Device used in electrified railway for controlling and compensating electric energy quality

Abstract

The invention discloses a device used in an electrified railway for controlling and compensating electric energy quality, and belongs to the field of power supply of electrified railways. The device comprises a passive filter formed by a second-order high-pass filter, a group of voltage source type converters, and a phase reactor, wherein the passive filter is used for providing an electric locomotive on an electrified railway with reactive power and filtering harmonic current generated by the electric locomotive; the voltage source type converters can generate voltage with controllable amplitude, phase and frequency and are used for negative sequence compensation, flicker control and the like of a traction power supply system of an electric railway; and the voltage source type converters are connected in parallel onto a 25kV traction electric network through the phase reactor and the passive filter. The device provided by the invention can solve the electric quality problems such as three phases imbalance, harmonic wave, voltage fluctuation, flicker and the like while compensating power factors of the power supply system of the electric railway. Additionally, with the fully play of the advantages of the passive filter, such as convenience for configuration and low cost, and the advantages of the voltage source type converter, such as small occupation area and low consumption as much as possible, the whole set of device can achieve the best technical specification and the greatest economic performance.

Description

technical field [0001] The invention relates to a power quality control and compensation device for electrified railways, in particular, it provides a reactive power compensation device for electrified railways; controls active power; The invention relates to a control device for comprehensive quality management, which belongs to the field of electrified railway power supply. Background technique [0002] The electric locomotive load in the electrified railway has the characteristics of nonlinearity, low power factor and three-phase imbalance, which not only seriously affects the power quality of the traction power supply system itself of the electrified railway, but also affects the power supply quality of the surrounding power users along the railway. Therefore, effective control measures must be taken for power quality problems such as negative sequence, harmonics, flicker and reactive power of electrified railways. [0003] The traditional method is to install a compens...

AI Technical Summary

Problems solved by technology

However, due to the randomness of the load of electrified railways, the compensation effect is not ideal, and the passive filter can only control the harmonics of a specific order, and has the disadvantage of easily resonating with the grid impedance to cause harmonic amplification

Active filters can dynamically suppress the harmonics of electrified railways, but cannot eliminate the negative sequence current in electrified railways

If SVC compensators such as TCR are used, the unbalance of the power supply system can be effectively improved and the negative sequence current can be reduced. However, TCR itself will generate a large number of harmonics during operation, and a large-capacity filter must be used to filter out the electric iron itself. harmonics and harmonics generated by TCR, the equipment occupies a large area and the corresponding investment is large

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