LCL滤波型三相并网逆变器的电流滑模控制策略  

Control Strategy for Three-phase Inverter With LCL-type Filter Based on Current Sliding Mode Control Method

作　　者：党超亮 同向前[1] 宋卫章[1] 刘丁[3] DANG Chao-liang;TONG Xiang-qian;SONG Wei-zhang;LIU Ding(Xi'an University of Technology,Xi'an 710054,China)

机构地区：[1]西安理工大学电气工程学院,陕西西安710054 [2]西安交通大学电力设备电气绝缘国家重点实验室,陕西西安710049 [3]西安理工大学自动化与信息工程学院,陕西西安710048

出　　处：《电力电子技术》2021年第6期1-4,共4页Power Electronics

基　　金：电力设备电气绝缘国家重点实验室资助(EIPE21201);西安市科协青年人才托举计划(095920201306)。

摘　　要：三相LCL型并网逆变器由于具有良好的高频衰减与高功率等优势,在分布式并网发电系统中获得广泛应用。然而,LCL型并网滤波网络的高频谐振特性有可能造成并网电流畸变严重,导致系统发生不稳定现象。基于此,有效利用滑模算法的非线性抗扰特性,提出一种新型的电流滑模变电流内环控制系统,进一步采用了一种改进型幂次趋近律有效地改善了滑模抖振现象。为验证所分析的正确性,构建了完整的仿真与实验测试模型,给出了详细的理论分析与滑模变结构设计方案。仿真与实验结果充分明了提出的控制策略可实现逆变器并网电流与电网电压同频同相,有效改善了并网性能并提高了系统的鲁棒性。For three-phase grid-connected inverters,the high-frequency current harmonics can be effectively suppressed by the LCL-type filter.However,the instability of grid-connected inverter may be caused with LCL-type filter,this phenomenon may deteriorate the grid current.To effectively improve the grid-current quality and guarantee good performance,a new kind of sliding mode variable structure and grid feedforward control method is proposed.Further,the modified exponential reaching law is presented to effectively improve the shaking shock effect caused by the traditional sliding mode surface.No additional sensor is needed in the proposed control strategy,which can effectively suppress grid current harmonic,quick dynamic response at the same time.The detailed theoretical analysis and design method of the proposed control strategy are presented.To verify the correctness and effectiveness of the proposed control strategy,a complete simulation model and experimental prototype platform under the digital control is established.The simulation and experimental results show that the steady and the transient performance of the LCL-type grid-connected inverter with the proposed control strategy are effectively improved.

关 键 词：并网逆变器 电流滑模控制 滤波 

分 类 号：TM46[电气工程—电器]