Sliding Mode Control With Grid Voltage Modulated Direct Power Control for Three-Phase AC-DC Converter

In this study, a sliding mode control (SMC) based on the grid voltage modulated direct power control (GVM-DPC) is designed for a three-phase pulse-width modulated (PWM) AC-DC converter (rectifier) system. The GVM-DPC method makes the differential active and reactive power equations of the PWM rectifier system transform into a linear time-invariant system from a linear time-varying one. Thus, the conventional linear control techniques consisting of feedback and feedforward controllers are applicable to control active and reactive powers independently. The proposed method is guaranteed that the closed system is globally exponentially stable. In order to maintain a constant dc-link voltage, an SMC method is employed to generate the active power reference of the GVM-DPC method. From the simulation results, the proposed method improves the transient performance of the system and has a robust property to the parameter mismatch.