An n-1 safety evaluation method for distribution network based on safety distance and working point displacement

Abstract

The invention relates to the technical field of security distance evaluation of power distribution networks, and aims to obtain an N-1 security evaluation result of a new working point only according to the security distances and the working point displacement specific to a given power distribution network. According to the technical scheme of the invention, an N-1 security evaluation method based on security distances and working point displacement for a power distribution network is provided. The method comprises the following steps: (1) obtaining a security boundary of a security domain; (2) obtaining a geometric security distance (GSD) and a feeder security distance (FSD); and (3) implementing a security evaluation method based on the security distances and the working point displacement: I, implementing a rapid security evaluation method based on the GSD and the working point displacement; II, implementing an accurate security evaluation method based on the FSD and the working point displacement: 1) implementing a GSD calculation method; 2) implementing an FSD calculation method. The N-1 security evaluation method is mainly applied to security distance evaluation occasions of the power distribution networks.

Description

technical field [0001] The invention relates to the technical field of distribution network safety distance evaluation, in particular to a distribution network N-1 safety evaluation method based on safety distance and working point displacement. Background technique [0002] In the distribution network, safe and efficient operation has always been a concern [1]. The traditional distribution network security assessment method is mainly the N-1 simulation method [2-4], and it has been the most widely used distribution network security assessment method. The N-1 verification of the power distribution system mainly includes two scenarios: main transformer N-1 fault and feeder N-1 fault. Among them, the feeder N-1 verification is to check whether the load of the feeder or feeder section can be transferred to other connected feeders when a single feeder outlet fails; the main transformer N-1 verification is to inspect the main transformer. Whether the load can be transferred thr...

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Problems solved by technology

However, this method often requires a long calculation time, and it is difficult to guide the operation of the distribution network online.

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