双随机PWM在混合励磁风力发电机中应用.pdfVIP

双随机PWM 在混合励磁风力发电机中的应用 王世伟，安忠良 （沈阳工业大学 国家稀土永磁电机工程技术研究中心 沈阳 110870） 摘要：应用随机脉宽调制(pulse width modulation，PWM)方法可以使逆变器的输出电压频谱呈连续分布而不影响基波 分量，这样由逆变器供电的混合励磁风力发电机的声学噪声和机械振动就会大大减小。该文提出一种用于驱动感应 电机的随机频率PWM 逆变器，并给出了可实现的设计程序。首先分析随机信号对逆变器输出电压频谱的影响，其次， 进行相关的量化设计；最后采用Simulink 仿真和实验的手段对整个系统进行了分析。仿真和实验结果表明该文提出 的随机开关频率脉宽调制(random frequency PWM，RFPWM)设计方案中，逆变器输出电压的频谱是均匀随机分布的， 而且声学噪声和机械振动都得到有效抑制。 关键词：随机脉宽调制 ，混合励磁风力发电机 Application of Dual Randomised PWM Modulation in Hybrid Excitation of wind Generator Shiwei Wang , Zhongliang An （National Engineering Research Center for REPM Electrical Machines, Shenyang University of Technology Shenyang, Liaoning, 110870 China) Abstract—Random pulse width modulation(RPWM)can make the harmonic spectrum of inverter output voltage be continuously distributed without affecting the fundamental frequency component ,and thus the acoustic noise and mechanical vibration of an inverter fed Hybrid Excitation of wind Generator are greatly reduced. A random frequency PWM(RFPWM)inverter and its practical design procedure are presented. First, the effects of the attributes of random signal on the inverter output harmonics spectrum distribution characteristics are analyzed. The quantitative design, Simulink simulation and implementation of the proposed RFPWM inverters are introduced. The simulated and measured results indicate that the harmonic peaks are greatly reduced, thus smaller acoustic noise and mechanical vibration are obtained by the proposed RFPWM scheme Keywords-RPWM;HybridExcitationofwindGenerator Keywords-RPWM;HybridExcitationofwindGenerator KKeeyywwoorrddss--RRPPWWMM;;HHyybbrriiddEExxcciittaattiioonnooffwwiinnddGGeenneerraattoorr 过冲的展开，是一个高频衰减振荡。因此，电力 1 1 11 引言