MMC Reliability Modeling Considering Time-Varying Failure Rate and Renewal Process of Redundant System and Its Application

doi:10.12204/j.issn.1000-7229.2022.08.010

Abstract

Abstract:

In view of the problem that the existing research on reliability of modular multi-level converter (MMC) does not fully consider time-varying failure rate of redundant system, and lacks the evaluation method for renewal process, which can not scientifically measure the reliability of MMC, this paper proposes an MMC reliability modeling method considering the time-varying failure rate and N-step renewal process of redundant system. Firstly, from the perspective of redundancy degree and redundancy mode, the classification of redundant systems is refined. According to the classification above, the mathematical analytical relationship between reliability and failure rate is established, which indicates the characteristics of the time-varying failure rate of redundant system. It is pointed out that the failure rate of redundant system obtained by traditional methods is too small. Then, N-step failure rate is used to replace the time-varying failure rate of MMC redundant system. At the same time, the renewal process theory is introduced to deduce the mean time to failure (MTTF) and steady-state availability formula of MMC, so as to correct the problem that the calculation results of traditional methods are too high. Finally, the converter of half-bridge sub-module is taken as an example to verify the effectiveness and feasibility of the proposed method.

Key words: reliability modeling, redundant system, N-step renewal process, modular multi-level converter (MMC), time-varying failure rate

CLC Number:

TM461

WU Kecheng, WANG Fengxue, WU Han, QU Yi, DONG Hong, OUYANG Sen. MMC Reliability Modeling Considering Time-Varying Failure Rate and Renewal Process of Redundant System and Its Application[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(8): 102-112.

Figures/Tables 13

Fig.1 Classification of redundant systems

Fig.2 Time-varying comparison considering failure rate or not

Fig.3 Proportion change of the mean increment of time-varying failure rate

Fig.4 The curve of N-step failure rate

Fig.5 The MMC outage model of N-step renewal process

Fig.6 The calculation flowchart

Fig.7 MMC topology based on half-bridge sub-module

Table 1 Failure rate of the internal components in MMC

Fig.8 Comparison of the selection of the failure rates of MMC redundant system

Table 2 Comparison of reliability parameters

Table 3 The impact of redundancy

Table A1 Failure rate of the internal components in MMC

Fig.A1 Comparison of failure rate of four redundant systems

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