Electric energy quality evaluation method of electrified railway accessed power system

Abstract

The invention relates to the technical field of the electrified railway, in particular to an electric energy quality evaluation method of an electrified railway accessed power system. The electric energy quality evaluation method adopts the following technical scheme: (1) the invention aims at obtaining a negative sequence computing method which is suitable for building single-phase load simulation of the electrified railway in power system simulation software (PSD) which is generally used in power systems, and (2) the invention aims at obtaining a method that is used for calculating the current value, which is allowed to be injected in the electrified railway by a point of common coupling, of the harmonic wave at each order in the power system in which the electrified railway traction station is accessed by way of T-type wiring. In the invention, system evaluation simulation calculation is carried out on the related problems of the electric energy quality of the electrified railway, the analysis and evaluation of related problems of the electric energy quality are provided, so as to give guiding suggestions to the design, compensation and fixed value selection and the like of theelectrified railway and the corresponding power supply system.

Description

technical field [0001] The present invention relates to the technical field of electrified railways, and in particular relates to evaluating the influence degree of the load characteristics of electrified railways on indicators such as power system voltage and harmonics before electrified railway projects are put into operation, so as to arrange control measures before project operation A method for evaluating and calculating power quality indicators of electrified railways connected to power systems. [0002] Background technique [0002] Electrified railway power system mainly includes power supply system and traction system. Due to the nonlinear, single-phase, and impact characteristics of electric locomotive loads, the development of electrified railways will have a certain impact on the power quality of the local power grid. Only by conducting systematic and in-depth research on issues related to power quality of electrified railways, and giving analysis and evaluati...

AI Technical Summary

Problems solved by technology

The negative sequence component will cause the deterioration of the operating conditions of the three-phase asynchronous motor, generate braking torque, and make it difficult to start, etc.

Excessive negative sequence components may also cause protection misoperation; harmonic problems may cause reactive power compensation to fail to operate normally due to harmonic amplification and other reasons, abnormal heating of power supply equipment such as generators and transformers, protection misoperation and automation equipment failure , can also cause interference to the communication system

At present, the evaluation of the degree of negative-sequence interference of electrified railways to the power system mainly calculates the proportion of negative-sequence capacity to system capacity, which should not be evaluated by power system simulation software

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