Screening method for surge arrester models in flexible HVDC converter stations

Abstract

The invention discloses a method for screening types of arresters in a flexible direct-current power transmission converter station. The screening method comprises the following steps of: step 1, determining a fault situation of over-voltage of a pre-installing point of each arrester when the arresters are not installed; step 2, determining an arrester model suitable for electromagnetic transient simulation; step 3, after installing the arresters, determining the over-voltage inhibition effect, the stress of the arresters and the number of parallel arrester columns in a fault condition; step 4, determining scores of comprehensive performances of arrester type schemes; and step 5, comparing the scores of the comprehensive performances of the arresters of all alternative types provided by arrester manufacturers, and determining an optimal type scheme. According to the method, the over-voltage inhibition effect and the price cost of the arresters are taken into account, the economic cost and the protective effect of the arresters are considered, and the comprehensive performance of each arrester is reasonably evaluated, so that the optimal type scheme of the arresters is determined; and the method has actual engineering significance and can be widely applied to the technical field of power transmission and distribution of power systems.

Description

technical field [0001] The invention relates to the technical field of power transmission and distribution in power systems, in particular to a method for screening arrester models of flexible direct current transmission converter stations. Background technique [0002] As the energy and environmental crisis continues to intensify, new forms of power grids, including large-scale new energy sources, are the main trend in the development of the power system. Due to the advantages of narrow transmission corridor, large transmission capacity, high voltage level, and black-start capability, flexible DC transmission projects have been widely practiced around the world. The overvoltage and insulation coordination problem of converter stations in flexible HVDC transmission projects is one of the urgent problems to be solved in practical HVDC projects. At present, the overvoltage of the DC converter station is mainly suppressed by the arrester. Therefore, the configuration scheme an...

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Problems solved by technology

[0004] At present, the national standard only makes relevant regulations on AC gapless metal oxide arresters (GB11032-2010), but there is no basis for the parameters of DC gapless metal oxide surge arresters used in flexible DC transmission projects. Most of the parameters of the arrester are directly given based on experience, and it is not known whether the parameters of the arrester are optimal or in line with the actual engineering situation

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