Smooth Integration of Rectifier-Battery Banks Operation in Real-Life Isolated Microgrids Based on Renewable Sources: Theory and Application

Isolated microgrids need dispatchable energy sources to ensure continuity of service during lack of the renewable energy sources. One common source is the diesel generator which is used as a backup and for battery charges. Practical experiences have shown that microgrids have operation problems when...

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Bibliographic Details
Published in:IEEE transactions on smart grid 2022-09, Vol.13 (5), p.3383-3393
Main Authors: Oliveira, Hercules Araujo, de Matos, Jose Gomes, de Souza Ribeiro, Luiz Antonio, Saavedra, Osvaldo Ronald, de Andrade Lorencato, Alexandre, Martins, Alexandre Saccol, de Paula Assuncao Pinheiro, Lucas
Format: Article
Language:English
Subjects:
Alternative energy sources
Batteries
Circuits
Commutation
Costs
Decoupling
Diesel generators
Distortion
Distributed generation
Energy resources
Energy storage
Generators
harmonic distortion
Microgrid
Microgrids
Notch filters
Notches
Operating costs
power quality
Reactance
Rectifiers
Renewable energy sources
Self excitation
Voltage distortion
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Summary:Isolated microgrids need dispatchable energy sources to ensure continuity of service during lack of the renewable energy sources. One common source is the diesel generator which is used as a backup and for battery charges. Practical experiences have shown that microgrids have operation problems when diesel generators and rectifiers work together to charge battery banks. This is because of resulting diesel generator voltage distortions caused by the interaction of line currents harmonics with equivalent series reactance of the AC source and the notches introduced during the current commutation between 2 SCRs of the bridge rectifier. These distortions eventually inhibit the rectifier operation, causing malfunctioning of the system. One solution is to use generators with rated power greater than the rectifiers, which results in oversized installation and high operating costs. This work proposes a solution to avoid generator oversizing by using resonant filters, notch filter and a capacitive reactive compensation circuit to avoid self-excitation of the generator. Soft-start operation of the rectifier, and disturbance decoupling in the generator are also proposed. The design allows the use of generators and rectifiers of similar power, reducing the installation and operation costs of microgrids. It has been used successfully in two real-life microgrids.
ISSN:1949-3053
1949-3061
DOI:10.1109/TSG.2022.3171447