混杂负载条件下串联型微电网输出电压控制

摘要

不平衡/非线性混合负载是微电网易于遇到的一种复杂运行条件,它对系统输出电压控制提出了更高的要求.针对一种串联结构的新型微电网,研究了其在不平衡/非线性混合负载条件下的电压控制方法.给出了组合式三相串联型微网结构及其逆变环节等效电路;建立了被控对象的数学模型,并进行了电容电流内环比例调节、电容电压外环多准比例-谐振调节的双闭环控制器设计;通过仿真分析验证了双闭环控制作用下三相串联型微电网对不平衡/非线性混合负载条件的适应性.%The unbalancedonlinear hybrid load is a complicated operation condition commonly encountered in micro-grids,which raises higher requirements for output voltage control.In this paper,a new output voltage control method of a series micro-grid under unbalancedonlinear hybrid loads is studied.Firstly,the three-phase series combined micro-grid structure and series inverter-link equivalent circuit are given;secondly,the mathematical model of the object is established,and the double closed loop controller including the capacitor current inner loop proportional control,capacitor voltage outer loop multi-quasi proportional resonant is designed.Finally,the adaptability of the three-phase system to the unbalancedonlinear hybrid load condition is verified by simulation.