Decentralized DC Voltage and Power Sharing Control of the Parallel Grid Converters in Multi-Terminal DC Power Integration System

A decentralized control scheme based on backstepping design is proposed in this paper for the grid converters of a multi-terminal dc power integration system. With the proposed method, dc bus voltage can be accurately maintained together by several converters through appropriately adjusting their tr...

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Bibliographic Details
Published in:IEEE transactions on sustainable energy 2019-10, Vol.10 (4), p.1971-1980
Main Authors: Qi, Chen, Wang, Keyou, Yang, Qinmin, Li, Guojie, Huang, Xin, Wu, Jidong, Crow, Mariesa L.
Format: Article
Language:English
Subjects:
Backstepping
backstepping design
Computer simulation
Control systems
Control theory
Converters
Data buses
dc voltage stability
Decentralized control
Dynamic models
Electric potential
Integration
Liapunov functions
Lyapunov methods
power sharing
Power system stability
Real-time systems
Stability analysis
Voltage
Voltage control
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Summary:A decentralized control scheme based on backstepping design is proposed in this paper for the grid converters of a multi-terminal dc power integration system. With the proposed method, dc bus voltage can be accurately maintained together by several converters through appropriately adjusting their transmitted power according to the power sharing ratio. The system structure is presented and its dynamic model is formulated. The decentralized control laws of the grid converters are developed step by step by designing appropriate Lyapunov functions. The dc bus voltage control and the power sharing performance of the proposed control method are evaluated both under the system normal condition and converter fault condition. Finally, the effectiveness of the proposed scheme is validated through the real-time simulations on NI-PXI platform.
ISSN:1949-3029
1949-3037
DOI:10.1109/TSTE.2018.2876800