期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 30, 期 2, 页码 524-531出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2014.2334055
关键词
Closed-loop precharge control; modular multilevel converter (MMC); start-up scheme
资金
- National Natural Science Foundation of China [51237002]
- Power Electronics Science and Education Development Program of Delta Environmental and Educational Foundation
This letter respectively presents two closed-loop precharge control methods to fully charge the submodule (SM) capacitors of the modular multilevel converter (MMC) during dcside and ac-side start-up processes. The proposed methods are aimed at regulating a constant charging current thus reducing the start-up time and eliminating the inrush current. Besides, capacitor voltage balancing control is also embedded into the controller to equally charge the SM capacitors. Due to the flexibility of the closed-loop control, these methods are applicable to any MMC applications regardless of the number of SMs. Finally, effectiveness of the proposed methods is verified experimentally on a three-phase prototype of MMC.
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