Power quality improvement in the distribution system by interconnecting PV using hybrid DSTATCOM

Integration of renewable energy source is one of the major goals in smart grid technology. This paper proposes a pure wave distribution static compensator (PW-DSTATCOM) for achieving the grid interconnection of solar power without deteriorating the quality of power. This PW-DSTATCOM is a reactive power compensating device that improves the power quality of the distribution system. It reduces voltage sag, surge and flicker caused by rapidly varying reactive power demand. This paper presents the idea of incorporating a seven-level inverter as voltage source inverter (VSI) and inductor capacitor inductor (LCL) filter instead of inductor capacitor (LC) filter in PW-DSTATCOM. This seven-level inverter is used for solar energy conversion to make distortion less sinusoidal waveform and LCL filter is proposed for active damping. This arrangement reduces the total harmonic distortion (THD) as per IEEE 519 standard. The simulation results show that the THD of voltage is 3.00% and the current is 2.26% with the proposed method. It also enhances the system voltage stability due to ultra-fast response time. The costing and sizing of the filter is reduced considerably by using a seven-level inverter. MATLAB Simulation software is used to develop and simulate the proposed system.