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

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 ...

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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 switched Reactor) Technical defects that cannot be continuously compensated, while taking into account the advantages of fast adjustment speed of static var generator, wide operating range, compensation of reactive power and control of harmonics, large capacity of thyristor switching reactor, and low cost

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