Combined compensation system of injection-type hybrid active power filter and static var compensator

A technology of static var compensation and source filter, which is applied in active power filtering, reactive power adjustment/elimination/compensation, flexible AC transmission system, etc., to achieve the effect of reducing capacity, reducing cost and improving filtering effect

Inactive Publication Date: 2010-01-27
HUNAN UNIV
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  • Application Information

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Problems solved by technology

But because it is also a harmonic source, it brings harmonics to the power supply system

Method used

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  • Combined compensation system of injection-type hybrid active power filter and static var compensator
  • Combined compensation system of injection-type hybrid active power filter and static var compensator
  • Combined compensation system of injection-type hybrid active power filter and static var compensator

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Embodiment Construction

[0014] Such as figure 1 Shown is the connection diagram of the joint compensation system in the electrified traction system. Considering the structural characteristics of the electrified railway traction system and the operating conditions of locomotives, in order to achieve the purpose of optimizing and comprehensively controlling reactive power, negative sequence and harmonics, a joint compensation system is installed on both power supply bridge arms of the traction system.

[0015] see figure 2 , the joint compensation system of the present invention is composed of an injection hybrid active power filter and a static var compensator (SVC), which are all connected to the power supply 1 of the traction power supply system. The injection hybrid active power filter is composed of a separate injection active power filter 4 and a high-pass filter 2 . Separate injection active power filter includes three-phase uncontrolled rectifier bridge, inverter, output filter reactor L o ...

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Abstract

The invention discloses a combined compensation system of an injection-type hybrid active power filter and a static var compensator. The combined compensation system is composed of the injection-type hybrid active power filter and the static var compensator, wherein, the injection-type hybrid active power filter is composed of an uncontrollable rectifier bridge, an inverter, an output filter reactor, a coupling transformer, an injection branch and a high-pass filter, a first capacitor (C1) and a first inductor (L1) in the injection branch form a first harmonic resonance circuit, and forms a triple resonance injection branch with an injection capacitor (C[F]), and a second capacitor (C[G]), a second inductor (L[G]) and a resistor (R[G]) form a second order damped high-pass filter; the static var compensator is a thyristor controlled reactor; and an output terminal of the injection capacitor (C[F]) is connected with the high-pass filter, the static var compensator and electric grids. In the combined compensation system, one compensation system is respectively arranged at two feeding sections of an electric traction system, which can realize comprehensive control on reactive, harmonics and negative sequence compensation in electric railways.

Description

technical field [0001] The invention relates to a power supply compensation system, in particular to a joint compensation system of an injection hybrid active filter and a static var compensator. Background technique [0002] The load of the electrified railway power supply system is an electric locomotive. At present, most electrified railways use AC-DC-AC electric locomotives. Due to the high power of the locomotives, the frequent changes in speed and load conditions make the electric traction load fluctuation range It is very large, so the electric traction load is a very large harmonic source. The harmonic current distortion rate on the power supply arm is 25%-30%, and the power of each locomotive is very large. Take the SS4 locomotive as an example, the power reaches 6400kW . Two or even three locomotives are often operated on the same power supply arm, and the harmonic current amplitude is very large, which injects a large amount of harmonic current into the power sys...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01H02J3/18
CPCY02E40/40Y02E40/22Y02E40/12Y02E40/20
Inventor 罗安马伏军吴传平徐先勇方璐杨晓王文孙娟
Owner HUNAN UNIV
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