基于MPC的三电平NPC变流器中点电位控制策略  

Midpoint Potential Control Strategy for Three-level NPC Converter Based on MPC

作　　者：李君 王倩[2] 李婉婷 施荣 李宁[2] LI Jun;WANG Qian;LI Wanting;SHI Rong;LI Ning(Academy of Modern Electric Power Research,North China Electric Power System,Beijing 102206,China;School of Electrical Engineering,Xi'an University of Technology,Xi’an 710048,Shaanxi,China;State Grid Shaanxi Electric Power Company Economic Research Institute,Xi’an 710065,Shaanxi,China)

机构地区：[1]华北电力大学现代电力研究院,北京102206 [2]西安理工大学电气工程学院,陕西西安710048 [3]国网陕西省电力公司经济技术研究院,陕西西安710065

出　　处：《电气传动》2021年第10期10-16,共7页Electric Drive

基　　金：电力传输与功率变换控制教育部重点实验室开放课题(2018AC02);陕西省自然科学基础研究计划(20185M5041);西安市碑林区区科技项目(GX1938)。

摘　　要：中点电位平衡是三电平中点钳位型(NPC)变流器研究的热点问题。针对效率优化调制策略在实际应用时受非调制因素影响导致中点电位偏移的问题,提出了基于模型预测控制(MPC)的三电平NPC变流器中点电位控制策略,通过预测两拍中点电位在效率优化策略中选择一组合适调制波,对其中点电位进行闭环控制,达到更好控制中点电位平衡的目的。通过仿真与实验验证,所提出的中点电位控制策略在保证系统效率与输出总谐波畸变率(THD)满足要求的情况下,能够实际解决由非调制因素引起的中点电位偏移的问题。The midpoint potential balance is a hot issue in the study of three-level neutral point clamped(NPC)converters.Aiming at the problem that the efficiency optimization modulation strategy is affected by non-modulation factors in the practical application so as to lead to the midpoint potential shift,a three-level NPC converter based on model predictive control(MPC)was proposed to control the midpoint potential.The midpoint potential selected a suitable set of modulated waves in the efficiency optimization strategy,and performed closed-loop control on the midpoint potential to achieve better control of the midpoint potential balance.Through simulation and experimental verification,the proposed midpoint potential control strategy can actually solve the problem of midpoint potential shift caused by non-modulation factors while ensuring system efficiency and output total harmonic distortion(THD)meet the requirements.

关 键 词：三电平NPC变流器 效率优化调制策略 模型预测控制(MPC) 中点电位 

分 类 号：TM46[电气工程—电器]