Sliding Mode Controller For Pulse Width Modulation Based DSTATCOM

In this paper, a controller is designed to achieve robust control for DSTATCOM which is controlled as a voltage source inverter utilizing pulse width modulation. DSTATCOM dynamic equations show that the nonlinearities of the DSTAT COM and uncertainties of the system model have large contribution in system dynamic response. Hence, a robust nonlinear control strategy based on sliding mode control, which is a standard approach to tackle the parametric and modeling uncertainties of a nonlinear system, is chosen for the control. For sliding mode controller, Lyaponov stability method is applied to keep the nonlinear system under control. The sliding mode approach is a method which transforms a higher-order system into first-order system. In that way, a simple control algorithm can be applied, this is very straightforward and robust. The simulation results show the ability of the proposed controller to give an enhanced performance at all operating points and with different load types