摘要
降低开关频率造成地铁牵引电机定子磁链谐波较大,无法保证其安全稳定运行。为此,在低开关频率约束下,提出基于连续型操作的牵引电机定子磁链控制技术。计算旋转磁场和转子的转速差,利用定子电阻、电角速率等参数创建牵引电机等效电路,明确牵引电机运行情况;将定子静止坐标系中的电流与磁链视作变量创建滑模观测器,获得定子磁链当前观测值;运用间接定子量控制法增强牵引电机低速控制能力,推导定子磁链与电磁转矩在静止坐标系中的空间向量;面对中高速运行电机速率,采用连续多磁链控制策略,将磁链轨迹从圆形平滑过渡到多边形,完成平滑的定子磁链闭环控制。实验结果表明,所提方法很好地控制了转矩波动与电流冲击,提高了牵引电机系统的整体控制能力,在长时间工作下依旧能保证地铁可靠运行。
The reduction of switching frequency causes large harmonic of stator flux linkage of metro traction motor,which cannot ensure its safe and stable operation.Therefore,under the constraint of low switching frequency,the stator flux control technology of traction motor based on continuous operation is proposed.The rotating magnetic field and the speed difference of the rotor are calculated,the equivalent circuit of the traction motor is created by using the stator resistance,electrical angular rate and other parameters,and the operation of the traction motor is determined;the current and flux in the stator stationary coordinate system are regarded as variables to create a sliding mode observer,and the current observation value of the stator flux is obtained;the indirect stator control method is used to enhance the low speed control capability of traction motor,and the space vector of stator flux and electromagnetic torque in static coordinate system is derived;in the face of medium and high speed running motor speed,the continuous multi flux control strategy is adopted to smooth the flux track from circle to polygon and complete the smooth stator flux closed loop control.The experimental results show that the proposed method can effectively control the torque fluctuation and current impact,improve the overall control capability of the traction motor system,and ensure the reliable operation of the subway under long working hours.
作者
刘尧
LIU Yao(The First Operation Company Branch of Beijing Subway Operation Co.,Ltd.,Beijing 102200,China)
出处
《机械与电子》
2023年第8期71-75,共5页
Machinery & Electronics
关键词
牵引电机
定子磁链控制
低开关频率
数据观测
等效电路
traction motor
stator flux control
low switching frequency
data observation
equivalent circuit
