Journal articles: 'Active shunt and series active power filter'

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Mandapati, Nikhil, and Rajagopala K. "Power Quality Enhancement using A Unified Power Quality Conditioner (UPQC)." International Journal of Engineering and Advanced Technology (IJEAT) 11, no. 5 (2022): 168–70. https://doi.org/10.35940/ijeat.E3627.0611522.

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Abstract: This project proposes effective work to increase the power quality in the power system by using a Unified Power Quality Conditioner (UPQC) The advanced use of power electronic devices introduces harmonics in the power system which creates a problem in the quality of power delivered. Although several methods are there for improving power quality standards, including the use of active and passive filters, and Hybrid filters have been developed, these methods face issues and are ineffective due to the growing number of applications. The UPQC is an advanced technique for mitigating voltage and load current supply fluctuations. In this project the combination of series active filter and shunt active filter is studied. UPQC is used to reduce the power quality issues like harmonics and sag. The shunt active filter and series active filter performs the simultaneous elimination of current and voltage problems. The project work presents the working of the UPQC filter in such a way that the harmonics are reduced.

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Kishankumar, V. Dave, and B. Parmar Sandip. "Power Quality Improvement by Unified Power Quality Conditioner." International Journal of Trend in Scientific Research and Development 3, no. 1 (2018): 786–91. https://doi.org/10.31142/ijtsrd19088.

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In a powers system network there are many problems related to power quality. So to improve power quality of a system we use different devices such as active power filters. Active power filters are classified into two types that is Shunt Active Power Filter APF and Series Active Power Filter APF and combination of both is known as UPQC Unified Power Quality Conditioner . Here we have done simulation of Shunt Active Power Filter, Series Active Power Filter and Unified Power Quality Conditioner. Shunt APF is used to mitigate the problems due to current harmonics which is because of non linear load and make source current sinusoidal and distortion free. The control scheme used is hysteresis current controller using "p q theory". Series APF is used to mitigate problems caused due to voltage distortion and unbalance present in source voltage and make load voltage perfectly balanced and regulated. The control scheme used is Hysteresis voltage controller by using a b c to d q transformations. Then Shunt APF and Series APF is combined for designing UPQC and by this current harmonics in load current and voltage unbalances in source voltage both are removed and source current becomes sinusoidal and load voltage becomes perfectly balanced. Kishankumar V. Dave | Sandip B. Parmar "Power Quality Improvement by Unified Power Quality Conditioner" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-1 , December 2018, URL: https://www.ijtsrd.com/papers/ijtsrd19088.pdf

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Nikhil, Mandapati, and K. Rajagopala. "Power Quality Enhancement using A Unified Power Quality Conditioner (UPQC)." International Journal of Engineering and Advanced Technology 11, no. 5 (2022): 168–70. http://dx.doi.org/10.35940/ijeat.e3627.0611522.

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This project proposes effective work to increase the power quality in the power system by using a Unified Power Quality Conditioner (UPQC) The advanced use of power electronic devices introduces harmonics in the power system which creates a problem in the quality of power delivered. Although several methods are there for improving power quality standards, including the use of active and passive filters, and Hybrid filters have been developed, these methods face issues and are ineffective due to the growing number of applications. The UPQC is an advanced technique for mitigating voltage and load current supply fluctuations. In this project the combination of series active filter and shunt active filter is studied. UPQC is used to reduce the power quality issues like harmonics and sag. The shunt active filter and series active filter performs the simultaneous elimination of current and voltage problems. The project work presents the working of the UPQC filter in such a way that the harmonics are reduced.

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Paul, P. Jeno. "Shunt Active and Series Active Filters-Based Power Quality Conditioner for Matrix Converter." Advances in Power Electronics 2011 (July 11, 2011): 1–9. http://dx.doi.org/10.1155/2011/930196.

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This paper proposes a series active filter and shunt active filter to minimize the power quality impact present in matrix converters instead of passive filter. A matrix converter produces significant harmonics and nonstandard frequency components into load. The proposed system compensates the sag and swell problems efficiently in matrix converter. The proposed system has been tested and validated on the matrix converter using MATLAB/Simulink software. Simulated results confirm that the active power filters can maintain high performance for matrix converter.

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Vinay, Dasari. "Improvement of Power Quality using a Robust Hybrid Series Active Power Filter." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (2021): 2311–16. http://dx.doi.org/10.22214/ijraset.2021.35494.

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In this paper we are going to see how the DSM PI controller is used to reduce the harmonics in faster. DSM PI controller steps up the voltage to required level. The main aim is to improve the total harmonic distortion. Keywords: Shunt active filter, hybrid active filters, DSM PI controller

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Asghar, Muhammad Awais. "Power Improvement by Mitigating the Harmonic Distortions." Quaid-e-Awam University Research Journal of Engineering, Science & Technology 22, no. 1 (2024): 38–45. https://doi.org/10.52584/qrj.2201.04.

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The study of harmonics in power systems (PS) is very crucial and mitigation of harmonic distortions is one of the main issues these days. Harmonics are distortions in the waveform of a power system with a frequency that is an integral multiple of the frequency variable of the fundamental power line. In this research, our main concern is to design a complete PS model, analyze the effect of nonlinear loads, and mitigate the distortions in PS due to nonlinear loads. We are using three types of filters i.e. series passive, shunt passive, and shunt active filter. The main difference between an active and a passive filter is that we can alter the gain of the active filter even before implementing the model while the gain of the passive filter is fixed and cannot be changed after the model is implemented. Different techniques of active and passive filters are discussed. Furthermore, the SIMULINK model for active and passive filters is presented for validation of our methodology.

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Sandeep, Kaur, and Singh Khela Raja. "Stability Analysis of Power System using FACT Controller." International Journal of Engineering and Advanced Technology (IJEAT) 9, no. 3 (2020): 3732–35. https://doi.org/10.35940/ijeat.C6322.029320.

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The Stability of power system is influenced by different elements such as harmonic distortion attributed to non-linear loads, like unregulated voltage and unstudy current because of sag and swell and switching capacity. One of the effective methods is to make use of an integrated circuit of active shunt and series power filters such as Unified power quality conditioner in short called as UPQC. Such instrument binds a active shunt power filter with a active series power filter in Sequential formation, to simultaneously make up for the regular supply of voltage and current or to remove voltage and current disturbances in a power allocation and networking system. In present article, a latest layout of Unified power quality conditioner in short called as UPQC has been presented, consisting of a electromechanical device such as Direct current to direct current converter and the storage device joined to the dirct current (DC) link of the UPQC to counter the voltage disturbances.

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B.s, Yogananda, and Dr K. Thippeswamy. "COMPENSATION OF HARMONICS TO IMPROVE POWER QUALITY USING HYBRID ACTIVE POWER FILTER." International Journal of Engineering Applied Sciences and Technology 7, no. 6 (2022): 162–69. http://dx.doi.org/10.33564/ijeast.2022.v07i06.014.

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This paper presents design, simulation and development of hybrid active power filter for mitigation of the power quality problem at ac mains in ac-dc power supply feeding to a nonlinear load. The power filter is consisting of a shunt passive filter connected in series with an active power filter. At first passive filter has been designed to compensate harmonics. The drawback associated with the passive filter like fixed compensation characteristics and resonance problem is tried to solve by HAPF. Simulations for a typical distribution system with a hybrid power filter have been carried out to validate the presented analysis. Harmonic contents of the source current has been calculated and compared for the different cases to demonstrate the influence of harmonic extraction circuit on the harmonic compensation characteristic of the shunt hybrid power filter.

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Kamal, Janjirala Sai. "Series Compensation by using Shunt Active Filter to Mitigate the Harmonic Currents." International Journal for Research in Applied Science and Engineering Technology 9, no. VI (2021): 3012–13. http://dx.doi.org/10.22214/ijraset.2021.35493.

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The rise in power electronic devices in power system has increased the problems of harmonics and power quality. In this paper I have discussed about the harmonics that are developed in power system due to non-linear loads. The damage of harmonics may rise from normal level to high level depending on their duration and the order of harmonic .So to mitigate this harmonics in power system I have introduced shunt active power filter by series compensation method. In this paper it is discussed how harmonics are reduced using shunt active power filter and it is shown through MATLAB/Simulink .The results of the simulation have been shown where the harmonics developed in power supply has reduced.

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Maharta Pemayun, A. A. Gede, I. Nym Budiastra, and I. W. Rinas. "ANALISIS EFESIENSI TRAFO DAYA TERHADAP PENGOPERASIAN BEBERAPA JENIS HARMONIC FILTER." Jurnal SPEKTRUM 7, no. 4 (2020): 76. http://dx.doi.org/10.24843/spektrum.2020.v07.i04.p10.

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Nonlinear load is one of the causes of harmonics in utility systems. To reduce harmonicdistortion that appears, usually in utility systems, Harmonic Filters are operated such as:passive filters, active filters, series hybrid filters and hybrid shunt filters. Harmonic distortion thatoccurs will increase losses in the utility system. Losses that appear will affect the efficiency ofthe Power transformer being operated. From the analysis results, the order of the best to worstfilter efficiency is hybride filter (? = 97.26%), active filter (? = 96.72%) and passive filter (? =95.73%).

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Tiwari, Siddhant, Balram Yadav, and Indrajeet Kumar. "THE UNIFIED POWER QUALITY CONDITIONER: A REVIEW." INTERNATIONAL RESEARCH JOURNAL OF ENGINEERING & APPLIED SCIENCES 10, no. 1 (2022): 05–12. http://dx.doi.org/10.55083/irjeas.2022.v10i01002.

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This thesis addresses the Unified Power Quality Conditioner (UPQC) which is a major custom power solutions capable for load balancing, power factor-correction, voltage regulation, voltage and current harmonics mitigation in a three-phase three-wire distribution system for different combinations of linear, non-linear and dynamic loads. The unit template technique (UTT) is used to get the reference signals for series active power filter and shunt active power filter which utilizes two closed loop PI controllers. The design of three- phase three-wire UPQC includes the design of shunt controller (SHUC) and series controller (SERC).

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Al-Zamil, A. M., and D. A. Torrey. "A passive series, active shunt filter for high power applications." IEEE Transactions on Power Electronics 16, no. 1 (2001): 101–9. http://dx.doi.org/10.1109/63.903994.

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Muhammad, Adnan, Salim Butt Muhammad, and Younas Waqas. "Hybrid Active Power Filter for Optimization of Power Quality Improvement." European Journal of Advances in Engineering and Technology 5, no. 2 (2018): 128–35. https://doi.org/10.5281/zenodo.10702285.

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ABSTRACT Now-a-days with the improvement of technology, the demand for electric power is increasing at a growing rate. Many consumer appliances demand quality improvement in power constantly for their operation. The performance of the end user accessories dependent on the quality of power supplied. But the quality of power delivered to the consumer is affected by various factors. They are like frequency and voltage variations, faults, interruption etc. These power quality issues reduce the life time and efficiency of the equipment. The main affect caused by these problems is the presence of harmonics and interharmonics. This leads to the overheating of the equipment, insulation breakdown and over speeding of motors etc. The solution to run over these problems is to filter out these harmonics. For this purpose, there are many filters to snub harmonics but we use hybrid active filter which is combination of active series and shunt passive filter. This paper presents a control strategy for reduction of harmonics and simulation on MATLAB SIMULNK is present.

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Peng, F. Z., Masakazu Kohata, and Hirofumi Akagi. "Compensation Characteristics of Shunt Active and Series Active Power Filters." IEEJ Transactions on Industry Applications 113, no. 1 (1993): 33–40. http://dx.doi.org/10.1541/ieejias.113.33.

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Peng, F. Z., Masakazu Kohata, and Hirofumi Akagi. "Compensation characteristics of shunt active and series active power filters." Electrical Engineering in Japan 114, no. 2 (1994): 104–13. http://dx.doi.org/10.1002/eej.4391140210.

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Wu, Ke, Yunhao Jiang, and Ruoxuan Li. "Active Power Filter LCL Filter Novel Interface Control Scheme Analysis." Journal of Physics: Conference Series 2310, no. 1 (2022): 012067. http://dx.doi.org/10.1088/1742-6596/2310/1/012067.

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Abstract Shunt active power filter (SAPF) has been widely used in active distribution network system. Improving the compensation performance of SAPF has become the focus of many scholars. The traditional filter interface usually adopts series resistance. In order to reduce the loss of damping resistance and ensure the compensation performance of SAPF, a new type of passive interface is adopted, and the double-loop control scheme of PI control combined with repeated control is adopted. By comparing the difference of the selected points of different feedback currents, when the feedback current is taken from the inverter, only a small damping resistance is needed to achieve good steady-state accuracy. Simulation results verify the correctness and effectiveness of the proposed scheme and the system feedback current selection method.

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Shawanti, Roy, Sarker Jayanti, Paramanik Sayan, and Sarker Krishna. "Unified Power Quality Conditioner (UPQC) research study on steady - state power flow." i-manager's Journal on Circuits and Systems 12, no. 1 (2024): 12. https://doi.org/10.26634/jcir.12.1.20676.

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This paper presents a conceptual study of the Unified Power Quality Conditioner (UPQC) in mitigating voltage swell and sag occurrences on power distribution networks. A distinctive feature of UPQC is its capability to inject voltage within a range of 0° to 360° relative to the utility or Point of Common Coupling (PCC) voltage phase angle. Leveraging this capability, UPQC can either inject or absorb active power, enabling operation in modes of zero active power consumption, active power absorption, or active power delivery. Specifically, during voltage swell and sag conditions, the series Active Power Filter (APF) component of UPQC operates in active power delivery and absorption modes, respectively. Simultaneously, the shunt APF component aids the series APF by stabilizing the DC link voltage at a constant level. The shunt APF also compensates for the load's reactive power demands and reduces harmonics generated by it. MATLAB/Simulink simulation results validate the analysis for different types of loads, such as linear, non-linear, sensitive, and EV charging stations.

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Ms., Rohini. R. Dabhade* Prof. C. Veeresh. "RESOLVEMENT OF POWER QUALITY PROBLEMS BY UNIFIED POWER QUALITY CONDITIONER (UPQC)." INTERNATIONAL JOURNAL OF ENGINEERING SCIENCES & RESEARCH TECHNOLOGY 5, no. 8 (2016): 63–67. https://doi.org/10.5281/zenodo.59954.

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In this project presents a Design of a Unified Power Quality conditioner (UPQC) connected to three phase four wire system (3P4W). The neutral of series transformer used in the fourth wire for the 3P4W system. The neutral current that may flow toward transformer neutral point is compensated by using a four-leg voltage source inverter topology for shunt part. The series transformer neutral will be at virtual zero potential during all operating conditions. In this simulation we observe the power quality problems such as unbalanced voltage and current, harmonics by connecting non linear load to 3P4W system with Unified Power Quality conditioner. A new control strategy such as unit vector template is used to design the series APF to balance the unbalanced current present in the load currents by expanding the concept of single phase P-Q theory.

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., Hardik Jayeshkumar Padariya. "GENERALIZED FRYZE CONTROL STRATEGY FOR SHUNT AND SERIES ACTIVE POWER FILTER." International Journal of Research in Engineering and Technology 03, no. 04 (2014): 592–96. http://dx.doi.org/10.15623/ijret.2014.0304104.

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Barbosa, P. G., J. A. Santisteban, and E. H. Watanabe. "Shunt-series active power filter for rectifiers AC and DC sides." IEE Proceedings - Electric Power Applications 145, no. 6 (1998): 577. http://dx.doi.org/10.1049/ip-epa:19981932.

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Zahzouh, Zoubir, Lakhdar Khochmane, and Ali Haddouche. "A New Multilevel Active Power Filter Using Switches Meticulously Controlled." International Journal of Power Electronics and Drive Systems (IJPEDS) 6, no. 1 (2015): 168. http://dx.doi.org/10.11591/ijpeds.v6.i1.pp168-177.

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Shunt active power filter based on multilevel inverter is used to compensate the power factor and to delete the harmonics. This one permits to reduce the inverse voltages applied to the filter switches and their switching frequencies. Nevertheless, the high number of used switches requires a complicated controller and increases the switching losses; where the necessity of finding another resolution system. In this work a new topology of multilevel inverter is proposed as a shunt active power filter using two IGBT transistors in series of opposite sense meticulously controlled by a parallel control algorithm, with the concept of reduced number of six switches which are able to create five levels of the output voltage. This system substute the classical system of eight switches. The harmonic currents identification is carried out using the instantaneous active and reactive power method. The simulation is performed using Matlab/Simulink. The obtained results show that the filtering performances are well enhanced.

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Nisha Babulal Lodha. "A Thorough Examination of Harmonic Mitigation Techniques Through a Comparative Study of the UVT and PWM Methods within Power Systems." Communications on Applied Nonlinear Analysis 32, no. 2 (2024): 295–304. http://dx.doi.org/10.52783/cana.v32.1743.

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Introduction: To mitigate the harmonic disturbances caused by non-linear loads, the selection of active power filters has emerged as a means to enhance filter efficiency and address numerous issues associated with traditional passive filters. A critical aspect of effectively implementing an active filter is the adoption of a robust method for generating current or voltage references. Various implementations, grounded in different theoretical frameworks (whether in the time or frequency domain), continuously evaluate their performance to provide increasingly effective solutions. Objectives: This paper presents a comparative review of two distinct methods. Specifically, it examines the shunt active power filter, where the control strategies are based on the Unit Vector Template (UVT) and compares it with the Pulse Width Modulation (PWM) method. Methods: SPWM modulation control method employs a single pulse for every half cycle, and the duration of this pulse is modified to control the output voltage of the inverter. Gating signals are generated by comparing a rectangular reference signal of amplitude Er with a triangular carrier wave of amplitude. The basic system block diagram, showing the use of the UVT (Unit Vector Template) approach. The SAF acts as a component linked in series, successfully neutralizing the harmonic and reactive currents generated by a nonlinear load. As a result, the overall current taken from the primary AC source displays a sinusoidal pattern. In an ideal scenario, the Active Filter (AF) should generate only the required harmonic current to compensate for the nonlinear loads in the circuit. ResultsThis report explores a method for reducing harmonics using the Shunt Active Filter (Shunt AF) to improve the quality of electric power at the distribution stage. The Shunt AF efficiently tackles the power quality issues linked to current from loads, such as reactive current, imbalance, harmonics, and neutral current. Conclusions: Out of the two methods examined, the Unbalanced Voltage Technique (UVT) exhibits better results. When compared to other methods, the UVT method offers several advantages such as smaller switching losses, less memory utilization, reduced computing requirements, and much higher speed.

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Baliyan, Arjun, Majid Jamil, M. Rizwan, Ibrahim Alsaidan, and Muhannad Alaraj. "An Intelligent PI Controller-Based Hybrid Series Active Power Filter for Power Quality Improvement." Mathematical Problems in Engineering 2021 (February 27, 2021): 1–10. http://dx.doi.org/10.1155/2021/6565841.

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The quality of power that is degrading day by day is an important issue for all the consumers. The important factor for this is harmonics in the voltage and current waveforms which can be resolved by the use of hybrid series active power filter. The combination consists of a series active power filter and a shunt passive filter connected in parallel to the load. The method used in this paper is for the purpose of achieving good harmonic compensation and reduced total harmonic distortion for various types of nonlinear loads as per the standards of IEEE 519. The proposed HSAPF technique uses the synchronous reference frame method for generating the compensating signal with an intelligent PI controller that uses particle swarm optimization (PSO) technique to obtain the required gain values needed to improve the steady state response of the system. The concept of vigorous HSAPF has been authenticated through MATLAB simulation analysis, and the results obtained validate the accuracy of the method for the different load conditions.

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Dr., S. Srinath. "Mitigation of Power Quality Problems in Distribution System under Non Sinusoidal Supply Condition with UPQC using Mixed Mode Control Strategy." Journal of Instrumentation and Innovation Sciences 4, no. 1 (2019): 19–47. https://doi.org/10.5281/zenodo.2640017.

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A mixed mode control strategy for Unified Power Quality Conditioner (UPQC), which involves no transformation, is presented and demonstrated for compensating the power quality problems under non sinusoidal supply condition in a three phase distribution system. UPQC is a combination of Series Active Power Filter (SAPF) and Parallel Active Power Filter (PAPF) with a common dc link. The series compensation voltage and shunt compensation current are controlled in the present work by SPWM switching of SAPF and hysteresis control of PAPF respectively. Exhaustive simulation studies are carried out using PSCAD/EMTDC to validate the performance of UPQC with mixed mode control under non sinusoidal supply condition for compensating voltage sag, swell, unbalance in supply voltage and the effect of sudden load change. The effectiveness of mixed mode control is confirmed by comparing the results of hysteresis control applied to both APFs while mitigating the power quality problems.

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, M Sonia, Kundeti Krishna Rao. "Application of Fuzzy Controller for Improvement of Power Quality using UPQC." International Journal for Modern Trends in Science and Technology, no. 8 (August 5, 2020): 27–30. http://dx.doi.org/10.46501/ijmtst060806.

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Generally, one of the custom power device in FACTS called unified power quality conditioner, which is used to compensate the voltage and current-related Power Quality issues in the distribution systems. The proposed UPQC technology have an advantage of reduced dc-link voltage without compromising its compensation capability. This new method also helps to meet the requirement of dc-link voltage for the shunt and series active filters of the UPQC. This type of topology has a capacitor in series with the interfacing inductor across the shunt active filter for filtering purpose, and the system neutral is also considered and directly connected to neutral of distribution system avoid the requirement of the fourth leg in the voltage source inverter. This paper also presents a concept for improving power quality of a power distribution system such as an FUZZY logic controller along with the UPQC control strategy. The simulation results are compared for both conventional PI controller and FUZZY controller.

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Yun, Wei Jun, Gang Yao, Li Dan Zhou, Chen Chen, and Jun Min Pan. "Power Quality Enhancement Using a Novel Hybrid Active Power Filter Device Under Nonlinear Loads." Advanced Materials Research 516-517 (May 2012): 1419–24. http://dx.doi.org/10.4028/www.scientific.net/amr.516-517.1419.

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Nonlinear loads generate a large amount of characteristic harmonics , deteriorate the power quality of power distribution systems in Advanced manufacturing enterprises. In this paper a novel hybrid active power filter is proposed which consists of a series thyristor switched filter (TSF) and small rated shunt active power filter(APF). TSF is tuned at fifth and seventh order harmonic frequencies. Consequently APF compensates for third and other order harmonics, unbalance current and reactive power. A new control method based on PHC strategy is presented for APF. The device has already got an application in one of the transformer substations of a automobile factory. It’s revealed that the proposed device can improve the power factor , reduce the harmonics injection and enhancement power quality of the power distribution systems.

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Sukumar, Preetha, M. Ramachandran, K. Umamaheswari, and A. Maryia Chithra Mary. "Reduction of Source Current and Source Voltage Harmonics Using SHAPF." Asian Journal of Electrical Sciences 7, no. 2 (2018): 65–69. http://dx.doi.org/10.51983/ajes-2018.7.2.2784.

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This paper investigate the source current and voltage harmonics reduction under unbalanced supply condition. The current harmonics produced are reduced by the Shunt active filter. In order to reduce the voltage harmonics Shunt active filter is not capable. So SHAPF is designed to compensate the source current and voltage harmonics. SHAPF is also used for compensation of reactive power and improve power quality. It also eliminates series and parallel resonance. The control technique for the SHAPF is based on the Instantaneous Reactive Power Theory. Both the real and reactive power are changed in terms of voltage component. In order to compensate the source current and load voltage harmonics the reference voltage is calculated. Simulations are carried out on MATLAB-Simulink and results are presented.

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Nos, Oleg, Ekaterina Kucher, and Alina Baklyak. "Control strategies of the series-shunt active power filters." Proceedings of the Russian higher school Academy of sciences, no. 2 (June 19, 2015): 77–87. http://dx.doi.org/10.17212/1727-2769-2015-2-77-87.

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CHENNAI, Salim. "Unified Power Quality Conditioner Performance based on Multi-level Inverter Topologies using Intelligent Controllers." Algerian Journal of Signals and Systems 7, no. 3 (2022): 109–16. http://dx.doi.org/10.51485/ajss.v7i3.166.

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This paper presents unified power quality conditioner (UPQC) system based on three-level neutral point clamped (NPC) using Fuzzy and ANN controllers. The proposed UPQC is able to mitigate source current harmonics and compensate all voltage disturbances. It is designed by the integration of series and shunt active filters (AFs) sharing a common DC bus capacitor. The DC voltage is maintained constant using proportional integral voltage controller. The synchronous reference frame (SRF) theory is used to get the reference signals for the shunt APF and the power reactive theory (P-Q theory) for the series APF.Conventional control schemes require complex calculations, the use of intelligent systems help to reduce the control system size and the operation complexity. The shunt and series active power filter (APF) reference signals derived from the control algorithm are injected in Fuzzy and Ann intelligent controllers to generate switching signals. The performances of the proposed UPQC system are evaluated using Matlab-Simulink software and SimPowerSystem Toolbox under various operation conditions. The simulation results show the performance of the proposed UPQC based on intelligent controllers to improve the power quality in steady and transient conditions operation.

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Yeison, Alberto Garcés Gómez, Toro García Nicolás, and Edimer Hoyos Fredy. "Unit vector template generator applied to a new control algorithm for an UPQC with instantaneous power tensor formulation, a simulation case study." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 4 (2020): 3889–97. https://doi.org/10.11591/ijece.v10i4.pp3889-3897.

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In this paper we present a new algorithm to generate the reference signals to control the series and parallel power inverters in a unified power quality conditioner “UPQC” to enhance power quality. The algorithm is based on the instantaneous power tensor formulation which it is obtained by the dyadic product between the instantaneous vectors of voltage and current in n-phase systems. The perfect harmonic cancellation algorithm “PHC” to estimate the current reference in a shunt active power filter was modified to make it hardy to voltage sags through unit vector template generation “UVGT” while from the same algorithm it extracts the voltage reference for series active power filter. The model was validated by mean of simulations in Matlab-Simulink®.

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Shraddha, Bele, and Ghutke Pratik. "Generalized Unified Power Quality Conditioner UPQC System with an Improved Control Method Under Distorted and Unbalanced Load Conditions." International Journal of Trend in Scientific Research and Development 3, no. 4 (2019): 262–70. https://doi.org/10.31142/ijtsrd23659.

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This paper deals with the power quality condition which is the integration of the series active and shunt active filter the main concept is that while considering the harmonic distortion or the voltage mitigation problem of the device UPQC usually compensate various element of the power system which has a negative impact on the system by eliminating it UPQC is a reliable device due to its nominal cost and fast response with low error handing capabilities. Whenever we consider any transmission and distribution system there are many electrical loads which are very important for the facing of the voltage variation .This paper present a novel method through which we will developing a control method for shunt active filter and PQ theory based control technique for series active filter to compensate power problem in a 3 phase four wire UPQC .The purpose UPQC will improve the power quality of power distribution system under balanced and distorted load condition. The control scheme used is the hysteresis voltage controller by using a b c to d q transformation. Shraddha Bele | Pratik Ghutke "Generalized Unified Power Quality Conditioner (UPQC) System with an Improved Control Method Under Distorted and Unbalanced Load Conditions" Published in International Journal of Trend in Scientific Research and Development (ijtsrd), ISSN: 2456-6470, Volume-3 | Issue-4 , June 2019, URL: https://www.ijtsrd.com/papers/ijtsrd23659.pdf

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Garcés Gómez, Yeison Alberto, Nicolás Toro García, and Fredy Edimer Hoyos. "Unit vector template generator applied to a new control algorithm for an UPQC with instantaneous power tensor formulation, a simulation case study." International Journal of Electrical and Computer Engineering (IJECE) 10, no. 4 (2020): 3889. http://dx.doi.org/10.11591/ijece.v10i4.pp3889-3897.

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In this paper we present a new algorithm to generate the reference signals to control the series and parallel power inverters in an unified power quality conditioner “UPQC” to enhance power quality. The algorithm is based in the instantaneous power tensor formulation which it is obtained by the dyadic product between the instantaneous vectors of voltage and current in n-phase systems. The perfect harmonic cancelation algorithm “PHC” to estimate the current reference in a shunt active power filter was modified to make it hardy to voltage sags through unit vector template generation “UVGT” while from the same algorithm it extracts the voltage reference for series active power filter. The model was validated by mean of simulations in Matlab-Simulink®.

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Selvam., P., and R. Boopathi. "An Dynamic Voltage Regulator For HVDC System On Low Power DC Line With Series Active Power Filter And Reducing Repulsion To The Transmitting Station." Journal of Switching Hub 4, no. 2 (2019): 16–21. https://doi.org/10.5281/zenodo.3046201.

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Harmonics in HVDC power systems, which are caused by highly non-linear devices, affect its performance. Therefore, the main concern of power engineers in power system design and operation have been controlling and eliminating such repulsion. In respect of this, HVDC power system repulsion analysis is, therefore, imperative in power system planning, control and operation. It is worthy of note that, different alternatives of filter design should be considered before making final decision on filter Configuration. In this paper the reduction of harmonics in the HVDC power transmission system by implementing the active power filter. Also the power factor is increased drastically by reducing the current harmonics in the load side. The solar PV output can be presented and analyzed with help of boost converter in order to proof that the solar output voltage can be increased by the boost converter. The series active power filter appears to be a viable solution for eliminating repulsion currents and current transient condition. Shunt active power filter compensates current by injecting equal voltage compensation is created by nonlinear loads.

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de Almeida Carlos, Gregory Arthur, Cursino Brandao Jacobina, Euzeli Cipriano dos Santos, Edgard Luiz Lopes Fabricio, and Nady Rocha. "Shunt Active Power Filter With Open-End Winding Transformer and Series-Connected Converters." IEEE Transactions on Industry Applications 51, no. 4 (2015): 3273–83. http://dx.doi.org/10.1109/tia.2015.2394318.

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Parkatti, Perttu, Mika Salo, and Heikki Tuusa. "Control and Performance of Shunt Current Source Active Power Filter with Series Capacitor." EPE Journal 20, no. 2 (2010): 49–56. http://dx.doi.org/10.1080/09398368.2010.11463759.

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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 (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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Swain, Sushree Diptimayee, Pravat Kumar Ray, and K. B. Mohanty. "Design of Passive Power Filter for Hybrid Series Active Power Filter using Estimation, Detection and Classification Method." International Journal of Emerging Electric Power Systems 17, no. 3 (2016): 363–75. http://dx.doi.org/10.1515/ijeeps-2015-0190.

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Abstract This research paper discover the design of a shunt Passive Power Filter (PPF) in Hybrid Series Active Power Filter (HSAPF) that employs a novel analytic methodology which is superior than FFT analysis. This novel approach consists of the estimation, detection and classification of the signals. The proposed method is applied to estimate, detect and classify the power quality (PQ) disturbance such as harmonics. This proposed work deals with three methods: the harmonic detection through wavelet transform method, the harmonic estimation by Kalman Filter algorithm and harmonic classification by decision tree method. From different type of mother wavelets in wavelet transform method, the db8 is selected as suitable mother wavelet because of its potency on transient response and crouched oscillation at frequency domain. In harmonic compensation process, the detected harmonic is compensated through Hybrid Series Active Power Filter (HSAPF) based on Instantaneous Reactive Power Theory (IRPT). The efficacy of the proposed method is verified in MATLAB/SIMULINK domain and as well as with an experimental set up. The obtained results confirm the superiority of the proposed methodology than FFT analysis. This newly proposed PPF is used to make the conventional HSAPF more robust and stable.

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Hou, Rui, Pengfei Wang, Jian Wu, and Dianguo Xu. "Research on Oscillation Suppression Methods in Shunt Active Power Filter System." Energies 15, no. 9 (2022): 3125. http://dx.doi.org/10.3390/en15093125.

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The shunt active power filter (SAPF) system oscillation is a massive threat to the security and stability of the power grid. This study classifies SAPF oscillation into two categories according to the difference in mechanisms. The SAPF oscillation in one category is caused by the resonant characteristics of a switching noise filter and is called external loop amplification. The SAPF oscillation in the other category is induced by the presence of a capacitor in the load current for SAPF and is called self-excited oscillation. Unlike previous studies, this study tried to reveal the internal relationship between the two kinds of SAPF oscillation, present a general shunt virtual-damping-based SAPF oscillation suppression strategy covering the previous resonant damping method, and provide the discrete domain stability criterion of the control system. The sampling frequency was at least six times the resonant frequency. The stability region was enlarged with an increase in the sampling frequency and narrowed with a rise in the resonant frequency. As to the harmful self-excited oscillation problem, this study proposes a composite control strategy combining selective harmonic compensation and grid-side current feedback. Moreover, this study considers the more general resistance–inductance–capacitance load situations and analyzes the stability of the SAPF–Thyristor Switched Capacitor (TSC) hybrid compensation system. Simulations and experiments demonstrated that the proposed compound control method can reduce the primary harmonics of the system by more than 90% and has a better oscillation suppression performance than previous suppression methods. In particular, if we selected the TSC series reactance rate following more than 6%, self-excited oscillation could usually be avoided.

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Hou, Rui, Pengfei Wang, Jian Wu, and Dianguo Xu. "Research on Oscillation Suppression Methods in Shunt Active Power Filter System." Energies 15, no. 9 (2022): 3125. http://dx.doi.org/10.3390/en15093125.

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The shunt active power filter (SAPF) system oscillation is a massive threat to the security and stability of the power grid. This study classifies SAPF oscillation into two categories according to the difference in mechanisms. The SAPF oscillation in one category is caused by the resonant characteristics of a switching noise filter and is called external loop amplification. The SAPF oscillation in the other category is induced by the presence of a capacitor in the load current for SAPF and is called self-excited oscillation. Unlike previous studies, this study tried to reveal the internal relationship between the two kinds of SAPF oscillation, present a general shunt virtual-damping-based SAPF oscillation suppression strategy covering the previous resonant damping method, and provide the discrete domain stability criterion of the control system. The sampling frequency was at least six times the resonant frequency. The stability region was enlarged with an increase in the sampling frequency and narrowed with a rise in the resonant frequency. As to the harmful self-excited oscillation problem, this study proposes a composite control strategy combining selective harmonic compensation and grid-side current feedback. Moreover, this study considers the more general resistance–inductance–capacitance load situations and analyzes the stability of the SAPF–Thyristor Switched Capacitor (TSC) hybrid compensation system. Simulations and experiments demonstrated that the proposed compound control method can reduce the primary harmonics of the system by more than 90% and has a better oscillation suppression performance than previous suppression methods. In particular, if we selected the TSC series reactance rate following more than 6%, self-excited oscillation could usually be avoided.

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Fujita, Hideaki, and Hirofumi Akagi. "Combined system of a series active filter and a shunt passive filter—an optimum design of the shunt passive filter." Electrical Engineering in Japan 113, no. 2 (1993): 91–101. http://dx.doi.org/10.1002/eej.4391130208.

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Koledowo, S. O., E. C. Ashigwuike, and A. Bawa. "A study of ferroresonance in underground distribution network for 15MVA, 33/11 kV injection substation." Nigerian Journal of Technology 39, no. 1 (2020): 219–27. http://dx.doi.org/10.4314/njt.v39i1.25.

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This provides an overview of ferroresonance phenomena, modeling aspects and practical experience in recognizing and mitigating the effect of ferroresonance in the power network. In particular, we will present symptoms of ferroresonance. In this study, ferroresonance phenomenon are investigated under the modelling of the underground cable of 15 MVA, 33/11/0.415 kV with four feeders supply over 31 distribution transformers of Garki 1 service unit, Abuja, conducted using MATLAB/SIMSCAPE software package. The network is subjected to switching resulting in the formation of a series LC combination prone to ferroresonance. The waveforms and total harmonic distortion charts obtained are observed, analyzed and then used to design Harmonic filters which have been implemented to mitigate ferroresonance in the network. The simulated ferroresonance phenomenon was suppressed using Shunt Active Harmonic Filter connected in parallel to the network. A reduced harmonic content and dampened event when compared to a non-filtered event was observed. Application of Shunt Active Harmonic filter reduces ferroresonance effect by 67.743%. Keywords: Ferroresonance, Transformer, MATLAB/Simscape, Harmonic Distortion, Power system Modelling, Saturable inductor, Capacitance

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Chaiyaphun, Krittapas, Phonsit Santiprapan, and Kongpol Areerak. "A Modified Variable Power Angle Control for Unified Power Quality Conditioner in a Distorted Utility Source." Energies 17, no. 12 (2024): 2830. http://dx.doi.org/10.3390/en17122830.

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The distorted supply voltage degrades the control performance of a unified power quality conditioner (UPQC). This problem causes incorrect calculations in the harmonic identification and reference signal generation processes. This paper proposes a modified harmonic identification of the UPQC. The reference compensating current calculation for the shunt active power filter (shunt APF) is developed using the sliding window with the Fourier analysis (SWFA) method. In addition, the variable power angle control (PAC) is applied to operate the reference signal generation of the series APF and the shunt APF of the UPQC. Under the distorted voltage and nonlinear load conditions, the proposed approach can provide accurate reference compensating signals and successfully share the load reactive power compensation between the shunt APF and the series APF. In this work, a three-phase, three-wire power system with linear and nonlinear loads was implemented. The proposed method was validated using the processor-in-the-loop technique on an eZdsp™ F28335 board and the MATLAB/Simulink program. The testing results indicated that SWFA has excellent filtering performance and enhances harmonic identification compared to the operation without any filter or with low pass filters (LPF). With the proposed approach, the percentage of total harmonic distortion of voltage and current could be maintained within the IEEE519-2022 standard, and the magnitude of the RMS voltage across the load was in the recommended range specified by ANSI C84.1-2016.

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Pratap, Gudala Satya, and Dr Midhunchakkaravarthy. "Control of Solar Photovoltaic Integrated Universal Active Filter Using Artificial Intelligence Technique." INTERANTIONAL JOURNAL OF SCIENTIFIC RESEARCH IN ENGINEERING AND MANAGEMENT 08, no. 09 (2024): 1–5. http://dx.doi.org/10.55041/ijsrem37475.

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This paper organizes, a different technique based on adaptive filtering is proposed for the control of three phase worldwide active power filter with a solar photovoltaic array integrated at its DC bus. Two adaptive filters along with a zero crossing detection method are used to remove the magnitude of fundamental active component of distorted load currents, which is then used in estimation of reference signal for the shunt active filter. This technique enables extraction of active component of all three phases with reduced mathematical computation. The series active filter control is based on synchronous reference frame theory and it regulates load voltage and maintains it in-phase with voltage at point of common coupling under conditions of voltage sag and swell. In this paper An artificial intelligence technique fuzzy logic controller is used. The performance of the system is evaluated on an MATLAB/SIMULINK software under various dynamic conditions such as sag and swell in voltage at point of common coupling, load unbalancing and change in solar irradiation intensity.

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CHENNAI, Salim. "Investigation on the Performance of UPQC System based on Five and Seven-level NPC Inverter Topologies." Electrotehnica, Electronica, Automatica 72, no. 2 (2024): 13–21. http://dx.doi.org/10.46904/eea.23.72.2.1108002.

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This article presents an investigation on the performance of unified power quality conditioner (UPQC) system based on five and seven-level neutral point clamped (NPC) inverters, using similar strategy to identified current or voltage references and analogue control approaches for switching pulses generation via combined phase disposition-sinusoidal pulse width modulation (PD-SPWM) and fuzzy logic control scheme. The UPQC system is adopted to compensate the current source harmonics and all voltage disturbances simultaneously. It is designed by the combination of series and shunt active power filters (APFs) connected by a common DC link capacitor. The DC voltage bus is maintained constant, using proportional integral voltage controller. The synchronous reference frame (SRF) detection method is used to get the shunt APF reference signals and the instantaneous reactive power (p-q) theory for the series APF. The shunt and series active power filter (APF) reference signals, derived from the control algorithm, are injected in fuzzy controllers to generate switching signals. The functionality of both UPQC systems is evaluated using Matlab-Simulink software and SimPowerSystem Toolbox in presence of various voltage disturbances. The numerical simulation results show the efficacy of proposed UPQC based on five and seven converter topologies and confirm the superiority of UPQC system using seven-level (NPC) inerter in term of harmonic current compensation compared to UPQC system based on five-level (NPC) topologies.

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Zafari, Ali, Mohammad Firoozian, Seyyed Jafar Fazeli Abelouei, and Ahmad Azadi Hematabadi. "Criteria for selection of current or voltage source converter in shunt active power filter structure." World Journal of Engineering 16, no. 5 (2019): 660–69. http://dx.doi.org/10.1108/wje-06-2019-0171.

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Purpose Votage source converter (VSC) based or current source converter (CSC) based shunt active power filter (SAPF)? It is the main question in harmonic elimination project using SAPF.This paper presents some criteria based on which the designer can decide which type of filter is more suitable for implementation of the project according to the nature and characteristics of the project. Design/methodology/approach Owing to the importance of cost and power losses criteria, relevant equations will be formulated and comparative analysis will be carried out between conventional structures based on CSC or VSC. For validation of analyses, simulation results have been studied in the MATLAB–SIMULINK environment. Findings Simulation results have examined two important criteria of power losses and costs. Although the results show the superiority of VSSAPF to CSSAPF in both criteria, this comparison is performed in a general and conventional condition. Using third-order filters of inductive-capacitive-inductive (LCL) type in VSSAPF, using insulated-gate bipolar transistor (IGBT) with reverse-voltage blocking ability in CSSAPF, which eliminates the need to use series diodes, and the use of superconducting technology in the DC-side endpoint in CSSAPF, not only reduce the difference of cost and losses in two schemes but also may lead to the lower costs and losses in CSSAPF than VSSAPF. Originality/value This paper is the result of many years working on active power filter and can be useful for engineers who are engaged in industrial projects.

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Prabha, Divya, and Lalit Jain. "Modified Recursive Least Square Algorithm for THD Reduction using Shunt Active Power Filter in Grid." SMART MOVES JOURNAL IJOSCIENCE 5, no. 2 (2019): 8. http://dx.doi.org/10.24113/ijoscience.v5i2.183.

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In industrial and utility power system it has been observed that harmonics build a major role in reducing the quality of power. These harmonics are caused because of increasingly utilize of nonlinear loads connected to the power system. In this context, active power filters play a very significant role for improvement in power quality. Moreover, at transmission ground, there is a high requirement to control reactive power and voltage stability. Conventionally, passive and active filters (shunt and series filters) were used for the development of power quality. But, they suffered from the issues like resonance, fixed compensation, and other heating networks are commonly addressed in the literature as one of the most effective solutions for decreasing the designed.

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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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HRISHIKANT, P.BALWATKAR, and A. P. KINGE PROF. "IMPLEMENTATION OF GRID INTERCONNECTION OF RENEWABLE ENERGY SOURCES AT DISTRIBUTION LEVEL WITH POWER QUALITY IMPROVEMENT FEATURES." JournalNX - a Multidisciplinary Peer Reviewed Journal 3, no. 7 (2017): 101–5. https://doi.org/10.5281/zenodo.1420952.

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The non-renewable energy sources are continuously used over the last several decades and the need of the time is to reduce their use. The researchers are working to study the feasibility of other sustainable sources of the energy. The challenge of the energy crisis has to be addressed and the researchers were contributing in this regards continuous. The requirement of the present time is to develop the non renewable energy systems in coordination with the grid. The grid interconnected non conventional sources have been facing the problems with the quality of power and feasibility. Authors have implemented the power quality improvement model for the grid connected system in order to enhance its performance. https://journalnx.com/journal-article/20150408

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Ramadevi, Alapati, Koganti Srilakshmi, Praveen Kumar Balachandran, Ilhami Colak, C. Dhanamjayulu, and Baseem Khan. "Optimal Design and Performance Investigation of Artificial Neural Network Controller for Solar- and Battery-Connected Unified Power Quality Conditioner." International Journal of Energy Research 2023 (April 11, 2023): 1–22. http://dx.doi.org/10.1155/2023/3355124.

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Nowadays, integration of renewable sources into the local distribution system and the nonlinear behavior of advanced power electronic equipment have made a large impact on the power quality (PQ). The unified power quality conditioner (UPQC) is a multifunctional FACTS device, which is a combination of both shunt active filter and series active filters via a common DC link. Presently, the artificial intelligence is playing a vital role in the development of the intelligent control methods. Traditional training methods of artificial neural network (ANN) like back propagation and Levenberg-Marquardt may get stuck in local optimal solution which leads to the invention of ANN trained optimally by metaheuristic algorithms. This paper develops a firefly algorithm-trained ANN (FF-ANNC) controller for the shunt active filter and proportional integral controller (PI-C) for the series active filter of the UPQC integrated with the solar energy system and battery energy storage via boost converter (B-C) and buck boost converters (B-B-C). The main aim of the proposed FF-ANNC is to reduce the mean square error (MSE) thereby achieving the constant DC link capacitor voltage (DLCV) during load and irradiation variations, reduction of imperfections in current waveforms, improvement in power factor (PF), and mitigation of sag, swell, disturbances, and unbalances in the grid voltage. The working of developed FF-ANNC was tested on five test studies with different types of loads and source voltage balancing/unbalancing conditions. However, to demonstrate supremacy of the suggested FF-ANNC, a comparative study with the training methods like genetic algorithm (GA) and ant colony optimization (AC-O) and also with other methods that exist in literature like PI-C, fuzzy logic controller (FL-C), and artificial neuro fuzzy interface system (ANFI-S) was conducted. The proposed method reduces the total harmonic distortion to 2.39%, 2.32%, 2.27%, 2.45%, and 2.66% which are lower than the existing methods that are available in literature. The FF-ANNC shows an excellent performance in reducing voltage fluctuations and total harmonic distortion (THD) successfully and thereby improving PF.

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Marks, J. H., and T. C. Green. "Predictive transient-following control of shunt and series active power filters." IEEE Transactions on Power Electronics 17, no. 4 (2002): 574–84. http://dx.doi.org/10.1109/tpel.2002.800970.

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Journal articles on the topic 'Active shunt and series active power filter'

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