基于对等控制策略的微电网运行

为减小微电网对通信系统的依赖性,实现分布式电源和负荷的即插即用,结合微电网不同运行模式,研究了微电网对等控制策略。在对等控制策略中,分布式电源采用下垂控制,调节分布式电源的输出电压和频率;下垂控制器中的P-f和Q-U具有线性的下垂特性。建立了对等控制策略下的微电网运行模型,分析了并网和孤岛运行模式之间切换、孤岛模式下切/增负荷及孤岛模式下切/增微电源三种运行状况下的微电网运行特性,基于Matlab/Simulink仿真结果,研究了微电网母线电压、DG频率和功率的变化规律,验证了控制策略的正确性和可行性。

Operation control of microgrid based on peer-to-peer control strategy

To reduce the dependency of the microgrid on communication system and implement plug-and-play for distributed generators(DG) and loads, the peer to peer control strategies in the microgrid were studied by considering the different operation modes. The droop control method of the DG was studied in the peer-to-peer control strategy. The voltage and frequency of the DG were regulated according to the linear droop characters of P-f and Q-U in the droop controller. The operation model of the micro-grid was established based on peer-to-peer control strategy. The operation characteristics of the micro-grid were respectively analyzed in three operation modes, concluding the load changes mode and the DG changes mode in islanding as well as the switch mode between the grid-connected operation and the islanding operation. With the MATLAB/SIMULINK simulation results, the changing laws of the bus voltage, power and frequency of the microgrid were studied. The correctness and feasibility of the peer-to-peer control strategy were verified with the simulation results.