Operational Reliability Model of Hybrid MMC Considering Multiple Time Scales and Multi-state Submodule

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