一种适用于微电网状态无缝切换的混合控制策略

针对传统微电源逆变器控制算法需要在微电网并网和孤岛运行时切换的弊端,提出一种适用于微电网无缝切换的混合控制策略。该混合控制策略算法可以同时支持并网和孤岛运行状态,消除了在微电网状态切换时由于软件进行切换所带来的冲击。该算法在并网阶段微电源逆变器具有有源滤波器功能,消除非线性负载对电网带来的谐波电流;其电压环采用比例谐振控制器有效消除孤岛时微电源逆变器输出的电压静差。仿真结果验证了控制策略的正确性。

A Hybrid Control Mode for Micro-Grid Seamless Operation

For the drawback of traditional micro-source inverter control algorithms that needs switch between the micro-grid grid-tied and islanding operation,a novel hybrid control mode for micro-grid seamless control was proposed. The hybrid control strategy algorithm can work with grid-tied and islanding state,which eliminates the state switching instant impact when the software switches. In the stage of the micro-grid grid-tied the hybrid control mode makes the micro-source inverter with active power filter functions,eliminating the harmonic current created by the non-linear loads. A proportional resonant controller is utilized in voltage loop that effectively eliminates the inverter output voltage static error in islanding state. The simulation results verify the correctness of the proposed control strategy.