微电网中并列运行逆变器控制策略研究

考虑到微网内分布式电源的多样化和分散性，提出一种PQ控制与基于下垂特性的电压电流控制相结合的控制策略。PO控制可以实现间歇性微源的最大能源利用率，基于下垂特性的电压电流控制在微网运行模式或结构发生变化时，可以很好地实现负荷功率共享，以维持微网频率和电压的稳定。此控制策略既可以在并网模式下运行，也可以在孤岛模式下运行。并在PSCAD／EMTDC仿真平台上搭建了微电网仿真模型，验证了此控制策略的正确性和有效性。

Control Strategy of Parallel Inverter in Microgrids

Considering diversity and dispersibility of DGs in microgrid, this paper presents a PQ control strategy combined with droop control strategy based on voltage-current control. The PQ strategy can realize the maximum energy utilization rate of intermittent micro-sources and the voltage-current control based on droop control strategy can effectively realize power sharing in order to maintain the stability of the microgrid voltage and frequency when the micro network operation mode or structure changes. The proposed control strategy can not only run in grid mode but also in islanded mode. Based on the PSCAD/EMTDC platform, the micro grid simulation model is built and the results validate the effectivity of the proposed strategy.