Control techniques for power quality improvement in delta connected load using DSTATCOM

Distribution Static Compensator (DSTATCOM) is a custom power device used for power quality improvement in distribution system. The control techniques applied to the DSTATCOM play a major role in its performance. This paper presents comparative study of the reference current generation techniques using voltage source converter based DSTATCOM for reactive power compensation, source current balancing and harmonic mitigation in delta connected load. Different control techniques such as Instantaneous reactive power theory, Synchronous reference Frame theory and Symmetrical component theory have been used in this paper. Reference currents generated by control techniques have been tracked by the compensator in a hysteresis band control scheme. Dynamic simulation of the DSTATCOM for different control strategies has been carried out in MATLAB/Simpower system environment. Simulation results demonstrate the performance and feasibility of various control techniques for DSTACOM.