改进的低压微电网孤岛模式下的控制策略

孤岛模式下的低压微电网运行时,如果负载发生变化,传统的下垂控制策略不能有效的控制系统的电压和频率,维持微电网的稳定性。为了解决上述问题,在传统的下垂控制基础上提出了一种改进的自动调整的下垂控制策略,引入了PI前馈控制,通过改变下垂曲线的斜率以及对曲线进行平移,对电压和频率进行调整。首先对该控制策略的原理和方法进行分析,然后在SIMULINK平台下,对传统的和改进的下垂控制策略进行了仿真和分析。仿真结果表明,提出的改进的下垂控制策略可以更有效更快速的控制低压微电网的电压和频率,使其在孤岛模式下的运行更加稳定。

Improved Control Strategy of Low-voltage Micro-grid Under Islanding Mode

When low-voltage micro-grid is under islanding mode, the traditional droop control can not effectively control the voltage,frequency and stability of system when the load changes. In order to solve the above problems, a self-regulating droop control strategy based on the conventional droop control is proposed, introducing the PI feedforward control to adjust the voltage and frequency by changing the slope of the droop curve and translation of the curve. First of all, the principles and methods of the control strategy are analyzed, then simulated traditional droop control strategy and improved control strategy in Simulink. The simulation results show that the proposed improved droop control strategy can control of the voltage and frequency more effectively and rapidly, so that the low-voltage micro-grid running more stablely in island mode more stable.