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A Railway Power System with Harmonic Suppression

A technology for power systems and railways, applied to harmonic reduction devices and AC networks to reduce harmonics/ripples, etc., can solve problems such as damage to power equipment, and achieve the effects of strong adaptability, low cost, and small footprint

Active Publication Date: 2018-01-12
HEBEI XUHUI ELECTRIC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The technical problem to be solved by the present invention is to provide a railway power system that suppresses harmonics, solve the problem that the harmonics of the upper power supply cause damage to the power equipment in the power distribution station in the railway power system, and ensure that various operating modes of the power distribution station , When the skylight is "opened" at any position of the through line, the railway power system can operate stably

Method used

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  • A Railway Power System with Harmonic Suppression
  • A Railway Power System with Harmonic Suppression
  • A Railway Power System with Harmonic Suppression

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0016] Embodiment 1: as figure 1 As shown, a railway power system for suppressing harmonics includes a superior power supply 1, a power supply cabinet 3 of a power distribution station, and a through line 4 connected to the power cabinet 3 of the power distribution station, wherein the power cabinet 3 of the power distribution station is provided with a distribution The voltage regulator T, such as figure 2 As shown; the voltage regulator T of the power distribution station is equivalent to an equivalent inductance LT in the circuit, and the through line 4 is equivalent to a ground capacitance C in the circuit, as Figure 4 As shown; a harmonic suppression device 2 is installed between the superior power supply 1 and the power distribution cabinet 3 of the power distribution station. The circuit structure of the harmonic suppression device 2 is as follows figure 2 As shown, the harmonic suppression device 2 includes a reactor L, a resistor R, a circuit breaker QF, an isolat...

Embodiment 2

[0019] Example 2: The common capacity of the voltage regulator is 500kVA, the impedance is 6%, then LT=39mH, when C=10.3uF, n=1 / ω1 / (LT*C) 0.5 =5.02, the resonance point is near the 5th order. Compared with the railway power system, the voltage regulating cabinet 3 and the through line 4 of the power distribution station are equivalent to a 5th order filter branch. At this time, the impedance of the entire circuit of the railway power system is about The resistive component of the voltage regulator T, according to relevant standards, Z R =P K / I E 2 =6700 / 29 2 / 3=2.65Ω, the impedance is very small, which will cause a large amount of harmonic current of the upper power supply 1 to be shunted to the power cabinet 3 of the power distribution station, which will have a great impact on the power equipment of the power distribution station, and even cause equipment failure. After setting the parameters of the harmonic suppression device 2 to: L=50mH, R=80Ω, because of the adjust...

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Abstract

The invention discloses a railway power system for suppressing harmonics, belonging to the technical field of railway power, comprising a superior power supply, a power supply cabinet of a power distribution station, a through line connected with the power supply cabinet of the power distribution station, and an arrangement between the superior power supply and the power distribution station There is a harmonic suppression device, which includes reactor L, resistor R, circuit breaker QF, isolating switch QS1, isolating switch QS2 and isolating switch QS3, wherein the reactor L and resistor R are connected in parallel; the upper power supply and circuit breaker QF is connected, the circuit breaker QF is connected to the connection point of one end of the parallel connection of the reactor L and the resistor R, the other connection point of the parallel connection of the reactor L and the resistor R is connected to the lower interface B end, and the lower interface B end of the harmonic suppression device Connected to the power cabinet of the power distribution station. The invention avoids the damage caused by the harmonics of the superior power supply to the power equipment of the power distribution station in the railway power system, and ensures that the power system can operate stably in various operating modes of the power distribution station and various conditions of the through-line.

Description

technical field [0001] The invention relates to a railway power system, in particular to a railway power system capable of suppressing harmonics of a superior power supply, and belongs to the technical field of railway power. Background technique [0002] The upper-level power supply is transmitted to power lines such as through-lines through power distribution stations. With the improvement of railway operation reliability requirements, the through-line cables of railway power systems have become an inevitable trend. Most new lines use pure cables, and existing overhead lines are also constantly Accelerate the transformation of cables, which will cause a sharp increase in the capacitive current of the through-line, and the load capacity carried by the through-line is very small, and the overall performance is capacitive to the outside, which becomes a low-impedance path for the upper-level power supply harmonics, often causing power distribution substations Power equipment ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/01
CPCH02J3/01Y02E40/40
Inventor 李瑞桂张加玉张旭辉薛娟张恒
Owner HEBEI XUHUI ELECTRIC
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