摘要
鉴于传统P—f、Q—V下垂控制特性曲线为直线,在负荷功率波动大时无法起到稳定逆变器输出电压的作用。本文设计了一种基于下垂特性自适应的改进下垂控制方法,使并联逆变器在负荷功率波动大时,既可以实现输出功率合理分配,又可以稳定输出电压,使系统不具备振荡的条件。仿真结果表明,改进下垂控制方法在仿真开始后0.3s开始进行动态调节,在负荷功率剧烈波动下,能以1:0.8的比例在两台逆变器间分配输出功率,且避免了系统发生振荡。
As the traditional P—f,Q—V droop control curve is a straight line,which haven＇t the ability of stabilizing the inverters＇output voltage when the load power has aroused fierce disturbance.To solve this problem mentioned above,a redesign method is presented which base on the improved adaptive drooping characteristic,the parallel inverters could not only stabilize the output voltage,but also share the output power better,system haven＇t the condition of vibration.Finally,experimental result prove that,after 0.3s from starting simulation,the redesign method of droop control is switch to dynamic-modulation,the double PWM system export the power as the proportion of 1∶0.8,at the same time,the load power is changing fiercely and the method is also refrain the system from oscillation.
出处
《中国农机化学报》
2016年第1期197-203,共7页
Journal of Chinese Agricultural Mechanization
基金
"十二五"国家科技支撑项目(2012BAJ26B00)
关键词
下垂控制
微网
逆变器并联
功率扰动
droop control
micro-grid
parallel inverters
power disturbance
