期刊
IEEE TRANSACTIONS ON POWER ELECTRONICS
卷 37, 期 6, 页码 7082-7099出版社
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TPEL.2021.3137906
关键词
Medium voltage; Motor drives; Switches; DC motors; Transformers; Topology; Regulation; Common mode voltage (CMV) suppression; dual dc bus; medium-voltage drive; modular multilevel converter (MMC); solid state transformer
资金
- National Natural Science Foundation of Hebei Province [E2021203162]
- Key Research and Development Program of Hebei Province [19214405D]
This article proposes a CMV suppression scheme based on DBMC-C-2-SST drive system, which achieves the natural suppression of fluctuating voltages of the three SMs of MMC using the primary triple-active-bridge of QAB, thus simultaneously achieving full suppression of ACMV and low-frequency components of SCMV.
Two types of common mode voltage (CMV) exist in medium-voltage motor drive system based on modular multilevel converter (MMC) type topology, that are, arms CMV (ACMV) and system CMV (SCMV). The former will produce circulating current between phases, and the latter will do harm to the motor. This article proposes a suppression scheme of CMV with a dual dc bus MMC-based solid-state transformer ((DBMC)-C-2-SST) based drive system. The horizontal submodules (SMs) of MMC are cascaded with a quadruple-active-bridge (QAB), then a low voltage is formed. Plus the original medium voltage bus, the system is characteristic as a dual dc bus. The primary triple-active-bridge of QAB which characterized by low-impedance and synchronous-switching helps to achieve the natural suppression of the fluctuating voltage of the MMC horizontal three SMs within the entire operating frequency range under the relevant modulation strategy, thus realizing the full suppression of ACMV and low-frequency components suppression of SCMV simultaneously, and with the additional minimum method of SCMV high-frequency components, the (DBMC)-C-2-SST can achieve zero CMV. As the SMs fluctuating voltage and CMV are decreased, the values of SMs capacitance and arms inductance can be significantly reduced.
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