Finite Control Set MPC based Distribution Static Compensator (DSTATCOM) for Load Compensation

Abstract

With the proliferation of nonlinear loads especially the power electronic loads, high harmonic content and poor power factor at the distribution end, the use of DSTATCOM (Distribution Static Compensator) for reactive power control is gaining immense popularity. This state-of-the-art dynamic shunt compensator has immense potential to solve many power quality problems in power distribution systems. The dynamic performance of DSTATCOM under nonlinear/ linear and unbalanced loads in 3-phase, 3-wire 415 V distribution system is studied using Simulink SimPowerSystem based simulation. The purpose of shunt compensator is to balance the supply side currents balanced and sinusoidal with unity power factor. The secondary control objective is to regulate the DC Voltage in order to incorporate for the losses in the inverter. Two control strategies, namely, Hysteresis based current control with Synchronous Reference Frame (SRF) theory based reference current extraction and Instantaneous Symmetrical Component Theory (ISCT) based reference current extraction are compared and their performance is evaluated. Here, we have implemented Finite Control Set-Model Predictive Controller (FCS-MPC) with Instantaneous Symmetrical Component Theory based reference current extraction method for DSTATCOM and compared its performance with the PI Controller. Also, the real time simulation of the proposed model is carried out with the help of OP5600 Real Time Digital Simulation Test Bed.