孤岛交流微网群中各微电网分布式有功–电压调控策略

Distributed active power-voltage regulation strategy for microgrids in islanded AC microgrid cluster

孤岛交流微电网群中,为维持各微电网的电压稳定并实现经济性分配有功功率,本文提出了一种分布式有功–电压调控策略.首先,针对电压调控目标,为各微电网的分布式电源和储能设备都设计了反下垂控制器和电压二次控制器以调节输出电压至期望的参考值;其次,针对有功分配目标,还提出了各微电网及其内部发电设备的出功准则,并基于边际成本一致理论,设计了一种基于电流调控的功率分配方法,以维持功率供需平衡并降低发电成本;最后,根据小信号模型理论,分析了上述策略对单个发电设备运行稳定性的影响,并基于MATLAB/Simulink软件进行了仿真验证.

For the islanded AC microgrid cluster,to maintain the voltage stability of each microgrid and share the active power economically,a distributed active power-voltage control strategy is proposed in this study.Firstly,in view of the target of voltage regulation,the P–U droop controller and the secondary voltage controller are designed,which are applied to adjust the output voltage to the reference value.In addition,the droop controller can be also used to maintain the controlled voltages at the desired value;secondly,in view of the target of active power sharing,the power output criteria of each microgrid is designed.Moreover,based on the marginal cost theory,the power sharing method using current adjustment is also designed to reduce generation cost.Finally,according to the small signal model theory,the influence of above strategies on the stability of energy resource is analyzed.The related simulation verification is carried out based on MATLAB/Simulink software.