摘要
该文针对单相并网系统提出了一种基于微分环节的锁相环方法。将微分环节与二阶滤波环节相结合所构造出的正交信号发生器,能有效地抑制谐波,且不依赖于频率反馈。通过采用两个微分环节能够实现精确的鉴相,进而通过合理设计参数可以实现性能优良的锁相环。该文首先建立了锁相环的数学模型,接着对其性能进行了详细论证。最后,研究了数字算法的实现,并针对离散化过程所带来的误差进行了补偿。该文基于Matlab/Simulink完成了锁相环的仿真,并通过数字信号处理(digital signal processor,DSP)完成了相关实验。仿真与实验结果表明,该文提出的锁相环具有很好的谐波滤除能力及动态性能。该锁相环方法适用于各种单相并网系统。
This paper presented a new phase locked loop method based on differentiator units, which could be used for single-phase grid-connected systems. Combining the differentiator unit with second order filters, the quadrature signal generator was realized. It produced in-quadrature signals with no help of frequency feedback and rejects harmonics effectively. Furthermore, the phase detector was constructed with two differentiator units so as to output accurate phase information of input signal. The good performance of phase locked loop could be realized by optimal parameters design. This paper firstly established the model of the phase locked loop (PLL) and then the detailed analysis was performed. Finally, the digital algorithm was realized and the error from the discretization was compensated. The PLL was testified by the Matlab/Simulink simulation and digital signal processor (DSP) based experimental results. Simulation and experimental results show that the phase locked loop method achieves good performance in the harmonic rejection and dynamic response. The PLL is potential to be applied in all kinds of single-phase grid-connected systems. © 2016 Chin. Soc. for Elec. Eng.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2016年第19期5318-5325,5414,共9页
Proceedings of the CSEE
关键词
单相
微分环节
锁相环
电网同步
离散化误差
Digital signal processors
Locks (fasteners)
MATLAB
Phase locked loops
Signal processing
