Journal of Modern Power Systems and Clean Energy

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Home > Archive>Volume 9, Issue 3, 2021 >648-656. DOI:10.35833/MPCE.2019.000227
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Operational Reliability Model of Hybrid MMC Considering Multiple Time Scales and Multi-state Submodule
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Affiliation:

1.State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Chongqing 400044, China;2.Chuxiong Power Supply Bureau of Yunnan Power Grid, Chuxiong 67500, China;3.Electric Power Research Institute, State Grid Qinghai Electric Power Company, Xining 810008, China

Fund Project:

This work was supported by the National Key R&D Program of China (No. 2017YFB0902200), the Science and Technology Project of State Grid Corporation of China (No. 5228001700CW), and the International Cooperation and Exchange Project of National Natural Science Foundation of China (No. 51861145406).

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    Abstract:

    Environmental and electrical factors such as wind speed, air temperature and switching frequency have significant influences on the operational reliability of hybrid modular multilevel converter (MMC), which is commonly used for the wind power transmission. However, the existing reliability model of hybrid MMC based on statistics cannot accurately reflect the impact of these factors. In this paper, a new operational reliability model of hybrid MMC is presented. The reliability index of the hybrid MMC is coupled with its operation characteristics by calculating multi-term thermal cycling. In addition, an operation strategy of hybrid MMC is proposed to improve its reliability. The multi-state submodule (SM) is developed, which is capable of bypassing specific faulty power modules instead of the whole SM. Case studies show that the proposed operational reliability model could describe the impact of environmental and electrical factors. Also, the proposed operation strategy can improve the reliability of hybrid MMC by extending the operation time of SMs.

    表 3 Table 3
    表 1 Table 1
    表 2 Table 2
    图1 Topology of a three-phase hybrid MMC.Fig.1
    图2 Variations of different factors with different time scales.Fig.2
    图3 Status of multi-state UFSM. (a) Normal state 1. (b) Normal state 2. (c) Single function state 1. (d) Single function state 2.Fig.3
    图4 Substitution relationship of SMs in hybrid MMC with multi-state SM. (a) Operation state 1. (b) Operation state 2.Fig.4
    图5 Wind speed time series.Fig.5
    图6 Air temperature time series.Fig.6
    图7 Reliability of hybrid MMC with different SM operation strategies.Fig.7
    图8 Reliability of hybrid MMC affected by wind speed and air temperature.Fig.8
    图9 Failure rate of UFSM and HBSM affected by wind speed and air temperature.Fig.9
    图10 Reliability of hybrid MMC with different switching frequencies.Fig.10
    表 5 Table 5
    表 4 Table 4
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  • Received:April 04,2019
  • Online: May 19,2021

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