Current source converter based STATCOM: Operating principles, design and field performance

Mehta

Int. J. Simul. Multisci. Des. Optim.

2015

-This paper presents a novel method of realizing one of the custom power controllers, the distribution static synchronous compensator (D-STATCOM) using current source converter (CSC) topology. Almost all the custom power controllers such as dynamic voltage restorer (DVR), unified power quality conditioner (UPQC) including D-STATCOM are generally designed and implemented by using voltage source converters (VSC) and not much research publications with CSC based approach has been reported over the last one decade. Since the D-STATCOM is a current injection device, its performance can be improved when realized by a current-source converter which can generate a controllable current directly at its output terminals and offers many advantageous features. In this paper, an attempt has been made to study the performance of a CSC based D-STATCOM suitable for use in the power distribution system in order to mitigate voltage sag and improve power quality. The proposed model uses a three leg CSC whose switching strategy is based on sinusoidal pulse width modulation (SPWM). The model has been simulated in the Matlab/Simulink environment. The results of the simulation runs under steady state and dynamic load perturbation provide excellent voltage and current waveforms that support the justification of the proposed model.

“…The corner frequency should be chosen as small as possible for better performance of the filter circuit. The detailed design strategies of the LPF are available at [14].…”

Section: Design Of DC Link Reactor and Input Lpfmentioning

confidence: 99%

Section: Design Considerations Of Csc For D-statcommentioning

confidence: 99%

Current source converter based D-STATCOM for voltage sag mitigation

Mehta

Int. J. Simul. Multisci. Des. Optim.

2015

Archives of Electrical Engineering

“…This method finds the feedback gain matrix that reduces the cost function. One way of representing the quadratic cost function in mathematically for LQR formulation is below: (10) Here Q and R are the symmetric, non-negative definite weighting matrices. For the statespace representation of a given system as below:…”

Section: Lqr Controller Based Csc-statcom Designmentioning

confidence: 99%

“…By their inverter configuration, basic type of STATCOM topology can be realized by either a current-source converter (CSC) or a voltage-source converter (VSC) [3][4][5][6][7][8]. But recent research confirms several merits of CSC based STATCOM over VSC based STATCOM [9][10][11]. These advantages contain: $ high converter reliability, $ quick starting, $ inherent short-circuit protection, $ the output current of converter is directly controlled, $ in low switching frequency this reduces the filtering requirements compared with the case of a VSC, $ the dc-side reactor in the current-source converter has a longer lifetime than the dc-side capacitor in the voltage-source converter.…”

Section: Introductionmentioning

confidence: 99%

Optimal LQR controller in CSC based STATCOM using GA and PSO

Gupta¹,

Tripathi²

2014

Abstract:The static synchronous compensator (STATCOM) is the multipurpose FACTS device with the multiple input and multiple output system for the enhancement of its dynamic performance in power system. Based on artificial intelligence (AI) optimization technique, a novel controller is proposed for CSC based STATCOM. In this paper, the CSC based STATCOM is controlled by the LQR. But the best constant values for LQR controller's parameters are obtained laboriously through trial and error method, although time consuming. So the goal of this paper is to investigate the ability of AI techniques such as genetic algorithm (GA) and particle swarm optimization (PSO) methods to search the best values of LQR controller's parameters in a very short time with the desired criterion for the test system. Performances of the GA, PSO & ABC based LQR controllers are also compared. Applicability of the proposed scheme is demonstrated through simulation in MATLAB and the simulation results are shown an improvement in the input-output response of CSC-STATCOM.

“…[8,12,13]. By their inverter configuration, basic Type of STATCOM topology can be realized by either a current-source converter (CSC) or a voltagesource converter (VSC) [13][14][15][16][17]. But recent research confirms several merits of CSC based STATCOM over VSC based STATCOM [18][19][20].…”

Section: Introductionmentioning

confidence: 99%

Transient Stability Assessment of Two-Area Power System with LQR based CSC-STATCOM

Gupta

Tripathi

2015

Automatika

Original scientific paper A current source converter (CSC) based static synchronous compensator (STATCOM) is a shunt flexible AC transmission system (FACTS) device, which has a vital role as a stability support for small and large transient instability in an interconnected power network. A robust linear quadratic regulator (LQR) based controller for CSC-STATCOM is proposed. In this paper, LQR based CSC-STATCOM is designed to enhance the transient stability of two-area two-machine power system. First of all, modeling & LQR based controller design for CSC-STATCOM are described. After that, the impact of the proposed scheme on the test system with different disturbances is demonstrated. The feasibility of the proposed scheme is demonstrated through simulation in MATLAB and the simulation results show an improvement in the transient stability of power system with CSC-STATCOM. Also, the robustness and effectiveness of CSC-STATCOM are better rather than other shunt FACTS devices (SVC & VSC-STATCOM) in this paper.