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Single-phase electric energy quality controller for electrified railway power supply system

A technology for electrified railways and power supply systems, applied in the directions of reducing the asymmetry of polyphase networks, eliminating/reducing asymmetry in polyphase networks, reducing harmonics/ripples in AC networks, etc. Limit application and other issues to achieve the effect of improving power quality problems, reducing costs and operating losses, and reducing system losses

Active Publication Date: 2012-07-25
UNIVERSITY OF MACAU
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The disadvantage is that the high cost of the rectifier inverter limits the application of this solution

Method used

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  • Single-phase electric energy quality controller for electrified railway power supply system
  • Single-phase electric energy quality controller for electrified railway power supply system
  • Single-phase electric energy quality controller for electrified railway power supply system

Examples

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Effect test

example 1

[0032] Example 1: Hybrid UPQC in the same phase power supply system based on V, v transformer

[0033] In this embodiment, the Hybrid UPQC is installed in a traction substation using a V, v transformer to realize the same-phase power supply system. The detailed schematic diagram of the same-phase power supply system is as follows Figure 6 shown.

[0034] Assume that the public grid, that is, the three-phase voltage on the primary side of the traction transformer is as follows:

[0035]

[0036] In the above formula, V represents the effective value of the phase voltage of the three-phase power supply system connected to the traction substation.

[0037] Such as Figure 4 In the wiring, V, v transformer secondary side voltage is as follows:

[0038]

[0039] In the above formula, v α and v β Represent V, v the output voltage of the secondary side of the transformer, where v α Directly supply power to the traction network, v β is the no-load side in the non-inverti...

example 2

[0065] Example 2: Hybrid UPQC in the same-phase power supply system based on single-phase transformers

[0066] This example is basically the same as Example 1, except that the traction substation uses a single-phase transformer to supply power to the traction network, the load-side converter of the Hybrid UPQC is still connected to the traction network, and the no-load side converter is connected to the traction network through a step-up transformer. into the other two phases of the system, such as Figure 7 shown. Assuming that the traction substation is connected to the 110kV public grid, the DC voltage of the inverter is set to 28kV, the inductance and capacitance in the capacitive impedance resonate at the fifth harmonic, and the transformation ratio of the step-up transformer connected to the no-load side converter is Revised to 1:5.5.

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Abstract

The invention relates to a single-phase electric energy quality controller for an electrified railway power supply system, which is characterized by comprising a load side converter, a no-load side converter, a DC unit, a capacitive impedance and a booster transformer, wherein the load side converter and the no-load side converter exchange energy through the DC unit to form a back-to-back rectifier inverter; and the load side converter is connected with the capacitive impedance, and the no-load side converter is connected with the booster transformer. The controller provided by the invention has functions of active power control, reactive power compensation and harmonic compensation, and is capable of effectively improving electric energy quality in a traction power supply system of the electrified railway and reducing system loss.

Description

technical field [0001] The invention relates to a single-phase power quality controller used in an electrified railway power supply system, belonging to the technical field of power electronics in electrical engineering. Background technique [0002] China's electrified railways generally use single-phase power frequency alternating current to power railway locomotives. As a large-capacity single-phase load, the electric locomotive will inject negative sequence current into the three-phase power supply system, which will cause the problem of three-phase voltage imbalance and voltage fluctuation in the power supply system. The electric locomotive will generate reactive current and harmonic current at the same time, which will endanger the normal operation of the power system. [0003] In the existing electrified railway power supply system in our country, the scheme of phase sequence rotation and phase split power supply is generally adopted. This scheme can alleviate the i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/18H02J3/01H02J3/26
CPCY02E40/50Y02E40/30Y02E40/40
Inventor 黄民聪戴宁怡刘景荣黄志刚
Owner UNIVERSITY OF MACAU
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