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Regular Paper | Open Access

Analytic Formulae for Estimating Motor Proportion of Load Model Under Small Disturbance

Ping Ju1, Shiqiu Xia1, Yuqing Jin1( ), Lu Cao2
School of Electrical and Power Engineering, Hohai University, Nanjing 211100, China
East China Branch of the State Grid Corporation of China, Shanghai 200120, China
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Abstract

In the composite load model (CLM), which is commonly used in China, an equivalent motor and equivalent static load are used to represent all electrical equipment and networks connected to a load bus. Existing research has determined typical values of electrical and mechanical parameters for load models of different load types, which improves the basis for load modeling. However, the motor proportion parameter is not the same for different load buses or at different times; therefore, obtaining the actual motor proportion is key to establishing an accurate load model. In the existing load modeling method, motor proportion is commonly identified along with other parameters under rare large disturbances; therefore, the value of the motor proportion is fixed by the time when a large disturbance occurs. In this paper, formulae are derived to estimate motor proportion under small disturbances, and these formulae allow direct calculation of motor proportion without using any optimization algorithm. The proposed estimation formulae do not rely on any parameters of load model or power system but instead rely only on measurement of the voltage and active power at steady-state points before and after a small disturbance. Because of universality of small disturbances in power systems, estimating time-varying motor proportion under small disturbances will be helpful for solving the time-varying problem of load models. Finally, the proposed motor proportion estimation formulae are validated by simulations, physical experiments, and field experiments.

Keywords

Composite load modelload modelingmotor proportionparameter estimation

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CSEE Journal of Power and Energy Systems
Volume 10 Issue 4,
July 2024
Pages 1599-1607
DOI: 10.17775/CSEEJPES.2021.07660
Cite this article:
Ju P, Xia S, Jin Y, et al. Analytic Formulae for Estimating Motor Proportion of Load Model Under Small Disturbance. CSEE Journal of Power and Energy Systems, 2024, 10(4): 1599-1607. https://doi.org/10.17775/CSEEJPES.2021.07660

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Received: 13 October 2021
Revised: 27 February 2022
Accepted: 24 March 2022
Published: 25 January 2023
© 2021 CSEE.

This is an open access article under the CC BY-NC-ND license (http://creativecommons.org/licenses/by-nc-nd/4.0/).
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