In the vessel integrated power system (IPS), several common events, such as replacement of the aging batteries, isolation of fault modules, and launching of pulse loads, can make the state-of-charge (SOC) of energy storage elements (ESEs) inconsistent, which, consequently, requires different charging or discharging power commands for the ESEs to balance their SOC. Modular multilevel converter–bidirectional dc–dc converter (MMC-BDC) can be utilized in the vessel IPS to connect ESEs with the medium-voltage (MV) bus for its outstanding characteristics. However, the degree of imbalance in the module power of MMC-BDC is limited inherently, which can destabilize the system, but is usually neglected by the researchers. Therefore, this article investigates the unbalanced operating principle of a cascaded MMC-BDC. The imbalance boundary is studied. A control strategy is designed for the unbalanced operation to optimize the voltage stress of the components. A method of allocating unbalanced module power to the submodules (SMs) is raised on the basis of an imbalance boundary. A novel fast balancing charging strategy is proposed consequently. Finally, the proposed theory and strategies are verified through simulation and a 7.2-kW prototype.


    Access

    Check access

    Check availability in my library

    Order at Subito €


    Export, share and cite



    Title :

    Unbalanced Operation Principle and Fast Balancing Charging Strategy of a Cascaded Modular Multilevel Converter–Bidirectional DC–DC Converter in the Shipboard Applications


    Contributors:
    Chen, Peng (author) / Xiao, Fei (author) / Liu, Jilong (author) / Zhu, Zhichao (author) / Ren, Qiang (author)


    Publication date :

    2020-09-01


    Size :

    9391714 byte




    Type of media :

    Article (Journal)


    Type of material :

    Electronic Resource


    Language :

    English



    Operation of Modular Multilevel Converter with Distributed Energy Resources during Unbalanced Power Generation

    Nayak, Subhasis / Singh, Ravindra Kumar / Sarkar, Sukrashis et al. | IEEE | 2024


    Control of modular multilevel transformerless cascaded bidirectional converters

    Cong Wang / Guang-lin Sha / Jun Wang et al. | IEEE | 2014


    Modular multilevel converter for railway applications

    Halfmann, U. / Recker, W. | British Library Online Contents | 2011



    A novel DC charging strategy for modular multilevel converter in a HVDC system

    Sun, Zhandong / Li, Yaohua / Wang, Ping et al. | IEEE | 2014