改善永磁同步电机驱动系统暂态性能的研究

Research on Improve Transient Performance of Permanent Magnet Synchronous Machine Drives

提出了一种新的永磁同步电机驱动系统快速电流控制方法。在电机反电动势较高时,电流调节器趋于饱和,电压裕量不足。又因为d轴电压裕量比q轴电压裕量大,在电流调节器前加入一个暂态电流修正器,重新分配d,q轴电压裕量,改善电机在高速运行及电流变化较大时的电流控制能力。通过该方法能在不恶化系统电流稳态性能的情况下有效提高电流控制的暂态性能。该方法在宽调速范围即基速以下恒转矩区域及基速以上的弱磁区域皆可行。采用该方法,在d,q坐标系上通过所谓的"捷径路径"来修正参考电流,从而使实际电流跟踪参考电流。仿真和实验验证了所提方法的可行性。相比传统方法,所提方法电流稳定时间能减小45%。

A new control method for the fast current control of permanent magnet synchronous machines is proposed. This method can improve the transient state of current control without damaging steady-state performance.This method is feasible in a wide range of speed：both in the speed below the base speed and in the flux weakening region.Using the proposed method, the given values of d,q currents are modified so that the currents can follow the so-called ＂shortcut＂ trajectory in the d,q coordinate frame.This method＇s effectiveness is confirmed by computer simulations and experiments.The settling time is reduced by 45% compared with the traditional method.