超高基频与超宽速域电机驱动系统优化设计

Optimization Design of Ultra-high Fundamental Frequency and Ultra-wide Speed Motor Drive System

对超高速电机驱动系统而言,因其具有超高基频与超宽速域特性,传统驱动方案中低载频比及参数失配问题已无法忽略,否则难以保证电机稳定运行。针对上述问题,该文从系统模型、控制律和稳定域等方面进行深入分析与优化设计。首先,对考虑数字延迟的超高基频驱动系统进行重构建模与稳定性分析,并归纳总结控制策略设计难点。其次,为保证电机超高基频稳定运行,通过指令电压修正与电流预测,设计出一种改进型超高速电机控制策略,实现了系统延迟主动补偿。同时,为提高电流调节器超宽速域参数适应性,采用“DBC+IC”结构对其进行优化设计,有效解决了参数失配问题。最后,在基于GaN宽禁带器件驱动平台上实现了一台超高速微型永磁电机0~550000r/min宽转速范围稳定运行,验证了该文所设计驱动系统的可行性及优越性。

For ultra-high speed motor drive system,due to its characteristics of ultra-high fundamental frequency and ultra-wide speed range,the problems of low carrier frequency ratio and parameter mismatch of the traditional drive scheme can not be ignored;otherwise,it is difficult to ensure the stable operation of the motor.Aiming at the above problems,this paper provides in-depth analysis and optimal design in terms of system model,control law and stability domain.First,the reconstruction modeling and stability analysis of the ultra-high fundamental frequency drive system considering digital delays are carried out,and the difficulties in the design of the control strategy are summarized.Secondly,to ensure the stable operation of the motor at ultra-high fundamental frequency,an improved ultra-high-speed motor control strategy is designed by command voltage correction and current prediction to realize the active compensation of system delay.Meanwhile,in order to improve the parameter adaptability of the current regulator in the ultra-wide speed domain,the"DBC+IC"structure is used to optimize its design,which effectively solves the parameter mismatch problem.Finally,on the GaN wideband device based drive platform,the stable operation of an ultra-high speed miniature permanent magnet motor with a wide speed range of 0~550000r/min can be achieved,which has verified the feasibility and superiority of the designed drive system.