适用于单相并网逆变器的改进型谐振控制方法研究  

Research on improved proportional resonance control method suitable for single-phase grid-connected inverter

作　　者：谭超[1] 李兴林 吴晨光 付瑞杰 TAN Chao;LI Xinglin;WU Chenguang;FU Ruijie(College of Electrical Engineering and New Energy,China Three Gorges University,Yichang 443002,China)

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002

出　　处：《现代电子技术》2021年第17期130-135,共6页Modern Electronics Technique

基　　金：国家自然科学基金资助项目(51707103)。

摘　　要：针对传统比例谐振(PR)控制器在电网频率变化时无法保证零稳态跟踪误差的问题,提出一种适用于单相并网逆变器的具有频率自适应能力的改进型PR控制方案。在传统的PR控制器基础上引入频率自适应环节,对控制系统的频率估算动态性能进行分析,得出频率估算的传递函数,对其中参数进行设计,使得控制系统频率能够适应电网频率的变化。在电网电压谐波失真时,通过谐波补偿器与PR控制器并联的方式,降低入网电流谐波畸变率,然后对改进的PR控制系统抗干扰能力进行了详细分析,理论上实现了在电网频率变化时零稳态跟踪误差。在Simulink中搭建基于改进型PR控制系统的并网逆变器仿真模型。仿真结果表明,提出的控制方法具有频率自适应能力,并且整体性能优于传统的控制方法。In view of the fact that the traditional proportional resonance(PR)controller fails to guarantee zero steady-state tracking error when the grid frequency changes,an improved PR control method for single-phase grid-connected inverter is proposed,which can adapt to the change of grid frequency. In this method,the step of frequency adaption is introduced on the basis of the traditional PR controller. The frequency estimation dynamic performance of the control system is analyzed to get the transfer function of the frequency estimation. Its parameters are designed,so that the frequency of the control system can adapt to the change of the grid frequency. When the grid voltage is harmonic distortion,the harmonic distortion rate of incoming current is reduced by the parallel connection of the harmonic compensator and the PR controller. And then,the anti-interference ability of the improved PR control system is analyzed in detail. So far,zero steady-state tracking error is achieved theoretically when the grid frequency changes. A grid-connected inverter simulation model based on improved PR control system is built on Simulink and compared with the traditional PR control system. The results show that the proposed control method has the ability of frequency adaptation,and the overall performance is better than that of the traditional control method.

关 键 词：比例谐振控制器 频率自适应 并网逆变器 动态性能 谐波补偿器 谐波畸变率 零稳态跟踪 抗干扰能力 

分 类 号：TN876-34[电子电信—信息与通信工程] TM464[电气工程—电器]