PWM整流器在变速恒频风力发电系统中的应用

变速恒频风力发电系统要求励磁电源有良好的输入、输出特性和能量双向流动的能力.交-直-交双PWM变频器是理想的励磁电源,而PWM整流器是其中一项关键技术.文章从三相电压型PWM整流器主电路拓扑结构出发,建立了基于三相静止坐标系和两相同步旋转坐标系的数学模型.阐述了电压、电流双闭环控制的基本原理和空间矢量脉宽调制技术在三相PWM整流器中的应用.在Matlab/Simulink环境下,对其进行了单位功率因数整流和逆变的仿真研究.结果证明,该整流器是满足交流励磁需要的理想整流电源.

Application of PWM rectifier in VSCF wind power system

In the variable-speed constant-frequency(VSCF)wind power system,the AC excita- tion power supply should possess excellent input and output performance and bi-direction flowing ability of energy.The back-to-back PWM converter is the optimum scheme of AC excitation pow- er source in which the PWM rectifier is the key technology.This paper analyzes the mathematical model based on the three-phase static coordinate and the two-phase synchronous rotational coor- dinate according to the topological structure of the main circuit.The principle of the two closed- loop control and the application of the space vector pulse width modulation in the three-phase VSR are also studied.Simulation of the unity power factor rectification and inversion under the environment of Matlab-Simulink were carried out.The results verify that the three-phase VSR can provide sinusoidal input current with unity power factor.