微电网控制策略分析研究

为了能够对微电网不同运行模式下分布式电源进行协调控制，在分析单个微电源3种控制方式的基础上，研究了微电网的2种综合控制策略：主从控制策略和对等控制策略。为了验证2种不同的控制策略能使微电网可靠运行，对微电网在并网状态和孤岛状态下及二者状态切换的运行特性进行仿真。通过Matlab仿真，对微电网运行中各DG的有功无功功率、母线电压和系统频率曲线的变化规律进行了分析，并对2种不同控制策略的正确性与可行性进行比较。仿真结果表明，2种控制策略都能实现微电网可靠运行，对等控制策略的稳定性高，但其还有许多关键技术问题尚未解决，因而就目前来说，主从控制策略的实用性更强。

Analysis and Research on Microgrid Control Strategies

To achieve the coordinated control of multiple distributed power sources in different operation modes, on the basis of analyzing three control modes of single micro source, this paper designs and studies two control strategies, namely including the master-slave control and the peer to peer control. In order to demonstrate the operation reliability of two different control strategies, two microgrid simulation systems are constructed, in which operation characteristics of the microgrid are respectively analyzed both in the grid-connected mode and the islanding mode as well as in the switching mode between the two. Finally, the changing laws of each DG power, bus voltage and frequency are obtained through the MATLAB simulation, and the correctness and feasibility of the two control strategies are proved and compared. The simulation results show that the two control strategies can achieve reliable operation of mierogrlds. Though the peer to peer control is of hifh stability, many key technical issues of its usage have not yet to be resolved, and thus the master-slave control is more practical at present.