摘要
为了解决传统脉宽调制(Pulse Width Modulation,PWM)策略由于高速开关动作导致在固定开关频率附近聚集大量谐波的问题,对永磁同步电机(Permanent Magnet Synchronous Motor,PMSM)伺服驱动系统中的随机调制策略进行了研究。在常规随机开关频率调制(Random Switching Frequency PWM,RSF-PWM)的基础上,双随机调制策略(Dual Randomized Modulation PWM,DRM-PWM)通过引入零矢量作用时间的随机化,有效提升了电磁兼容性(Electromagnetic Compatibility,EMC)。然而,该策略在电磁干扰(Electromagnetic Interference,EMI)抑制效果与系统控制性能之间难以兼顾。为此,后续又对多平均开关RSF-PWM(Multi-Average Random Switching Frequency SVPWM,MARSF-SVPWM)策略进行了研究,并重点对两种调制策略进行了对比分析。相较于DRM-PWM策略,MARSF-SVPWM策略在保持整体扩频范围和平均开关频率不变的前提下,缩小了相邻开关频率差值的分布范围,从而进一步降低谐波峰值。仿真和试验结果表明,MARSF-SVPWM策略获得了优于DRM-PWM策略的谐波分散效果,并且对系统控制性能的影响维持在较低的水平,优化了EMI抑制效果。
To address the issue of harmonic concentration near fixed switching frequencies caused by high-speed switching actions in traditional PWM strategy,the random modulation strategies in the PMSM servo drive system are studied.On the basis of conventional RSF-PWM strategy,DRM-PWM strategy enhances EMC by introducing randomization of the zero-vector action time.However,this strategy struggles to balance EMI suppression effectiveness with system control performance.Subsequently,MARSF-SVPWM strategy is investigated,with a focus on comparing and analyzing the two modulation strategies.Compared to DRM-PWM strategy,MARSF-SVPWM strategy maintains overall spread spectrum range and average switching frequency while narrowing the distribution range of differences between adjacent switching frequencies,thereby further reducing harmonic peaks.Simulation and experimental results demonstrate that MARSF-SVPWM strategy achieves better harmonic dispersion performance compared to DRM-PWM,and maintains a lower impact on system control performance,optimizing the EMI suppression effect.
作者
何静萱
杨磊
黄玉平
朱家厅
卜飞飞
HE Jingxuan;YANG Lei;HUANG Yuping;ZHU Jiating;BU Feifei(Nanjing University of Aeronautics and Astronautics,College of Automation Engineering,Nanjing,210016;Beijing Institute of Precision Mechatronics and Controls,Beijing,100076;Innovation Center for Control Actuators,Beijing,100076)
基金
航空科学基金:(2023M024052001)
江苏省研究生实践创新计划项目(SJCX24_0135)。
