Abstract-Flexible AC transmission system (FACTS) devices are widely used in power system. They have characteristics to perform faster and can solve many problems in power system study. With regards to this, a particle swarm optimization (PSO) algorithm is applied so that to design the coordinated parameters of static VAR compensator (SVC) and Thyristor Controlled Series Capacitor (TCSC) is presented here. With behavioural nonlinearities of the power system, linear methods cannot be used to design coordinated parameters of controllers. Simulations has been done on IEEE (WSCC) 9 bus power system in MATLAB and its toolboxes. The results are compared and found that coordination of FACTS devices with each other confirm the efficiency of the proposed method for improving the voltage profile. When operation of TCSC is constrained by some limitation, adjustable SVC can supply auxiliary support to improve the overall performance. Keyword -Static Var Compensator (SVC), Power System Stabilizer (PSS), Particle Swarm optimization (PSO), Coordination I. INTRODUCTION Flexible ac transmission system controllers have ability to extend the power transfer capability and also to enhance the stability within given limits, along with improvements in power system operation [3]. Voltage stability has been seen as a steady state problem involving static power flow studies for analysis. The voltage at various buses, the flow of active and reactive power, etc. keep on changing. It is understood that the FACTS controller will normally be equipped with higher order controllers such as power swing damping controller, Sub Synchronous Resonance (SSR) damping controller etc. Still to develop an insight, the FACTS controller is assumed to be equipped with simple PI controller only [1]. For improvement in operation of power system kind of interaction can occur amongst different types of FACTS controllers, which may include the interaction of stabilizers and High voltage DC (HVDC) controllers, too. It is categorized on the base of different frequency ranges. The term coordination haven't a meaning for centred control; instead, it understood that the tuning of the FACTS controllers will be done together for ensuring the promising, positive improvement of the overall control scheme. It is implied that the each controller depends chiefly on measure of topically useable quantity. It will act separately on connected FACTS devices. The TCSC is an important component of FACTS (Flexible AC Transmission Systems). With the firing control of the thyristor, it can change its apparent reactance smoothly and rapidly. The TCSC is able to directly schedule power flow along desired paths and allow the system to operate closer to the line limits [9]. The SVC is a shunt compensation component. It is originally designed for voltage maintenance in power systems. Much as the TCSC, the SVC is also capable of flexible adjustment. In conventional methods, when performance of power system is normally linear, it is designed and engaged cautiously. In the occurrence of large...
This paper aims on improving the stability of a 9 bus power system under fault condition using coordination of FACTS device. Flexible A.C. transmission system (FACTS) can be regulated reliable with faster output and can improve local power grid status with control with appropriate control strategies in very small time period. Based on that, a particle swarm optimization (PSO) algorithm was executed, to design the coordinated parameter of static VAR compensator (SVC) and Thyristor Controlled Series Capacitor (TCSC). Simulation is performed on WSCC 9-bus system in MATLAB software. When 3 phase fault is applied near to generator, frequency and rotor angle changes accordingly. With coordinated control of FACTS devices with PSO has implemented both, near to its normal condition. PSO performed in this paper was structured on identifying the values of L and C of SVC and TCSC, for superior coordination.
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