Coordinated Control of SVC and TCSC for Voltage Profile Improvement employing Particle Swarm Optimization

Abstract

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...

Application and control of flexible alternating current transmission system devices for voltage stability enhancement of renewable-integrated power grid: A comprehensive review

“…The findings illustrated the effectiveness of the proposed methods. Also, PSO technique was applied in [67] to design SVC and TCSC coordinated parameters in order to achieve voltage profile improvement. The method was evaluated on IEEE 9-bus system using MATLAB.…”

Lead Lag Controller of TCSC Optimized by Bees Algorithm for Damping Low Frequency Oscillation Enhancement in SMIB

“…The structure of lead-lag controller is used as the damping controller of TCSC. Power system utilities preferred this type of controller due to its easiness in on-line tuning and also lack of assurance of the stability by some adaptive or variable structure techniques [9]. As FACTS device has ability to damp power oscillation, the conventional lead-lag controller structure is usually used in the study.…”

“…Thyristor-controlled series capacitor (TCSC) is one of the FACTS family that has increasingly applied with long transmission line. It have various roles in the operation and control of power system [6,7,8,9]. In recent years, researchers have showed interest in designing TCSC with power-oscillation-damping (POD) controller in order to enhance the smallsignal stability.…”

Optimal Voltage Compensation of Small Hydropower Grid Linked Structure Centered on PV-STATCOM Smart Inverter

“…During voltage sag, Particle Swarm Optimization and Ant Colony Optimization techniques were used to get the flexible proportional integral parameter modification needed to improve STATCOM's dynamic behaviour. To improve voltage profile, the PSO technique was utilised to propose TCSC and SVC coordinated parameters in [33]. MATLAB was utilized to evaluate the method on an IEEE 9-bus system.…”