基于改进下垂控制的微电网平滑切换研究

摘要

There are some problems in the operation mode switching of microgrid,such as power oscillation and bus voltage deviation large under the traditional droop control.Aiming at these problems,an improved droop control strategy was proposed.Voltage amplitude feedback control loop and fuzzy PID controller were added and the voltage compensation signal produced by adjusting the parameters according to the fuzzy control rules was added to the voltage control loop to follow the specified voltage.The power oscillation and bus voltage deviation were reduced during the switching of microgrid operation mode,so that the transient stability of the system was guaranteed.Simulation results from Simulink platform show the validity of the proposed scheme.%传统下垂控制作用下,微电网运行模式切换存在功率振荡、母线电压偏离过大等问题.针对此问题提出了一种改进的下垂控制策略.增加电压幅值反馈控制环和模糊PID控制器,依据模糊控制规则调整相应参数产生补偿信号作用于电压控制环,实现对预设电压的无差跟踪,减小了微电网运行模式切换时产生的功率振荡和母线电压偏差,保证系统的瞬态稳定性.通过Simulink平台仿真,证明了该控制策略的有效性,可实现微电网运行模式的平滑切换.