双馈电机直接功率控制方法比较及实验研究

传统基于矢量表的单矢量直接功率控制以其结构简单和动态响应快等优点在双馈电机并网发电控制中得到了广泛研究，但同时具有高采样频率、变开关频率和稳态脉动大等缺点。本文在传统矢量表直接功率控制的基础上，将占空比优化的思想引入双馈电机直接功率控制中，深入研究了双矢量直接功率控制，以期在取得较快动态响应的同时，减低稳态功率脉动。最后搭建了实验平台对三种直接功率控制方法的动静态性能进行了实验验证和比较，为实际应用中控制算法的选择提供了理论和实验依据。

Comparison among Direct Power Control Methods for Doubly-fed Induction Generator and the Corresponding Experimental Study

Conventional table-based single-vector direct power control (SDPC) has been widely studied in the power generation control of doubly fed induction generator (DFIG) due to the merits of simple structure and quick dynamic response. However, it also has the drawbacks of high sampling frequency, variable switching frequency and high steady ripples. In this paper, on the basis of the SDPC, the concept of duty cycle optimization is introduced into the direct power control of DFIG, and the double vector direct power control is deeply studied to achieve fast dynamic response with reducing the steady state power ripple. An experimental setup is built to verify and compare the steady state and dynamic performance of the three kinds of DPC methods, which provides theoretical and experimental proof for the selection of control algorithm in practical applications.