Railway power supply system comprehensive electric energy quality treatment device and method thereof

A technology of power supply system and power quality, applied in flexible AC transmission system, harmonic reduction device, AC network to reduce harmonic/ripple, etc., can solve the problem of high cost thyristor switching reactor, low cost, non-continuous compensation And other issues

Active Publication Date: 2013-01-16
ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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Problems solved by technology

[0008] The purpose of the present invention is to provide a comprehensive power quality control device and method for a subway power supply system, which overcomes the high cost of using a static var generator (SVG, Static Var Generator) alone and the thyristor switched reactor (TSR, Thyristor switch

Method used

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  • Railway power supply system comprehensive electric energy quality treatment device and method thereof
  • Railway power supply system comprehensive electric energy quality treatment device and method thereof
  • Railway power supply system comprehensive electric energy quality treatment device and method thereof

Examples

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Example Embodiment

[0063] A specific implementation of a comprehensive power quality management method for a subway power supply system includes the following steps:

[0064] The control and protection system 4 collects the current of the load 5 and the grid voltage; firstly, according to the current and the grid voltage of the load 5, calculate the reactive capacity of the load 5 that needs to be compensated, and then send different switching commands to the electronic switch 2 to control the thyristor switching The two or more reactor branches of the cut reactor are switched on and off to compensate for the large-capacity reactive power of the grid;

[0065] The control and protection system 4 collects the output current of the power unit 1 of the static reactive power generator, and obtains a three-phase PWM modulation signal after calculation, which is compared with the phase-shifted triangular carrier to obtain the PWM signal that drives the power unit 1 of the static reactive power generator to ...

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Abstract

The invention discloses a railway power supply system comprehensive electric energy quality treatment device and method thereof. A static var generator comprises a power unit and an electric reactor and is connected with a pre-charge loop; the power unit is connected in series with the electric reactor; and the pre-charge loop is connected with a power side of a power grid through an AC (alternating current) switch. A thyristor switch electric reactor comprises more than two electric reactor branches; each electric reactor branch comprises an electric reactor and an electronic switch; the electric reactor is connected in series with the electronic switch; and the electric reactor branch is connected in parallel on a load side of the power grid through the electronic switch. A control protection system controls the investment of the electric reactor branches to compensate for the reactive power and controls the static var generator to compensate for the reactive power. The device and method disclosed by the invention overcome the technical shortcomings that the cost is high by using a static var generator only and the thyristor switch electric reactor can not realize continuous compensation, and also consider the advantages of high regulation speed, wide operation range, reactive power compensation and harmonic wave treatment of the static var generator and large capacity and low cost of thyristor switch electric reactor.

Description

technical field [0001] The invention relates to the field of power electronics, in particular to a power quality control device and method for comprehensively compensating reactive power and filtering harmonics, which are applied in a subway power supply system. Background technique [0002] With the rapid development of my country's urban scale and emergency construction, the urbanization process is gradually accelerating, personnel travel and material exchanges are frequent, traffic demand is increasing sharply, and the contradiction between urban traffic supply and demand is becoming increasingly tense. growing demand for transportation. As one of the most economical and efficient urban transport tools in the world, the subway has developed rapidly in large and medium-sized cities in my country. At present, 33 cities across the country have proposed plans to build urban subways, and 28 of them have already started construction. [0003] my country's subway mainly adopts ...

Claims

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Application Information

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IPC IPC(8): H02J3/18H02J3/01
CPCY02E40/12Y02E40/10Y02E40/40
Inventor 黄燕艳周方圆龙礼兰邱文俊王才孝涂绍平沈辉文韬吴明水吴选保石二磊邓建华胡前蔡蔚张典林丽王群山李幼保周靖
Owner ZHUZHOU NAT ENG RES CENT OF CONVERTERS
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