CN113808834B - Three-phase traction and power hybrid transformer for alternating current electric rail transit engineering - Google Patents
Three-phase traction and power hybrid transformer for alternating current electric rail transit engineering Download PDFInfo
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- CN113808834B CN113808834B CN202111053293.6A CN202111053293A CN113808834B CN 113808834 B CN113808834 B CN 113808834B CN 202111053293 A CN202111053293 A CN 202111053293A CN 113808834 B CN113808834 B CN 113808834B
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/04—Fixed transformers not covered by group H01F19/00 having two or more secondary windings, each supplying a separate load, e.g. for radio set power supplies
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/29—Terminals; Tapping arrangements for signal inductances
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/28—Coils; Windings; Conductive connections
- H01F27/30—Fastening or clamping coils, windings, or parts thereof together; Fastening or mounting coils or windings on core, casing, or other support
- H01F27/306—Fastening or mounting coils or windings on core, casing or other support
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F27/00—Details of transformers or inductances, in general
- H01F27/34—Special means for preventing or reducing unwanted electric or magnetic effects, e.g. no-load losses, reactive currents, harmonics, oscillations, leakage fields
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F30/00—Fixed transformers not covered by group H01F19/00
- H01F30/06—Fixed transformers not covered by group H01F19/00 characterised by the structure
- H01F30/12—Two-phase, three-phase or polyphase transformers
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01F—MAGNETS; INDUCTANCES; TRANSFORMERS; SELECTION OF MATERIALS FOR THEIR MAGNETIC PROPERTIES
- H01F38/00—Adaptations of transformers or inductances for specific applications or functions
- H01F38/16—Cascade transformers, e.g. for use with extra high tension
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The three-phase traction and power hybrid transformer for the AC electric rail transit engineering greatly reduces the set number of the large-sized high-voltage transformers and the set number of related supporting facilities, saves engineering cost and later maintenance workload, simplifies control equipment and protection equipment, greatly saves space required by the equipment and related supporting facilities, and reduces engineering scale and investment. A triangular winding/single-phase winding/V-shaped winding is adopted to form a three-winding transformer, a traction and electric power sharing high-voltage side triangular winding is connected with a three-phase alternating current power supply input by an electric power system, a traction low-voltage side single-phase winding outputs a 27.5kV single-phase power supply, and the traction low-voltage side single-phase winding is connected with a traction network to provide a traction power supply for rolling stock; the power low-voltage side two-phase V-shaped winding outputs a two-phase 35kV/20kV/10kV power supply which is connected with a medium-voltage 35kV or 20kV or 10kV power supply network of rail transit to form the power supply capacity for power loads along the line; the traction low-voltage side single-phase winding and the electric low-voltage side two-phase V-shaped winding each independently meet different capacity requirements.
Description
Technical Field
The invention relates to rail transit engineering, in particular to a three-phase traction and power hybrid transformer for alternating current electric rail transit engineering.
Background
At present, the rail traffic engineering of part of cities adopts a single-phase alternating current 25kV power supply mode consistent with an electrified railway to supply power for rolling stock. A traction transformer is independently adopted in a substation, and an externally input three-phase 110kV or 220kV power supply is converted into a single-phase alternating-current 25kV film to provide traction power for rolling stock; meanwhile, the power transformers are independently arranged, and an externally input three-phase 110kV or 220kV power supply is converted into three-phase 35kV or 20kV or 10kV, so that the power supply is provided for power loads along the line.
The power supply system in the substation using the independent traction transformer and the power transformer is shown in fig. 4. In urban rail transit power supply systems, because the voltage level of the transformer stations is high, the occupied area is large, the requirements are also high, planning and site selection are difficult in the urban area range, the acquisition of external 110kV or 220kV power points is extremely difficult, and the cost is high, so that the power transformer and the traction transformer are integrated in the same transformer station under most conditions, share the same input power supply, but the traction and the power transformer with high voltage level are respectively and independently arranged, and the equipment quantity, the occupied area and the engineering cost are greatly improved.
Because the running speed of urban rail transit is relatively low, the running density is high, and the load is heavy. And because the single-phase alternating current 25kV is adopted as a traction power supply, the traction power supply corresponds to the electric phase separation problem at the traction network side, so that the implementation difficulty and the influence on the driving efficiency and other aspects are large, and the negative sequence problem brought to the power supply side of the power system becomes two main problems which puzzles the development of the power system at present. It has become a subject how to reduce the electric phase separation of the traction network as much as possible and meet the requirements of the three-phase unbalance standard of the electric power system.
Disclosure of Invention
The invention aims to solve the technical problem of providing a three-phase traction and power hybrid transformer for alternating current electric rail transit engineering, which is used for greatly reducing the number of the large-sized high-voltage transformers and the number of related supporting facilities, saving engineering cost and later maintenance workload, simplifying control equipment and protection equipment, greatly saving space required by the equipment and related supporting facilities, and reducing engineering scale and investment.
The technical scheme adopted by the invention for solving the technical problems is as follows:
the invention relates to a three-phase traction and power hybrid transformer for an alternating current electric rail transit project, which is characterized in that: a three-winding transformer is formed by adopting a triangular winding/a single-phase winding/a V-shaped winding, and the three-winding transformer is uniformly integrated in a transformer shell; the traction and electric power sharing high-voltage side triangular winding is connected with a three-phase alternating current power supply input by an electric power system, and the traction low-voltage side single-phase winding outputs 27.5kV single-phase power supply which is connected with a traction network to provide traction power supply for rolling stock; the power low-voltage side two-phase V-shaped winding outputs a two-phase 35kV/20kV/10kV power supply which is connected with a medium-voltage 35kV or 20kV or 10kV power supply network of rail transit to form the power supply capacity for power loads along the line; the traction low-voltage side single-phase winding and the electric low-voltage side two-phase V-shaped winding each independently meet different capacity requirements.
Or, adopting single-phase winding/single-phase winding and V-shaped winding/V-shaped winding wiring to form a four-winding transformer, and uniformly integrating the four-winding transformer into a transformer shell; the traction high-voltage side single-phase winding and the traction low-voltage side single-phase winding form a traction side winding; the power high-voltage side V-shaped winding and the power low-voltage side V-shaped winding form a power side winding; traction high-voltage side single-phase windings are connected with electric power high-voltage side V-shaped windings in an interphase mode through high-voltage side external wiring; the traction low-voltage side single-phase winding and the electric low-voltage side V-shaped winding each independently meet different capacity requirements.
The beneficial effects of the invention are mainly shown in the following aspects:
1. the three-phase traction and power hybrid transformer shares 110kV or 220kV inlet wire at the high voltage side, traction load directly outputs single-phase power supply, power load adopts V-shaped wiring to output power supply, traction and power winding adopts an isovolumetric or unequal-volumetric structure according to actual engineering conditions, head-end power split phase at the wire-surfing side of a traction substation can be reduced, and conditions are provided for the whole traction load to adopt in-phase power supply;
2. the high-side three-phase current of the three-phase traction and power hybrid transformer is generally balanced and does not generate zero sequence in any case;
3. the three-phase traction and power hybrid transformer can effectively reduce the negative sequence injection current of the single-phase traction load of the alternating current electric rail transit engineering to the power system through the mutual balance action of the traction load and the power load, and when the capacity ratio of the power/traction load is more than or equal to 60%, the negative sequence current injected into the power system is superior to that of the current widely adopted V/V wiring traction transformer;
4. the traction transformer and the power transformer in the substation are integrated into a whole, so that the setting number of the large-sized high-voltage transformers and the setting number of related supporting facilities are greatly reduced. On one hand, the utility model realizes the sharing of facilities and materials such as iron cores, shells, supports, insulators, radiators and the like to the greatest extent, and saves engineering cost and later maintenance workload; on the other hand, as the number of large-sized high-voltage transformers is reduced, the number of equipment such as high-voltage switches connected with the transformers is correspondingly reduced, meanwhile, the control and protection equipment is simplified, the space required by the equipment and related supporting facilities are greatly saved, the engineering scale and investment are reduced, and precious urban land resources can be saved.
Drawings
The specification includes the following 4 figures:
fig. 1 is a winding connection mode of a three-phase traction and power hybrid transformer for an ac electrified rail transit project according to the present invention, in which: a transformer housing 1, a high-voltage side delta winding 11, a traction low-voltage side single-phase winding 12, and an electric low-voltage side two-phase V-shaped winding 13;
fig. 2 is another winding connection mode of the three-phase traction and power hybrid transformer for the ac electric rail transit engineering according to the present invention, in which: a transformer case 1, a traction high-voltage side single-phase winding 21, a traction low-voltage side single-phase winding 22, an electric power high-voltage side V-shaped winding 31, an electric power low-voltage side V-shaped winding 32, a high-voltage side external connection 10;
fig. 3 is a voltage-current vector diagram of the high-low voltage side of the three-phase traction and power hybrid transformer for the ac electric rail transit engineering according to the present invention, in which: i Q For traction side current, I a 、I b For the power side load current, phi Q For traction load angle, φ is the electrical load angle.
Fig. 4 is a schematic diagram of a power scheme employing an independent traction transformer and a power transformer within a substation.
Detailed Description
The invention is further described below with reference to the accompanying drawings.
The invention integrates a conventional traction transformer and a power transformer which are independently arranged into a set of device, is used for traction and power supply of a power substation, realizes sharing of 110kV or 220kV high-voltage side power supply, and simultaneously outputs a single-phase 27.5kV traction power supply and a 35kV or 20kV or 10kV three-phase power supply which are respectively used as traction power supply and power supply of power loads along the line.
The three-phase traction and power hybrid transformer adopts two winding wiring forms shown in fig. 1 or 2.
Scheme one referring to fig. 1, the three-phase traction and power hybrid transformer for the alternating current electric rail transit engineering of the present invention adopts a delta winding/single phase winding/V winding (delta/I/V) to form a three-winding transformer, and is integrally formed in a transformer housing 1. The traction and electric power sharing high-voltage side triangular winding 11 is connected with a three-phase alternating current power supply input by an electric power system, and the traction low-voltage side single-phase winding 12 outputs a 27.5kV single-phase power supply which is connected with a traction network to provide traction power supply for rolling stock; the power low-voltage side two-phase V-shaped winding 13 outputs a two-phase 35kV/20kV/10kV power supply, and is connected with a medium-voltage 35kV or 20kV or 10kV power supply network of rail transit to form the power supply capacity for power loads along the line; the traction low-voltage side single-phase winding 12 and the electric low-voltage side two-phase V-winding 13 each independently meet different capacity requirements.
Scheme two referring to fig. 2, the three-phase traction and power hybrid transformer for the alternating current electric rail transit engineering of the present invention adopts single-phase winding/single-phase winding (I/I) and V-shaped winding/V-shaped winding (V/V) wiring to form a four-winding transformer, which is unified and integrated in the transformer housing 1. The traction high-voltage side single-phase winding 21 and the traction low-voltage side single-phase winding 22 form a traction side winding; the power high-voltage side V-winding 31 and the power low-voltage side V-winding 32 constitute a power side winding; traction high-voltage side single-phase winding 21 and electric power high-voltage side V-shaped winding 31 are connected alternately through high-voltage side external connection 10; traction low-side single-phase winding 22 and electric low-side V-winding 32 each independently meet different capacity requirements.
The technical scheme can be applied to national main lines and urban rail transit engineering of alternating current power supply system.
The principle of the three-phase traction and power hybrid transformer for the AC electrified rail transit engineering is shown in figures 1 and 2. Let the number of turns of the high-voltage side winding W Ⅰ The number of turns of the low-voltage side winding is W Ⅱ 、W Ⅲ ，k 1 ＝W Ⅰ /W Ⅱ ，k 2 ＝W Ⅰ /W Ⅲ According to the magnetic potential balance principle on each core column, the current mapping relation of the high voltage side and the low voltage side can be written as follows:
the voltage-current vectors of the high and low voltage sides of the three-phase traction and power hybrid transformer are shown in fig. 3 according to fig. 2, 3 and (1). As can be seen from fig. 3, the high-side three-phase voltages of the three-phase traction and power hybrid transformer are symmetrical, the high-side three-phase currents are generally balanced, and no zero sequence is generated in any case.
The invention relates to a negative sequence analysis of a three-phase traction and power hybrid transformer for an alternating current electric rail traffic engineering, which comprises the following steps:
from the formula (1), according to the symmetrical component method Then:
traction load angle phi Q When cos phi Q ≈1，k 1 ＝110/27.5，k 2 ＝110/35，I/I Q When=m:
three-phase current imbalance degree:
ε＝I 2 /I 1 (4)
then:
according to equation (5), the different values of the electric/traction load current asymmetry coefficient m are corresponding:
when m=0, epsilon=1, the single-phase traction transformer is adopted by the traction substation, and the negative sequence influence on the electric power system is equivalent to that of the single-phase traction transformer;
m=1, if cos Φ≡0.9, epsilon= 0.1651, the negative sequence effect on the power system is close to that of a balanced traction transformer;
when m=0.23, if cos phi is approximately equal to 0.9 and epsilon=0.5, the negative sequence effect on the power system corresponds to a V/V wiring traction transformer;
and K is again S ＝S D /S Q ＝(2U D *I)/(U D *I Q ) (6)
Wherein: k (K) S S is the ratio of the electric load capacity to the traction load capacity D For the power load capacity, S Q For traction load capacity, U D Is the power load phase voltage, I is the power load phase current, U Q To pull load phase voltage, I Q To draw load phase current.
When m=0.23, k S =0.6, i.e.: for the negative sequence characteristics of three-phase traction and power hybrid transformers, the power and traction load capacity ratio (K S ) The negative sequence characteristics of the corresponding three-phase traction and power hybrid transformers are equal to or better than those of the current widely used V/V traction transformers (when the loads of the two traction power supply arms are equal to or greater than those of the current widely used V/V traction transformers) when the power load capacity is equal to or greater than 60% of the traction load.
In summary, the invention can realize the integration of the traction transformer and the power transformer in the AC electric rail transit engineering substation, and realize the power supply of the traction load with the voltage class of 25kV and the power supply of the conventional power load with the voltage class of 35kV or 20kV or 10 kV. The method can greatly reduce the set number of the large-sized high-voltage transformers and the set number of related supporting facilities, save engineering cost and later maintenance workload, simplify control equipment and protection equipment, greatly save space required by the equipment and the related supporting facilities, and reduce engineering scale and investment.
Claims (2)
1. Three-phase traction and power hybrid transformer for alternating current electric rail transit engineering, characterized by: a three-winding transformer is formed by adopting a triangular winding/a single-phase winding/a V-shaped winding and is uniformly integrated in a transformer shell (1); the traction and electric power sharing high-voltage side triangular winding (11) is connected with a three-phase alternating current power supply input by an electric power system, the traction low-voltage side single-phase winding (12) outputs a 27.5kV single-phase power supply, and the traction low-voltage side single-phase winding is connected with a traction network to provide a traction power supply for rolling stock; the power low-voltage side two-phase V-shaped winding (13) outputs a two-phase 35kV/20kV/10kV power supply which is connected with a medium-voltage 35kV or 20kV or 10kV power supply network of rail transit to form the capacity of supplying power to power loads along the line; the traction low-voltage side single-phase winding (12) and the electric low-voltage side two-phase V-shaped winding (13) each independently meet different capacity requirements.
2. Three-phase traction and power hybrid transformer for alternating current electric rail transit engineering, characterized by: the four-winding transformer is formed by adopting single-phase windings/single-phase windings and V-shaped windings/V-shaped windings, and is uniformly integrated in a transformer shell (1); the traction high-voltage side single-phase winding (21) and the traction low-voltage side single-phase winding (22) form a traction side winding; the power high-voltage side V-shaped winding (31) and the power low-voltage side V-shaped winding (32) form a power side winding; traction high-voltage side single-phase winding (21) and electric power high-voltage side V-shaped winding (31) are connected alternately through high-voltage side external connection wires (10); the traction low-side single-phase winding (22) and the electric low-side V-winding (32) each independently meet different capacity requirements.
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| CN202111053293.6A CN113808834B (en) | 2021-09-09 | 2021-09-09 | Three-phase traction and power hybrid transformer for alternating current electric rail transit engineering |
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| CN113808834B true CN113808834B (en) | 2023-07-28 |
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