基于变感式电抗器的矢量控制系统谐波抑制技术研究

The Research of Vector Control System Harmonic Suppression Technology Based on Variable-inductance Reactor

本文提出了一种基于变感式电抗器的变频电机谐波抑制的方法。首先,搭建了协同仿真模型,实现了变频调速系统,解决了矢量控制下场路耦合的问题。其次,对可控电抗器、矢量控制策略和谐波抑制方案进行了设计。定子电流谐波的检测是由瞬时无功功率法完成,负载转矩变化以后系统根据检测到的谐波信息匹配一个合适的电抗率来滤除某次及抑制其以上次数谐波。最后,对系统进行了仿真和实验研究。仿真和实验结果表明基于变感式电抗器的谐波抑制方法对于变频电机谐波抑制具有良好的效果。

This paper proposes a method of variable-frequency motor harmonic suppression based on variable-inductance reactor. Firstly, a co-simulation model was built. It achieves the control system of the variable-frequency motor and solves the problem of field-circuit coupling under vector control. Secondly, the controllable reactor, the control strategy and the harmonic suppression program were designed. The detection of stator current harmonics is completed by the instantaneous reactive power law. When the load torques change, the system matches an appropriate reactance rate for the reactor to suppress harmonic of a particular order and the harmonics order above it according to the detected harmonic information. At last, the simulation and experiment were carried on. The simulation and experiment results show that the method of harmonic suppression based on variable-inductance reactor is effective.