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针对微电网在孤岛运行状况下的功率分配问题,采用小信号状态空间模型分析了传统静态下垂控制方法在功率分配以及动态稳定性方面的影响.为了弥补传统下垂控制方法的不足,提出了一种带有可控因子的、具有暂态下垂特性的新型功率分配控制策略,这种控制策略使系统从一个自由度变为两个自由度,同时使用极点配置技术,选择合适的暂态下垂增益.通过小信号分析,得出该种新型下垂控制方法不仅可以实现分布式电源(DG)之间精确的负荷分配,同时还能保证功率变化时微电网的动态特性.最后通过仿真分析,验证了新型下垂控制器对微电网的暂态响应具有很大的提升作用.
Aiming at the power distribution of microgrids under islanding operation, the effect of the traditional static droop control method on power distribution and dynamic stability is analyzed using a small-signal state-space model.In order to make up for the deficiencies of traditional droop control methods, a A new power distribution control strategy with controllable factor and transient droop makes the system change from one degree of freedom to two degrees of freedom and uses the pole placement technique to select the appropriate transient droop gain. Through the analysis of small signal, the new droop control method not only can realize the accurate load distribution between distributed DGs, but also can guarantee the dynamic characteristics of microgrid when the power changes.Finally, through the simulation analysis, The droop controller has a great effect on the transient response of the microgrid.