高速永磁同步电机解耦控制——低载波比数字延时与Smith预估控制  

Decoupling Control of High-Speed PMSM——Digital Delay by Low Carrier Ratio and Smith Predictive Control

作　　者：顾思芸 沈建新[1] GU Siyun;SHEN Jianxin(College of electrical engineering,Zhejiang University,Hangzhou 310027,China)

机构地区：[1]浙江大学电气工程学院,杭州310027

出　　处：《微电机》2024年第1期18-25,共8页Micromotors

基　　金：国家自然科学基金(51837010,U22A20214)。

摘　　要：永磁同步电机(PMSM)运行在高速工况时,由于逆变器的开关频率受限使得载波比较低,会出现数字延时加剧的问题,直接影响了系统的控制性能,甚至造成系统失稳。针对低载波比工况下的数字延时问题,首先对数字延时环节进行精确的复矢量建模,并基于转速及电流环带宽的根轨迹、闭环零极点图及波特图分析数字延时对系统性能的影响,并给出考虑延时后系统的临界失稳转速。结合复矢量解耦策略,提出一种改进的基于Smith预估控制的解耦延时补偿电流控制策略,能够避免高速低载波比工况下系统失稳的问题,提高了电流环的稳定性,同时具有较好动态响应能力和解耦性能。采用Simulink仿真对比验证了所提的解耦延时补偿控制策略的有效性。When the permanent magnet synchronous motor(PMSM)runs at high speed,due to the limited switching frequency of the inverter,the carrier ratio is low,and the problem of digital delay will be aggravated,which directly affects the control performance of the system and even causes the system instability.Aiming at the problem of digital delay under low carrier ratio condition,the digital delay was modeled accurately in complex vector form.The influence of digital delay on the system performance was analyzed based on the root locus of speed and current loop bandwidth,closed-loop zero pole diagram and bode diagram,and the critical instability speed of the system was given.Combined with the complex vector decoupling strategy,an improved decoupling and delay compensation current control strategy based on Smith predictive control was proposed.This strategy can avoid the instability of the system at high speed and low carrier ratio,improve the stability of the current loop,and the system has better dynamic response and decoupling performance.Simulink simulation was used to verify the effectiveness of the proposed decoupling and delay compensation control strategies.

关 键 词：永磁同步电机 低载波比 延时补偿 SMITH预估控制 复矢量 

分 类 号：TM351[电气工程—电机] TM341[自动化与计算机技术—检测技术与自动化装置] TP273[自动化与计算机技术—控制科学与工程]