基于电力电子变压器的三端协调控制

为研究电力电子变压器对主网、交流微网、直流微网的三端协调控制,根据微网内分布式能源出力与功率缺额,提出了一种确定储能荷电状态预期值的方法。并基于此荷电状态值,综合考虑微网内源、荷、储三者关系,将微网运行状态划分为电源型微网和负载型微网。电力电子变压器根据微网类型,控制交直流微网功率流向与大小,最大化消纳分布式能源,以减少微网对配网的功率回馈次数及回馈时产生的功率损耗。仿真结果和实验数据验证了所提划分方法和控制策略的有效性。

Three-terminal synergistic control based on power electronic transformer

In order to analyze the synergistic power control of three-terminal power electronic transformer in power grid, AC microgrid and DC microgrid. A method to determine the expected value of energy storage state is proposed according to the power of distributed energy generation and the loss of power supply probability in the microgrid. Based on the value of energy storage capacity and the relationship among the source, load and energy storage, the type of microgrid is divided into Power microgrid and Load microgrid. According to the type of microgrid, Power electronic transformer control the power in AC and DC microgird and maximize the consumption of distributed energy to reduce the number and loss of feedback power. The simulation results and experimental data verify the effectiveness of the proposed method and control strategy.