An Equivalent Inertia Evaluation Method of Power System Based on Power Spectral Density Analysis

被引：0

作者：

Liu J. ^{[1
]}

Zhao H. ^{[1
]}

Li M. ^{[1
]}

Du Z. ^{[1
]}

Yang D. ^{[1
]}

Yao W. ^{[3
]}

机构：

[1] State Grid Hubei Electric Power Company Limited Economic Research Institute, Wuhan

[2] State Grid Wuhan Electric Power Supply Company, Wuhan

[3] State Key Laboratory of Advanced Electromagnetic Engineering and Technology, School of Electrical and Electronic Engineering, Huazhong University of Science and Technology, Wuhan

来源：

Gaodianya Jishu/High Voltage Engineering | 2022年 / 48卷 / 01期

关键词：

Frequency; Inertia; Nonlinear least squares; Novel power system; Power spectral density; Renewable energy;

D O I：

10.13336/j.1003-6520.hve.20211092

中图分类号：

学科分类号：

摘要：

The inertia of a power system is one of the important indicators to measure the frequency stability. The renewable energy units lack the inertia response capability similar to conventional synchronous generator units, thus the large-scale grid connection of renewable energy will reduce the equivalent inertia of the power grid, and the low inertia of the power grid will easily cause frequency safety accidents. In the process of constructing a novel power system with renewable energy as the main body, it is an important technical means to effectively evaluate the equivalent inertia of power grid.It will help to prevent the risk of frequency instability. Thereby, this paper proposes a power system equivalent inertia evaluation method by power spectral density analysis. This method theoretically derives the mathematical correlation between the equivalent inertia of the system and the power spectrum density of frequency fluctuations under the random noise disturbance. Then the frequency fluctuations of the power grid is measured and its power spectrum density is obtained. According to the mathematical relationship between the equivalent inertia of the system and the power spectral density of frequency fluctuations, nonlinear least squares fitting is used to obtain the equivalent inertia of the system. The simulation results of a single-area system, four-machine two-area system and a real power grid show that the proposed method can be adopted to accurately evaluate the equivalent inertia of the system and has good engineering practicability. © 2022, High Voltage Engineering Editorial Department of CEPRI. All right reserved.

引用

页码：178 / 188

页数：10

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