一种高性能感应电机无速度传感器矢量控制策略

High performance induction machine sensorless vector control strategy

针对传统感应电机电压模型磁链估计算法存在积分初值问题与直流漂移问题,提出了一种改进型磁链估计算法,采用带通滤波器代替纯积分环节,并加入带有自适应磁链幅值估计器的补偿环节来补偿带通滤波器所引入的磁链幅值和相位误差。对该算法所需的各个参数的影响进行了深入研究,给出了参数的选择方法。结合一种简单实用的转速估计方法,提出了一种新型高性能感应电机无速度传感器矢量控制策略。仿真和实验结果表明,该控制策略动态和稳态性能良好,在宽调速范围内有效地解决了定子反电动势积分时存在的积分初值问题与直流漂移问题。

To solve the integral initial value and DC drift problems of traditional voltage model flux estimation algorithm of induction machine,a modified flux estimation algorithm was proposed. In this modified algorithm,a band pass filter（ BPF） was used to replace pure integrator and a compensator with an adaptive flux amplitude estimator is designed to compensate the errors in amplitude and phase angle caused by the introduction of BPF. The effect of the parameters used in this algorithm was studied,and the method to choose the parameter values was also presented. With the introduction of a simple and practical speed estimation algorithm,a new high- performance speed sensorless vector control strategy was proposed.Simulation and experiment results demonstrate that this control strategy achieves great performance both in steady state and dynamic process,and is effective to solve the integral initial value and DC drift problems associated with the integration of the back electromotive force（ EMF） over a wide speed range.