新型直接功率控制并网逆变器

New type direct power controlled grid-connected inverter

为了提高分布式发电系统的并网运行质量,基于电流重构技术,设计了直接功率控制的并网逆变器。该设计由SVPWM控制原理,得到母线电流与三相逆变电流的对应关系,通过引入新型电压矢量作用算法,实现了全区域的逆变电流重构。验证实验在并网功率为1000 W、采样频率为10 kHz的小功率实验平台上进行,结果表明:该设计理论算法正确,电流重构效果良好,能够保证发电系统的可靠运行。

This paper is an effort to improve the quality of grid-connected operation of the distributed power generation system by designing a grid-connected inverter of direct power controlled, based on the current reconstruction technique. The design makes possible the relationship between de-bus current and three phase inverting currents, depending on the SVPWM control principle. The current reconstruction in whole region is realized by introducing a new type algorithm of voltage vectors operation. An experiment done on a low power experimental platform with the grid-connected power in 1 000 W and the sampling frequenee in 10 kHz proves that the design exhibits correct theory algorithm, and better current reconstruction effect, and it can ensure reliable operation of the power-generating system.