基于子空间法的电网暂态频率扰动惯量估计

doi:10.12204/j.issn.1000-7229.2021.02.001

电力建设 ›› 2021, Vol. 42 ›› Issue (2): 2-7.doi: 10.12204/j.issn.1000-7229.2021.02.001

• 低惯性电力系统分析与控制·栏目主持文云峰副教授 • 上一篇下一篇

基于子空间法的电网暂态频率扰动惯量估计

李浩然¹, 夏智雄², 李世春²

1.深圳供电局有限公司, 广东省深圳市 518000
2.三峡大学电气与新能源学院, 湖北省宜昌市 443002

收稿日期:2020-06-03 出版日期:2021-02-01 发布日期:2021-02-09
通讯作者: 夏智雄
作者简介:李浩然(1987),男,硕士,高级工程师,主要研究方向为电网控制运行与规划;|李世春(1984),男,博士,讲师,主要研究方向为含新能源的电力系统运行与控制。
基金资助:
湖北省自然科学基金项目(51907104);国家自然科学基金项目(2019CFB207)

Power System Inertia Estimation Based on Subspace Method Under Transient Frequency Disturbance

LI Haoran¹, XIA Zhixiong², LI Shichun²

1. Shenzhen Power Supply Bureau,Shenzhen 518000, Guangdong Province, China
2. College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, Hubei Province, China

Received:2020-06-03 Online:2021-02-01 Published:2021-02-09
Contact: XIA Zhixiong
Supported by:
Natural Science Foundation of Hubei Province(51907104);Natural Science Foundation of Hubei Province(2019CFB207)

摘要/Abstract

摘要：

针对暂态频率扰动下传统惯量估计方法受扰动发生时刻和惯性响应持续时间判断敏感而导致估计误差偏大的问题,文章提出基于子空间法的电网惯量估计思想。通过分析暂态频率扰动发生前、惯性响应及一次调频响应各阶段的电网频率响应模型的冲激响应特征,获得各阶段的电网惯量统一性表达,并将各阶段电网频率响应模型作为相同待估计系统,应用子空间法进行系统模型参数辨识,最终估计出电网惯量。通过算例分析验证了文章方法对电网惯量估计的有效性及精确性。

关键词: 暂态频率扰动, 电网惯量估计, 冲激响应, 子空间法

Abstract:

In order to solve the problem that traditional inertia estimation method under transient frequency disturbance is sensitive to the judgment of disturbance occurrence and inertial response duration, which leads to large estimation error, this paper proposes the idea of grid inertia estimation based on subspace method. By analyzing impulse response characteristics of the grid frequency response model at stages before transient frequency disturbance, inertial response and primary frequency-regulation response, the unified expression of grid inertia at each stage is obtained, and the grid frequency response model at all stages are taken as a system to be estimated. Subspace method is used to identify the parameters of the system model, and finally grid inertia is estimated. The effectiveness and accuracy of this method are verified by simulation.

Key words: transient disturbance, power system inertia estimation, impulse response, subspace method

中图分类号:

TM74

李浩然, 夏智雄, 李世春. 基于子空间法的电网暂态频率扰动惯量估计[J]. 电力建设, 2021, 42(2): 2-7.

LI Haoran, XIA Zhixiong, LI Shichun. Power System Inertia Estimation Based on Subspace Method Under Transient Frequency Disturbance[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(2): 2-7.

图/表 8

图1 电力系统频率动态调节过程

Fig.1 Power system frequency-regulation process

图2 扰动发生时刻估计与一次调频过程对惯量估计误差的影响

Fig.2 The influence of disturbance occurrence estimation and primary frequency-regulation on inertia estimation error

图3 算例系统

Fig.3 Test system

图4 发电机1端的有功-频率数据

Fig.4 Active power-frequency data at G1

表1 10~50 s暂态扰动各发电机惯性时间常数估计

Table 1 Estimation of inertia of generators during transient disturbance (10~50 s)

图5 辨识初始时刻变化时G1—G5惯量估计误差

Fig.5 Inertia estimation errors of G1-G5 with the change of initial identification moment

图6 辨识初始时刻变化时G6—G10惯量估计误差

Fig.6 Inertia estimation errors of G6-G10 with the change of initial identification moment

表A1 辨识算法与权重矩阵的对应关系

Table A1 Correspondence between algorithms and weighting matrices

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基于子空间法的电网暂态频率扰动惯量估计

Power System Inertia Estimation Based on Subspace Method Under Transient Frequency Disturbance

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