Direct power control with disturbance compensation for grid connected power converters - A discrete sliding mode approach

This paper presents a design of a direct power control using the discrete-time sliding mode control. The design is intended for a grid-connected inverter or a doubly fed induction generator. The constant switching frequency is implemented by the space vector modulation, having the modulation period equal to the sample period. The effects of the discretization and external disturbances are analyzed. To solve this problem, a power based disturbance compensator is proposed. Its digital hardware implementation is simple. The simulation results show that the designed control system has a better steady state performance and robustness than a non-compensated control system.