摘要
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。
In the variable-speed constant-frequency （VSCF） wind power system, the AC excitation power supply should possess excellent input and output performance and hi-direction flowing ability of energy. The back-to-back PWM converter is the optimum scheme of AC excitation power 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 coordinate 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.
出处
《可再生能源》
CAS
2007年第6期60-64,共5页
Renewable Energy Resources
基金
内蒙古自治区自然科学基金重大项目(200711020801)
