Parallel Control Method Based on the Consensus Algorithm for the Non-Isolated AC/DC Charging Module

A high-power charging station for electric vehicles usually adopts a parallel structure of multiple power modules. However, due to the parameter differences among power modules, a parallel system always has circulating current issues. This paper takes a non-isolated AC/DC charging module as the rese...

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Bibliographic Details
Published in:Energies (Basel) 2018-10, Vol.11 (10), p.2828
Main Authors: Zhu, Yixin, Wang, Tao, Xiong, Liansong, Zhang, Gaofeng, Qian, Xin
Format: Article
Language:English
Subjects:
Algorithms
Alternating current
Automation
Block diagrams
Charging
Clean energy
Communication
Compensation
consistency algorithm
current sharing
Direct current
Electric bridges
Electric filters
Electric potential
Electric vehicles
Energy storage
Harmonics
Inductors
Low currents
Mathematical models
Methods
parallel connection
Power factor
Reactive power
three phase rectifier
Vectors (mathematics)
Voltage
zero sequence current
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Summary:A high-power charging station for electric vehicles usually adopts a parallel structure of multiple power modules. However, due to the parameter differences among power modules, a parallel system always has circulating current issues. This paper takes a non-isolated AC/DC charging module as the research object and proposes a current sharing control strategy for multiple power modules based on the consensus algorithm. By constructing a sparse communication network with the CAN (Controller Area Network) protocol and exchanging current information, accurate current sharing among power modules is realized. Firstly, the zero-sequence circulating current issue is analyzed through a parallel model of the three-phase rectifier, with an improved circulating current restraint strategy proposed based on the zero-sequence voltage compensation. Then, the principle of the consensus algorithm is explained, which is applied to the current sharing control of multiple power modules. Finally, the proposal is tested by the designed simulation and experimental cases. From the obtained results, it can be seen that the proposed control strategy can effectively realize accurate current sharing among multiple power modules and well restrain the zero-sequence circulating current at the input side.
ISSN:1996-1073
1996-1073
DOI:10.3390/en11102828