Harmonic voltage and harmonic current will produce core loss and copper loss to reduce the operation efficiency in the direct torque control system of interior permanent magnet synchronous motor (IPMSM-DTC) for urban rail traction. Efficiency optimization control strategy, which is based on switching frequency optimization, is presented for the problem. The adaptive hysteresis band value and optimized null vector distribution method are adopted to utilize the switching frequency of power device and optimize null vector to PWM. Efficiency optimization control system is implemented using a STM32...
