CAJ | 학술논문

逆变器死区、功率管导通压降及开关过渡过程等非线性因素易导致直接转矩控制(direct torque control，DTC)多相永磁同步电机定子电流严重畸变。该文针对六相对称偏置60°定子绕组永磁同步电机提出一种DTC策略。首先，基于零序电流等于零思想进行电压矢量重构，并由此提出理想DTC；其次，基于死区补偿原理对实际电压矢量作用时间进行离散补偿；最后，利用 PI 调节器对电压矢量作用时间进行连续补偿，实现零序电流等于零目的。实验结果表明该文提出的驱动控制系统具有快速的转矩动态响应特性；同时零序电流基本等于零，定子电流总谐波含量较低。
역변기사구、공솔관도통압강급개관과도과정등비선성인소역도치직접전구공제(direct torque control，DTC)다상영자동보전궤정자전류엄중기변。해문침대륙상대칭편치60°정자요조영자동보전궤제출일충DTC책략。수선，기우령서전류등우령사상진행전압시량중구，병유차제출이상DTC；기차，기우사구보상원리대실제전압시량작용시간진행리산보상；최후，이용 PI 조절기대전압시량작용시간진행련속보상，실현령서전류등우령목적。실험결과표명해문제출적구동공제계통구유쾌속적전구동태향응특성；동시령서전류기본등우령，정자전류총해파함량교저。
There may be serious distortion in stator currents of multi-phase permanent magnet synchronous motor with direct torque control (DTC) because of the nonlinear factors such as inverter dead-zone, power switch voltage drop and switching transition. A novel DTC was proposed for six-phase symmetric winding phase-shifted by a 60 degree permanent magnet synchronous motor. Firstly, the synthesized voltage vectors were determined to achieve the zero-sequence current, and the ideal DTC strategy was proposed based on the synthesized vectors. Secondly, the factual voltage vector operating time was compensated according to the principle of dead-zone compensation. At last, the voltage vector operating time was regulated continuously by a proportion-integral controller aiming at zero zero-sequence current. The experimental results show that the presented DTC has fast response of torque and the total harmonics is very small due to very lower zero-sequence current.