Electrified railway electric energy quality compensating device

Abstract

The invention relates to an electrified railway electric energy quality compensating device which comprises an alpha-phase converter bridge arm, wherein the alpha-phase converter bridge arm is connected with the alpha-phase power supply arm of a traction transformer through a reactor (LA); one end of the alpha-phase converter bridge arm is connected with one end of a capacitor through a direct current positive bus, and the other end is connected with one end of the other capacitor through a direct current negative bus; the midpoint of the serial connection part of the other ends of the two capacitors is used as a neutral point; the neutral point is connected with a traction power supply neutral line through a reactor (LO); the direct current positive bus and the direct current negative bus are simultaneously connected with a beta-phase converter bridge arm, and the beta-phase converter bridge arm is connected with the beta-phase power supply arm of the traction transformer through a reactor (LB); and a single-phase circuit comprising the traction power supply neutral line and the alpha-phase or beta-phase converter bridge arm is connected with the single-phase circuit comprising the traction power supply neutral line and the alpha-phase or beta-phase power supply arm, the current flowing through the reactor (LA) or (LB) is regulated and controlled by regulating the amplitude and the phase position of the output voltage of the alpha-phase or beta-phase converter bridge arm, and dynamic power compensation and harmonic filtering are carried out for the alpha-phase or beta-phase power supply arm. The invention is mainly used for improving the electric energy quality of an electrified railway power supply network and also can be used for similar single-phase power supply networks.

Description

technical field [0001] The invention relates to a power quality compensation device for an electrified railway. Background technique [0002] Electrified railways (hereinafter referred to as "electric railways") are high-power single-phase loads, which easily cause unbalanced three-phase voltages on the high-voltage side of traction transformers. Moreover, the scale of my country's electric railways is getting bigger and bigger, and the power of locomotives is getting higher and higher, causing imbalance problems to become more and more prominent. A large amount of negative sequence current is injected into the power grid, which often affects the safe operation of the power grid. In order to control the three-phase unbalance problem caused by the electric railway load, a reasonable compensation scheme must be considered. When using SVC (Static Var Compensator, Static Var Compensator) and STATCOM (Static Synchronous Compensator, Static Synchronous Compensator), in addition t...

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Problems solved by technology

Moreover, the transformer will increase the footprint of the compensation device and reduce its operating efficiency

However, in the development process of

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