Dynamic Wide-frequency Measurement Algorithm Based on Improved Prony

被引：0
作者：
Liu H. [1 ]
Li J. [1 ]
Bi T. [1 ]
Xu S. [1 ]
机构：
[1] State Key Laboratory of Alternate Electrical Power System With Renewable Energy Sources, North China Electric Power University, Changping District, Beijing
来源：
Dianwang Jishu/Power System Technology | 2023年 / 47卷 / 05期
关键词：
dynamic time-varying; frequency resolution; multi-component fitting; short time window; wide-frequency measurement algorithm;
D O I：
10.13335/j.1000-3673.pst.2022.1198
中图分类号：
学科分类号：
摘要：
Large-scale access of high-proportion renewable energy and high-proportion power electronic equipment is becoming an important feature of the new generation of power systems. Subsequently, a large number of harmonics, inter-harmonics appear in the power system with obviously dynamic behavior, which poses a new challenge for wide-frequency measurements. In this paper, aiming at the problem that the measurement accuracy of existing wide-frequency measurement algorithms is not enough under dynamic conditions, a large number of field recording data are analyzed, the dynamic characteristics of wide-frequency electrical quantities in time are found, and the relationship between frequency resolution and dynamic bandwidth of wide-frequency measurement algorithms is analyzed. A dynamic wide-frequency multi-component fitting mathematical model based on polynomial is established to accurately describe the dynamic time-varying behavior of characterizing wide-frequency electrical quantities, and a short-term window dynamic wide-frequency measurement algorithm based on improved Prony is proposed, and the algorithm calculation amount is reduced by simplifying the Prony constraints. Finally, simulation tests, hardware tests and field signal analysis verification are carried out, and the results show that the proposed method can achieve accurate measurement of harmonics and interharmonics under dynamic conditions. © 2023 Power System Technology Press. All rights reserved.
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页码：2119 / 2127
页数：8
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