关键词: 有轨电车, 永磁牵引系统, 矢量控制, 中间60°同步调制

Abstract: Permanent magnet traction system for tramcar has the characteristics of high power and low switching frequency. In order to solve the larger low-order harmonic and the problem that asynchronous modulation are not used in the full speed range, a multi-mode PWM modulation strategy based on central 60° synchronous modulation were adopted. Based on the vector vontrol, the permanent magnet traction system for tramcar has realized smooth transition of asynchronous SPWM modulation, synchronous SPWM modulation, central 60° synchronous modulation and square wave modulation in the full speed range by adopting a multi-mode PWM modulation strategy. The current distortion rate was less than 18%, effectively reducing the current harmonics. Field experiments showed that the multi-mode PWM modulation method has good practicability and effectiveness.

Key words: tramcar, permanent magnet traction system, vector control, central 60° modulation