Nonlinear STATCOM Controller using Passivity-Based Sliding Mode Control

The passivity-based sliding mode (PBSM) approach has been used on designing static synchronous compensator (STATCOM) controller aimed at reactive power compensation and voltage regulation. The energy-dissipative properties of the proposed model derived in the synchronous d-q rotating frame are fully retained. The proposed controller design is separated into the inner loop and the outer loop controller. In the inner loop, passivity-based control is employed by using energy shaping and damping injection techniques to produce the proper switching function for voltage source converter (VSC)-based STATOCM. The load terminal voltage and the DC-side voltage dynamics are regulated via the outer loop controller cascaded to the inner loop controller. The outer loop control is employed by two sliding mode controllers to determine the appropriate current command. Simulation results are presented to show efficacy of the resulting PBSM controller with regard to voltage regulation and reactive power compensation