带谐波抑制的新型异步电机无功补偿控制策略

A Novel Control Strategy of Reactive Power Compensation and Harmonic Suppression for Asynchronous Motor

针对由电容器和静态无功发生器组合而成的异步电机无功补偿装置仍然存在的谐波放大的问题,研究了相应的控制策略。首先,研究了基于多个二阶广义积分器的负载谐波电流准确提取算法;其次,在传统的d轴电网电压定向矢量控制的基础上,加入谐振控制器来控制脉宽调制并网变换器向电网输出的谐波电流,从而实现对电网谐波电流的抑制。构建系统的仿真模型,进行了仿真研究,仿真结果验证了谐波提取方法和控制策略的有效性。

The control strategies were studied to solve the problem of the harmonic currents increment in the reactive power compensator consisting of capacitors and static var generator.Firstly,accurate extraction algorithm of load harmonic current based on multiple second-order general integrator was investigated.Secondly,resonant controller was applied to control the harmonic current flowing from the pulse width modulation grid-connected converter to the grid based on the traditional d-axis grid-voltage-oriented vector control,so as to suppress the harmonic current in the grid.Simulation model of the system was established and simulation research was carried out.The validity of the extraction algorithm of load harmonic current and the control strategy of harmonic suppression was verified by the simulation results.