Deadbeat direct power control of three-phase pulse-width modulation rectifiers

Abstract

Direct power control (DPC) is a powerful control scheme for three-phase AC/DC converters, because of its decoupled control of active/reactive power and quick dynamic response with simple structure. However, relative high-power ripples at steady state and variable switching frequency can be observed in conventional DPC. Furthermore, the harmonic spectrum of current is broad and not easy to be filtered. This study tries to improve the steady-state performance of conventional DPC by using deadbeat power control. Two kinds of deadbeat control methods are proposed and the first one aims to achieve deadbeat control of active power, whereas the second one aims to achieve deadbeat control of both active power and reactive power. Compared with conventional DPC, the two deadbeat power control methods achieve significant steady-state performance improvement in terms of lower power ripples and less current harmonics, even if the sampling frequency is much lower. Moreover, the quick dynamic response of conventional DPC is maintained in the proposed methods. The two kinds of deadbeat methods are comparatively studied, with the basic DPC as the benchmark. The presented experimental results validate the effectiveness of the proposed deadbeat power control methods.