基于增广递推最小二乘的电网等效惯量在线估计方法

doi:10.3969/j.issn.1008-0198.2024.04.006

湖南电力 ›› 2024, Vol. 44 ›› Issue (4): 40-46.doi: 10.3969/j.issn.1008-0198.2024.04.006

基于增广递推最小二乘的电网等效惯量在线估计方法

刘永刚¹, 汪婧文², 吴晋波³, 孙铭锐², 廖帮昆², 文云峰²

1.国网湖南省电力有限公司,湖南长沙 410004;
2.湖南大学电气与信息工程学院,湖南长沙 410082;
3.国网湖南省电力有限公司电力科学研究院,湖南长沙 410208

收稿日期:2024-04-11 修回日期:2024-05-11 出版日期:2024-08-25 发布日期:2024-09-09
通信作者: 文云峰(1986),男,博士,教授,博士生导师,研究方向为低惯量电力系统运行与规划、频率稳定分析与控制。
作者简介:刘永刚(1969),男,本科,高级工程师,研究方向为电力系统调度。汪婧文(2001),女,硕士,研究方向为电力系统惯量在线评估。吴晋波(1981),男,博士,正高级工程师,研究方向为电网保护、控制与自动化等。孙铭锐(2002),男,硕士,研究方向为电力系统惯量在线评估。廖帮昆(1999),男,博士,研究方向为低惯量电力系统频率稳定分析与控制。
基金资助:
国家自然科学基金项目(52077066);国网湖南省电力有限公司科技项目(5216A5220023)

An Online Estimation Method of Power Grid Equivalent Inertia Based on Augmented Recursive Least Squares

LIU Yonggang¹, WANG Jingwen², WU Jinbo³, SUN Mingrui², LIAO Bangkun², WEN Yunfeng²

1. State Grid Hunan Electric Power Company Limited,Changsha 410004, China;
2. School of Electrical and Information Engineering,Hunan University, Changsha 410082, China;
3. State Grid Hunan Electric Power Company Limited Research Institute,Changsha 410208,China

Received:2024-04-11 Revised:2024-05-11 Online:2024-08-25 Published:2024-09-09

摘要/Abstract

摘要： 针对高比例非同步电源接入下电网等效惯量水平感知难题,提出一种基于量测数据的电网等效惯量在线估计方法。首先,利用发电机有功功率变化及节点频率数据,采用带外部输入的自回归滑动平均(auto regression and moving average model with exogenous input,ARMAX)模型对各区域/整个电网有功-频率动态变化进行建模。进而,基于增广递推最小二乘(recursive extended least squares,RELS)算法实现自回归滑动平均模型中未知参数的求解,辨识得到系统或区域惯性常数的估算值。此外,考虑区域间交流联络线提供的惯量支撑,对出现不平衡功率扰动后的区域惯量通过联络线耦合现象进行估计和分析。最后,基于某省级电网实际数据进行仿真测试,验证了所提方法的正确性和有效性,并对互联区域联络线提供的惯量支撑进行了分析。

关键词: 等效惯量, 自回归滑动平均模型, RELS算法, 频率, 联络线

Abstract: In this paper, an online estimation method of equivalent inertia based on measurement data is proposed to solve the problem of equivalent inertia level perception under high proportion of non-synchronous power supply. Firstly, using the data of generator active power change and node frequency, auto regression and moving average model with exogenous input(ARMAX)model models active power-frequency dynamic changes in each region/whole power grid. Furthermore, the recursive extended least squares (RELS) algorithm is used to solve the unknown parameters in the ARMAX model, and the estimated values of the inertia constant of the system or region are identified. In addition, considering the inertia support provided by the interregional contact line, the coupling phenomenon of regional inertia through the contact line after unbalanced power disturbance is estimated and analyzed. Finally, based on the actual data of a provincial power grid, the correctness and effectiveness of the proposed method are verified by simulation tests, and the inertia support provided by the interconnecting regional lines is analyzed.

Key words: equivalent inertia, ARMAX model, RELS algorithm, frequency, tie-line

中图分类号:

TM711

刘永刚, 汪婧文, 吴晋波, 孙铭锐, 廖帮昆, 文云峰. 基于增广递推最小二乘的电网等效惯量在线估计方法[J]. 湖南电力, 2024, 44(4): 40-46.

LIU Yonggang, WANG Jingwen, WU Jinbo, SUN Mingrui, LIAO Bangkun, WEN Yunfeng. An Online Estimation Method of Power Grid Equivalent Inertia Based on Augmented Recursive Least Squares[J]. Hunan Electric Power, 2024, 44(4): 40-46.

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基于增广递推最小二乘的电网等效惯量在线估计方法

An Online Estimation Method of Power Grid Equivalent Inertia Based on Augmented Recursive Least Squares

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