应用综合控制策略的微电网建模与仿真

Modeling and Simulation of Microgrid Based on Synthesis Control

为提高间歇性能源的利用效率,确保微网安全高效运行,研究了含有多个微电源模型的微网暂稳态特性,通过MATLAB/Simulink软件,利用已经构建的各种微电源模型搭建了典型微电网的仿真平台。考虑了微电网受到扰动时内部电压和频率的支撑问题,建立了基于电压型逆变器(voltage source inverter,VSI)的PQ—Uf(有功无功-电压频率)控制策略以确保其稳定运行。应用几个典型算例仿真模拟了微电网运行的各种状态。试验表明:该微电网仿真系统能够实现微电网由并网到孤网,由孤网到并网运行模式的平滑切换,能够承受较强的负荷投切冲击,能够抵御较严重的短路故障情况,为微电网的进一步研究提供了仿真试验基础。

In order to enhance the efficiency of intermittent energy and to ensure that the microgrid operation is safe and reliable, we studied the temporary and steady state characteristics of microgrid. Meanwhile, we built a typical microgrid simulation platform by using micro-power models that had been constructed by MATLAB/Simulink. Taking into account the voltage disturbance and frequency support, we also built a voltage source inverter with PQ--Uf control strategy. Moreover, we adopted a few typical simulation examples to simulate all kinds of operation states of Microgrid. It is shown that the simulation platform could simulate the operation of microgrid from the grid to the island and from the island to the grid smoothly, could bear a strong impact on the load switching, and also bear serious short-circuit fault conditions.