微网平滑切换的控制策略研究

Micro grid switching control strategy based on combination of three-loop decoupling feedback and synchronization control

微网在并网/孤岛2种模式间的平滑切换对微网安全稳定运行影响很大,储能元件可以维持微网孤岛运行时电压和频率的稳定,为此设计了一种包括功率环、滤波电感电流环以及滤波电容电压环与同步控制相结合的储能元件控制器,并分析了它在微网2种模式相互切换过程中的作用。利用Matlab/Simulink建立由储能元件、风电和光伏组成的微网系统并且建立了微网试验平台。仿真和试验结果证明该控制器能够维持微网2种模式相互切换过程中电压和频率的稳定,保障微网内负荷的电能质量。

Smooth switching between grid-connected operation mode and lslanclmg operanon moae is important for safe and stable operation of micro grid. Because energy storage element can maintain stable voltage and frequency of micro-grid in islanding operation, it is necessary to design an energy storage device controller. In this paper an energy storage controller, which combines a power loop,a filter inductor current loop and a filter capacitor voltage loop with a synchronous control is proposed and its switching procedure between two operation modes of micro grid is analyzed. A micro grid includes energy storage element, wind power and photovoltaie systems is established in Matlab/Simulink, then a micro grid experimental platform is completed. The simulation and experimental results show that controller can maintain stability of system voltage and frequency in the process of switching between two microgrid operation modes, can guarantee power quality of micro grid.