基于Logistic指数型函数的孤岛微电网下垂控制

Droop Control of Isolated Island Microgrid Based on Logistic Exponential Function

在孤岛微电网系统的下垂控制模块中需要控制有功和频率,而传统下垂控制方法往往采用有功与频率的一次函数形式。当孤岛微电网系统负荷变化时,传统下垂控制方法不能稳定控制系统频率。于是提出一个两端具有饱和性质的指数型函数来改进控制方程,在保证频率稳定的前提下,有效地改善功率控制的精度。基于MATLAB/Simulink仿真平台,搭建了传统下垂控制和基于Logistic指数型函数的下垂控制微电网模型,结果表明Logistic指数型函数下垂控制比传统下垂控制具有更好的稳定性。

The island microgrid system adopts active power and frequency control(P-f)in the droop control model.In the traditional droop control method,the linear function is the expression for active power and frequency control(P-f).The traditional droop control method is unable to control the system frequency steadily when the load of the island microgrid system makes changes.Therefore,the paper puts forward the Logistic exponential function which is saturated on both sides to improve a controlled equation.The accuracy of power control can be improved effectively while ensuring frequency stability.The improved droop control microgrid model and the traditional droop control microgrid model are built in Matlab/Simulink software.Simulation results show that the Logistic exponential function droop control has better stability than the traditional droop control.