虚拟电流注入法在线补偿转子位置估算误差

旋转高频注入法能估计永磁同步电机零速和低速时的转子位置,但在转子磁极位置解调过程中滤波器的使用会带来较大估算误差.提出虚拟电流注入法来在线补偿转子位置误差,基于估算的转速,构造与负序响应电流同频率的虚拟电流,经过与负序电流完全相同的解调,得到的虚拟电流相位与解调前相位的差值补偿估算的转子位置.分析比较了注入旋转电压导致...

Rotor position estimation error compensated by virtual current injection method online

The rotating high-frequency injection method can estimate the rotor position of the permanent magnet synchronous motor at zero speed and low speed. However, the use of filters in demodulation introduces estimation errors. A virtual current injection method was proposed to compensate the rotor position error on-line. Based on the estimated speed, the method structured a virtual current same frequency as the negative sequence response current. After the same demodulation as the negative sequence current, the method obtained the phase of virtual current. The error between the obtained phase and structured phase was used to compensate the estimated rotor position. Further analysis compared the actual speed fluctuation with that of the estimated speed fluctuation, caused by the rotating voltage and the positive sequence response current respectively. A low-pass filter was advocated to improve the compensation effect. Simulations and experiments verified the effect of the proposed method on rotor position error compensation when the motor was in different states.