A New Method of Double Fundamental Frequency Phase-locked Loop Based On Two Integrators
In order to realize the grid connected converter to connect to the grid in unbalanced and distorted grid conditions,in this paper,based on the Sinusoidal Amplitude Integrators (Sinusoidal Amplitude Integrator,SAI),and combined with the cascaded integrators (Second Order Generalized Integrator,SOGI),a new type of double fundamental frequency PLL method is proposed.The method uses the excellent filter performance of cascaded SOGI and frequency characteristics of SAI,and under the negative rotation coordinate system,the 2 times harmonic components generated by the unbalanced grid are separated,extracted and successfully locked in.Solving the problem of the double fundamental frequency fluctuation,when the PLL method of synchronous rotating coordinate system(synchronous rotating fram-PLL,SRF-PLL) is applied on the dq axis under the unbalanced power grid.This paper introduces the basic principle of the cascaded SOGI and SAI,and the mathematical deduction is carried out.Under unbalanced and distorted conditions of the power system,the simulation results are compared with the SRF-PLL method.The results show that the proposed method is feasible,and compared with the traditional PLL method,and the method can detect and extract the synchronization signals more quickly and accurately.
Unbalanced power grid Nikai Hiroyoshi integrator (SOGI) Sinusoidal Amplitude Integrators (SAI) Negative rotation coordinate system 2 frequency multiplication phase locked loop
Zhongnan Guo Qingshan Zhang Chen Zhang Jianxia Pang Zhaoyang Yan
Key Lab of Power Electronics for Energy Conversion and Motor Drive of Hebei Province School of elect School of Mechanical Engineering North China University of Water Resources and Electric Power Zhengz
国际会议
哈尔滨
英文
659-664
2016-07-21（万方平台首次上网日期，不代表论文的发表时间）