Method for simulating coupling between vehicle and traction network and power system

Abstract

The invention discloses a method for simulating the coupling between a vehicle and a traction network and a power system, which comprises: firstly, combining the computation of the traction network and the computation of the tidal current of the traction network; secondly, every time a stable result is obtained by the iterative computations of the traction network and the power system, performing the electric vehicle simulation under the condition of a stable result; and finally, performing the correction computation of the traction network and the power system by using the result of the simulation of the electric vehicle till the electric vehicle, the traction network and the power system all reach a stable state. Compared with the conventional traction network computation method, the method for simulating the coupling between the vehicle and traction network and the power system of the invention has the advantages that: the influences of the vehicle and the power system on the traction network are taken into full consideration; on the premise of keeping good computation efficiency, the accuracy of the result of the computation of the traction network is improved greatly and made more in accordance with actual conditions; and the needs of railway / power related departments for traction power supply quality evaluation and electric quality estimation.

Description

technical field [0001] The invention belongs to the field of operation, simulation and traction power supply quality analysis of electrified railways, and in particular relates to a simulation method for coupling a locomotive, a traction network and an electric power system. Background technique [0002] In recent years, my country's high-speed railway industry has developed rapidly. The completion and opening of high-speed railways such as the Beijing-Tianjin Intercity Passenger Dedicated Line and the Wuhan-Guangzhou Passenger Dedicated Line indicate that my country's high-speed railway technology has entered a new stage of development. The quality of traction power supply, as the guarantee for the efficient and safe operation of electrified high-speed railways, has become a research hotspot in academic and engineering circles. [0003] At present, the method widely used in the field of traction power supply quality analysis is to establish a chain network for a power suppl...

AI Technical Summary

Problems solved by technology

This method has the following disadvantages: (1) Different power supply arms of the traction network are not completely electrically insulated, and there is mutual influence; (2) The injection current of the electric locomotive is the engineering experience value of the speed at the rated voltage, and does not take into account the traction network The influence of voltage on the current makes the injected current of the electric locomotive deviate greatly from the actual value; (3) The influence of the power system on the voltage amplitude and phase angle of the secondary side of the traction transformer is ignored, so that the analysis results are not completely correct

[0004] In the literature [2-5], the influence of the traction load on the harmonics and negative sequence of the power system public grid is analyzed, although the influence of the traction load on the power system is considered, and the traction load with a specific type of electric locomotive is established. Harmonic current source model and negative sequence model, but the establishment of harmonic current source model and negative sequence model needs to be based on a large amount of measured data or simulation results, and only considers the impact of traction load on the power system, while ignoring the power system and the negative sequence model. Interaction of traction loads

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