摘要
在交流励磁变速恒频发电系统中,交直交双向PWM 变频器作为交流励磁电源具有很好的应用前景,而其中高频 PWM 整流器是其中的一项关键技术。为了提高三相 PWM 整流器的动、静态性能,本文首先建立了三相电压型 PWM 整流器的数学模型,并对其矢量控制策略进行了分析,在此基础上提出了一种简单的电压空间矢量算法,该算法根据参考电压矢量在αβ 坐标系上的分量直接计算电压空间矢量在各个扇区内的作用时间。实验结果证明,该整流器能够获得单位功率因数的正弦输入的电流,稳定的直流输出电压和快速的动态响应,能够实现能量的双向流动,是满足交流励磁需要的理想整流电源。
As an AC power source, the back-to-back PWM converter has good practical prospects for AC-excited variable-speed constant-frequency generation system, where in high-frequency PWM rectification is a key technology. To improve the steady and dynamic performance of the three-phase PWM rectifier, the mathematical model of space vector PWM of the three-phase voltage-source rectifier is set up at first in this paper. The vector control strategy for rectifier is analyzed in detail. A simplified algorithm is proposed for space voltage vector time. The algorithm directly calculates the duty cycles of space voltage vector tracking the reference voltage vector in each sector in the space vector plane in the conventional methods. Sinusoidal input current with unit power factor, steady output DC-voltage and dynamic response, as well as bi-direction power flowing ability shown in the experiment show that converter is an ideal rectifying power supply for AC-excited generator.
出处
《船电技术》
2005年第1期31-34,共4页
Marine Electric & Electronic Engineering
