摘要
三相恒压恒频逆变器可采用单闭环和双闭环两种控制方法,为详细认识这两种方法的优缺点,建立同步旋转坐标系下三相逆变器模型,分别设计了带解耦的单闭环PID控制和双闭环PI-PI控制的三相逆变器。在相同的极点配置下,对比分析二者的等效输出阻抗频率特性,并在PSCAD中仿真对比动态响应性能。结果表明,两种控制方法均具有优良的动态响应性能,但双闭环控制在低频段的等效输出阻抗较单闭环低,带非线性负载能力更强,且易实现输出限流保护功能。
Both the single loop and dual loop control can be used for three phase inverter, in order to recognize the merits and faults of the two control methods in detail, this paper establishes the model of three-phase inverter in synchronous rotating coordinate system, then single closed-loop PID control and dual closed-loop PI-PI control are designed respectively. Under the same pole assignments, the equivalent output impedance frequency characteristics are analyzed contrastively, and their dynamic response performances are compared in PSCAD simulation. The re- suits show that both of the control schemes possess admirable dynamic performance, but the equivalent output im- pedance under dual closed-loop control is lower than that of single closed loop, especially in low frequency band, which lead to its better performance under nonlinear loads, moreover, it is easier to realize over current protection function.
出处
《电力科学与工程》
2014年第10期1-5,共5页
Electric Power Science and Engineering
基金
国家自然科学基金(51307054)
关键词
三相逆变器
单闭环
双闭环
极点配置
输出阻抗非线性负载
three-phase inverter
single closed-loop
dual closed-loop
pole assignment
nonlinear loads
