The Design of Three Phase Frequency Locked Loop Based on Linear Kalman Filter

被引：0
|
作者：
Dou X. [1 ]
Jiao Y. [1 ]
Quan X. [1 ]
Li N. [2 ]
Wu Z. [1 ]
机构：
[1] Jiangsu Key Laboratory of Smart Grid Technology and Equipment (Southeast University), Nanjing, 210096, Jiangsu
[2] Nari Group Corporation, Nanjing, 210096, Jiangsu
来源：
Zhongguo Dianji Gongcheng Xuebao/Proceedings of the Chinese Society of Electrical Engineering | 2019年 / 39卷 / 03期
基金：
中国国家自然科学基金;
关键词：
DC bias component; Frequency locked loop; Grid synchronization algorithm; Kalman filter; Three phase system;
D O I：
10.13334/j.0258-8013.pcsee.172756
中图分类号：
学科分类号：
摘要：
The effectiveness of grid synchronization algorithm is of great importance to improve the performance of grid-connected controller. A three-phase frequency-locked- loop based on linear Kalman filter (LKF-FLL) was proposed. Firstly, the validity of Kalman filter for orthogonal decomposition of voltage distortion signal with DC bias was analyzed. The analysis shows that when the frequency is a known quantity, the linear Kalman filter can be used to estimate the grid status, including frequency, positive / negative sequence and DC bias. Then the adaptive three-phase frequency-locked-loop structure was proposed through error analysis for the fundamental frequency observation. Next, using the state observer's idea to design cost function for the optimal gain coefficient, and inversely calculate Kalman filter parameters, which can avoid choosing the filter parameters according to experience only. Finally, by comparing with the existing technology, such as second-order generalized integrator (SOGI), adaptive victoria filter (AVF), the effectiveness and superiority of the proposed three-phase FLL were shown in the case of distorted three-phase voltage with DC bias. © 2019 Chin. Soc. for Elec. Eng.
引用
收藏
页码：832 / 844
页数：12
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