.4028/www.scientific.net/amr.1061-1062.1017.

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This paper analyzes the influence of ChangJiu High-speed Railway on power quality. Compared with the traditional AC-DC electric locomotive, AC-DC-AC electric locomotive has been widely used in High-speed Railway which harmonic content decreased significantly, power factor also improved. Based on the RTDS simulation, voltage sags have not been caused when electric locomotive is starting.

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Zhu, Yi Feng. "Impact of DC-Power Connection on the Stray Inductance of Bridge Arm in High-Power Converters." Advanced Materials Research 722 (July 2013): 98–102. http://dx.doi.org/10.4028/www.scientific.net/amr.722.98.

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In high-power converter design, low-inductance busbar connecting DC capacitors and power devices is main concern to improve the quality of the whole power electronics system. There are several facts which affect the stray inductance of bridge arm. This paper mainly analyzed the influence of DC-power connection on the stray inductance. The Psim9.0 software were used to calculated the stray inductance. The conclusion is that DC-power connection should be put different side of DC capacitance because lower stray inductance can be obtained than that of the same side. The simulation results are given to illustrate the effectiveness.

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Lara, Jorge, Concepción Hernández, Marco Arjona, Lesedi Masisi, and Ambrish Chandra. "Bidirectional EV charger with ancillary power quality capabilities." Ingeniería Investigación y Tecnología 23, no. 1 (January 1, 2022): 1–10. http://dx.doi.org/10.22201/fi.25940732e.2022.23.1.008.

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This paper presents a bidirectional electric vehicle (EV) charger with ancillary power quality (PQ) capabilities in grid-to-vehicle (G2V), vehicle-to-grid (V2G) and vehicle-to-home (V2H) applications. The proposed configuration consists of a five-level (5L) neutral point clamped (NPC) converter in cascaded with a dual-active half bridge (DAHB) DC-DC converter. The proposed cascaded control strategy used for regulating the common DC bus voltage as well as for compensating the grid current harmonics and the reactive power through the 5L-converter is based on a performant proportional-resonant (PR) compensator. By applying the single-phase-shift (SPS) technique to the DAHB converter, the battery power flow is accurately regulated. A detailed study with exhaustive tests and simulation results obtained in MATLAB-SimPowerSystems for a full-scale power system based on a Nissan Leaf´s battery validate the fairly good performance of the proposed configuration and control strategies. The main achievements of this work are: 1) the system’s stability is maintained even during fairly abrupt changing conditions, 2) in steady state of the G2V/V2G operation modes, the total harmonic distortion (THD) of the grid current remains below 3% while the power factor (PF) is kept at unity, 3) the reactive power demanded from the grid is zero in spite of feeding a highly nonlinear load, and 4) when a power outage occurs, the transition to the V2H mode is seamless and the home load is uninterruptedly supplied with a very low-distortion output voltage from the 5L-converter.

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Das, Soumya Ranjan, Alok Kumar Mishra, Prakash Kumar Ray, Surender Reddy Salkuti, and Seong-Cheol Kim. "Application of Artificial Intelligent Techniques for Power Quality Improvement in Hybrid Microgrid System." Electronics 11, no. 22 (November 21, 2022): 3826. http://dx.doi.org/10.3390/electronics11223826.

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The hybrid AC-DC microgrid (MG) has gained popularity recently as it offers the benefits of AC and DC systems. Interconnecting AC-DC converters are necessary since the MG has both DC and AC sub-grids. Adding an extra harmonic adjustment mechanism to the interlinking converters is promising because non-linear AC loads can worsen the quality of the voltage on the AC bus. The interlinking converters’ primary function is to interchange real and reactive power between DC and AC sub-grids, so the typical harmonic controlling approach implemented for active power filters (APFs) might not be appropriate for them. When the MG’s capacity is high, it is desirable that the switching frequency be lesser than the APFs. The performance of harmonic correction or even system stability may suffer at low switching frequencies. In this study, a harmonic compensating technique appropriate for hybrid AC-DC interlinking converters with lower switching frequencies is planned. The suggested strategy, modeling techniques, stability analysis, and a thorough virtual impedance design are discussed in this work.

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Oğuz, Yüksel, İrfan Güney, and Hüseyin Çalık. "Power Quality Control and Design of Power Converter for Variable-Speed Wind Energy Conversion System with Permanent-Magnet Synchronous Generator." Scientific World Journal 2013 (2013): 1–14. http://dx.doi.org/10.1155/2013/783010.

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The control strategy and design of an AC/DC/AC IGBT-PMW power converter for PMSG-based variable-speed wind energy conversion systems (VSWECS) operation in grid/load-connected mode are presented. VSWECS consists of a PMSG connected to a AC-DC IGBT-based PWM rectifier and a DC/AC IGBT-based PWM inverter with LCL filter. In VSWECS, AC/DC/AC power converter is employed to convert the variable frequency variable speed generator output to the fixed frequency fixed voltage grid. The DC/AC power conversion has been managed out using adaptive neurofuzzy controlled inverter located at the output of controlled AC/DC IGBT-based PWM rectifier. In this study, the dynamic performance and power quality of the proposed power converter connected to the grid/load by output LCL filter is focused on. Dynamic modeling and control of the VSWECS with the proposed power converter is performed by using MATLAB/Simulink. Simulation results show that the output voltage, power, and frequency of VSWECS reach to desirable operation values in a very short time. In addition, when PMSG based VSWECS works continuously with the 4.5 kHz switching frequency, the THD rate of voltage in the load terminal is 0.00672%.

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Renius, A. Jeya Selvan, and K. Vinoth Kumar. "Analysis of Variable Speed PFC Chopper Fed BLDC Motor Drive." International Journal of Power Electronics and Drive Systems (IJPEDS) 5, no. 3 (February 1, 2015): 326. http://dx.doi.org/10.11591/ijpeds.v5.i3.pp326-335.

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This paper provides the detailed analysis of the DC-DC chopper fed Brushless DC motor drive used for low-power applications. The various methods used to improve the power quality at the ac mains with lesser number of components are discussed. The most effective method of power quality improvement is also simulated using MATLAB Simulink. Improved method of speed control by controlling the dc link voltage of Voltage Source Inverter is also discussed with reduced switching losses. The continuous and discontinuous modes of operation of the converters are also discussed based on the improvement in power quality. The performance of the most effective solution is simulated in MATLAB Simulink environment and the obtained results are presented.

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Akkilah, Mohammed, and Murtaza Farsadi. "Power Quality Control for Mixed Renewable Energy Systems." Frontier Energy System and Power Engineering 3, no. 1 (January 1, 2021): 1. http://dx.doi.org/10.17977/um049v3i1p1-9.

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Electrical energy is one of the famous and easiest used forms of energy. Electrical energy can be converted to many forms of energy. With the development of technology, the dependency on the electrical energy has been increased greatly nowadays. Such as Computer and telecommunication networks field, railway network banking, post office, life support system are few application that just cannot run without electricity. In this article we will discuss the power quality issues for distributed generation systems based on renewable energy sources, as an example solar and wind energy. A brief explanation about the power quality issues is conducted here.This article starts with the power quality issues, followed by discussions of basic standards. A brief study of power quality in the power system, it includes the systems with dc and renewable sources are done in this article. In addition to the power quality monitoring techniques and its possible solutions for the power quality issues for the power system are briefly discussed. Later we will go through the analyzing step for the methods of mitigation of these problems using custom power devices, such as D-STATCOM, UPQC, UPS, TVSS, DVR, etc., for micro grid systems. As an example for the renewable energy systems, such as the statcom can be an efficient choice due to its several advantages, whereas the spinning reserve can enhance the power quality in traditional systems. Finally, we will discuss the power quality in dc systems. Two Main advantages for a DC system, is the Simple arrangements and higher reliability. Even though it faces many power quality issues such as, instability and poor detection of faults.

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Panati, Poornima Udaychandra, Sridhar Ramasamy, Mominul Ahsan, Julfikar Haider, and Eduardo M. G. Rodrigues. "Indirect Effective Controlled Split Source Inverter-Based Parallel Active Power Filter for Enhancing Power Quality." Electronics 10, no. 8 (April 8, 2021): 892. http://dx.doi.org/10.3390/electronics10080892.

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The existing solutions for reducing total harmonic distortion (THD) using different control algorithms in shunt active power filters (SAPFs) are complex. This work proposes a split source inverter (SSI)-based SAPF for improving the power quality in a nonlinear load system. The advantage of the SSI topology is that it is of a single stage boost inverter with an inductor and capacitor where the conventional two stages with an intermediate DC-DC conversion stage is discarded. This research proposes inventive control schemes for SAPF having two control loops; the outer control loop regulates the DC link voltage whereas the inner current loop shapes the source current profile. The control mechanism implemented here is an effective, less complex, indirect scheme compared to the existing time domain control algorithms. Here, an intelligent fuzzy logic control regulates the DC link voltage which facilitates reference current generation for the current control scheme. The simulation of the said system was carried out in a MATLAB/Simulink environment. The simulations were carried out for different load conditions (RL and RC) using a fuzzy logic controller (FLC) and PI controllers in the outer loop (voltage control) and hysteresis current controller (HCC) and sinusoidal pulse width modulation (SPWM) in the inner loop (current control). The simulation results were extracted for dynamic load conditions and the results demonstrated that the THD can be reduced to 0.76% using a combination of SPWM and FLC. Therefore, the proposed system proved to be effective and viable for reducing THD. This system would be highly applicable for renewable energy power generation such as Photovoltaic (PV) and Fuel cell (FC).

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Suresh, S., S. Kannan, and S. Ponnayira Sundaravel. "A Modified Single Phase H-Bridge Inverter for High Power Applications with Power Quality Improvement." Applied Mechanics and Materials 626 (August 2014): 118–26. http://dx.doi.org/10.4028/www.scientific.net/amm.626.118.

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Various multilevel inverter topologies are widely being used for real power exchange, reactive power compensation, harmonic current mitigation on grid and industrial drive applications with fundamental frequency switching mode of gate control. Still so many topologies are being currently developed with reduced number of switches, improved waveform for power quality improvement with fundamental frequency switching and pwm switching gate control mode. This paper presents the performance analysis of modified H-bridge single phase inverter for high voltage and high power applications. The switching method has been selected to operate the inverter at fundamental frequency switching mode of gate control to be free from lower order harmonics. The inverter has the modulation technique with pre calculated switching angles to generate the required fundamental voltage with reduced Total Harmonic Distortion (THD). So, the switching losses have been reduced hence the efficiency is improved with Power Quality (PQ) improvement in voltage-current waveform. The DC input power is feed to the inverter from DC capacitor voltage divider source, contributed to give various dc voltage levels during fundamental frequency switching of different switching combinations for the generation of stepping output voltage. During dynamic load condition, the magnitude of input dc voltage level across each capacitor has not undergone through big swing to feed the power to the load without affecting generated output ac voltage. The performance of the proposed inverter has been analyzed for dynamic reactive load and induction motor. The MATLAB based simulations have been presented to validate the inverter operation for dynamic reactive load and industrial drive applications with pre calculated THD reduced switching conduction angles for PQ improvement in waveform.

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Gopan K., V., and J. D. Shree. "Implementation of a High Power Quality BLDC Motor Drive Using Bridgeless DC to DC Converter with Fuzzy Logic Controller." Engineering, Technology & Applied Science Research 12, no. 5 (October 2, 2022): 9178–85. http://dx.doi.org/10.48084/etasr.5213.

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Electric motor drives based on electronic power converters having good power quality parameters are getting huge acceptance. Conventional Diode Bridge Rectifier (DBR) and DC to DC converter-based methods have become obsolete, as they provide low power quality indices which hamper the supply by introducing current harmonics and conduction losses. Although there are many developments in motors and control strategies, the risk and complexity of such drives become bottlenecks in implementation. This study implemented a drive scheme with a brushless DC Motor. The new improved bridgeless topology was modified with an advanced fuzzy logic controller to further improve its power quality and performance. Due to low power, a high-speed application of Brush Less (BLDC) motor was selected for the drive scheme. This combination could achieve almost Unity Power Factor (UPF) and significantly improve control compared to conventional topologies. A circuit-wise analysis was conducted to design the converter's components. The modifications were elaborated through mathematical expressions, and the parameters of power quality were analyzed and validated.

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Et. al., Subbarao Mopidevi,. "High Gain DC/DC Converter with IC MPPT Algorithm For DC Micro-Grid Applications." INFORMATION TECHNOLOGY IN INDUSTRY 9, no. 2 (March 24, 2021): 244–50. http://dx.doi.org/10.17762/itii.v9i2.340.

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High gain DC-DC converter with IC MPPT algorithm, solar & wind as inputs in conjunction with this converter are presented in this paper. Recently, due to increase in the green energy demand the renewable energy resources are widely used.DC micro grids are now of significant importance due to the rise in DC loads and the demand for high power quality. These DC loads require various levels of voltage based on their power ratings. The proposed step-up DC-DC converter therefore has a high voltage gain with optimum duty ratio characteristics. In addition, the additional benefit of delivering electricity at two distinct voltage levels is that it is more suitable for DC micro grid applications and all the switches are controlled using single control signal which reduces complexity. The proposed converter is implemented and theoretically verified in SIMULINK MATLAB software for two different load power ratings of 100W and 200W.

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Journal articles on the topic 'Power Quality in DC'

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