Coordinated Frequency and State-of-Charge Control with Multi-Battery Energy Storage Systems and Diesel Generators in an Isolated Microgrid

Recently, isolated microgrids have been operated using renewable energy sources (RESs), diesel generators, and battery energy storage systems (BESSs) for an economical and reliable power supply to loads. The concept of the complementary control, in which power imbalances are managed by diesel genera...

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Bibliographic Details
Published in:Energies (Basel) 2019, Vol.12 (9), p.1614
Main Authors: Chang, Jae-Won, Lee, Gyu-Sub, Moon, Hyeon-Jin, Glick, Mark B., Moon, Seung-Il
Format: Article
Language:English
Subjects:
Alternative energy sources
battery energy storage system
Case studies
Diesel
diesel generator
Diesel generators
Distributed generation
Energy charge
Energy management
Energy sources
Energy storage
Fourier transforms
Generators
hierarchical control
isolated microgrid
Load
Methods
Parallel operation
renewable energy source
Renewable energy sources
State of charge
Storage systems
Strategy
Systems stability
Test systems
Wavelet transforms
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Summary:Recently, isolated microgrids have been operated using renewable energy sources (RESs), diesel generators, and battery energy storage systems (BESSs) for an economical and reliable power supply to loads. The concept of the complementary control, in which power imbalances are managed by diesel generators in the long time scale and BESSs in the short time scale, is widely adopted in isolated microgrids for efficient and stable operation. This paper proposes a new complementary control strategy for regulating the frequency and state of charge (SOC) when the system has multiple diesel generators and BESSs. In contrast to conventional complementary control, the proposed control strategy enables the parallel operation of diesel generators and BESSs, as well as SOC management. Furthermore, diesel generators regulate the equivalent SOC of BESSs with hierarchical control. Additionally, BESSs regulate the frequency of the system with hierarchical control and manage their individual SOCs. We conducted a case study by using Simulink/MATLAB to verify the effectiveness of the proposed control strategy in comparison with conventional complementary control.
ISSN:1996-1073
1996-1073
DOI:10.3390/en12091614