基于重复PI的LCL并网逆变器控制参数设计  

Parameter Design Method of Repetitive PI Controller Used for LCL-type Grid-connected Inverter Control

作　　者：尹有为[1] 井敬 杨树德[1] 杨志强 王戈 YIN Youwei;JING Jing;YANG Shude;YANG Zhiqiang;WANG Ge(Faculty of Automation and Information Engineering,Xi’an University of Technology,Xi’an 710048,Shaanxi,China)

机构地区：[1]西安理工大学自动化与信息工程学院,陕西西安710048

出　　处：《电气传动》2018年第9期67-71,共5页Electric Drive

摘　　要：目前普遍根据小增益定理对重复控制参数进行整定,但该方法设计的参数只是系统稳定的充分非必要条件。为此,提出基于极点分布的重复PI控制器参数设计方法,通过对闭环系统的误差传递函数进行分解,弱化了PI和重复控制器之间的耦合,使参数设计过程更清晰。此外,以极点距z平面原点距离最近为目标设计重复控制参数可得到系统稳定的充要条件,同时避免了采用极点分布法的复杂性。仿真结果证明了所提参数设计方法的有效性。The parameters of repetitive controller are usually obtained according to the small gain theory.However,the parameters designed based on this theory are only the sufficient but not essential conditions for the system stability.Therefore,a parameter design method of repetitive combined PI(proportional-integral)controller based on poles distribution was proposed.By decomposing the error transfer function of the closed-loop system,the coupling between the PI and the repetitive controller was weakened,which made the parameters design process clearer.In addition,the parameters design method with the object that the nearest distance from the poles in the z-plane to the original point could obtain the sufficient and necessary conditions of the system stability while avoiding the complexity of poles distribution method.Finally,the simulation results show the validity of the proposed parameters design method.

关 键 词：并网逆变器 小增益定理 极点分布 重复PI控制 参数设计 

分 类 号：TM46[电气工程—电器]