Journal of Power Electronics

The Korean Institute of Power Electronics (전력전자학회)
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MMC-modified sub-module structure with double reverse blocking IGBTs

  • Yiqi Liu (College of Mechanical and Electrical Engineering, Northeast Forestry University) ;
  • Zhaoyu Duan (College of Mechanical and Electrical Engineering, Northeast Forestry University) ;
  • Qichao Chen (The State Grid Economic and Technological Research Institute Co., Ltd.) ;
  • Bingkun Li (College of Mechanical and Electrical Engineering, Northeast Forestry University) ;
  • Mingfei Ban (College of Mechanical and Electrical Engineering, Northeast Forestry University) ;
  • Zhenjie Li (College of Mechanical and Electrical Engineering, Northeast Forestry University)
  • Received : 2022.05.17
  • Accepted : 2022.10.17
  • Published : 2023.03.20
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Abstract

In high-voltage direct current (HVDC) systems, among the voltage source converters (VSCs), the modular multilevel converter (MMC) is a popular choice for power transmission. Unfortunately, the conventional half-bridge sub-module (SM) cannot deal with DC faults by itself. Thus, improved SM topologies enabling DC fault ride-through are significant. With this in mind, an MMC-modified SM structure is presented with double reverse blocking IGBTs (DRBSM). When all of the IGBTs in an MMC are blocked, the DRBSM can insert two capacitors in series to the fault circuit to rapidly overcome the DC fault. First, the DRBSM topology and working principle are analyzed. Second, the DRBSM control strategy is illustrated. Third, the device withstand voltage, DC fault ride-through, cost, and loss performance of the DRBSM are presented in detail. Finally, according to simulation results, the DRBSM fault ride-through speed is shown to be as fast as the full-bridge SM, and faster than the clamp double SM. In addition, experimental results validate the feasibility of the proposed DRBSM structure.

Keywords

Acknowledgement

This research was supported by the National Natural Science Foundation of China (52277171) and the Heilongjiang Postdoctoral Program (LBH-Q21052).

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