DC Gas-Insulated Switchgear (GIS) can significantly reduce the floor area and construction and maintenance costs of traditional DC converter stations and has a good development prospect. Based on the typical converter station topology and arrester configuration scheme, this paper sets different fault conditions to assess the overvoltage stress of ±550 kV DC GIS. The simulation results show that the DC GIS will bear the highest transient overvoltage, up to 874.9 kV, when the converter station starts with an open circuit fault at the inverter side. The insulation level of DC GIS is further proposed, in which the Lightning Impulse Withstand Level (LIWL) is 1356 kV and the Switching Impulse Withstand Level (SIWL) is 1110 kV. The research results can provide a reference for the insulation design and equipment development of high voltage DC GIS.
Compared with alternating current(AC) power grid, flexible direct current(DC) power grid has obvious advantages such as good controllability, flexible operation mode, and multiple applications, which also makes it the preferred scheme for new energy grid connection. In order to ensure the reliability of flexible DC power grid, it is necessary to use high-voltage direct current(HVDC) circuit breaker for fault isolation, and it is urgent to develop and study the reliability evaluation method of HVDC circuit breaker. This paper gives the circuit topology of HVDC circuit breakers firstly, then analyzes the relationship between single component failure and overall failure in combination with component redundancy.On this basis, this paper proposes the stability evaluation index system of DC circuit breaker and establishes the stability evaluation model.
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