Open Access

ARTICLE

Coordinated Control Strategy of New Energy Power Generation System with Hybrid Energy Storage Unit

by Yun Zhang^1,*, Zifen Han², Biao Tian¹, Ning Chen², Yi Fan³

1 School of Mechano-Electronic Engineering, Xidian University, Xi’an, 710071, China
2 Electric Power Control Center, State Grid Gansu Electric Power Company, Lanzhou, 730030, China
3 Electric Power Control Center, State Grid Gansu Electric Power Company Zhangye Power Supply Branch, Zhangye, 734000, China

* Corresponding Author: Yun Zhang. Email:

Energy Engineering 2025, 122(1), 167-184. https://doi.org/10.32604/ee.2024.056190

Received 16 July 2024; Accepted 29 October 2024; Issue published 27 December 2024

Abstract

The new energy power generation is becoming increasingly important in the power system. Such as photovoltaic power generation has become a research hotspot, however, due to the characteristics of light radiation changes, photovoltaic power generation is unstable and random, resulting in a low utilization rate and directly affecting the stability of the power grid. To solve this problem, this paper proposes a coordinated control strategy for a new energy power generation system with a hybrid energy storage unit based on the lithium iron phosphate-supercapacitor hybrid energy storage unit. Firstly, the variational mode decomposition algorithm is used to separate the high and low frequencies of the power signal, which is conducive to the rapid and accurate suppression of the power fluctuation of the energy storage system. Secondly, the fuzzy control algorithm is introduced to balance the power between energy storage. In this paper, the actual data is used for simulation, and the simulation results show that the strategy realizes the effective suppression of the bus voltage fluctuation and the accurate control of the internal state of the energy storage unit, effectively avoiding problems such as overshoot and over-discharge, and can significantly improve the stability of the photovoltaic power generation system and the stability of the Direct Current bus. It is of great significance to promote the development of collaborative control technology for photovoltaic hybrid energy storage units.

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Keywords

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