轨道交通用永磁同步电机系统的延时补偿策略

The Delay Compensation Strategy of Permanent Magnet Synchronous Motor in Rail-Transit Applications

针对轨道交通用永磁同步电机驱动系统多模式脉宽调制的工作特点,在低开关频率下提出一种改进的延时补偿策略来获取驱动电压信号。受系统延时影响,输出电流性能会出现如交直轴电流耦合、无效谐波干扰加大等现象。在低转速基于载波的SVPWM调制区域,设计一种自适应扰动观测器来获取逆变器非线性延时引起的q轴扰动电压。在id=0的电流控制策略中实时获取补偿时间估计值,并等效为三相电压补偿值作用于三相给定电压。在高转速的SHEPWM调制区域,通过对电压矢量角和调制深度的简单预测,即可消除系统计算延时的影响。通过实验对该方法进行了验证,结果表明了该延时补偿策略在多模式脉宽调制策略中的有效性。

Aiming at the characteristics of the multi-mode PWM of permanent magnet synchronous motor drive system in rail transit electric was introduced,an improved time delay compensation strategy was proposed to obtain the driving voltage signal under low switching frequency.Affected by the system time delay,the output current performance appeared d,q-axis currents coupling and harmonic interference.In the low-speed carrier-based SVPWM modulation,an adaptive disturbance observer was designed to obtain the q-axis disturbance voltage caused by the inverter nonlinearity delay.In the current control strategy with id=0,the estimated value of compensation time was obtained in real time,and the three-phase compensation voltages were added to the given value.In the high-speed SHEPWM modulation,by simply predicting the voltage vector angle and modulation depth,the influence of the system calculation delay could be eliminated.The proposed method is verified through experiments,and the result shows the effectiveness of the proposed system delay compensation strategy in the multi-mode PWM.