CN205905821U - High -speed railway two phase three wire system modularization multi -level converter cophase power supply system - Google Patents
High -speed railway two phase three wire system modularization multi -level converter cophase power supply system Download PDFInfo
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- CN205905821U CN205905821U CN201620806483.9U CN201620806483U CN205905821U CN 205905821 U CN205905821 U CN 205905821U CN 201620806483 U CN201620806483 U CN 201620806483U CN 205905821 U CN205905821 U CN 205905821U
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- speed railway
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Abstract
The utility model discloses a high -speed railway two phase three wire system modularization multi -level converter cophase power supply system, is three -phase grid voltage through the three -phase the symmetry transformation of diphase equilibrium transformer becomes alpha, the double -phase voltage of beta, and wherein alpha is direct supplies power to pulling the net, and the three wire system converter adopts single star topology structure, and an one of which port connects the beta looks, and another port connects the alpha looks, and a third port connects alpha, the double -phase common port of beta. With the tradition back -to -back the converter structure compare and has reduced a set of switch tube bridge arm and two sets of step -down isolation transformer, this system can direct access high -pressure system to realized reducing the converter installation cost simultaneously in the quantity that reduces the switch tube.
Description
Technical field
This utility model belongs to high-speed railway traffic transport industry, and more particularly, to one kind is based on two-phase three wire system modularity
The high-speed railway cophase supply system of Multilevel Inverters and control method.
Background technology
In electric railway, a kind of selection mode ideal to high-speed railway traction substation is using high-power
AC-DC-AC converter is carried out cophase supply scheme and is replaced existing phase changing type power supply plan, and the program solves the problems, such as electric split-phase,
Meanwhile, solve the long-standing power quality problem of electric railway.Wherein, the homophase being constituted due to balance traction transformer
Power supply mode has the advantages that converter structure is simple, desired volume is relatively small, has also carried out correlation engineering both at home and abroad at present
The experimental study of test.
It is to be realized using the current transformer of back to back structure based on traditional cophase supply system that balance traction transformer is constituted
Cophase supply, needs the single-phase converter of two groups of back to back structure to constitute four switching tube branch roads to realize.Wherein, with regard to how
The research reducing converter device cost mainly has two kinds of thinkings: one is that symmetrical compensation principle is expanded to active cophase supply system
In system, the optimization of Converter Capacity is put into thus reducing capacity；Another kind be apply newly topology reducing the quantity of switching tube.
Utility model content
In order to newly topology application on the premise of with reduce switching tube quantity method under reduce converter device cost,
The utility model proposes a kind of cophase supply system based on two-phase three wire system Modularized current transformer, this system is directly accessed height
Pressure system, is belonged to two-phase voltage system compared with three-phase collocation structure, simplifies structure, thus for reducing converter device cost
The technology that provides ensures.
Its specific means is: a kind of high-speed railway two-phase three wire system modular multi-level converter cophase supply system,
Three-phase power grid voltage becomes α, β two-phase voltage through three-phase-biphase equilibrium transformator symmetry transformation, and wherein α directly supplies to Traction networks
Electricity, three-wire system current transformer connects β phase using single stelliform connection topology configuration, its a port, and another port connects α phase, the 3rd port
Connect the biphase common port of α, β.
Using this utility model high-speed railway two-phase three wire system modular multi-level converter cophase supply system, decrease
Two groups of high-voltage large-capacity step-down isolation transformers and a switch arm branch road, simplify to conventional three-phase compensation system structure,
Decrease switching tube branch road quantity and cancel two groups of step-down transformers, provide technology to ensure for reducing converter device cost.
The structure of the cophase supply system being constituted using two-phase three wire system current transformer, with traditional back-to-back converter structure phase
Ratio decreases one group of switching tube brachium pontis and two groups of step-down isolation transformers, and this system can be directly accessed high-pressure system, thus real
Show the quantity reducing switching tube and reduce converter device cost simultaneously.
Brief description
Fig. 1 is the homo-phase traction power supply system of the back-to-back two groups of current transformers of traditional single phase.
Fig. 2 is the homo-phase traction power supply system of two-phase three wire system current transformer.
Fig. 3 is negative phase-sequence harmonic current detecting block diagram.
Specific embodiment
Below in conjunction with the accompanying drawings apparatus and method of the present utility model are described in further detail.
Fig. 1 is the homo-phase traction power supply system of traditional single phase back-to-back converter, and Fig. 2 is based on two-phase three wire system modularity
The cophase supply system construction drawing of Multilevel Inverters.As shown in figure 1, three-phase power grid voltage is through three-phase-biphase equilibrium transformation
Device symmetry transformation becomes α, β two-phase voltage, and wherein α directly powers to Traction networks, and β is through single-phase back-to-back converter (pfc) and two
Group step-down transformer (t) is to the certain power of Traction networks transmission.Intermediate DC link is connected to jumbo high-voltage capacitor group.
This utility model embodiment is as shown in Fig. 2 three-phase power grid voltage is through three-phase-biphase equilibrium transformator symmetry transformation
After becoming α, β two-phase voltage, wherein α directly directly powers to Traction networks, and three-wire system current transformer a port connects β phase, another
Port connects α phase, and the 3rd port meets the biphase common port n of α, β, using single stelliform connection topology configuration, this level every sub by n
Module composition.
To the Detection ＆ Controling method of negative-sequence current harmonic instruction current referring to Fig. 3, by by the three-phase electricity detecting
Stream changes into real component and idle component through coordinate transform, does corresponding inverse transformation again, that is, after low-pass filtered device (lpf)
Can get harmonic wave and negative-sequence current.
In Fig. 3, lpf is low pass filter；Pll is phaselocked loop.For single-phase circuit, using ip-iqDetection method, through low pass
Real component i will be exchanged after wave filter (lpf)pWith exchange idle component iqFilter, directly obtain that direct current is active and idle component,
After doing corresponding inverse transformation again, obtain fundamental current.Again from electric current il(t)In deduct fundamental current, you can detect harmonic wave and negative phase-sequence
Electric current.
Of the present utility model organization plan, electric current detecting method, ultimate principle and this practicality have been shown and described above
New advantage, it should be understood by those skilled in the art that, this utility model is not restricted to the described embodiments, above-described embodiment
Simply organization plan of the present utility model, control method and the ultimate principle describing with description, without departing from this utility model
On the premise of spirit and scope, this utility model also has various changes and modifications, and these changes and improvements both fall within requirement and protect
In the range of this utility model of shield, this utility model claims scope and by appended claims and its equivalent defines.
Claims (2)
1. a kind of high-speed railway two-phase three wire system modular multi-level converter cophase supply system is it is characterised in that current transformer
Three groups of switch brachium pontis constitute two-phase three wire system, and three-phase power grid voltage becomes α, β two through three-phase-biphase equilibrium transformator symmetry transformation
Phase voltage, wherein α are directly powered to Traction networks, and three-wire system current transformer connects β phase using single stelliform connection topology configuration, its a port,
Another port connects α phase, and the 3rd port connects the biphase common port of α, β.
2. high-speed railway two-phase three wire system modular multi-level converter cophase supply system according to claim 1, its
It is characterised by, current transformer adopts modular multilevel structure, each brachium pontis is made up of n submodule.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620806483.9U CN205905821U (en) | 2016-07-28 | 2016-07-28 | High -speed railway two phase three wire system modularization multi -level converter cophase power supply system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201620806483.9U CN205905821U (en) | 2016-07-28 | 2016-07-28 | High -speed railway two phase three wire system modularization multi -level converter cophase power supply system |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN205905821U true CN205905821U (en) | 2017-01-25 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201620806483.9U Withdrawn - After Issue CN205905821U (en) | 2016-07-28 | 2016-07-28 | High -speed railway two phase three wire system modularization multi -level converter cophase power supply system |
Country Status (1)
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| CN (1) | CN205905821U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106114293A (en) * | 2016-07-28 | 2016-11-16 | 西华大学 | High-speed railway two-phase three wire system modular multi-level converter cophase supply system |
| CN111446866A (en) * | 2019-12-30 | 2020-07-24 | 中铁电气化局集团有限公司 | Through same-phase traction power supply system based on balancing transformer and four-port MMC |
-
2016
- 2016-07-28 CN CN201620806483.9U patent/CN205905821U/en not_active Withdrawn - After Issue
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106114293A (en) * | 2016-07-28 | 2016-11-16 | 西华大学 | High-speed railway two-phase three wire system modular multi-level converter cophase supply system |
| CN111446866A (en) * | 2019-12-30 | 2020-07-24 | 中铁电气化局集团有限公司 | Through same-phase traction power supply system based on balancing transformer and four-port MMC |
| CN111446866B (en) * | 2019-12-30 | 2021-05-28 | 中铁电气化局集团有限公司 | Through same-phase traction power supply system based on balancing transformer and four-port MMC |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20170125 Effective date of abandoning: 20200221 |
|
| AV01 | Patent right actively abandoned |