摘要
由传统下垂控制方式构成的逆变器并联系统在受扰动时易产生振荡,当负荷发生剧烈变化时,系统的稳定性易受影响。在功率计算环节引入的低通滤波器会增大系统惯性的同时也会延缓系统响应速度。本文在传统控制方式上加入以下两项来改善效果,即功率微分项和一次函数项(功率与下垂控制系数的一次函数项)。功率微分项能明显提高系统的稳定运行性能和动态响应性能,一次函数项能有效实现下垂系数随功率变化自适应调节。
The inverter parallel system composed of traditional droop control system is prone to oscillate when it is disturbed,and the stability of the system is easily affected when the load changes violently.The low pass filter introduced in the power calculation can increase the system inertia and delay the system response speed.In the traditional control method,the following two items of power differential term and primary function term(power and droop control coefficient)are added.The power differential term can significantly improve the stability and dynamic response performance of the system,and the primary function term can effectively realize the adaptive adjustment of the droop factor with the power change.
作者
廖丽
张昌华
段雪
刘倪
Liao Li;Zhang Changhua;Duan Xue;Liu Ni(College of Energy Science and Engineering,University of Electronic Science and Technology of China,Chengdu 611731,China)
出处
《电测与仪表》
北大核心
2018年第18期1-8,共8页
Electrical Measurement & Instrumentation
关键词
微电网
改进下垂控制
小信号稳定性
逆变器
micro-grid
improved droop control
small signal stability
inverter
