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Xuan Y.,ZJEPC Zhoushan Power Supply Company of SGCC | Zheng X.,ZJEPC Zhoushan Power Supply Company of SGCC | Cheng B.,Zhejiang University | Xu Z.,Zhejiang University
Gaoya Dianqi/High Voltage Apparatus | Year: 2014

To analyze the transient overvoltage caused by single-phase short circuit or three-phase short circuit in AC submarine cable system, simulation models were built on the platform PSCAD/EMTDC. For the neutral point grounded AC submarine cable system rated at 110 kV and the neutral point isolated AC submarine cable system rated at 35 kV, the overvoltage was calculated in the conditions of different transmission power, transmission distance, and short circuit capacity, and the relationship between the maximum overvoltage and these variables was analyzed. Moreover, the physical mechanism was discussed. This study may provide a reference for determining system parameters and insulation levels of submarine cable lines and substations.


Yi X.,Zhejiang University | Li N.,Zhejiang University | Zheng X.,Zhejiang University | Yaowei X.,ZJEPC Zhoushan Power Supply Company of SGCC | Zheng X.,ZJEPC Zhoushan Power Supply Company of SGCC
POWERCON 2014 - 2014 International Conference on Power System Technology: Towards Green, Efficient and Smart Power System, Proceedings | Year: 2014

Modular multilevel converter (MMC) has the advantage of simple modulation, low switching-frequency and low harmonic component. It has been widely used in VSC-HVDC systems, especially the power transmission across sea. This paper introduces MMC average value model (AVM), and modifies the DC-side AVM to present a simplified method of transient calculating during the process of DC fault. This method lightens the burden in calculation, and the simulation result of the AVM shows a good consistency with that of the detailed model. © 2014 IEEE.

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