Three-phase Grid Synchronization Algorithm Based on Adaptive Discrete Complex-variable Filter

被引：0
|
作者：
Quan X. [1 ]
Dou X. [1 ]
Wu Z. [1 ]
Hu M. [1 ]
Ma J. [2 ]
Chen K. [2 ]
机构：
[1] School of Electrical Engineering, Southeast University, Nanjing
[2] State Grid Jiangxi Electric Power Research Institute, Nanchang
来源：
Quan, Xiangjun (qxj@seu.edu.cn) | 1600年 / Automation of Electric Power Systems Press卷 / 41期
关键词：
Complex-variable filter; Frequency estimation; Grid synchronization; Grid-connected inverter; Sequence component observer;
D O I：
10.7500/AEPS20161205007
中图分类号：
学科分类号：
摘要：
As an important issue of the control algorithm for grid-connected inverters, the grid synchronization algorithm is critical to improve the control performance of grid-connected inverters. According to the design of the discrete Luenberger observer, a discrete complex-variable filter is designed to extract the sequence component. Moreover, regarding to the application of harmonics, a harmonic sequence component observer based on the structure of a multiple complex-variable filter is developed. The transfer process of the frequency error is analyzed when the input voltage frequency is different from the frequency parameter of the sequence component observer. Then the observation equation of input voltage frequency is designed, which enables the proposed sequence component observer to adapt to the change of grid frequency. In addition, an approximately linearized dynamic model is developed to facilitate the gain design of the frequency observation. Finally, simulations and experiments are carried out to verify the correctness and effectiveness of the proposed grid synchronization algorithm. The results show that the proposed algorithm is able to improve the dynamic performance of grid frequency observation while reducing the frequency observation time, and the application implementation is simple and effective with a small amount of calculation. © 2017 Automation of Electric Power Systems Press.
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页码：158 / 164
页数：6
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