等三相感应电机单相运行磁场定向控制策略研究

Analysis of Single Phase Field Oriented Control Strategy of Induction Motor

本文研究三相感应电机出现故障导致缺相运行时,基于磁场定向控制理论控制电机继续可靠稳定运行,确保不出现连锁性事故.首先基于三相感应电机单相运行等效电路分析了电机运行的特点,通过构建单相供电下电机正负序电流,推导出电机单相运行下,磁场定向控制的电磁转矩显性表达式,得出相应的控制框图.MATLAB仿真结果表明,当三相电机某相出现开路导致缺相运行情形下,采用磁场定向控制策略,电机仍然能够可靠稳定运行,电机运行速度越高,其空载和带载两种情形下的稳定性越好,从而验证了本文控制方法的有效性.

To ensure there will be no cascading failure of induction motor in default of one stator phase, the motor control strategy is studied under this condition based on field oriented theory. The operational characteristic is first analyzed according to the equivalent circuit of motor in default of one stator phase. By constructing the positive and negative currents under single phase power supply, the motor torque formulation is then derived and the field oriented control schematic diagram is presented. The simulink results in MATLAB show that the motor with one stator phase opened can still be operated well using rotor field oriented control. It is also concluded that the higher motor speed is, the more stable motor will be with or without load, which validates the availability of the method.