Design and control of SVPWM based DSTATCOM for power quality improvement

In this paper, the performance of a Single DSTATCOM is evaluated for the purpose of harmonics elimination, reactive power compensation and load balancing. A control scheme has been proposed for DSTATCOM and its characteristics are investigated by digital simulation. A current controller on the single-phase basis forms the innermost loop in the control hierarchy. The dc bus voltage controller and PCC voltage controller are designed using a simplified model, neglecting the dynamics of the inner current control loop. The control of DSTATCOM is accomplished by Space Vector Pulse Width Modulation (SVPWM) technique with potential of supplying reactive power, harmonics and unbalanced load compensation and it is used to provide real component of load current, positive sequence and fundamental frequency. The Proportional-Integral (PI) controller is used to compute current component to compensate losses in DSTATCOM to maintain dc-bus voltage of voltage source converter (VSC).