摘要
针对三相电压型脉宽调制(PWM)变换器在无电网电压传感器和不平衡电网电压状况下的运行,研究了其控制策略。通过构建虚拟磁链作为PWM变换器的同步信号源实现了无电压传感器运行。通过正、负序分量分离方法,减少由输入相电压中的奇次谐波引起的直流母线电压上的偶次谐波含量,实现了PWM变换器在电网电压不平衡状况下的运行。然后通过Matlab/Simulink进行仿真和正确性验证。最后,搭建了实验平台,实现了三相电压型PWM变换器的整流与逆变工作状态。研究结果表明,该控制策略具有良好的动态响应。
Aiming at the situation that the moving of voltage-source pulse width modulation（PWM） converters without line voltage sensors under unbalanced input voltage condition,control strategy was investigated respectively.Virtual flux linkage was constructed as the synchronization source of voltage-source PWM converter.The positive and negative sequence separating method was used to reduce the even order harmonics in the dc output voltage which resulted from the odd order harmonic contents in the unbalanced input phase current.Then,the proposed control scheme was simulated and proved correctly using Matlab/Simulink.Finally,the experiment platform was built,the rectification and inversion were realized.The research result shows that the proposed control strategy has good dynamic performance.
出处
《机电工程》
CAS
2011年第8期1000-1005,共6页
Journal of Mechanical & Electrical Engineering
基金
国家科技重大专项课题资助项目(2009ZX04010-013)
关键词
脉宽调制变换器
虚拟磁链
无传感器
正、负序分量
pulse width modulation（PWM） converter
virtual flux linkage
sensorless
positive and negative sequence
