期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 37, 期 12, 页码 14562-14574出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2022.3186875
关键词
Energy storage; Capacitors; Modulation; Voltage control; HVDC transmission; Multilevel converters; Topology; Circulating current; energy storage requirement; energy variation; modular multilevel converter (MMC); variable dc voltage
资金
- National Natural Science Foundation of China [51977119]
An approximate analysis method is proposed for the energy storage requirement in MMC with variable dc voltages. The optimal circulating current and practical curve-fitting approach are utilized to achieve low-energy storage requirements. The simulation and experimental results validate the analysis.
The modular multilevel converter (MMC) containing full-bridge submodules (FBSMs) can increase the modulation index to reduce the energy storage requirement. The MMCs containing FBSMs can also adjust the dc voltage to fit special applications. However, limited research explores the energy storage characteristics of MMCs with variable dc voltages, and few effective approaches can ensure low-energy storage requirements. This study proposes an approximate analysis method for the energy storage requirement in MMC with variable dc voltages. Results reveal that the energy variation under low dc voltages restricts the reduction effects of the increased modulation index on the energy storage requirement. Then, on the basis of the fact that the low ac component of the arm current under low dc voltages provides a large current margin, an optimal circulating current (OCC) is proposed to optimize the energy variation under low dc voltages. In addition, a practical curve-fitting approach is proposed to facilitate the calculation of OCC in real-time controllers. With these approaches, the energy storage requirement with variable dc voltage becomes similar to that with constant rated dc voltage. Simulation and experimental results verify the analysis.
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