Method for selecting neutral point grounding mode of medium voltage distribution network

The invention discloses a method for selecting a neutral point grounding mode of a medium voltage distribution network. According to the method, according to the difference of the influences of different neutral point grounding modes on the medium voltage distribution network, the reliability of the power distribution network under the different neutral point grounding modes is evaluated and compared through quantitative calculation of the line fault trip probability of the power distribution network, reliability evaluation and operating cost analysis of the power distribution network under the different neutral point grounding modes are combined, so that the optimal neutral point grounding mode of the power distribution network is selected by the way of calculating the whole life cycle cost of the power distribution network under the different neutral point grounding modes and reliability factors in a combined mode, the design and transformation engineering requirement of the medium voltage distribution network can be met, and the security and the operating maintenance efficiency of the power distribution network are improved. By the adoption of the method, the high reliability neutral point grounding mode with optimal economy can be decided on the basis that the influence of the different neutral point grounding modes on the reliability and the construction operating cost of the medium voltage distribution network is calculated.