A Critical Evolution of Multifunctional DSTATCOM for Power Quality Improvement and Grid Integration of RES in Distribution System

Power quality issues and demand-power supply requirements are the two major problems that worry power sector. Non-linear loads deteriorate the power quality inducing harmonics into the source currents and dynamic load nature causes threat to the power system and insists to meet power demand. This paper presents the power quality issue addressing along with feeding active power from renewable source to power distribution system using dual inverter configuration in distribution system. In the proposed parallel (dual) inverter configuration in distribution system, one inverter acts as DSTATCOM filter to suppress source current harmonics injecting compensating signals and the other as DG inverter which converts DC supply (from renewable source - DG) to AC type to feed active power to distribution system. DSTATCOM is controlled from triggering pulses generated from SRF (synchronous reference frame) control theory and the Distributed Generation Integrated converter is controlled with simple ‘Id-Iq’ based control. The SRF theory for DSTATCOM and DG inverter control strategies are explained. Proposed system is developed and result analysis is presented using MATLAB/SIMULINK software.