三电平变流器脉冲发生器的研制

DEVELOPMENT OF PULSE GENERATOR FOR THREE-LEVEL POWER CONVERTER

三电平变流器脉冲发生器是用户电力统一调节器 (UCPC)的重要部件之一。文中介绍了研制成功的基于数字信号处理器 DSP(TMS32 0 C31 )的电压空间矢量脉宽调制 (PWM)的高性能三电平变流器脉冲发生器 ,分析了三电平电压空间矢量 PWM的基本原理及开关矢量选择及优化原则、扇区内的区域划分法、中点电位的控制方法、窄脉冲的避免方法等技术关键 ,给出了基本的硬件结构。

Pulse generator for three--level converter is one of the important ele ments of the unified custom power conditioner(UCPC). In this paper. the successfully developed high quality pulse generator f or three--level converter based on digitalsignal processing (TMS320C31) and space voltage vector pulse width modulation (P WM) is introduced. The basic theory ofthe three--level space voltage vector PWM and the relevant key problems are anal yzed. The latter includes the principle ofselecting and optimizing the pulse vector. the method of dividing the sector reg ion. the method of controlling the neutral pointvoltage and the method of avoiding the narrow pulse. etc. The basic hardware str ucture and the method of its implementationas well as the experimental results are also presented.