基于改进下垂控制逆变器的微电网控制

Control of microgrid based on improved droop controll inverter

微电网一般连接在低压配电网侧。针对低压微电网输电线路电阻值大于电抗值的特点,采用一种基于P-U和Q-f的改进下垂控制策略,设计了控制器,用于微电网运行。以双分布式电源变负荷工况为例,在matlab/simulink下进行了仿真实验。结果显示,与传统下垂控制相比,采用的控制方法可有效作用于微电网,可加快微电网的调节速度,减小微电网的功率和频率波动,提高电网的供电质量。

Based on the property of the microgrid that the resistance value of transmission line is greater than the line reactance value, an improved droop control strategy is put forward to control the microgrid in this paper. The controller used in the islanding state was designed accordingly. The experiments are conducted in the matlab/simulink environment by the example of double distributed power source in a variable load condition. The simulation results indicate that the control method used in this paper can effectively accelerate the adjusting speed of the microgrid, significantly reduce the power and frequency fluctuation of the microgrid and improve the quality of power supply.