Power quality enhancement by current controlled Voltage Source Inverter based DSTATCOM for load variations

Abstract

In this paper, Distribution Static Compensator (DSTATCOM) is used for power factor correction, harmonics mitigation, and balancing of source currents in distribution system. In existing DSTATCOM control algorithms, dc-link voltage is maintained constant by dc voltage regulation loop (or PI controller), which give Ploss term of Voltage Source Inverter (VSI). In the proposed method, power quality improvement is achieved by DSTATCOM without dc-link voltage regulation loop. For that, the DSTATCOM parameters are designed in new approach. The main advantage of the proposed scheme is that, it will reduce the voltage sensing elements without affecting the compensation capability of DSTATCOM. Its performance is validated through matlab - simulink platform under various load conditions.