两相静止坐标系下并网逆变器改进重复控制方案  

Improved Repetitive Control Scheme of Grid Connected Inverter in Two-phase Static Coordinate System

作　　者：梁文勇[1] 吴大伟[1] 汪滔 马冰洋 LIANG Wen-yong;WU Da-wei;WANG Tao;MA Bing-yang(Wuhan Nanrui Co.,Ltd.of Stale Grid Electric Power Research Institute,Wuhan 430074,China;不详)

机构地区：[1]国网电力科学研究院武汉南瑞有限责任公司,湖北武汉430074 [2]国网温州供电公司,浙江温州325000 [3]国网冀北电力有限公司廊坊供电公司,河北廊坊065000

出　　处：《电力电子技术》2020年第6期112-116,共5页Power Electronics

基　　金：国家自然科学基金(U1134106)。

摘　　要：基于传统重复控制的并网逆变器控制技术虽然能够提高系统的控制性能,但抗电网频率波动能力弱,动态特性较差的问题却始终存在。针对此问题,提出一种基于两相静止α,β坐标系下的并网逆变器改进型重复控制方案。该方案以α,β坐标系下的LCL型并网逆变器作为研究对象,省去了d,q坐标变换与电流解耦计算,在简化模型设计的同时最大限度地降低了并网电流总谐波畸变率(THD);此外,对传统的重复控制进行优化改进,首先采用一个自适应内模取代传统重复控制内模,提高了重复控制的抗电网频率波动能力,并在此基础上加入比例积分(PI)控制,减少了系统动态响应时间,最后对控制系统的可行性进行了讨论。通过Matlab/Simulink和实验,验证了此方案不仅具有良好的动态控制性能,而且具有较好的抗电网频率波动能力。Altuough the grid-connected inverter control technology based on traditional repetitive controller could improve the whole performance of the system.But the problem of grid frequency fluctuation and poor performance of dynamic characteristic are always existed.Aiming at this problem,an advanced repetitive control strategy for gridconnected inverters based on two-phase staticα,βcoordinate system is proposed.This strategy treats the LCL gridconnected inverter in theα,βcoordinate system as the research object,which eliminates the d,q coordinate transformation and current decoupling.In this way,the model design of the LCL grid-connected inverter is simplified and the total harmonic distortion(THD)of current is minimized.Firstly,an adaptive internal model is used to replace the traditional repetitive control internal model,which improves the resistance against the frequency fluctuation of the grid.In addition,proportional integral(PI)controller is added to the repetitive controller,which reduces the dynamic response time of the system.Finally,the feasibility of the combined control system is discussed.Through the Matlab/Simulink and experiment,it is verified that the strategy not only has good dynamic control performance,but also has good resistance to grid frequency interference.

关 键 词：并网逆变器 改进型重复控制 动态控制性能 

分 类 号：TM464[电气工程—电器]