基于动态功率偏差调节的双馈风力发电系统MPPT控制策略

MPPT Control Strategy for Doubly-fed Wind Power Generation System Based on Dynamic Power Deviation Adjustment

在分析贝兹理论的基础上,指出无论基于怎样的系统结构,直接使用贝兹理论会由于风机系统参数、运行磨损及外界条件等因素的变化,导致给定参考值与实际值之间存在误差。从系统整体响应特性看,转速控制模式动态特性优于电流控制模式动态特性。由此,提出一种基于动态功率偏差调节的可实现理论上无静差的动态MPPT控制策略。仿真结果证实了该算法的有效性和在静、动态性能上的优越性。

On the basis of the analyzing the Betz theory, the directly usage of the method would bring on error between reference value and actual value in some traditional MPPT control methods for the variation of structure parameters, operation abrasion and outside factors. Compared to current control mode, the speed control mode was better in dynamic system response characteristics. An improved control method based on the measurement of dynamic power deviation without static error was offered. Finally, simulation results have verified the validity of this method and the better dynamic and static performance.