Acquisition method and system for short-circuit parameters of three-phase asymmetric devices of power system

Abstract

The invention discloses an acquisition method and system for short-circuit parameters of three-phase asymmetric devices of a power system. For a power grid containing three-phase asymmetric power supply devices such as a single-phase transformer, a V / V wiring traction transformer, a V / X wiring traction transformer, a Scott transformer and an impedance matching balance transformer, when short-circuit fault analysis is performed, an open self-defined fault analysis platform is established, equivalent impedance of a three-phase symmetric part of the power grid and necessary parameters of variousthree-phase asymmetric devices are open, a script language is adopted to self-define a calculation process and calculation logic of a short-circuit current and voltage, and the self-defined script language is submitted to a script interpreter of an operating system to execute calculation to obtain a needed short-circuit current and voltage result. The method has openness and extensibility, can beflexibly extended according to a new equivalent model of the three-phase asymmetric devices and is suitable for the field of practical short-circuit fault analytical calculation of the power grid containing the three-phase asymmetric devices.

Description

technical field [0001] The invention belongs to the field of short-circuit calculation and analysis of power systems, and more particularly relates to a method and system for acquiring short-circuit parameters of three-phase asymmetric equipment in a power system. Background technique [0002] In the traditional three-phase symmetrical power system, when any equipment has a three-phase symmetrical short circuit or an asymmetrical short circuit, the symmetrical component method can be used to carry out short-circuit current analysis and calculation to meet the needs of power grid equipment selection and relay protection setting calculations. The needs of the system, that is, for the three-phase symmetrical system, as long as an equal-value circuit is established for all devices, the symmetrical component method can be applied. [0003] However, with the development of electrified railways, the three-phase asymmetry of its traction power supply equipment poses a challenge to t...

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Problems solved by technology

[0008] In view of the above defects or improvement needs of the prior art, the present invention provides a method for obtaining short-circuit parameters of three-phase asymmetric equipment in a power system. The technical problem of inaccurate calculation caused by short-circuit calculation after the system

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