基于定子电压定向矢量控制系统的改进研究

Research on the Improvement of Stator Voltage Oriented Vector Control System

本文在风力机和双馈感应电机(DFIG)的基本原理的基础上,建立了风力机的数学模型和基于定子磁链定向的双馈风力发电机动态数学模型;针对传统的DFIG定子电压定向的矢量控制系统中PI控制器对于复杂系统其参数难以修正的问题,对传统的DFIG定子电压定向的矢量控制系统进行改进,加入模糊控制器,将模糊控制器与传统PI控制器相结合,用模糊控制器修正PI控制器的参数,缩短跟踪控制时间,控制风力发电系统的输出有功功率能够快速跟踪参考功率。仿真结果表明经改进的定子电压定向的矢量控制系统相较于传统的DFIG定子电压定向的矢量控制系统具有跟踪速度快、超调量小的优点,验证了控制系统的可行性。

The paper starts with the basic principles of wind turbine and the doubly-fed induction machine （DFIG）, establishs the mathematical model of wind turbine and a doubly-fed wind generator dynamic mathematical model based on the stator flux oriented. In view of the PI controller of the traditional DFIG stator voltage oriented vector control system for complex systems with parameter is difficult to fix problems, this paper, improves the traditional DFIG stator voltage oriented vector control system. It joins the fuzzy controller, combining fuzzy controller and PI controller, with revised PI controller parameters of the fuzzy controller, to control the wind power generation system output active power to fast track the reference power. The simulation results show that the improved stator voltage oriented vector control system compared with the traditional DFIG stator voltage oriented vector control system has the advantages of fast tracking speed and less overshoot, verify the feasibility of control system.