Research on direct power control based on sliding mode control for vienna-type rectifier

This paper presents an improved direct power control (DPC) strategy based on sliding mode control (SMC) with dual-closed-loop for the Vienna-type rectifiers to improve dynamic response during both start-up and load step change periods and guarantee better performances in steady state. The SMC based DPC methodology can directly regulate the instantaneous active and reactive powers without transforming to synchronous rotating coordinate reference frame or tracking phase angle of grid voltage; the required rectifier's control voltages can be directly calculated by utilizing the nonlinear SMC scheme. Theoretically, active and reactive power flow can be controlled without ripple or cross coupling. Finally, a DSP-controlled 2.2kW Vienna-type rectifier is used to verify the better steady-state and dynamic performances of the proposed control scheme.

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