Mechanism analysis and experimental study of table-based direct power control

PWM rectifier controlled by direct power control (DPC) is characterized by the merits of quick response, no need of inner current tuning and strong robustness, etc. The switching table is the key point of DPC and many researches have been done in this field. However, most papers fail to give a clear interpretation on the mechanism of switching table. This paper gives a detailed analysis on the mechanism of the switching table by using mathematical derivation and geometry illustration. It is found that there are six kinds of feasible switching tables, among which three tables have been reported in the literature while other three not. The performance of the six kinds of tables are compared and their respective pros and cons are summarized. Selected simulation and laboratory experimental results are presented to confirm the feasibility of the six switching tables.