Power Distribution Control Framework for Renewable Energy Architecture with Battery-Supercapacitor Based Hybrid Energy Storage Systems

Weiyue Huo,Jihong Zhu,Ji Zhou

doi:10.3390/en14248312

Abstract

Due to the intermittence and randomness of the renewable energy, hybrid energy storage system is widely adopted to suppress the power fluctuation. Power distribution is crucial for the robust and efficient operation of hybrid energy system. This paper proposes an innovative framework for hybrid energy storage system power distribution combining main circuit topology, modulation method and power distribution strategy. Firstly, hybrid modulation strategy to realize power distribution in a single-phase inverter is introduced. Then, power load prediction and low frequency filter are utilized to generate references for power distribution. Finally, the simulation model is established to test the framework and the result demonstrates the superiority of the proposed framework. The mean absolute percent error of the proposed SSA-LSTM mdoel is 0.0955 and the prediciton error by 40% compared with conventional LSTM model. Additionally, the energy management framework can adjust the port power distribution ratio flexibily to significantly suppress the power fluctuation of the grid and the operation cost of the hybrid energy storage system by reducing the charge and discharge cycle of the battery.

Highlights

Under the dual pressure of excessive fossil energy consumption and environmental degradation, the renewable energy systems with distributed generator (DG) such as solar photovoltaic (PV) and wind turbine (WT) have aroused wide attention in the recent years [1]
An framework for power distribution in hybrid energy storage system (HESS) has been introduced innovatively. This framework is synthetically considered among the main ciruit topology, the modulation method and the power distribution strategy
The Sparrow Search Algorithm (SSA)-long-short-term memory (LSTM) algorithm is used to obtain the total power output of the HESS, which will be divided into two parts based on frequency by Low pass filter (LPF)

Summary

Introduction

Under the dual pressure of excessive fossil energy consumption and environmental degradation, the renewable energy systems with distributed generator (DG) such as solar photovoltaic (PV) and wind turbine (WT) have aroused wide attention in the recent years [1]. The generated energy of DG is subject to environmental factor like solar irradiance, temperature and weather [3], which poses threat to the stability of the main grid. To deal with this problem, the large scale distributed energy storage units are usually utilized to suppress the fluctuations in energy production and electric power load to improve the reliability and robustness of microgrids [4,5]. As a remedy to that issue, hybrid energy storage system (HESS) with multiple types of energy storage devices is becoming mainstream

Methods

Results

Conclusion