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Electric locomotive non-power-off neutral section passing-electric energy quality comprehensive compensation device and method

A technology for electric locomotives and power quality, applied in reactive power compensation, reactive power adjustment/elimination/compensation, harmonic reduction devices, etc. Operation, high-speed train speed and other issues are greatly affected, to achieve the effect of reducing difficulty and cost, no loss of traction, and reducing the impact of negative sequence

Active Publication Date: 2011-04-27
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the command current of the locomotive can be limited to zero, and the rate of rise of the current can be controlled after passing through the electrical split phase to avoid inrush current, but the delay of restarting the locomotive will be more than 6s, which has a great impact on the speed of the high-speed train
The problem of electric phase separation and automatic over-phase separation has been seriously restricting the safe and reliable operation of high-speed and heavy-duty trains. So far, there is no cure for the disease, and it is imperative to find a new solution
Moreover, these methods inevitably cause the locomotive to have a "power-off-re-power" process, and a series of transitional processes resulting from this will form a transient hazard, which seriously restricts the high-speed and reliable operation of the electric railway.

Method used

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  • Electric locomotive non-power-off neutral section passing-electric energy quality comprehensive compensation device and method
  • Electric locomotive non-power-off neutral section passing-electric energy quality comprehensive compensation device and method
  • Electric locomotive non-power-off neutral section passing-electric energy quality comprehensive compensation device and method

Examples

Experimental program
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Effect test

Embodiment 1

[0111] In Example 1, the converter group V a and V b The design rated power capacity is 10Mvar, and the 2-level H-bridge voltage source converter V composed of 3300V / 1400AIGBT is used. r , the average value of the DC side voltage can be about 2000V, the rated capacity of each H-bridge voltage source converter is 0.83Mvar, n=12. like Image 6 As shown, the two sides of the converter group V a and V b Each has 12 sets of capacitors, which are respectively connected through a common DC side to form 12 sets of mutually independent "back-to-back" converters. The series multiple transformer group T b Each series multiple transformer group consists of a total of 3 T r Composition, each multi-winding transformer T r The split connection method with 4 windings on the secondary side is selected, the voltage transformation ratio of the primary side / secondary side is 7.6:1 (9.2kV / 1.2kV), and each T r The rated power capacity of the transformer is selected as 3.3Mvar. The embodime...

Embodiment 2

[0115] In Example 2, the converter group V a and V b The design rated power capacity is 14.2Mvar, and the 2-level H-bridge voltage source converter V composed of 3300V / 1000AIGBT is adopted. r , the average value of the DC side voltage can be about 2000V, the rated capacity of each H-bridge voltage source converter is 0.60Mvar, n=25. like Figure 7 As shown, the two sides of the converter group V a and V b Each has 25 sets of capacitors, which are respectively connected through a common DC side to form 25 sets of mutually independent "back-to-back" converters. Converter group V b The lead terminals z and w are directly connected to the traction power supply arm 15 . The embodiment selects the controllable switching switch 2 with a withstand voltage rating higher than 30kV, a rated current higher than 800A, and no on-load breaking capacity is required.

[0116] In Example 2, the power supply arm voltage V on both sides of the neutral section of the split phase α with V ...

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Abstract

The invention relates to an electric locomotive non-power-off neutral section passing-electric energy quality comprehensive compensation device and method, which belongs to the technical field of railway transport equipment and electric electronics. The device comprises a controllable transfer switch, a single-phase step down transformer, a single-phase step down transformer with a middle tap, a two-phase back-to-back converter sharing a DC-side capacitor, a circuit breaker switch, four position sensors and three electric quantity sensors. In the method, when the electric locomotive passes the neutral section, the controllable transfer switch is turned off, and the device works in a non-power-off neutral section passing mode to perform control on amplitude and phase of the neutral section voltage and enable the electric locomotive to pass the neutral section with load in a non-power-off manner. Without locomotive passing, the controllable transfer switch is closed, and the device works in an electric energy quality comprehensive compensation mode and has functions of active power transfer as well as inactive power and harmonic compensation. Through the device, the problems relating to electric energy quality of a traction substation and neutral section can be comprehensively solved based on the traditional traction power supply mode.

Description

technical field [0001] The invention belongs to the technical fields of railway transportation equipment and power electronics, and in particular relates to a device capable of realizing the automatic phase separation of an electric locomotive with load without power interruption and realizing the comprehensive compensation of power quality in a traction substation. Background technique [0002] The development of high-speed, heavy-duty, and high-density electrified railways has doubled the traction load. The single machine (column) power of passenger dedicated lines has reached 23,000kW, and the installed capacity of main transformers in traction substations has reached more than 75MVA or even 120MVA in the long run. On the one hand, the electrified railway traction power supply system has the characteristics of three-phase distribution asymmetry, impact and nonlinearity for the external power system. Power quality problems including harmonics and other tidal currents are b...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/26H02J3/18H02J3/01
CPCY02E40/30Y02E40/50Y02E40/40
Inventor 魏应冬姜齐荣洪芦诚
Owner TSINGHUA UNIV
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