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Method for balancing single-phase load of electrified railway by SVG

A technology for electrified railways and single-phase loads, applied in the direction of AC network voltage adjustment, multi-phase network asymmetry reduction, multi-phase network elimination/reduction of asymmetry, etc., to reduce pollution, compensate harmonic currents, and increase voltage levels Effect

Inactive Publication Date: 2010-01-20
RONGXIN POWER ELECTRONICS
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Problems solved by technology

This method can significantly improve the power quality of the electrified railway, increase the power factor, reduce power loss, and at the same time solve the power quality problems caused by the traction load of the electrified railway to the power grid, such as negative sequence, harmonics, and voltage fluctuations, and effectively ensure the safe and economical operation of the power grid. , to achieve the purpose of energy saving and efficiency

Method used

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  • Method for balancing single-phase load of electrified railway by SVG
  • Method for balancing single-phase load of electrified railway by SVG
  • Method for balancing single-phase load of electrified railway by SVG

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Embodiment Construction

[0029] The technical contents of the present invention will be described in detail below in conjunction with the accompanying drawings.

[0030] See figure 1 , a method of using SVG to balance single-phase loads of electrified railways. This method uses two sets of static var generators SVG1 and SVG2 with the same structure, which are respectively connected to transformers T1 and T2, and then respectively connected to the left and right bridge arms of the low-voltage side Above, the DC sides of the static var generators SVG1 and SVG2 are connected in parallel through a capacitor C to form a whole. The static var generators SVG1 and SVG2 are also respectively connected to solid filters FC1 and FC2 provided on the left and right bridge arms. According to specific circumstances, the structure of the present invention may not be provided with solid-state filters FC1 and FC2.

[0031] See figure 2 , the static var generator SVG1 or SVG2 adopts two-level power units in parallel ...

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Abstract

The invention relates to a method for balancing single-phase load of electrified railways and improving power quality of electrified railways. The method adopts two sets of static var generators SVG 1 and SVG 2 which have identical structures and are respectively connected with a left bridge arm and a right bridge arm on a low-voltage side; moreover, capacitors on the direct current sides of the SVG 1 and the SVG 2 are connected in parallel to form a whole. Compared with the prior art, the method has the following advantages: (1) compensating negative sequence current to reduce power grid pollution caused by negative sequence current; (2) reducing bus voltage loss to improve power grid voltage level; (3) compensating reactive power to improve power factor; and (4) compensating harmonic current to reduce power grid pollution caused by harmonic current.

Description

technical field [0001] The invention relates to a method for balancing the single-phase load of the electrified railway for improving the power quality of the electrified railway. Background technique [0002] Electrified railway is currently the key development mode of transportation in my country. It can increase railway transportation capacity and improve railway operation. Electrification has shown incomparable advantages in railway transportation. The "Medium and Long-Term Railway Network Plan" approved by the State Council clearly states that by 2020, the total mileage of my country's railways will reach 100,000km, of which 50,000km will be electrified railways, the electrification rate of railways will be about 50%, and the proportion of transport volume undertaken will be more than 80%. [0003] The rapid development of railway electrification expands transportation capacity and promotes economic development, but also exposes some problems and disadvantages, especial...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26H02J3/18H02J3/16H02J3/01
CPCY02E40/50
Inventor 李旷郭自勇李兴左强付国良孙蕾董力军韩国军
Owner RONGXIN POWER ELECTRONICS
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