双馈电机变环宽多阶滞环电流控制方法的研究

Research on Control Strategy of Low Voltage Ride Through Based on Doubly Fed Induction Generator

为减少双馈异步风机并网谐波含量,提出了一种新型变环宽多阶滞环电流控制的方法.研究了环宽与频率之间的关系,在普通变环宽表达式的基础上考虑初相位的影响,对滞环环宽建立关于频率与初相位的精确建模.仿真结果表明,新型变环宽多阶滞环电流控制方法能实现电流的快速稳定跟踪,并大大降低电流中的谐波含量.

In order to reduce the total harmonic distortion（THD） of the double-fed wind generator which is connected to the grid, this paper puts forward a novel control method of variable multistage hysteresis current. The relationship between hysteresis and frequency has been studied in this papper. And accurate model of hysteresis about frequency and initial phase is set up. The simulation results show that the proposed current regulator has a superior tracking performance with low harmonic content of the current.