CN106611994B - Standby power supply system of offshore wind field fan - Google Patents
Standby power supply system of offshore wind field fan Download PDFInfo
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- CN106611994B CN106611994B CN201510707612.9A CN201510707612A CN106611994B CN 106611994 B CN106611994 B CN 106611994B CN 201510707612 A CN201510707612 A CN 201510707612A CN 106611994 B CN106611994 B CN 106611994B
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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Abstract
The invention provides a standby power supply system of an offshore wind farm fan, which at least comprises a power generation module, a boosting device, a power transmission network, a step-down device and a power distribution switch device, wherein the power generation module and the boosting device are connected to the fan 400V system through the power transmission network, the step-down device and the power distribution switch device. The standby power supply system of the offshore wind farm fan can improve the safety and reliability of the fan and the durability of equipment, and the whole standby power supply system has the advantages of good economy and practicality and convenient implementation.
Description
Technical Field
The invention relates to an offshore wind farm electrical engineering;
in particular to a standby power supply system capable of remarkably improving the safety, reliability and viability of an offshore wind turbine.
Background
The offshore wind turbine is generally provided with standby power supplies such as UPS (uninterrupted Power supply) and super capacitor, but the capacity is smaller, the working time is within 1-2 hours, the wind turbine cannot be in a power state for a long time, the long-term operation of a system affecting the safety of the wind turbine such as yaw, dehumidification and fire control cannot be guaranteed, along with the large-scale development of offshore wind power, the safety of the offshore wind turbine is more and more important, and the provision of an effective, continuous and reliable standby power supply system for the wind turbine is very necessary. The method has the following specific effects:
1. during construction, after the offshore transformer station is in place or the land centralized control center is built, laying construction of the high-voltage sea cable is sent out or power grid project is not completed, hoisting of part of fans can be completed before power transmission of the offshore transformer station or the land centralized control center, in-site current collection sea cable laying, debugging work, acceptance work, production preparation work and repair and elimination work of the fans are all required, and an alternating current power supply is indispensable. Before the whole wind field is powered on, an emergency standby power supply can be utilized to supply power to each fan, a series of adjusting work before the fan formally generates power is completed, the efficiency is improved, and the construction progress of the wind field is accelerated.
2. During operation, the main sending submarine cable has a fault, and the submarine cable has long repair time and needs a plurality of weeks at maximum, so that an alternating current emergency standby power supply is needed in order to ensure the necessary power supply of the platform, such as a fire protection power supply, a storage battery charging power supply and the like; meanwhile, in order to protect the offshore wind turbine, a dehumidification system, a control system, a pitch system and a yaw system of the offshore wind turbine also need long-term power supply of an emergency power supply.
3. Under extreme weather conditions such as typhoons, large-scale power failure occurs in a power grid, and the emergency standby power supply of an offshore transformer substation or a land centralized control center can supply power to the fan, so that the survivability of the fan in the period is improved.
The emergency standby power supply is applied to various industries, a transformer for a station in a wind farm boosting transformer substation is generally considered to be used as a boosting transformer, the voltage is increased from 400V to 35kV, a 35kV bus of an offshore transformer substation is connected, then a 35kV submarine cable is connected to a 35kV ring main unit of each fan, and the wind turbine is powered by the power supply after being reduced by the fan transformer. However, since the 35kV submarine cable system has high-capacity charging power, and the no-load loss Po of the main transformer of the fan is large, the electric energy loss is quite large during operation, a high-power generator, such as a 300MW offshore wind farm, needs to be configured, the power of the generator can reach tens of thousands of kW, the investment is huge, the operation and maintenance cost is high, the operation and maintenance cost is quite uneconomical, and the system can not be practically used as a standby power system of an offshore fan.
Disclosure of Invention
In view of the above-mentioned shortcomings of the prior art, the present invention is to provide a backup power system that uses a low-power generator as a power source and can be reliably and safely delivered to the fan 400V side, so as to overcome the above-mentioned shortcomings of the prior art.
To achieve the above and other related objects, the present invention provides an offshore wind farm fan backup power system, at least comprising a power generation module, a step-up device, a power transmission network, a step-down device and a power distribution switching device,
the power generation module adopts a generator with power not more than 1000KW installed in a land or sea transformer substation;
the boosting equipment adopts a boosting transformer installed in a land or marine transformer substation;
the power transmission network comprises 35kV switch equipment, a 35kV submarine cable network and fan high-voltage side ring network equipment which are used for voltage reduction in a land or marine transformer substation;
the step-down equipment adopts a main transformer when the fan normally operates;
the power distribution switch equipment adopts medium voltage switch equipment which is parallel to a medium voltage breaker of a fan stator loop, and the medium voltage switch equipment is opened when a wind field normally operates, and is closed when a standby power supply is in a power supply mode.
Preferably, the generator is arranged in an onshore wind farm centralized control center or an offshore boosting transformer station.
Preferably, the generator is a fixedly mounted diesel generator or a mobile emergency power supply generator car.
Preferably, the power transmission network is a sea cable current collection circuit network of a 35kV switch cabinet and a fan in normal operation in an offshore wind farm, and is a fan 35kV ring main unit.
Preferably, the power transmission network and the voltage reduction equipment are existing 35kV equipment and 35kV power transmission network, and the voltage reduction is used in a standby power supply mode.
Preferably, the boosting device is a boosting transformer and a 35kV switch cabinet which are fixedly installed, and the rated voltage ratio is 0.4/2.2kV or 0.4/4.7kV or other transformation ratio.
Preferably, the voltage reducing equipment is a main transformer of a fan, and the rated voltage ratio is 2.2/0.4kV or 4.7/0.4kV or other transformation ratio.
Because sea cable charging power and no-load loss of the transformer are in direct proportion to the square of voltage, the voltage of the sea cable power transmission network is reduced, the system charging power and the electric energy loss are greatly reduced, and through the technical scheme, the electric energy generated by the diesel generator is transmitted to the fan 400V side by utilizing the existing sea cable network and power transmission and transformation equipment, and the fan is used by each system under the condition of stopping, so that the safety and the reliability of the fan and the durability of the equipment are effectively ensured, and the whole standby power supply system is good in economical efficiency and practicability.
Drawings
FIG. 1 shows a system schematic diagram of the offshore wind farm fan backup power system of the present invention.
Description of element numbers:
1. power generation module
2. Boosting device
3. Power transmission network
4. Pressure reducing device
5. Power distribution switchgear
Detailed Description
Further advantages and effects of the present invention will become apparent to those skilled in the art from the disclosure of the present invention, which is described by the following specific examples.
Please refer to fig. 1. It should be understood that the structures, proportions, sizes, etc. shown in the drawings are for illustration purposes only and should not be construed as limiting the invention to the extent that it can be practiced, since modifications, changes in the proportions, or otherwise, used in the practice of the invention, are not intended to be critical to the essential characteristics of the invention, but are intended to fall within the spirit and scope of the invention. Also, the terms such as "upper," "lower," "left," "right," "middle," and "a" and the like recited in the present specification are merely for descriptive purposes and are not intended to limit the scope of the invention, but are intended to provide relative positional changes or modifications without materially altering the technical context in which the invention may be practiced.
Referring to fig. 1, the invention provides a standby power supply system for a wind farm fan at sea, which at least comprises a power generation module 1, a boosting device 2, a power transmission network 3, a voltage reduction device 4 and a power distribution switch device 5, wherein the power generation module 1 and the boosting device 2 are connected to the fan 400V system through the power transmission network 3, the voltage reduction device 4 and the power distribution switch device 5.
The power generation module 1 adopts a fixed diesel generator or a mobile emergency power supply power generation vehicle which is arranged in a land wind field centralized control center or a marine booster transformer substation. The power of the generator is not more than 1000KW, preferably 800KW.
The boosting device 2 adopts a boosting transformer and a 35kV switch cabinet which are fixedly installed in a land or marine transformer substation, and the rated voltage ratio is 0.4/2.2kV or 0.4/4.7kV or other transformation ratios.
The power transmission network 3 and the voltage reduction device 4 are existing 35kV equipment and 35kV power transmission networks, and are used for voltage reduction in a standby power supply mode. The power transmission network 3 is particularly a 35kV sea cable current collection circuit network of a 35kV switch cabinet and a fan in normal operation in an offshore wind farm, and a high-voltage side ring network device of the fan 35kV fan. The voltage reducing device 4 specifically adopts a main transformer in normal operation of the fan, and the rated voltage ratio is 2.2/0.4kV or 4.7/0.4kV or other transformation ratios.
The distribution switchgear 5 adopts a medium voltage switchgear parallel to a medium voltage breaker of a stator loop of the fan, the medium voltage switchgear is opened during normal operation of a wind farm, and is closed during a standby power supply mode, and is connected to a 400V system of the fan.
The rated voltage of the fan stator is Un1, in order to enable 400V power to be supplied through the main fan transformer under an emergency standby state, the rated voltage of a system network is 35/Un1×0.4kV, an offshore wind turbine is generally provided with a main transformer, the high-voltage side of the main transformer is 35kV, the low-voltage side of the main transformer is the rated voltage of the stator, the rated voltage of a wind turbine outlet is improved along with the increase of the single machine capacity of the offshore wind turbine, for example, the rated voltage of a Hua Rui MW wind turbine is 6.3kV, the electric power of Shanghai is 3.6MW and the electric power of Hunan wind turbine is 3.2kV. The rated voltage of the submarine cable power transmission network is 2.2kV for 6.3kV, and 4.7kV for 3 kV. Through verification, the network voltage is adopted within the range of 25km for auxiliary electric load power of the fan, the line voltage drop is less than 5%, and the electric energy quality requirement of a general distribution network is met.
When the system is operated, the main inlet switches at the 35kV side of the main transformer of the land or offshore transformer substation are disconnected from the power grid, then the sectional switches of the 35kV buses are combined, the diesel generator charges the 35kV buses through the special step-up transformer and the special switch cabinet, the loop switches of the fans are closed to charge the 35kV submarine cables, the submarine cables are operated at a voltage far smaller than the rated voltage of the submarine cables, and the submarine cables are powered by 400V after being reduced by the main transformer of the fans.
The diesel generator, the special switch cabinet, each fan loop switch cabinet, the fan ring main unit and the special medium voltage distribution switch equipment of the fan are all required to be configured with a set of protection, and when the system operates, the protection of the normal power generation working condition of the fan is released.
In summary, the standby power supply system of the offshore wind farm fan has important effects in wind farm construction, fan debugging and operation, typhoon and other extreme climates, can improve the safety and reliability of the fan and the durability of equipment, and has the advantages of good economical efficiency, good practicability and convenient implementation. Therefore, the invention effectively overcomes various defects in the prior art and has high industrial utilization value.
The above embodiments are merely illustrative of the principles of the present invention and its effectiveness, and are not intended to limit the invention. Modifications and variations may be made to the above-described embodiments by those skilled in the art without departing from the spirit and scope of the invention. Accordingly, it is intended that all equivalent modifications and variations of the invention be covered by the claims, which are within the ordinary skill of the art, be within the spirit and scope of the present disclosure.
Claims (6)
1. A standby power supply system of an offshore wind farm fan is characterized by at least comprising a power generation module, a boosting device, a power transmission network, a step-down device and a power distribution switch device,
the power generation module adopts a generator with power not more than 1000KW installed in a land or sea transformer substation;
the boosting equipment adopts a boosting transformer installed in a land or marine transformer substation;
the power transmission network comprises 35kV switch equipment, a 35kV submarine cable network and fan high-voltage side ring network equipment which are used for voltage reduction in a land or marine transformer substation;
the step-down equipment adopts a main transformer when the fan normally operates;
the power distribution switch equipment adopts medium-voltage switch equipment which is parallel to a medium-voltage breaker of a fan stator loop, and the medium-voltage switch equipment is opened when a wind field normally operates and closed when a standby power supply is in a power supply mode; the power transmission network and the voltage reduction equipment are existing 35kV equipment and 35kV power transmission network, and are used for voltage reduction in a standby power supply mode.
2. The backup power system of an offshore wind farm fan of claim 1, wherein the generator is disposed within an onshore wind farm centralized control center or an offshore boost substation.
3. The backup power system of an offshore wind farm fan of claim 2, wherein the generator is a fixedly mounted diesel generator or a mobile emergency power generator car.
4. The backup power supply system of an offshore wind farm fan according to claim 1, wherein the power transmission network is a marine cable collector line network of a fan and a 35kV switch cabinet in normal operation in an offshore wind farm, and a 35kV ring main unit of the fan.
5. A standby power system for a wind farm fan according to any of claims 1-4, wherein the step-up device is a step-up transformer and a 35kV switchgear mounted in a fixed manner, rated voltage ratio of 0.4/2.2kV or 0.4/4.7kV or other transformation ratio.
6. A standby power system for an offshore wind farm fan according to any of claims 1-4, wherein the step-down device is a main transformer of the fan with a rated voltage ratio of 2.2/0.4kV or 4.7/0.4kV or other transformation ratios.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510707612.9A CN106611994B (en) | 2015-10-27 | 2015-10-27 | Standby power supply system of offshore wind field fan |
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| CN201510707612.9A CN106611994B (en) | 2015-10-27 | 2015-10-27 | Standby power supply system of offshore wind field fan |
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| CN106611994A CN106611994A (en) | 2017-05-03 |
| CN106611994B true CN106611994B (en) | 2023-07-07 |
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| CN114188969B (en) * | 2021-07-20 | 2023-07-25 | 江苏方天电力技术有限公司 | Offshore wind power debugging method based on black start |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532224A (en) * | 2013-10-23 | 2014-01-22 | 中国能源建设集团广东省电力设计研究院 | Method for configuring UPS (uninterrupted power supply) in offshore wind plant |
| CN104749453A (en) * | 2013-12-30 | 2015-07-01 | 上海宝钢工业技术服务有限公司 | Method for reducing influences imposed on user voltage sag by external grid single-phase grounding fault |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| US8866334B2 (en) * | 2010-03-02 | 2014-10-21 | Icr Turbine Engine Corporation | Dispatchable power from a renewable energy facility |
| DK2784305T3 (en) * | 2013-03-27 | 2017-01-02 | Alstom Renovables Espana Sl | System for providing electrical power to a wind turbine component |
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103532224A (en) * | 2013-10-23 | 2014-01-22 | 中国能源建设集团广东省电力设计研究院 | Method for configuring UPS (uninterrupted power supply) in offshore wind plant |
| CN104749453A (en) * | 2013-12-30 | 2015-07-01 | 上海宝钢工业技术服务有限公司 | Method for reducing influences imposed on user voltage sag by external grid single-phase grounding fault |
Non-Patent Citations (1)
| Title |
|---|
| 厂用电源与备用电源相位差问题分析探讨;尹承毅,李明强,万奎营,黄承汶;山东煤炭科技(第02期);论文全文 * |
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