Abstract
As the essential part of high voltage direct current (HVDC) system, modular multi-level converter (MMC) can be controlled properly, which is related to the safety and stability of the whole system. In actual operation, the influence of different working conditions on the core components is not the same. In this paper, the influence of different working conditions on electronic components is analyzed based on the working principle of MMC. When establishing the system reliability model, considering different backup strategies, k/n (G) model and Gamma distribution are adopted respectively. The effects of two different backup strategies on the system are compared and the effects of the redundancy of submodules on the reliability are analyzed. If the component failure rate is determined, the increase of redundant modules can improve the reliability of the system. Under the same redundancy rate, the cold standby strategy improves the system reliability more obviously.
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