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Energies 2017, 10(12), 1951; https://doi.org/10.3390/en10121951

Dynamic Equivalent Modeling of a Grid-Tied Microgrid Based on Characteristic Model and Measurement Data

1
Jiangsu Key Laboratory of Power Transmission & Distribution Equipment Technology, Hohai University, Changzhou 213022, Jiangsu, China
2
College of IOT Engineering, Hohai University, Changzhou 213022, Jiangsu, China
*
Author to whom correspondence should be addressed.
Received: 17 October 2017 / Revised: 11 November 2017 / Accepted: 20 November 2017 / Published: 24 November 2017
(This article belongs to the Special Issue Sustainable and Renewable Energy Systems)
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Abstract

Microgrids can significantly improve the utilization of distributed generation (DG) and the reliability of the power supply. However, in the grid-tied operational mode, the interaction between the microgrid and the distribution network cannot be ignored. The paper proposes an equivalent modeling method for the microgrid under grid-tied mode based on a characteristic model. It can simplify the microgrid model in the numerical simulation of the distribution network. The proposed equivalent model can present the dynamic response of a microgrid but not miss any of its primary characteristics. The characteristic model is represented by a low-order time-varying differential equation with the same characteristics of the original microgrid system. During the modeling process, the voltage and the power exchanged between the microgrid and distribution network are collected as the training data for the identification of model parameters. A recursive damped least squares algorithm (RDLS) is used for the parameter identification. A microgrid system containing different DGs is built to test the proposed modeling method in DIgSILENT, and the results show that the proposed dynamic equivalent modeling method is effective and the characteristic model can present the dynamic behaviors of the detailed model of a microgrid. View Full-Text
Keywords: power system; dynamic equivalent modeling; characteristic model; measurement data; microgrid power system; dynamic equivalent modeling; characteristic model; measurement data; microgrid
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Cai, C.; Liu, H.; Dai, W.; Deng, Z.; Zhang, J.; Deng, L. Dynamic Equivalent Modeling of a Grid-Tied Microgrid Based on Characteristic Model and Measurement Data. Energies 2017, 10, 1951.

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