一种串联型微电网功率协调控制策略

A Power Coordination Control Strategy for Series Micro-grid Based on Maximum Output Power of Micro-source

为实现孤岛运行模式下串联型微电网系统(Series micro power grids,SMPGs)的稳定、优化运行,本文研究了一种串联型微电网的功率协调控制策略。首先,介绍了孤岛模式下单相串联型微电网的拓扑结构及其功率协调控制原理;其次,以微源最大出力作为优化调度考虑的首要因素,在按各微源最大输出功率成比例进行功率分配的基础上,考虑到微源逆变器的超调状况,对出力能力偏大的微源的输出功率进行修正,最终得到功率分配量;最后,结合载波变幅移相调制方式,将分配得到的功率参考量转换为三角载波幅值调节量,实现对各微源逆变器输出功率的调节。仿真结果表明,该控制策略能够保证孤岛模式下微源内部功率平衡,并实现各微源按"能者多劳"原则输出功率。

In order to achieve the stability and optimization of the series micro power grids （SMPGs） in the islanding mode, a power coordination control strategy for series microgrids is researched in this paper. Firstly, the topology of the single-phase series microgrid in the island mode and its power coordination control principle are introduced. Secondly, based on the maximum output of the micro-source as the primary factor to optimize the scheduling, according to the maximum output power of each micro-source on the basis of the power distribution, taking into account the micro-source inverter overshoot situation, the output capacity is too large The output power of the micro-source is corrected, and finally the power distribution amount is obtained. Finally, in combination with the carrier amplitude shift phase modulation method, the allocated power reference is converted into the triangular carrier amplitude adjustment to realize the adjustment of the output power of each micro-source inverter. The simulation results show that the control strategy can guarantee the internal power balance of the micro-source in the island mode, and realize the output power of the micro-source according to the principle of ＂Dedicated capacity of the micro-source should be more output power＂.