摘要
在电动机车牵引领域,IGBT的开关频率小于1k Hz,考虑功率模块的损耗和散热能力,通常采取异步→分段同步→方波的多模式SVPWM。本文基于设计的优化同步PWM算法,提出一种改进型定子磁链轨迹跟踪矢量控制,通过分析计算优化开关角与定子磁链轨迹间的数学关系,以保持定子磁链幅值恒定作为切换控制准则,简化了切换过程的脉冲生成方式,并同时实现电流谐波畸变率(THD)最小和PWM算法无冲击切换。最后通过Matlab/Simulink对本文控制算法进行了计算机仿真验证。
In the field of electric locomotive traction, IGBT switching frequency is less than lkHz. The asynchronous SVPWM and segment synchronization SVPWM and square wave usually adopted considering the power module＇s loss and heat dissipation. An improved stator flux trajectory tracking vector control algorithm was proposed based on the designed optimized synchronous PWM algorithm. The mathematical relationship between the switching angle and the stator flux linkage was calculated and analyzed. The pulse generation method during switching transition was simplified by means of keeping the stator flux amplitude constant as the switching control criterion, and the minimum current harmonic distortion （THD） and PWM algorithm smooth switching were achieved. Finally, the computer simulation of the proposed control algorithm was verified by Matlab/Simulink.
出处
《变频器世界》
2018年第1期73-78,共6页
The World of Inverters
关键词
低开关频率
优化同步PWM
定子磁链轨迹
切换控制
Low switch frequency
Optimized synchronous PWM
Stator flux trajectory
Switching control
