Search query: reactive power compensator

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abstract: This paper discusses reactive power compensators from the point of stored energy in the capacitor, and proposes a single phase full bridge configuration of semiconductor switches to be used with reduced equipped capacitance for reactive power compensation. By applying this concept to shunt type static var compensator, a static synchronous compensator can be achieved with reduced sized capacitor. Additionally, the switching loss can be reduced due to its distinctive capacitor voltage waveform, which swings at the double of the line frequency. Modulation technique and capacitor voltage control method based on the reduced capacitance and high voltage ripple in the capacitor are proposed. The concept and control method were confirmed with small scale experiments.
author_names: Takanori Isobe

Daisuke Shiojima

Kyohei Kato

Yoel Raul Rosales Hernandez

Ryuichi Shimada
title: Full Bridge Reactive Power Compensator With Minimized Equipped Capacitor and Its Application to Static Var Compensator
venue: IEEE Transactions on Power Electronics
year: 2016

abstract: This paper presents a thyristor controlled LC (TCLC) compensator for dynamic reactive power compensation in a smart grid system. Compared with the traditional static var compensators like a fixed capacitor thyristor controlled reactor (FC TCR) which generates low order harmonic currents, the proposed TCLC can significantly mitigate the injection of harmonic currents. In this paper, the design of the TCLC parameters is investigated with the considerations of its reactive power compensation range and harmonic currents rejection. And a control method based on the generalized instantaneous reactive power theory is proposed. Moreover, representative simulation and experimental results of the proposed three phase three wire TCLC are presented to show its effectiveness in dynamic reactive power compensation in comparison with the traditional FC TCR and parallel combination of FC TCR and passive power filter.
author_names: Lei Wang

Chi-Seng Lam

Man-Chung Wong
title: Design of a Thyristor Controlled LC Compensator for Dynamic Reactive Power Compensation in Smart Grid
venue: IEEE Transactions on Smart Grid
year: 2017

abstract: Efficient use of fuel and energy resources is a high priority area in the energy development strategy of railway transport up to 2030 adopted by OAO Russian Railways. Currently, ac electric locomotives with power rectifier inverter transformers make up the majority of the usable fleet, in the range of 0.65 to 0.85. This is a cause of not only significant energy losses in the network of traction energy supply, but also restrictions affecting the speed of the locomotive. The energy characteristics of ac electric locomotives can be imptoved via compensation of the reactive power component. The reactive power compensator consists of series connected capacitor C and inductance L connected to the secondary winding of the transformer. The LC circuit parameters are calculated for reactive power compensation of an electric locomotive in the nominal operation mode. In this article, a reactive power compensation device for electric locomotive made based on a regulated passive compensator was considered. The management of reactive power compensator is carried out by means of extreme control method. It is shown that the extreme control method for a reactive power compensator does not provide for direct calculation of the reactive power of an electric locomotive and significantly simplifies the management structure of a reactive power compensator.
author_names: Yu M Kulinich

S A Shukharev
title: Application of an extreme control system to operate the reactive power compensator of an electric locomotive
year: 2016

abstract: This paper describes about control and design principles for SVC MERS, a new reactive power compensator using MERS (magnetic energy recovery switch) Low capacitance of dc capacitor and reduced loss and electromagnetic noise due to line frequency switching are advantages of this system. The capacitor voltage waveform generated by SVC MERS changes according to operating points because of the small capacitor. Operation mode is separated into three types by its waveform. This paper suggests control method for each mode. By using all waveform modes, SVC MERS obtains wide variation of reactive power generation. Then characteristics of each mode are described and evaluated to discuss the design principle including available operation range. Finally, results of experiments to confirm the concept including control and design principles are shown.
author_names: Daisuke Shiojima

MiaoMiao Cheng

Takanori Isobe

Ryuichi Shimada
title: Control and design principle of SVC MERS A new reactive power compensator with line frequency switching and small capacitor
venue: 2012 IEEE Energy Conversion Congress and Exposition (ECCE)
year: 2012

abstract: The role of the transmission network in the Power System is to transmit the power generated in the power plants to the load centers and the interconnected power systems. The transmission of electric power has to take place in the most efficient way in addition to providing flexibility in the process. Flexible A.C. Transmission System (FACTS) promotes the use of static controllers to enhance the controllability and increase the power transfer capability. Providing reactive shunt compensation with shunt connected capacitors and reactors is a well established technique to get a better voltage profile in a power system. Shunt capacitors are inexpensive but lack dynamic capabilities, thus some form of dynamically controlled reactive power compensation becomes essential. This feature is provided by Static VAR Compensator (SVC) The work presented here also compares SVC with fixed capacitor compensation and documents the superiority of SVC using Computer Simulation and its performance for reactive power management and better voltage control.
author_names: Pravin Chopade

Marwan U Bikdash

Ibraheem Kateeb

A D Kelkar
title: Reactive power management and voltage control of large Transmission System using SVC (Static VAR Compensator)
venue: 2011 Proceedings of IEEE Southeastcon
year: 2011

abstract: This paper proposes a wireless power transfer system using a series compensator GCSC as a primary side capacitor. The GCSC is a circuit module that equivalently functions as a series variable capacitor by controlling semiconductor switches. The advantage of applying the GCSC to a primary side capacitor is giving a controllability of power factor for a high frequency inverter. Therefore, the optimum operation of the high frequency inverter can be achieved regardless of the coil parameters. Experimental results with an 1 kW laboratory prototype confirmed that the proposed system can achieve an optimum operation and high efficiencies of the high frequency inverter.
author_names: Junichiro Osawa

Takanori Isobe

Hiroshi Tadano
title: Efficiency improvement of high frequency inverter for wireless power transfer system using a series reactive power compensator
venue: 2017 IEEE 12th International Conference on Power Electronics and Drive Systems (PEDS)
year: 2017

abstract: The dynamic result of static synchronous series compensator is presented in this paper. A voltage source inverter equipped with a dc source is used as an SSSC (static synchronous series compensator) to examine the effect of this device in controlling the power flow through transmission line. This device works not only as a reactive power compensator but has the ability of supplying and absorbing active power from the transmission line. In control system of SSSC two closed loops are used for both active and reactive power. In addition to reactive power compensation, SSSC also provides voltage profile improvement in system. Simulation results for different conditions are also described.
author_names: Poojan Nagar

Shawet Mittal
title: Reactive Power Compensation by Static Synchronous Series Compensator
venue: 2016 International Conference on Micro Electronics and Telecommunication Engineering (ICMETE)
year: 2016

abstract: The time varying nature of electric arc furnace (EAF) gives rise to voltage fluctuations which produce the effect known as flicker. The ability of static VAr compensator (SVC) is limited by delays in reactive power measurements and thyristor ignition. In order to improve the SVC performance, this paper presents a technique for prediction of EAF reactive power for a half cycle ahead. This technique is based on Artificial Neural Networks (ANNs) The procedure uses huge field data, collected from eight arc furnaces in Mobarakeh Steel Industry in Iran. About 90% of the recorded data are used for training the ANN and the rest are used in the test procedure. The performance of the compensator under the case of employing the predicted fundamental reactive power of EAF is compared with that for conventional method by using four indices which are defined based on concepts of flicker frequencies and power spectral density.
author_names: Haidar Samet

Mahdi Farhadi

Mohammad Reza Banaeian Mofrad
title: Employing Artificial Neural Networks for prediction of electrical arc furnace reactive power to improve compensator performance
venue: 2012 IEEE International Energy Conference and Exhibition (ENERGYCON)
year: 2012

abstract: Semiconductors have many applications in industry environment. In power systems they are used as switching devices. This paper concentrates on one of the widely used switching device Thyristor and its application for the analysis of Thyristor Controlled Reactor TCR as a reactive power compensator. The TCR circuit will be investigated by carrying out theoretical mathematical analysis, software simulation and practical work. The results will be compared and discussed and conclusions will be delivered.
author_names: Md Imran

S Azeez
title: Analysis of TCR as a reactive power compensator
venue: 2015 IEEE Asia Pacific Conference on Postgraduate Research in Microelectronics and Electronics (PrimeAsia)
year: 2015

abstract: A new approach for static reactive power compensation has been presented in this paper. Conventional thyristor controlled Static VAr Compensators (SVC) have inherent disadvantages like slow response times and poor harmonic performance as these FACTS devices are based on slow switching power electronics devices. Alternately, Pulse Width Modulated (PWM) dc ac inverters and direct ac ac converter structures offer higher bandwidth and push the spectral content to higher switching frequencies that are easier to filter. However, the application space of this approach is limited by the low voltage blocking capability of power devices employed in these converters. A center point clamped ac ac direct power converter has been reported recently in literature which operates on the principle of neutral point clamped dc ac inverter. By clamping the grid voltage to its mid point, the center point clamped converter structure reduces voltage stress on the bi directional switches by 50% Compared to the conventional two level and multilevel dc ac inverters, the proposed compensator based on direct ac ac conversion has a simpler structure and control. The operating principle as well as dynamic analysis for the proposed VAr compensation approach has been presented in the paper. A feedback controller has been designed for closed loop control. Simulation results presented in the paper verify that proposed converter offers better control of reactive power, retrofit capability, and reduced voltage stress on the bi directional switches. Furthermore, it has been shown that leading and lagging reactive compensation can be accomplished with a smooth control of the reactance through duty cycle modulation.
author_names: Pankaj Bhowmik

Somasundaram Essakiappan

Madhav D Manjrekar
title: State space analysis and duty cycle control of a switched reactance based center point clamped reactive power compensator
venue: 2016 IEEE Applied Power Electronics Conference and Exposition (APEC)
year: 2016