p-q theory based modified control algorithm for load compensating using DSTATCOM

This paper proposes a control algorithm for DSTATCOM (Distributed STATic COMpensator) to compensate the source current harmonics in a non-sinusoidal voltage source environment. A 3-leg VSC (voltage source converter) based DSTATCOM is used for the load compensation, on a system consisting balanced 5^th harmonic PCC voltages, in 3-phase, 4-wire distribution system. Simulations are performed in MATLAB^® environment for two load conditions, i.e., (i) a 3-phase non-linear load (NLL), and (ii) a NLL with reactive load. The results show that the proposed modification in the p-q theory control algorithm allows successful harmonic compensation at load side.