CN108599161B - Through traction power supply system - Google Patents
Through traction power supply system Download PDFInfo
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- CN108599161B CN108599161B CN201810635182.8A CN201810635182A CN108599161B CN 108599161 B CN108599161 B CN 108599161B CN 201810635182 A CN201810635182 A CN 201810635182A CN 108599161 B CN108599161 B CN 108599161B
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- 238000004804 winding Methods 0.000 claims abstract description 17
- 238000000034 method Methods 0.000 claims 1
- 239000003990 capacitor Substances 0.000 abstract description 5
- 238000010586 diagram Methods 0.000 description 2
- 238000005191 phase separation Methods 0.000 description 2
- 230000001172 regenerating effect Effects 0.000 description 2
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000005259 measurement Methods 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
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- H02J3/005—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/01—Arrangements for reducing harmonics or ripples
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/18—Arrangements for adjusting, eliminating or compensating reactive power in networks
- H02J3/1821—Arrangements for adjusting, eliminating or compensating reactive power in networks using shunt compensators
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/40—Arrangements for reducing harmonics
Abstract
The invention provides a through traction power supply system, and relates to the technical field of traction power supply. Main transformer substation CS M From secondary side as step-down transformer T having more than one winding 0 Is formed by connecting more than one group of super compensation systems SC in parallel, and a main transformer substation CS M As a voltage source, other substations provided with step-down transformers and three-phase-single-phase cascading converters N are used as system current sources, wherein: main transformer substation CS M Using a three-phase-single-phase traction transformer T M Three-phase input takes structure of single-phase output, step-down transformer T of supplying power 0 The primary side of the transformer is connected with a three-phase power grid, the secondary side is provided with more than one group of windings, and the three-phase outputs of the more than one group of windings are respectively connected with a reactor in series and then are connected with corresponding super compensators SC N Form the parallel super compensation system SC; the input end of the main controller MC is respectively connected with the three-phase network side current, the three-phase network voltage and the supporting capacitor voltage of the super compensator, and the output end of the main controller MC is connected with the control end of the super compensation system SC.
Description
Technical Field
The invention relates to the technical field of traction power supply.
Background
At present, a three-phase-two-phase power supply mode is widely adopted in an electrified railway, and a substation takes power from a three-phase power grid, outputs the power through two power supply arms after being reduced by a traction transformer, and supplies power for the traction grid. However, since the voltage phase, amplitude and frequency between the two power supply arms and the power substation are difficult to be completely consistent, the power supply arms and the power substations must be provided with electric phase separation. The presence of electrical phase separation severely constrains the speed and load capacity of the train. In addition, because of the existence of electric split phases, the capacity of the power substation cannot be complemented, so that a large-capacity transformer is needed for standby, and great waste is caused to society; when the train regeneratively brakes, the energy of the regeneratively braking can only be fed back to a substation under the current power supply arm, or the power is supplied to the train running in the section, a large amount of regeneratively braking energy is difficult to fully and effectively utilize, the voltage of the traction network in the power supply section is often raised, the normal operation of main equipment such as the train and the traction network is directly influenced, the safe and stable operation of the train and the traction power supply system is threatened, and a large amount of energy is wasted.
The traction load of the electrified railway is single-phase alternating current load, negative-sequence current is injected into a three-phase power grid through a traction substation, so that the three phases of a traction power supply system are seriously unbalanced, and meanwhile, the problems of reactive power, harmonic waves and the like exist. The negative sequence current can bring a series of hazards to electric equipment, such as energy loss generated by a transformer, additional heating is caused in a magnetic circuit of an iron core, and the service life of the transformer is reduced; energy losses are created in the transmission line, reducing the line transport capacity. The generation of reactive power can increase equipment capacity, also can cause the power grid voltage to severely fluctuate, and increase equipment and line losses. Harmonic current can cause harmonic resonance of a traction power supply system to threaten safety of electrical equipment, and can also influence measurement accuracy and normal communication of the instrument.
Therefore, how to solve the power quality problem of the traction power supply system and reduce or even cancel the electric phase splitting device is a hot spot problem of the current traction power supply system research. The through traction power supply system taking the converter as core equipment can completely cancel the electric split phase, realize the cross-region power supply, solve the problems of negative sequence, reactive power, harmonic wave and the like, and has adjustable system capacity configuration and variable system access voltage. However, if the existing capacity requirement of the railway traction substation is met, a large number of three-phase-single-phase converters are required to be cascaded, the system is difficult to control and low in reliability, the cost of the substation is greatly increased, and as the system mainly consists of the converters, the overload capacity of the system is weak, the instantaneous high voltage on the traction network is likely to cause the difficulty of normal operation of the traction power supply system, and the current requirement is difficult to adapt.
Disclosure of Invention
The invention aims to provide a through traction power supply system which can effectively solve the problem of power quality of a traction network in a full-line through state.
The invention aims to solve the technical problems by adopting the following technical scheme: a through traction power supply system comprises a traction transformer T M Main transformer station CS M And super compensation system SC of H bridge structure, traction transformer T M The primary side three phases are respectively connected with the A phase, the B phase and the C phase of the three-phase power grid, and the secondary side single phases a and B are respectively connected with the traction grid G and the rail R; main transformer substation CS M The transformer is composed of a step-down transformer T0 with more than one group of windings on the secondary side and more than one group of super compensation systems SC which are connected in parallel, and a main transformer station CS M As a voltage source, other voltage-reducing transformers T are arranged 1 ～T N And three-phase-single-phase cascading converter ADA 1 ～ADA N Is of the transformer substation CS 1 ～CS N As a system current source, wherein: main transformer substation CS M Using a three-phase-single-phase traction transformer T M Three-phase input takes structure of single-phase output, step-down transformer T of supplying power 0 The primary side of the transformer is connected with a three-phase power grid, the secondary side is provided with more than one group of windings, and the three-phase outputs of the more than one group of windings are respectively connected in series with the reactors La1 to La3, the reactors Lb1 to Lb3 and … and the reactors Ln1 to Ln3 respectively and then are connected with the corresponding super compensator SC1, the super compensator SC2, … and the super compensator SC N Form the parallel super compensation system SC; the input end of the main controller MC is respectively connected with three-phase network side currents Ia, ib and Ic and three-phase network voltages Ua, ub and Uc and super compensators SC1, SC2, … and SC N The support capacitor voltages Vdc1, vdc2, …, vdcn, and the output terminal of the main controller MC is connected to the control terminal of the super compensation system SC.
The through traction power supply system consists of a main transformer substation CS provided with a super compensation system SC M And other substation CS provided with a three-phase-single-phase cascade converter.
The three-phase-single-phase traction transformer is a pure single-phase traction transformer or other three-phase-two-phase traction transformers; when a three-phase-two-phase traction transformer is adopted, the secondary side only takes one phase for output, and the other phase is reserved.
The super compensator SC1, the super compensators SC2 and … and the super compensator SC N Both adopt a two-level H-bridge structure or adopt a multi-level H-bridge structure.
It should be noted that, according to actual needs, the three-phase-single-phase traction transformer may be a pure single-phase traction transformer, or may be various three-phase-two-phase traction transformers, such as Yd11 transformer, scott transformer, and V/V transformer. When a three-phase-two-phase traction transformer is adopted, the secondary side only takes one phase for output, and the other phase is reserved. Because the three-phase-single-phase traction transformer adopts a structure that three-phase input takes single-phase output, unbalanced reactive power and unbalanced harmonic waves of fixed open-phase are generated when the train runs, and a large amount of active power is generated for the main transformer CS when the train is in traction working condition or regenerative braking working condition M And the three-phase network. To solve these problems, the main transformer station CS M Is provided with a super compensation system SC. The super compensation system SC consists of a multi-winding step-down transformer and a super compensator, a three-phase power grid (A, B, C) is stepped down by the multi-winding step-down transformer, each winding on the secondary side is connected in series with a respective reactor (La 1-La 3, lb 1-Lb 3, …, ln 1-Ln 3) to be connected out, and finally the super compensator SC1, SC2, …, SC are connected N A parallel super compensation system SC is formed. The through traction power supply system provided by the invention is composed of a main transformer substation CS M As a voltage source, other traction substations are used as current sources to ensure that the system capacity can be configured as required. The invention can realize the whole line penetration of the traction network, thoroughly solve the problem of electric energy quality, realize the friendly energy intercommunication among the train, the traction network, the traction substation and the three-phase power network, facilitate the access of new energy and facilitate the access of different three-phase power networks.
Compared with the prior art, the invention has the beneficial effects that:
1. the through traction power supply system provided by the invention can flexibly configure the capacity of the traction substation, does not need to cascade a large number of power electronic converters, reduces the control difficulty of the system, improves the reliability of the system and reduces the cost of the substation;
2. besides the main substation, other substations are composed of a multi-winding step-down transformer and a cascade converter, so that the phase, frequency and amplitude of the output voltage can be controlled, the grid-connected requirement is met, and full-line through is realized;
3. the main substation is provided with the super compensator, so that the electric energy quality problem can be thoroughly solved, the energy-friendly intercommunication among the train, the traction network, the traction substation and the three-phase power network can be realized, other power substations are composed of multi-winding step-down transformers and cascading converters, the access of new energy sources can be facilitated, and the access of different three-phase power networks can be facilitated.
Drawings
Fig. 1 is a through-type traction power supply system structure of the present invention.
FIG. 2 is a block diagram of a main transformer with super compensation system of the present invention.
Fig. 3 is a super compensator of the present invention based on a two-level H-bridge structure.
Fig. 4 is a super compensator based on a three-level H-bridge structure according to the present invention.
Fig. 5 is a super compensator based on a multi-level H-bridge structure according to the present invention.
Description of the embodiments
FIG. 1 is a block diagram of a through traction power supply system according to the present invention, with a three-phase network (A, B, C) passing through a three-phase-single-phase traction transformer T M And outputting 27.5kV traction network voltage, and matching with a super compensation system SC to solve the power quality problem. Others are provided with transformers T with step-down 1 ～T N And three-phase-single-phase cascading converter ADA 1 ～ADA N Is of the transformer substation CS 1 ～CS N As a system current source, the system capacity can be ensured to be configured as required, and a through traction power supply network is formed. Main transformer substation CS M Using a three-phase-single-phase traction transformer T M Power supply, traction transformer T M The primary side three phases are respectively connected with a three-phase power grid (A, B and C), the secondary side two phases (a and B) are respectively connected with a traction grid (G) and a rail (R), and 27.5kV traction grid voltage is output; in the figure, L1 and L2 are trains. It should be noted that, according to actual needs, the three-phase-single-phase traction transformer may be either a pure single-phase traction transformer or various three-phase-two-phase traction transformersA transformer such as a Yd11 transformer, scott transformer, V/V transformer, etc. When a three-phase-two-phase traction transformer is adopted, the secondary side only takes one phase for output, and the other phase is reserved. Because the three-phase-single-phase traction transformer adopts a structure that three-phase input takes single-phase output, unbalanced reactive power and unbalanced harmonic waves of fixed open-phase are generated when the train runs, and a large amount of active power is generated for the main transformer CS when the train is in traction working condition or regenerative braking working condition M And the three-phase network. To solve these problems, the super compensation system SC of the present invention is shown in fig. 2. The super compensation system SC consists of a multi-winding step-down transformer and a super compensator, a three-phase power grid (A, B, C) is stepped down by the multi-winding step-down transformer, each winding on the secondary side is connected with the other end by a reactor (La 1-La 3, lb 1-Lb 3, …, ln 1-Ln 3), and finally the super compensators SC1, SC2, …, SC are connected N A parallel super compensation system SC is formed. It should be noted that, according to actual needs, the super compensator may be a two-level structure or a multi-level structure, for example, a super compensator based on a two-level H-bridge structure shown in fig. 3, in which S11 to S32 in the drawings represent switching devices, a11 to a13 represent three-phase currents, and C1 represents a dc capacitor; the super compensator based on the three-level diode clamping H bridge structure is shown in the figure (4), wherein S11-S34 in the figure represent switching devices, D11-D21 represent diodes, and C1 and C2 represent direct current capacitors; and a super compensator based on an n-level diode clamped H bridge structure shown in fig. 5, wherein S11-S32 n represent switching devices, D11-D12 n-2 represent diodes, and C1 … Cn represents a direct current capacitor.
The through traction power supply system provided by the invention can flexibly configure the capacity of the traction substation, does not need to cascade a large number of power electronic converters, reduces the control difficulty of the system, improves the reliability of the system, reduces the cost of the substation, can realize the full line through of the traction network, can thoroughly solve the problem of electric energy quality, and realizes the friendly energy intercommunication among the train, the traction network, the traction substation and the three-phase power network.
Claims (2)
1. A through traction power supply system comprises a traction transformer T M Main transformerCS of the institute M And super compensation system SC of H bridge structure, traction transformer T M The primary side three phases are respectively connected with the A phase, the B phase and the C phase of the three-phase power grid, and the secondary side single phases a and B are respectively connected with the traction grid G and the rail R; the method is characterized in that: main transformer substation CS M From secondary side as step-down transformer T having more than one winding 0 Is formed by connecting more than one group of super compensation systems SC in parallel, and a main transformer substation CS M As a voltage source, other voltage-reducing transformers T are arranged 1 ～T N And three-phase-single-phase cascading converter ADA 1 ～ADA N Is of the transformer substation CS 1 ～CS N As a system current source, wherein: main transformer substation CS M Using a three-phase-single-phase traction transformer T M Three-phase input takes structure of single-phase output, step-down transformer T of supplying power 0 The primary side of the transformer is connected with a three-phase power grid, the secondary side is provided with more than one group of windings, and the three-phase outputs of the more than one group of windings are respectively connected in series with the reactors La1 to La3, the reactors Lb1 to Lb3 and … and the reactors Ln1 to Ln3 respectively and then are connected with the corresponding super compensator SC1, the super compensator SC2, … and the super compensator SC N Form the parallel super compensation system SC; the input end of the main controller MC is respectively connected with three-phase network side currents Ia, ib and Ic and three-phase network voltages Ua, ub and Uc and super compensators SC1, SC2, … and SC N The output end of the main controller MC is connected with the control end of the super compensation system SC; the through traction power supply system consists of a main transformer substation CS provided with a super compensation system SC M And other substation CS provided with three-phase-single-phase cascading converters; the three-phase-single-phase traction transformer is a pure single-phase traction transformer or other three-phase-two-phase traction transformers; when a three-phase-two-phase traction transformer is adopted, the secondary side only takes one phase for output, and the other phase is reserved.
2. The through-type traction power supply system according to claim 1, wherein the super compensator SC1, the super compensators SC2 and … and the super compensator SCn all adopt a two-level H-bridge structure or a multi-level H-bridge structure.
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| CN201810635182.8A CN108599161B (en) | 2018-06-20 | 2018-06-20 | Through traction power supply system |
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| CN201810635182.8A CN108599161B (en) | 2018-06-20 | 2018-06-20 | Through traction power supply system |
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| CN108599161B true CN108599161B (en) | 2023-09-01 |
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Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN109802401A (en) * | 2019-03-06 | 2019-05-24 | 中南大学 | A kind of through AT contact net for power supplying harmonic detecting and damping unit |
| CN113224762B (en) * | 2021-05-28 | 2022-05-10 | 西南交通大学 | Long-distance through flexible traction power supply system and optimization control method thereof |
| CN114421457B (en) * | 2021-12-21 | 2022-12-06 | 西南交通大学 | Through flexible traction substation based on high step-down ratio transformer |
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