CAJ | 학술논문

针对传统直接转矩控制存在转矩和定子磁链脉动大的问题，给出一种新颖的模型预测直接转矩控制方法。在逆变器驱动异步电机模型基础上建立了离散时间内部预测模型，以转矩和磁链偏差平方和作为价值函数，并根据该价值函数对每个开关矢量作用时的偏差平方和进行在线评估，选择使价值函数最小的电压矢量，也就是最优电压矢量作用于逆变器。仿真结果表明，本文所给出的模型预测直接转矩控制方法相比于传统的直接转矩控制，能够有效降低转矩和磁链脉动，减小电流谐波畸变，同时继承了传统直接转矩的快速响应特性。
침대전통직접전구공제존재전구화정자자련맥동대적문제，급출일충신영적모형예측직접전구공제방법。재역변기구동이보전궤모형기출상건립료리산시간내부예측모형，이전구화자련편차평방화작위개치함수，병근거해개치함수대매개개관시량작용시적편차평방화진행재선평고，선택사개치함수최소적전압시량，야취시최우전압시량작용우역변기。방진결과표명，본문소급출적모형예측직접전구공제방법상비우전통적직접전구공제，능구유효강저전구화자련맥동，감소전류해파기변，동시계승료전통직접전구적쾌속향응특성。
This paper presents a novel model predictive direct torque control ( MPDTC) methodology for induction motors to remedy the drawback with large pulsating torque and stator flux output of the traditional direct torque con?trol ( DTC) . On the basis of the mathematical model of an inverter driving induction motor, a discrete?time predic?tive model has been developed. By utilizing the online optimization algorithm, a cost function evaluates the square sum of torque and stator flux magnitude errors for each switching state in a two?level inverter. The voltage vector with the lowest error is then selected to be applied on inverter. The performance of the presented MPDTC scheme is compared with the traditional DTC. Simulation results show that the presented MPDTC scheme can reduce the flux and torque ripple effectively and lower the current harmonic distortion while inherit the fast transient response from the traditional DTC.