基于双分频带的新型随机开关频率SVPWM策略  

Novel random switching frequency SVPWM strategy based on dual-segregate-frequency band

作　　者：刘琦 朱劲松 陈文明[1] 卜飞飞[1] 秦海鸿[1] LIU Qi;ZHU Jinsong;CHEN Wenming;BU Feifei;QIN Haihong(College of Automation Engineering,Nanjing University of Aeronautics and Astronautics,Nanjing 211106,China;State Grid Jiangsu Electric Power Co.,Ltd.,Nanjing 210024,China)

机构地区：[1]南京航空航天大学自动化学院,江苏南京211106 [2]国网江苏省电力有限公司,江苏南京210024

出　　处：《电力工程技术》2023年第3期206-216,共11页Electric Power Engineering Technology

基　　金：国家自然科学基金资助项目(52177050)。

摘　　要：传统固定开关频率空间矢量脉宽调制(space vector pulse width modulation,SVPWM)技术导致的高次谐波使得电驱动系统电磁干扰问题较为严重,随机开关频率(random switching frequency,RSF)-SVPWM可用于改善此类现象。文中阐述了SVPWM技术与RSF-SVPWM技术的原理,探讨了RSF-SVPWM策略中扩频范围增大对系统的影响。为在扩频范围较小时仍能达到很好的高次谐波分散效果,提出一种基于双分频带的新型RSF-SVPWM策略。该策略以原中心开关频率为中点划分2个局部分频带,设置各自的局部中心频率点与扩频范围;以两相静止坐标系下理想β轴电压分量正负为标准,判断每一开关周期所属具体分频带后,使得开关频率围绕该分频带中的局部中心频率点进行各自的随机化。仿真与实验结果表明,该新型RSF-SVPWM策略相比于较大扩频范围的传统RSF-SVPWM策略,高次谐波分散效果相当,同时可降低系统电流环脉动,使得输出电磁转矩较为平稳,有助于推进电驱动系统在高端行业领域中的应用。The high-order harmonics caused by traditional fixed switching frequency space vector pulse width modulation(SVPWM)technology cause serious electromagnetic interference problems in electric drive systems.Random switching frequency(RSF)SVPWM can be used to solve the problem of severe electromagnetic interference.The principles of SVPWM technology and RSF-SVPWM technology are introduced,and the influence of the increase of the spread spectrum range in RSF-SVPWM strategy on the system is discussed.To achieve good dispersion of high order harmonics in a small spread spectrum range,a novel RSF-SVPWM strategy based on dual frequency division is proposed.Taking the original central switching frequency as the midpoint,the initial complete variation range is divided into two local frequency bands,and their local central frequency points and local spread spectrum range are set.Taking the positive and negative of the idealβaxis voltage component in the two-phase staticα-βcoordinate system as the standard,after judging the specific frequency division band of each switching cycle,the switching frequency is randomized around the local central frequency point in the frequency division band.The simulation and experimental results show that compared to the traditional RSF-SVPWM strategy with a wider spread spectrum range,the new RSF-SVPWM strategy has equivalent high order harmonic dispersion effect.At the same time,the new RSF-SVPWM reduces the pulsation of the system current loop and outputs a relatively stable electromagnetic torque.The new RSF-SVPWM promotes the application of electric drive systems in high-end industry fields.

关 键 词：空间矢量脉宽调制(SVPWM) 高次谐波 电磁兼容 输出转矩 随机调制 分频带 随机开关频率空间矢量脉宽调制(RSF-SVPWM) 

分 类 号：TM724[电气工程—电力系统及自动化]