一种消除电压型磁链观测器中直流偏置误差的新方法

New integral error correction method for rotor flux identification of AC drives

为消除直流偏置积分误差对电压型转子磁链观测器的影响 ,提出了一种新型的闭环积分校正算法。该算法通过引入闭环比例积分 (PI)校正环节和直流偏置积分校正环节对电压型磁链观测器进行校正。可以完全消除直流偏置以及初始值积分误差对转子磁链造成的影响、同时还能保证转子磁链辨识无稳态误差 ,适合于在低速下和无速度传感器的情况下使用。

The voltage based flux estimation method is widely used in flux orientation motor drive systems, but the error caused by the DC drift and the initial value are very difficult to eliminate. A new closed loop method is proposed which uses a closed proportion integral (PI) regulator and a DC bias corrector to compensate for the errors. Compared to the conventional method, the proposed method can eliminate the DC bias errors without adding other errors to the steady state flux. The method is also more effective at low speed or in control without speed sensor. Simulation and experimental results are presented to verify its feasibility.