Parallel connected Multi-DSTATCOM for power quality improvement in distribution system

Abstract

Sending power with good quality is the main objective of electrical transmission system. The load nature, in particular non-linear loads, makes the current at the point of common coupling (PCC) to include harmonics which further affects the other loads connected at PCC. Power quality improvement and management is an important study for the enhancement of electrical transmission and distribution systems to enrich the quality of power delivered at the utilization point. DSTATCOM is one among the FACTS controllers to improve the power quality by nullifying the effect of harmonics at PCC. This paper presents the analysis of dual DSTATCOM topology. In this each DSTATCOM is burdened such that the total compensating currents is shared between the two. Dual STATCOM topology is tested and the result analysis is shown with varying non-linear type loading conditions. Dual DSTATCOM is controlled using Instantaneous Reactive Power theory control logic. Parallel DSTATCOM has the advantage of reduction of switch rating and switching losses. The simulation work is carried out using Matlab/Simulink software.