变速恒频无刷双馈风力发电机及其控制

Control of Variable Speed Constant Frequency Brushless Doubly Fed Wind Power Generator

通过对无刷双馈风力发电机工作原理和运行特性的分析,建立了无刷双馈发电机基于转子机械坐标系的数学模型,将变结构控制应用到无刷双馈发电机有功功率与无功功率的解耦控制中,分析了其电磁关系和能量平衡关系.使用Matlab/Simulink软件对系统及其控制策略进行了仿真分析.仿真结果表明:变结构控制能够成功地实现风力发电中无刷双馈发电机有功与无功功率的解耦控制,在实现风能的最大功率捕获的同时,可以提供电网需要的无功功率,满足电力系统的需要.

This paper analyzes the working principle and operating characteristic of brushless doubly fed wind power generator（BDFG）,and deduces the BDFG＇s mathematical model based on rotor machine coordinate,The variable structure control（VSC） is applied to the active and reactive power decoupling control of the BDFM,analysis and the relations of electromagnetism and energy balance are analyzed.Finally,simulation and analysis of the whole system and control strategy are carried out in Matlab/Simulink software.Simulation results show that the VSC method can not only realize the active and reactive power decoupling control of the BDFM to obtain the maximum wind power capture,but also adjust the reactive power of the electric grid to satisfy the requirements of the electric power system.