Modelling, Analysis and Performance of a DSTATCOM for Unbalanced and Non-Linear Load

This paper describes the modeling and analysis of distribution static compensator (DSTATCOM), which is capable of balancing the source currents in spite of unbalanced and nonlinear load currents. In addition to balance the supply current, the power factor can be set to a desired value. The theory of instantaneous symmetrical components is used here to extract the three-phase reference currents. These reference currents are then tracked using voltage source inverter (VSI), operated in a hysteresis band control technique. The detailed simulation results are presented to support the concept. The two-level and three-level inverter topologies are used to realize the compensator. It is demonstrated that three level inverter gives less total harmonic distortion (THD) in source currents as compare to two level inverter