微电网主/从控制策略的分析研究

在考虑微电源类型差异性和负荷分散性的基础上,结合微电源的两种不同运行模式,采用主/从控制策略,即将恒功率控制(PQ控制)和恒压、恒频控制(V/f控制)结合起来对微电网进行控制.在并网模式下,采用PQ控制,实现微电源对参考有功和无功的控制；在孤岛模式下,采用V/f控制,为微电网运行提供稳定的频率支撑.为了验证所设计的主/从控制策略能使微电网可靠运行,对微电网在联网运行模式和孤岛运行模式之间切换,以及孤岛模式下切/增负荷两种运行状况下的运行特性进行分析.通过Matlab仿真,对微电网母线电压、系统频率和功率的变化规律进行分析,证明了本文所设计的主/从控制策略的正确性和可行性.

Research on Master-Slave Control Strategy of Microgrid

Considering the different types of micro sources and the decentralization of loads and combined with the two different operation modes, master-slave control strategy, namely constant power control （PQ control） and constant voltage constant frequency control （V/f control）, was used to control the microgrid. In the grid-connected mode, PQ control could maintain the micro sources to export reference active and reactive power. In the islanding mode, V/f control could be used to provide stable frequency support for the microgrid operation. In order to demonstrate the operation reliability of the master-slave control strategy, the operation characteristics of the microgrid were respectively analyzed when it switched between the grid-connected mode and the islanding mode as well as runs with load changes in islanding. By the Maflab simulation, the changing laws of the microgrid＇s bus voltage, power and frequency were obtained. And the simulation resuhs prove the correctness and feasibility of the master-slave control strategy.