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| Fault-Tolerant Control Strategy of Modular Multilevel DC Transformer |
| Sun Guanqun, Yin Xianggen, Lai Jinmu, Wang Zhen, Du Yunfei |
| State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 China |
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Abstract In order to improve the fault tolerance under the sub-module fault of the modular multilevel DC transformer(MMDCT), this paper proposes a fault-tolerant control strategy for the MMDCT based on single-side-dual-phase-shift control. First, this paper analyzed the working principle and power model under dual-phase-shift control of MMDCT, and the system operating characteristic under the sub-module faults was investigated. The mechanisms of the arm voltage asymmetry, submodule voltage instability and circulating current fluctuation causing by the bypass fault sub-module were revealed. Then based on the single-side-dual-phase-shift control, a fault-tolerant control strategy of MMDCT was proposed, which used the single-side-phase-shift angle in and between the primary side arm as the control variable. By balancing the average sub-module voltage of the fault arm, the system instability caused by the asymmetric arm was solved, and the arm circulation fluctuation was also suppressed. Finally, a MMC DC transformer with 10 sub-modules per arm was built in the Matlab/Simulink platform. The effectiveness of the proposed fault tolerant control strategy was verified by both the steady-state and submodule fault operation conditions.
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Received: 11 July 2020
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2022, Vol. 37 
