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For traditional direct power control strategy, there exist high steady-state power ripples and large current harmonics. To solve this problem, this work proposes a novel three-vector-based direct power control strategy for three-phase voltage source pulse-width-modulated (PWM) converters. Different from traditional predictive direct power control strategy, an improved vector table is presented and three voltage vectors are selected, which considers the impact of voltage vectors on the active and reactive power simultaneously. The performance of the three-phase voltage source PWM converters with the proposed control strategy is investigated and compared with the predictive deadbeat direct power control strategy. Furthermore, the three-phase voltage source PWM converters have also been tested in the condition of different loads and when voltage unbalance occurs. Simulation and experimental work are conducted. The results conclude that the proposed strategy is of simple structure and fast dynamic response. Besides, it can effectively reduce steady-state power ripples and current harmonics, improving the performance of the three-phase PWM converters. 22. Cheng P, Nian H. Direct power control of voltage source inverter in a virtual synchronous reference frame during frequency variation and network unbalance. IET Power Electronics 2016; 9(3):502-511. 23. Ma JP, Song WS, Wang SL, Feng XY. Deadbeat predictive direct power control of single-phase three-level pulse rectifiers. Proceedings of the CSEE 2015; 35(4):935-943. 24. Zhang YC, Xie W, Zhang YC. Deadbeat direct power control of three-phase pulse-width modulation rectifiers.

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