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Electrical stresses simulation of DC cable in ±10 kV distribution system

With the rapid development and engineering application of voltage source converters (VSC) technology, high-voltage DC cable technology has developed rapidly in the past two decades, the voltage of extruded insulation DC cables based on cross-linked polyethylene ranges from 80kV to 640kV. Due to the engineering demand of a medium voltage distribution system, the research on medium voltage DC (MVDC) cables is not very advanced. At present, the DC distribution system is an important development direction in the energy transmission sector. In order to provide a reference for an MVDC cable design, it is necessary to carry out related research on the electrical stress on MVDC cables used in a medium voltage distribution system. Based on the simplified topological structure of the distribution system, in this paper a model of an MVDC distribution system is presented and used to simulate typical faults to preliminarily determine the switching impulse voltage and lighting impulse voltage of an MVDC cable in the MVDC distribution system.