A method for online mixed measurement of primary and secondary systems of distribution network

Abstract

The invention discloses an on-line mixing determination method of a primary system and a secondary system of a power distribution network. Initial power grid steady-state values recorded before presetting an accident sequence are read, and preset fault sequence is judged automatically and warning is sent; relay protection starting conditions are judged automatically, corresponding switches are switched on or switched off automatically, and after-operation power grid steady-state values are computed. According to the on-line mixing determination method, computing time is short, responding speed is high, operation conditions of primary equipment and secondary equipment are considered at the same time, generating process of a generated power distribution fault can be simulated, power distribution network fault time and types can be set according to needs, and especially match of trend change and backup protection of the power distribution network when switches refuse to move encountering faults can be simulated. By means of the method, fault generating process of the power distribution network can be really simulated, operation sequences of relay protection equipment and trend values of the primary equipment in each stage can be comprehensively known under the condition of single fault or multiple faults of the power distribution network, fault processing and simulation training of dispatchers can be guided, and safety running level of the power distribution network under the condition of multiple faults can be inspected.

Description

technical field [0001] The invention belongs to the technical field of power system failure and accident simulation, and in particular relates to an online mixed measurement method for primary and secondary systems of a distribution network. Background technique [0002] The existing distribution network fault simulation seldom considers the primary and secondary systems uniformly. Part of the calculation method only considers the primary system, the purpose is to check whether the primary equipment is overloaded, and some calculation methods only consider the cooperation between relay protection equipment, the purpose is to verify whether the protection setting is correct or not. The above two types of calculation methods are used in practice. The practicability under the condition of distribution network failure is poor, and it cannot truthfully reflect the actual operation status and real-time data of the equipment under the condition of distribution network failure, and ...

AI Technical Summary

Problems solved by technology

[0005] The invention provides an online mixed measurement method for the primary and secondary systems of the distribution network, which aims to solve the problem that the system operation mode becomes more and more complex and fast with the formation of the interconnection pattern of the distribution network and the gradual development of the power market. It is changeable, and the secondary equipment plays an increasingly important role in the safe operation of the power grid, especially in the event of a fault. Relying on primary equipment stability calculation or secondary equipment action verification can no longer meet the needs of the development of distribution network interconnection, and most of the current calculation tools also consider the transient process at the same time, and the calculation process is relatively complicated. As far as the power grid is concerned, traditional calculation methods are time-consuming and complex, and cannot meet the real-time computing needs of the power grid.

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