CN117096928A - Grid connection and unit power supply system of wind turbine generator and wind turbine generator - Google Patents

Grid connection and unit power supply system of wind turbine generator and wind turbine generator Download PDF

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Publication number
CN117096928A
CN117096928A CN202310932433.XA CN202310932433A CN117096928A CN 117096928 A CN117096928 A CN 117096928A CN 202310932433 A CN202310932433 A CN 202310932433A CN 117096928 A CN117096928 A CN 117096928A
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CN
China
Prior art keywords
winding
power supply
grid
wind turbine
transformer
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
CN202310932433.XA
Other languages
Chinese (zh)
Inventor
赵志东
侯晓冬
王宇衡
宋炬烽
程维
苗向文
孙广
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Sinovel Wind Group Co Ltd
Original Assignee
Sinovel Wind Group Co Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Sinovel Wind Group Co Ltd filed Critical Sinovel Wind Group Co Ltd
Priority to CN202310932433.XA priority Critical patent/CN117096928A/en
Publication of CN117096928A publication Critical patent/CN117096928A/en
Pending legal-status Critical Current

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Classifications

    • 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
    • H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
    • H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
    • H02B1/26—Casings; Parts thereof or accessories therefor
    • H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
    • H02B1/32—Mounting of devices therein
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/068—Electronic means for switching from one power supply to another power supply, e.g. to avoid parallel connection
    • 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
    • H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
    • H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
    • H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
    • H02J9/08—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems requiring starting of a prime-mover
    • 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
    • H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
    • H02J2300/20—The dispersed energy generation being of renewable origin
    • H02J2300/28—The renewable source being wind energy

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The invention discloses a grid-connected and unit power supply system of a wind turbine and the wind turbine. The frequency converter, the transformer and the cabin control cabinet are arranged in the cabin, and the switch cabinet and the tower foundation control cabinet are arranged on a platform at the bottom of the tower barrel. The first winding of the transformer is connected with the frequency converter, the second winding generates a second voltage suitable for grid connection, and the third winding provides a third voltage for supplying power to unit equipment; the switch cabinet is connected with the second winding; the cabin control cabinet is connected with the third winding; the frequency converter comprises a first circuit breaker arranged on the power grid side, the switch cabinet comprises a second circuit breaker arranged on the unit side and an isolating switch, and the cabin control cabinet comprises a third circuit breaker arranged on one side connected with the transformer. The invention shortens the connection distance of the low-voltage cables, reduces the use quantity of the low-voltage cables and reduces the cost; and the heat loss of the electric system of the unit is reduced.

Description

Grid connection and unit power supply system of wind turbine generator and wind turbine generator
Technical Field
The invention relates to the technical field of wind power generation, in particular to a grid connection and unit power supply system of a wind turbine and the wind turbine.
Background
Wind power generation is widely popularized in China as a power generation technology utilizing clean energy. In recent years, with the technical progress, the single-machine capacity of the wind generating set is increased, the number of power cables of the set is increased sharply, and a large number of cables are laid inside the tower. The number of torsion-resistant cables entering the tower from the cabin is increased, high requirements are put on yaw design, a large number of cables are twisted along with yaw of the cabin, the cables are rubbed with each other, and abrasion of cable jackets is greatly increased. Meanwhile, cables are piled up together at the saddle bridge position, the cables of the whole torsion section heat, temperature aggregation is caused, and aging of the cables is accelerated. In addition, the consumption of the cable is increased, and the unit kW cost of the unit is greatly influenced.
Disclosure of Invention
In the summary, a series of concepts in a simplified form are introduced, which will be further described in detail in the detailed description. The summary of the invention is not intended to define the key features and essential features of the claimed subject matter, nor is it intended to be used as an aid in determining the scope of the claimed subject matter.
To at least partially solve the above-mentioned problems, according to a first aspect of the present invention, there is provided a grid-connected and generator-fed system of a wind generator set, the wind generator set including a tower and a nacelle located above the tower, in which nacelle a doubly-fed generator converting wind energy into electric energy is mounted, the grid-connected and generator-fed system comprising:
a frequency converter mounted in the nacelle and connected with the doubly fed generator to receive a first voltage generated by the doubly fed generator;
a transformer mounted in the nacelle, the transformer comprising an iron core and a first winding, a second winding and a third winding disposed around the iron core, the first winding being connected to the frequency converter to receive the first voltage, the second winding being arranged to boost the first voltage to a second voltage suitable for grid-tie, the third winding being arranged to reduce the first voltage to a third voltage suitable for powering a unit device;
the switch cabinet is arranged on the platform at the bottom of the tower barrel and is connected with the second winding, so that the second voltage is transmitted to an empty collection line of the wind field pole tower through the switch cabinet to realize grid connection;
a cabin control cabinet mounted in the cabin and connected with the third winding to deliver the third voltage to each unit device;
the tower foundation control cabinet is arranged on the platform at the bottom of the tower barrel and is connected with the switch cabinet and the cabin control cabinet;
the frequency converter comprises a first circuit breaker arranged on the power grid side, the switch cabinet comprises a second circuit breaker arranged on the unit side and a disconnecting switch, and the cabin control cabinet comprises a third circuit breaker arranged on one side connected with the transformer.
Further, the frequency converter is connected with the transformer through a copper bar with soft connection transition, and the copper bar with soft connection transition comprises a frequency converter side copper bar section, a transformer side copper bar section and a copper braid belt arranged between the frequency converter side copper bar section and the transformer side copper bar section.
Further, the nacelle is provided with a compartment for accommodating the transformer, the compartment being provided with an air inlet and an air outlet.
Further, the compartment includes an isolation door provided with a program lock or an electromagnetic lock that interlocks with the second circuit breaker hardware.
Further, the grid-connected and unit power supply system further comprises a diesel generator positioned on a platform at the bottom of the tower barrel, and the tower base control cabinet comprises an emergency power supply interface and a fourth circuit breaker which are connected with the diesel generator.
Further, the cabin control cabinet includes an automatic transfer switch selectively connected with a normal power supply circuit connected to the third winding via the third circuit breaker or an emergency power supply circuit connected to the diesel generator via the fourth circuit breaker, the automatic transfer switch being communicatively connected with the second circuit breaker to be connected to the normal power supply circuit or the emergency power supply circuit according to an open-close state of the second circuit breaker.
Further, the iron core, the first winding, the second winding and the third winding are respectively provided with temperature sensors, and each temperature sensor is respectively connected with a main control system of the unit.
Further, the iron core, the first winding, the second winding, the third winding, the copper bar section on the side of the frequency converter and the copper bar section on the side of the transformer are respectively provided with temperature sensors, and each temperature sensor is respectively connected with a main control system of the unit.
Further, the iron core, the first winding, the second winding, the third winding and the compartment are respectively provided with temperature sensors, and each temperature sensor is respectively connected with a main control system of the unit.
The invention also provides a wind turbine generator system, which comprises the grid-connected and generator power supply system.
According to the grid-connected and unit power supply system of the wind turbine, the frequency converter and the transformer are arranged in the engine room, namely, the whole wind turbine is close to the generator side, so that the connection distance of the low-voltage cable is shortened. On one hand, the use quantity of low-voltage cables is reduced, and the cable cost is reduced; on the other hand, the heat loss of the electric system of the unit is reduced; and avoid a large amount of cables to rub each other in the tower section of thick bamboo and cause wearing and tearing, temperature gathering accelerates cable ageing. In addition, the first breaker for overload and short-circuit protection of the low-voltage side/input end of the transformer is integrally arranged on the power grid side in the frequency converter, so that one low-voltage side breaker can be saved compared with the traditional external box-type transformer; the second breaker for overload and short-circuit protection at the high-voltage side/output end of the transformer is arranged in a switch cabinet positioned on a platform at the bottom of the tower; the third circuit breaker for overload and short-circuit protection on the power supply side of the transformer unit is integrally arranged on the side connected with the transformer in the cabin control cabinet, so that the size of the transformer is reduced as much as possible and the layout of the cabin interior is more compact.
Drawings
The following drawings are included to provide an understanding of the invention and are incorporated in and constitute a part of this specification. Embodiments of the present invention and their description are shown in the drawings to illustrate the devices and principles of the invention. In the drawings of which there are shown,
FIG. 1 is a schematic diagram of a main loop of a grid-connected and unit power supply system of a wind turbine according to an embodiment of the present invention;
FIG. 2 is a schematic connection diagram of a grid-connected and power supply system of a wind turbine according to an embodiment of the present invention;
FIG. 3 is a circuit structure diagram of a grid-connected and unit power supply system of a wind turbine according to an embodiment of the invention;
fig. 4 is a schematic diagram of a copper bar with soft connection transition of a grid connection and unit power supply system of a wind turbine generator according to an embodiment of the invention.
Detailed Description
In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present invention. It will be apparent, however, to one skilled in the art that the invention may be practiced without one or more of these details. In other instances, well-known features have not been described in detail in order to avoid obscuring the invention.
In the following description, a detailed structure will be presented for the purpose of thoroughly understanding the present invention. It will be apparent that the invention is not limited to the specific details set forth in the skilled artisan. The preferred embodiments of the present invention are described in detail below, however, the present invention may have other embodiments in addition to the detailed description, and should not be construed as limited to the embodiments set forth herein.
It is to be understood that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention, as the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. The terms "comprises," "comprising," and/or "including," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. The terms "upper", "lower", "front", "rear", "left", "right" and the like are used herein for illustrative purposes only and are not limiting.
Ordinal numbers such as "first" and "second" cited in the present invention are merely identifiers and do not have any other meaning, such as a particular order or the like. Also, for example, the term "first component" does not itself connote the presence of "second component" and the term "second component" does not itself connote the presence of "first component".
Hereinafter, specific embodiments of the present invention will be described in more detail with reference to the accompanying drawings, which illustrate representative embodiments of the present invention and not limit the present invention.
The invention provides a grid connection and unit power supply system of a wind turbine. The wind turbine generator comprises a tower and a cabin above the tower, and a doubly-fed generator for converting wind energy into electric energy is arranged in the cabin. As shown in fig. 1-3, the grid-connected and unit power supply system of the invention comprises a frequency converter 1, a transformer 2, a switch cabinet 3, a cabin control cabinet 4 and a tower foundation control cabinet 5. Both the frequency converter 1 and the transformer 2 are mounted in the nacelle, the frequency converter 1 being connected with the doubly fed generator 6 to receive the first voltage generated by the doubly fed generator 6. The transformer 2 comprises an iron core and a first winding, a second winding and a third winding arranged around the iron core, the first winding being connected with the frequency converter 1 for receiving a first voltage, the second winding being arranged to boost the first voltage to a second voltage suitable for grid connection, the third winding being arranged to reduce the first voltage to a third voltage suitable for powering the unit equipment. The switch cabinet 3 is installed on the bottom platform of the tower and is connected with the second winding of the transformer 2, so that the second voltage is transmitted to the wind field tower overhead collector line through the switch cabinet 3 to realize grid connection. A cabin control cabinet 4 is mounted in the cabin and connected to the third winding for supplying a third voltage to the respective unit devices for powering the respective unit devices. The tower foundation control cabinet 5 is installed on the tower bottom platform and is connected with the switch cabinet 3 and the cabin control cabinet 4. The frequency converter 1 comprises a first circuit breaker 11 arranged on the power grid side, the switch cabinet 3 comprises a second circuit breaker 31 and an isolating switch 32 arranged on the unit side, and the cabin control cabinet 4 comprises a third circuit breaker 41 arranged on the side connected with the transformer 2. Preferably, the transformer 2 is a dry-type transformer to reduce the amount of routine maintenance of the transformer. According to an embodiment of the invention, the first voltage output by the doubly fed generator 6 is 1.14kV, the second voltage is raised to 35kV by the transformer and is fed to the grid via the switchgear 3, and the third voltage for powering the unit equipment is 400V. The crew arrangement comprises a pitch system 10 in a pitch system hub 9.
According to the grid-connected and unit power supply scheme, the frequency converter and the transformer are arranged in the engine room, namely, the whole is close to the generator side, so that the connection distance of the low-voltage cable is shortened. On one hand, the use quantity of low-voltage cables is reduced, and the cable cost is reduced; on the other hand, the heat loss of the electric system of the unit is reduced; and avoid a large amount of cables to rub each other in the tower section of thick bamboo and cause wearing and tearing, temperature gathering accelerates cable ageing. In addition, the first breaker for overload and short-circuit protection of the low-voltage side/input end of the transformer is integrally arranged on the power grid side in the frequency converter, so that one low-voltage side breaker can be saved compared with the traditional external box-type transformer; the second breaker for overload and short-circuit protection at the high-voltage side/output end of the transformer is arranged in a switch cabinet positioned on a platform at the bottom of the tower; the third circuit breaker for overload and short-circuit protection on the power supply side of the transformer unit is integrally arranged on the side connected with the transformer in the cabin control cabinet, so that the size of the transformer is reduced as much as possible and the layout of the cabin interior is more compact. Preferably, the third winding/unit power supply side of the transformer is also provided with a fuse, which further plays a role in overload and short-circuit protection. Furthermore, the transformer can save one unit auxiliary transformer compared with the traditional unit by arranging a 400V unit power supply tap.
According to an embodiment of the present invention, as shown in fig. 4, the frequency converter 1 and the transformer 2 are connected by a bus, and the bus may employ a copper bar 7 with a soft connection transition, specifically including a frequency converter side copper bar section 71, a transformer side copper bar section 72, and a copper braid 73 disposed between the frequency converter side copper bar section 71 and the transformer side copper bar section 72. The converter adopts the busbar to be connected with the transformer and is favorable to heavy current transmission to through setting up flexible copper braid 73 between the copper bar section of both sides, can avoid vibration to cause the hookup location to strike sparks and even cause the conflagration to take place. Alternatively, the frequency converter 1 and the transformer 2 may be connected by a cable.
According to an embodiment of the invention, the nacelle is provided with a compartment for housing the transformer 2, between which a physical isolating partition plate is arranged, which is reliably grounded, and the partition plate is provided with isolating doors for later maintenance and overhaul of the transformer. The isolation door is provided with a program lock or an electromagnetic lock that forms an interlock with the second circuit breaker 31. Under the condition that the high-voltage side is 35kV, workers cannot enter the compartment, and the workers are prevented from entering the electrified compartment due to misoperation. The maintenance and repair work of the compartment can only be performed after the second circuit breaker 31 of the switchgear 3 is de-energized. The frequency converter and the transformer of the invention may be of integrated design and co-arranged in the cabin compartment.
According to the embodiment of the invention, the compartment is provided with the air inlet and the air outlet, the air inlet is arranged at the bottom of the compartment, a special enclosure structure can be arranged at the air inlet, and the air inlet can effectively flow through the inside of the transformer through the heat dissipation fan of the transformer 2, so that the heat dissipation efficiency is improved. According to a preferred embodiment of the invention, the core, the first winding, the second winding, the third winding, the converter-side copper bar section and the transformer-side copper bar section of the transformer 2 are provided with temperature sensors, respectively. Further, a temperature sensor is also provided in the compartment to monitor the ambient temperature in the compartment. And each temperature sensor is respectively connected with a unit main control system PLC. The unit main control system PLC performs hierarchical control according to a preset temperature threshold value, and when the temperature monitored by the temperature sensor is not more than t1, the heat dissipation system is not started; when the temperature monitored by the temperature sensor reaches t2, starting the cooling fan; when the temperature monitored by the temperature sensor reaches t3, alarming and reducing power to operate; when the temperature monitored by the temperature sensor reaches t4, the unit is stopped. Further, a total submerged fire protection system and an arc protection system can be arranged in the compartment to avoid fire.
According to an embodiment of the invention, the grid-connected and unit power supply system further comprises a diesel generator 8 positioned on a platform at the bottom of the tower, and the tower base control cabinet 5 comprises an emergency power supply interface 51 and a fourth circuit breaker 52 for connecting with the diesel generator 8. When the 35kV power supply on the high-voltage side of the transformer is disconnected, the 400V power supply on the power supply side of the unit is powered down because the self-consumed power of the unit equipment is taken from the third winding of the transformer, and at the moment, the fourth circuit breaker 82 is switched on and the diesel generator 8 is started to supply power for the unit equipment in an emergency.
According to an embodiment of the invention, the cabin control cabinet comprises an ATS, i.e. an automatic transfer switch 42, the automatic transfer switch 42 being selectively connected to a normal power supply circuit or an emergency power supply circuit, the normal power supply circuit being connected to the third winding of the transformer 2 via a third circuit breaker 41, the emergency power supply circuit being connected to the diesel generator 8 via a fourth circuit breaker 82, the automatic transfer switch 42 being in communication with the second circuit breaker 31, the automatic transfer switch 42 switching in the normal power supply circuit to conduct the normal power supply circuit when the second circuit breaker 31 is switched on; when the second circuit breaker 31 is opened, the automatic transfer switch 42 is connected to the emergency power supply circuit to conduct the emergency power supply circuit, so that the diesel generator 8 supplies power for the unit equipment when the high-voltage side of the transformer is powered off. The state feedback contact of the ATS device and an emergency power supply loop where the diesel generator is located form locking, so that the situation that the emergency power supply loop is connected to the low-voltage side of the transformer to reversely transmit power to the high-voltage side is avoided, and the situation that the diesel generator cannot be closed due to exciting inrush current is avoided.
According to the embodiment of the invention, the lightning arrester 21 is arranged on the high-voltage side of the transformer 2, and the lightning arresters 33 are arranged on the power grid side of the switch cabinet 3 for lightning protection, so that lightning current is prevented from entering the electrical equipment of the unit through an electrical circuit and a tower cable.
When the wind turbine generator is in a standby state, the second circuit breaker 31 of the switch cabinet 3 is in a closing state, the isolating switch 32 is in a circuit closing state, the high-voltage side of the transformer 2 is electrified, the power of the unit equipment is obtained from the power consumption through the third winding of the transformer 2 and is used as the power source of the whole unit, the first circuit breaker 11 on the power grid side of the frequency converter 1 is in a closing state, the stator contactor 12 is in a separating state, the whole unit is in a standby state, and grid-connected power generation can be started at any time under the condition that the wind speed reaches the starting wind speed and the unit main control system detects that the unit has no faults.
When the wind turbine generator is in a normal power generation state, the second circuit breaker 31 of the switch cabinet 3 is in a closing state, the isolating switch 32 is in a circuit closing state, the high-voltage side of the transformer is electrified, the power of the whole turbine generator is obtained through the third winding of the transformer 2 from the power consumption of the turbine generator, the power is used as the power source of the control equipment, the first circuit breaker 11 on the power grid side of the frequency converter 1 is in a closing state, the stator contactor 12 is closed after the turbine generator reaches a grid-connected condition, and the whole turbine generator is in a grid-connected power generation state.
When the frequency converter 1 or the transformer 2 needs to be overhauled, the risk of touching a high-voltage power supply exists, the second circuit breaker 31 of the switch cabinet 3 needs to be disconnected before overhauling, the isolating switch 32 is arranged at the grounding position, the 35kV line is ensured to be thoroughly disconnected, and the isolating door of the compartment can be further opened only in the state through a program lock key, so that the danger that a worker enters the compartment by mistake in the state of taking a point is avoided. In addition, in the case where the second circuit breaker 31 is opened, the automatic transfer switch 42 is switched from the normal power supply circuit to the emergency power supply circuit. When the 35kV line is restored, the power supply side of the transformer unit is restored to supply power, the automatic change-over switch 42 is automatically switched to the sign power supply loop, and the transformer 2 supplies 400V self-power for unit equipment.
Those of skill in the art will appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, or combinations of computer software and electronic hardware. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the solution. The skilled artisan may use different methods for each particular application to achieve the described functionality, but such implementation should not be considered to be beyond the scope of the embodiments of the present disclosure.
The steps of a method or algorithm described in connection with the embodiments disclosed herein may be embodied directly in hardware, in a software module executed by a processor, or in a combination of the two. The software modules may be disposed in Random Access Memory (RAM), memory, read Only Memory (ROM), electrically programmable ROM, electrically erasable programmable ROM, registers, hard disk, a removable disk, a CD-ROM, or any other form of storage medium known in the art.
In the embodiments disclosed herein, the disclosed methods, articles of manufacture (including but not limited to devices, apparatuses, etc.) may be practiced in other ways. For example, the apparatus embodiments described above are merely illustrative, and for example, the division of the units may be merely a logical function division, and there may be additional divisions when actually implemented, for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. In addition, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
Unless defined otherwise, technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains. The terminology used herein is for the purpose of describing particular implementations only and is not intended to be limiting of the invention. Terms such as "part," "member" and the like as used herein can refer to either a single part or a combination of parts. Terms such as "mounted," "disposed," and the like as used herein may refer to one component being directly attached to another component or to one component being attached to another component through an intermediary. Features described herein in one embodiment may be applied to another embodiment alone or in combination with other features unless the features are not applicable or otherwise indicated in the other embodiment.
The present invention has been described in terms of the above embodiments, but it should be understood that the above embodiments are for purposes of illustration and description only and are not intended to limit the invention to the embodiments described. In addition, it will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, and that many variations and modifications may be made in accordance with the teachings of the present invention, which fall within the scope of the claimed invention. The scope of the invention is defined by the appended claims and equivalents thereof.

Claims (10)

1. Grid-connected and unit power supply system of wind turbine generator system, wind turbine generator system includes a tower section of thick bamboo and is located the cabin of tower section of thick bamboo top, install the doubly-fed generator that converts wind energy into electric energy in the cabin, its characterized in that, grid-connected and unit power supply system includes:
a frequency converter mounted in the nacelle and connected with the doubly fed generator to receive a first voltage generated by the doubly fed generator;
a transformer mounted in the nacelle, the transformer comprising an iron core and a first winding, a second winding and a third winding disposed around the iron core, the first winding being connected to the frequency converter to receive the first voltage, the second winding being arranged to boost the first voltage to a second voltage suitable for grid-tie, the third winding being arranged to reduce the first voltage to a third voltage suitable for powering a unit device;
the switch cabinet is arranged on the platform at the bottom of the tower barrel and is connected with the second winding, so that the second voltage is transmitted to an empty collection line of the wind field pole tower through the switch cabinet to realize grid connection;
a cabin control cabinet mounted in the cabin and connected with the third winding to deliver the third voltage to each unit device;
the tower foundation control cabinet is arranged on the platform at the bottom of the tower barrel and is connected with the switch cabinet and the cabin control cabinet;
the frequency converter comprises a first circuit breaker arranged on the power grid side, the switch cabinet comprises a second circuit breaker arranged on the unit side and a disconnecting switch, and the cabin control cabinet comprises a third circuit breaker arranged on one side connected with the transformer.
2. The grid-connected and generator-power supply system of a wind turbine according to claim 1, wherein the frequency converter and the transformer are connected through copper bars with soft connection transition, and the copper bars with soft connection transition comprise a frequency converter side copper bar section, a transformer side copper bar section and a copper braid belt arranged between the frequency converter side copper bar section and the transformer side copper bar section.
3. Grid connection and unit power supply system of a wind turbine according to claim 1, characterized in that the nacelle is provided with a compartment for accommodating the transformer, which compartment is provided with an air inlet and an air outlet.
4. A grid tie and crew power system for a wind turbine according to claim 3, wherein the compartment includes an isolation door provided with a program lock or an electromagnetic lock, which is interlocked with the second circuit breaker hardware.
5. The grid-tie and unit power system of claim 1, further comprising a diesel generator positioned on a platform at the bottom of the tower, wherein the tower base control cabinet comprises an emergency power supply interface and a fourth circuit breaker for connecting with the diesel generator.
6. The grid tie and unit power supply system of a wind turbine of claim 5, wherein the nacelle control cabinet includes an automatic transfer switch selectively connected to a normal power supply loop or an emergency power supply loop, the normal power supply loop being connected to the third winding via the third circuit breaker, the emergency power supply loop being connected to the diesel generator via the fourth circuit breaker, the automatic transfer switch being communicatively connected to the second circuit breaker to connect to the normal power supply loop or the emergency power supply loop depending on an open-close state of the second circuit breaker.
7. The grid-connected and unit power supply system of a wind turbine generator system according to claim 1, wherein the iron core, the first winding, the second winding and the third winding are respectively provided with temperature sensors, and each temperature sensor is respectively connected with a main control system of the wind turbine generator system.
8. The grid-connected and unit power supply system of a wind turbine generator system according to claim 2, wherein the iron core, the first winding, the second winding, the third winding, the copper bar section on the side of the frequency converter and the copper bar section on the side of the transformer are respectively provided with temperature sensors, and each temperature sensor is respectively connected with a main control system of the wind turbine generator system.
9. A grid connection and a power supply system for a wind turbine according to claim 3, wherein the iron core, the first winding, the second winding, the third winding and the compartment are respectively provided with temperature sensors, and each temperature sensor is respectively connected with a main control system of the wind turbine.
10. A wind power plant, characterized in that it comprises a grid-connected and plant power supply system according to any of claims 1 to 9.
CN202310932433.XA 2023-07-27 2023-07-27 Grid connection and unit power supply system of wind turbine generator and wind turbine generator Pending CN117096928A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202310932433.XA CN117096928A (en) 2023-07-27 2023-07-27 Grid connection and unit power supply system of wind turbine generator and wind turbine generator

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CN202310932433.XA CN117096928A (en) 2023-07-27 2023-07-27 Grid connection and unit power supply system of wind turbine generator and wind turbine generator

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