内埋式永磁同步电机宽调速范围运行控制策略

Control of interior permanent magnet synchronous motor drives over a wide speed range

为了改善内埋式永磁同步电机驱动系统的性能、效率和可靠性,提出了一套适用于其在宽调速范围运行下的控制策略。该文研究的调速系统采用转子磁链定向的矢量控制作为基本的控制策略,利用模型参考自适应系统对转子位置和转速进行估算。在低速域,采用单位电流最大转矩控制来降低电机定子电流幅值。而在高速域,利用过调制控制策略来增加脉宽调制(pulse width modulation,PWM)逆变器的电压传输比和永磁同步电机的转矩输出能力,同时采用弱磁控制策略实现永磁同步电机驱动系统高速稳定运行。研究了在过调制下的相电流重构技术对永磁同步电机高速域运行性能的影响,并讨论了从低速域的单位电流最大转矩控制到高速域的弱磁控制之间的无缝切换问题。仿真和实验结果证明了上述组合控制策略的可行性与有效性,实现了内埋式永磁同步电机驱动系统在宽调速范围的高性能控制。

A set of control strategies were developed to improve the performance, efficiency and reliability of the interior permanent magnet synchronous motor （IPMSM） drives for a wide range of speeds. Rotor flux oriented vector control with a model reference adaptive system （MRAS） based rotor position/speed estimation was used as the basic control strategy for the IPMSM drive. A maximum torque per ampere （MTPA） control strategy was used to minimize the motor current magnitude during low speed operation. Over-modulation method was used to improve the voltage transfer ratio of the pulse width modulation （PWM） inverter and the output torque capability of the IPMSM during high speed operation, with flux weakening control for high speed stable operation of the IPMSM drive. Phase current reconstruction for ove^modulation was used to improve the high speed IPMSM operation. The issue of seamless switching from MTPA during low speed operation to conventional field-weakening control during high speed operation was also discussed. Simulations and tests demonstrate the feasibility and effectiveness of these control strategies for high performance operation of IPMSM drives over a wide speed range.