Abstract
In order to overcome the problems of power flow control and fault current limiting in multi-terminal high voltage direct current (MTDC) grids, this paper proposes a modular multi-terminal DC power flow controller (MM-DCPFC) with fault current limiting function. The topology structure, operation principle, and equivalent circuit of MM-DCPFC are introduced, and such a structure has the advantages of modularity and scalability. The power balance mechanism is studied and a hierarchical power balance control strategy is proposed. The results show that MM-DCPFC can achieve internal power exchange, which avoids the use of external power supply. The fault characteristics of MM-DCPFC are analyzed, fault current limiting and self-protection methods are proposed, and the factors affecting the current limiting capability are studied. The simulation models are established in PLECS, and the simulation results verify the effectiveness of MM-DCPFC in power flow control, fault current limiting, and scalability. In addition, a prototype is developed to validate the function and control method of MM-DCPFC.
Original language | English |
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Journal | Journal of Modern Power Systems and Clean Energy |
Volume | 9 |
Issue number | 6 |
Pages (from-to) | 1375-1385 |
Number of pages | 11 |
ISSN | 2196-5625 |
DOIs | |
Publication status | Published - 1 Nov 2021 |
Bibliographical note
Funding Information:This work was supported in part by National Key R&D Program of China (No. 2018YFB0904600) and National Natural Science Foundation of China (No. 51807053).
Publisher Copyright:
© 2013 State Grid Electric Power Research Institute.
Keywords
- DC power flow controller
- Fault current limiting
- multi-terminal high voltage direct current (MTDC) grid
- power balance