摘要
锁相环的控制精度取决于提取到的三相并网变流器的基波正序电压信号。针对三相电网电压不平衡、谐波污染及频率突变等情况下不能准确提取幅值、相位等信息,文中采用了正弦幅值积分器锁相环(SAI-PLL)的锁相方法,并引入了比例谐振控制(PR)环节对电压矢量的无功分量进行调节,实现阶跃信号的无静差跟踪。通过与传统锁相方法的仿真对比实验,结果显示谐波抑制效果提高30%,动态响应速度提高10 ms。表明了该方法可在复杂工况下准确提取电网电压基波信号,证实了该方法的有效性。
The control accuracy of the phase-locked loop depends on the fundamental positive-sequence voltage signal of the three-phase grid-connected converter.Aiming at the imbalanced voltage,harmonic pollution,and frequence changes in the three-phase power grid,the amplitude and phase information cannot be accurately extracted.This paper uses a phase-locked method of the SAI-PLL phase-locked loop.Proportional Resonance Control(PR)is used to adjust the reactive component of the voltage vector to realize the stepless signal tracking.Through simulation and comparison experiments with the traditional phase-locking method,the results show that the harmonic suppression effect is increased by 30%,and the dynamic response speed is increased by 10 ms.It is shown that the method can accurately extract the fundamental voltage signal of the power grid under complicated working conditions,and confirms the effectiveness of the method.
作者
郭培松
GUO Peisong(Institute of Electrical Engineering and Automation,TianGong University,Tianjin 300387,China)
出处
《电子设计工程》
2020年第24期61-65,共5页
Electronic Design Engineering
关键词
非理想电网电压
信号提取
锁相环
正弦幅值积分器
unideal grid voltage
signal extraction
Phase Locked Loop
sinusoidal amplitude integrator
