CN111383825A - Dry-type transformer winding structure for grid-connected photovoltaic power generation - Google Patents

Dry-type transformer winding structure for grid-connected photovoltaic power generation Download PDF

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Publication number
CN111383825A
CN111383825A CN201811619241.9A CN201811619241A CN111383825A CN 111383825 A CN111383825 A CN 111383825A CN 201811619241 A CN201811619241 A CN 201811619241A CN 111383825 A CN111383825 A CN 111383825A
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CN
China
Prior art keywords
low
group
voltage windings
voltage
windings
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CN201811619241.9A
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Chinese (zh)
Inventor
杨云峰
史军杨
粱敬华
陈敏
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Xi'an Tianhong Electric Co ltd
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Xi'an Tianhong Electric Co ltd
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Priority to CN201811619241.9A priority Critical patent/CN111383825A/en
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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
    • 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
    • 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
    • Y02E10/00—Energy generation through renewable energy sources
    • Y02E10/50—Photovoltaic [PV] energy
    • Y02E10/56—Power conversion systems, e.g. maximum power point trackers

Abstract

A dry-type transformer winding structure for grid-connected photovoltaic power generation is characterized in that an iron core is positioned on the innermost layer, a low-voltage winding is arranged on the outer side of the iron core, and a high-voltage winding is arranged on the outer side of the low-voltage winding; the second axial direction of the low-voltage winding is split into four independent windings; the first group of low-voltage windings and the second group of low-voltage windings are positioned on the upper portion of the low-voltage windings, the third group of low-voltage windings and the fourth group of low-voltage windings are positioned on the lower portion of the low-voltage windings, the first group of high-voltage windings are positioned on the upper portion of the high-voltage windings, and the second group of high-voltage windings are positioned on the lower portion of. The second and fourth sets of low voltage windings are located outside the first and third sets of low voltage windings. The low-voltage side short-circuit current can be effectively inhibited, and the investment on selected equipment can be saved. When the high-voltage winding and the low-voltage winding run simultaneously, the through impedance of the transformer with the structure is completely the same as the short-circuit impedance value of a common transformer, and when one end of the low-voltage side is short-circuited, the short-circuit current is small due to large split impedance.

Description

Dry-type transformer winding structure for grid-connected photovoltaic power generation
Technical Field
The invention relates to the technical field of transformer winding structures, in particular to a dry-type transformer winding structure for grid-connected photovoltaic power generation.
Background
At present, in photovoltaic power generation and inversion technologies, because the output voltage of an inverter is low, the output voltage of the inverter must be boosted to a voltage level which can meet grid connection requirements through a step-up transformer. Due to the limitation of the power of electronic components, the photovoltaic power generation inverter applied to the photovoltaic grid-connected power station generally does not exceed 500 kW. Therefore, the boosting transformer for photovoltaic power generation generally adopts a low-voltage winding axial four-split structure, and the structure can meet the requirement that one boosting transformer can be simultaneously connected with four inverters. The coil of each phase of the step-up transformer with the structure is divided into an upper part and a lower part, each part is provided with a high-voltage coil and a low-voltage coil, namely, each phase is provided with 8 coils, and each transformer is provided with 24 coils. Large occupied area, high manufacturing cost, low production efficiency and the like.
However, the analysis shows that the existing dry-type transformer winding structure for grid-connected photovoltaic power generation has the following defects; one is as follows: large floor area, the second is: the manufacturing cost is high; and thirdly: the production efficiency is low.
Disclosure of Invention
Therefore, in order to solve the above-mentioned disadvantages, the present invention provides a dry-type transformer winding structure for grid-connected photovoltaic power generation.
A dry-type transformer winding structure for grid-connected photovoltaic power generation comprises a first group of high-voltage windings 5, a second group of high-voltage windings 6, an iron core 7, a first group of low-voltage windings 17, a second group of low-voltage windings 18, a third group of low-voltage windings 19 and a fourth group of low-voltage windings 4; the first group of low-voltage windings 17, the second group of low-voltage windings 18, the third group of low-voltage windings 19 and the fourth group of low-voltage windings 4 are independently input, and the first group of high-voltage windings 5 and the second group of high-voltage windings 6 are output after being connected in parallel; the iron core 7 is positioned at the innermost layer, the low-voltage winding is arranged on the outer side of the iron core 7, and the high-voltage winding is arranged on the outer side of the low-voltage winding; the second axial direction of the low-voltage winding is split into four independent windings; the first and second groups of low voltage windings 17 and 18 are located on the upper part of the low voltage windings, the third and fourth groups of low voltage windings 19 and 4 are located on the lower part of the low voltage windings, the first group of high voltage windings 5 is located on the upper part of the high voltage windings and the second group of high voltage windings 6 is located on the lower part of the high voltage windings. The second set of low voltage windings 18 and the fourth set of low voltage windings 4 are located outside the first set of low voltage windings 17 and the third set of low voltage windings 19.
Preferably, the low-voltage wire specifications and the number of turns of the first group of low-voltage windings 17, the second group of low-voltage windings 18, the third group of low-voltage windings 19 and the fourth group of low-voltage windings 4 are the same.
Optimally, the transformer capacities of the first group of low-voltage windings 17, the second group of low-voltage windings 18, the third group of low-voltage windings 19 and the fourth group of low-voltage windings 4 are the same.
Preferably, the high-voltage wire specifications, the number of turns and the structure of the first group of high-voltage windings 5 and the second group of high-voltage windings 6 are identical.
Optimally, the transformer bank capacity of the first set of high voltage windings 5 and the second set of high voltage windings 6 is the same.
The invention has the following advantages:
① can effectively suppress the short-circuit current on the low-voltage side, and can save investment on selected equipment, when the high-voltage winding and the low-voltage winding run simultaneously, the through impedance of the transformer with the structure is completely the same as the short-circuit impedance of the common transformer, and when one end of the low-voltage side is in short circuit, the short-circuit current is smaller because the split impedance is larger.
② the position of the first and second groups of low voltage windings 1 and 2 or the third and fourth groups of low voltage windings 3 and 4 relative to the first and second groups of high voltage windings 5 and 6 can be adjusted as required to increase the split impedance between the first and second groups of low voltage windings 1 and 2 or the third and fourth groups of low voltage windings 3 and 4 and reduce the mutual inductance.
③, the difficulty of design and manufacturing process is greatly reduced, and the production efficiency of the product is improved.
④, the height of the iron core 7 is effectively reduced, thereby reducing the overall height of the transformer and improving the stability of the transformer.
Drawings
FIG. 1 is a schematic structural view of examples 1 to 2 of the present invention;
FIG. 2 is a schematic structural view of examples 1 to 2 of the present invention;
sequence numbers shown in the figures: the transformer comprises an insulating layer 3, a fourth group of low-voltage windings 4, a first group of high-voltage windings 5, a second group of high-voltage windings 6, an iron core 7, an iron core 8, a fifth group of low-voltage windings 9, a sixth group of low-voltage windings 10, a seventh group of low-voltage windings 11, an eighth group of low-voltage windings 12, a third group of high-voltage windings 13, a fourth group of high-voltage windings 14, a fifth group of high-voltage windings 15, a sixth group of high-voltage windings 16, a first group of low-voltage windings 17, a second group of low-voltage windings 18 and a third.
Detailed Description
The present invention will be described in detail with reference to fig. 1-2, and the technical solutions in the embodiments of the present invention will be clearly and completely described, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without any creative effort belong to the protection scope of the present invention; furthermore, the terms "first," "second," "third," "upper, lower, left, right," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Meanwhile, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "connected" and "connected" should be interpreted broadly, for example, as being fixedly connected, detachably connected, or integrally connected; the connection can be mechanical connection or electrical connection; may be directly connected or indirectly connected through an intermediate. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
Example 1
A dry-type transformer winding structure for grid-connected photovoltaic power generation, which is shown in fig. 1-2 and comprises a first group of high-voltage windings 5, a second group of high-voltage windings 6, an iron core 7, a first group of low-voltage windings 17, a second group of low-voltage windings 18, a third group of low-voltage windings 19 and a fourth group of low-voltage windings 4; the first group of low-voltage windings 17, the second group of low-voltage windings 18, the third group of low-voltage windings 19 and the fourth group of low-voltage windings 4 are independently input, and the first group of high-voltage windings 5 and the second group of high-voltage windings 6 are output after being connected in parallel.
The iron core 7 is positioned at the innermost layer, the low-voltage winding is arranged on the outer side of the iron core 7, and the high-voltage winding is arranged on the outer side of the low-voltage winding; the second axial direction of the low-voltage winding is split into four independent windings; the first and second groups of low voltage windings 17 and 18 are located on the upper part of the low voltage windings, the third and fourth groups of low voltage windings 19 and 4 are located on the lower part of the low voltage windings, the first group of high voltage windings 5 is located on the upper part of the high voltage windings and the second group of high voltage windings 6 is located on the lower part of the high voltage windings. The second set of low voltage windings 18 and the fourth set of low voltage windings 4 are located outside the first set of low voltage windings 17 and the third set of low voltage windings 19.
The first group of low-voltage windings 17, the second group of low-voltage windings 18, the third group of low-voltage windings 19 and the fourth group of low-voltage windings 4 have the same low-voltage wire specification and the same number of turns.
The transformer capacities of the first group of low-voltage windings 17, the second group of low-voltage windings 18, the third group of low-voltage windings 19 and the fourth group of low-voltage windings 4 are the same.
The specification, the number of turns and the structure of the high-voltage wire of the first group of high-voltage windings 5 and the second group of high-voltage windings 6 are completely the same.
The transformer bank capacity of the first set of high voltage windings 5 and the second set of high voltage windings 6 is the same.
Example 2
The dry-type transformer winding structure for grid-connected photovoltaic power generation, wherein the low voltage is a two-axial two-radial split structure and comprises a first group of high-voltage windings 5, a second group of high-voltage windings 6, an iron core 7, a first group of low-voltage windings 17, a second group of low-voltage windings 18, a third group of low-voltage windings 19 and a fourth group of low-voltage windings 4. The first group of low-voltage windings 17, the second group of low-voltage windings 18, the third group of low-voltage windings 19 and the fourth group of low-voltage windings 4 are independently input, and the first group of high-voltage windings 5 and the second group of high-voltage windings 6 are output after being connected in parallel.
The dry-type transformer winding structure for grid-connected photovoltaic power generation in the embodiment comprises an iron core 7, a first group of low-voltage windings 17 and a third group of low-voltage windings 19 are sleeved on the outer side of the iron core 7, a second group of low-voltage windings 18 and a fourth group of low-voltage windings 4 are arranged on the outer sides of the first group of low-voltage windings 17 and the third group of low-voltage windings 19, a first group of high-voltage windings 5 and a second group of high-voltage windings 6 are arranged on the outer sides of the second group of low-voltage windings 18 and the fourth group of low-voltage windings 4, the first group of low-voltage windings 17, the third group of low-voltage windings 19, the second group of low-voltage windings 18, the fourth group of low-voltage windings 4, the first group of high-voltage windings 5 and the second group of high-voltage windings 6 are arranged in an axial double-split manner, the first group of, The fourth group of low voltage windings 4 are insulated from each other and are electrically independent from each other but in magnetic communication. The first group of high voltage windings 5 and the second group of high voltage windings 6 are output in parallel with each other. Because the height of reactance between the first group of low-voltage winding 17, the second group of low-voltage winding 18 and the first group of high-voltage winding 5 is equal to the height of reactance between the third group of low-voltage winding 19, the fourth group of low-voltage winding 4 and the second group of high-voltage winding 6, the high-voltage winding and the low-voltage winding have good ampere-turn balance relationship, and the magnetic leakage is reduced.
The dry-type transformer winding structure for grid-connected photovoltaic power generation has good manufacturability and efficiency, effectively reduces the height of the iron core 7, improves the overall stability of the transformer, and reduces the overall manufacturing difficulty and cost of products.
The dry-type transformer winding structure for grid-connected photovoltaic power generation adopts a low-voltage two-axial two-radial split structure mode, and when all low-voltage windings run in parallel and the high-voltage windings also run in a parallel mode, the impedance measured between the high-voltage windings and the low-voltage windings is ride-through impedance. Therefore, when one of the four low-voltage windings is open-circuited and the other low-voltage winding is operated, three-quarters of the through impedance is generated between the high-voltage winding and the low-voltage winding in the operation mode; when two groups of low-voltage windings are open-circuited, other low-voltage windings operate, and in the operating mode, half-through impedance can be generated between the high-voltage windings and the low-voltage windings; when three of the low voltage windings are open and the other low voltage windings are operating, in this mode of operation, a quarter-cross impedance is created between the high voltage winding and the low voltage winding. The low voltage is in a two-axial two-radial split structure form, so that the short circuit resistance of the transformer is greatly improved.
The first group of low voltage windings 1 and the second group of low voltage windings 18 are located almost exactly at the same position in the axial direction with respect to the first group of high voltage windings 5, i.e. the location of the leakage field with respect to the first group of high voltage windings 5 is exactly the same, and the half-cross impedance with respect to the high voltage windings is the same, so that no circulating current is generated between the two parallel high voltage windings when the transformer is in load operation. Similarly, the third group of low-voltage windings 19 and the fourth group of low-voltage windings 4 are located almost exactly at the same position in the axial direction with respect to the second group of high-voltage windings 6, i.e. the location of the leakage field with respect to the second group of high-voltage windings 6 is exactly the same, and the half-cross impedance with respect to the high-voltage windings is the same, so that no circulating current is generated between the two parallel high-voltage windings when the transformer is in load operation.
The first set of low voltage windings 17 has the same number of coil turns as the second set of low voltage windings 18. Of course, the number of coil turns of the first group of low voltage windings 17 and the second group of low voltage windings 18 may also be different.
The third group of low voltage windings 19 has the same number of coil turns as the fourth group of low voltage windings 4. Of course, the number of coil turns of the third group of low voltage windings 19 and the fourth group of low voltage windings 4 may also be different.
The first group of high voltage windings 5 has the same number of turns as the second high voltage winding 6. Of course, the number of turns of the first group of high voltage windings 5 and the second group of high voltage windings 6 may also be different.
The dry-type transformer winding structure for grid-connected photovoltaic power generation is particularly suitable for a power transmission and distribution system of a three-phase boosting transformer for photovoltaic power generation.
The invention has the following advantages:
① can effectively suppress the short-circuit current on the low-voltage side, and can save investment on selected equipment, when the high-voltage winding and the low-voltage winding run simultaneously, the through impedance of the transformer with the structure is completely the same as the short-circuit impedance of the common transformer, and when one end of the low-voltage side is in short circuit, the short-circuit current is smaller because the split impedance is larger.
② the mutual inductance can be reduced by adjusting the position of the first and second groups of low voltage windings 17 and 18 or the third and fourth groups of low voltage windings 19 and 4 relative to the first and second groups of high voltage windings 5 and 6 to increase the split impedance between the first and second groups of low voltage windings 17 and 18 or the third and fourth groups of low voltage windings 19 and 4.
③, the difficulty of design and manufacturing process is greatly reduced, and the production efficiency of the product is improved.
④, the height of the iron core 7 is effectively reduced, thereby reducing the overall height of the transformer and improving the stability of the transformer.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims (6)

1. A dry-type transformer winding structure for grid-connected photovoltaic power generation is characterized by comprising a first group of high-voltage windings (5), a second group of high-voltage windings (6), an iron core (7), a first group of low-voltage windings (17), a second group of low-voltage windings (18), a third group of low-voltage windings (19) and a fourth group of low-voltage windings (4); the first group of low-voltage windings (17), the second group of low-voltage windings (18), the third group of low-voltage windings (19) and the fourth group of low-voltage windings (4) are independently input, and the first group of high-voltage windings (5) and the second group of high-voltage windings (6) are output after being connected in parallel;
the iron core (7) is positioned at the innermost layer, the low-voltage winding is arranged on the outer side of the iron core (7), and the high-voltage winding is arranged on the outer side of the low-voltage winding; the second axial direction of the low-voltage winding is split into four independent windings; the first group of low-voltage windings (17) and the second group of low-voltage windings (18) are positioned on the upper portion of the low-voltage windings, the third group of low-voltage windings (19) and the fourth group of low-voltage windings (4) are positioned on the lower portion of the low-voltage windings, the first group of high-voltage windings (5) are positioned on the upper portion of the high-voltage windings, and the second group of high-voltage windings (6) are positioned on the lower portion of.
2. The second (18) and fourth (4) groups of low voltage windings are located outside the first (17) and third (19) groups of low voltage windings.
3. The winding structure of the dry-type transformer for grid-connected photovoltaic power generation according to claim 1, wherein the low-voltage wires of the first group of low-voltage windings (17), the second group of low-voltage windings (18), the third group of low-voltage windings (19) and the fourth group of low-voltage windings (4) have the same specification and number of turns.
4. The dry-type transformer winding structure for grid-connected photovoltaic power generation according to claim 1, wherein transformer capacities of the first group of low-voltage windings (17), the second group of low-voltage windings (18), the third group of low-voltage windings (19) and the fourth group of low-voltage windings (4) are the same.
5. The winding structure of the dry-type transformer for grid-connected photovoltaic power generation according to claim 1, wherein the high-voltage wire of the first group of high-voltage windings (5) and the high-voltage wire of the second group of high-voltage windings (6) have the same specification, number of turns and structure.
6. The dry-type transformer winding structure for grid-connected photovoltaic power generation according to claim 1, wherein the transformer bank capacity of the first group of high-voltage windings (5) and the second group of high-voltage windings (6) is the same.
CN201811619241.9A 2018-12-28 2018-12-28 Dry-type transformer winding structure for grid-connected photovoltaic power generation Pending CN111383825A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN201811619241.9A CN111383825A (en) 2018-12-28 2018-12-28 Dry-type transformer winding structure for grid-connected photovoltaic power generation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN201811619241.9A CN111383825A (en) 2018-12-28 2018-12-28 Dry-type transformer winding structure for grid-connected photovoltaic power generation

Publications (1)

Publication Number Publication Date
CN111383825A true CN111383825A (en) 2020-07-07

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Application Number Title Priority Date Filing Date
CN201811619241.9A Pending CN111383825A (en) 2018-12-28 2018-12-28 Dry-type transformer winding structure for grid-connected photovoltaic power generation

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Application publication date: 20200707