CN114094616A - High-voltage debugging power supply method for offshore flexible direct current converter station - Google Patents
High-voltage debugging power supply method for offshore flexible direct current converter station Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/36—Arrangements for transfer of electric power between ac networks via a high-tension dc link
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03D—WIND MOTORS
- F03D9/00—Adaptations of wind motors for special use; Combinations of wind motors with apparatus driven thereby; Wind motors specially adapted for installation in particular locations
- F03D9/20—Wind motors characterised by the driven apparatus
- F03D9/25—Wind motors characterised by the driven apparatus the apparatus being an electrical generator
- F03D9/255—Wind motors characterised by the driven apparatus the apparatus being an electrical generator connected to electrical distribution networks; Arrangements therefor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- 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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- 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
- Y02E10/70—Wind energy
- Y02E10/72—Wind turbines with rotation axis in wind direction
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/60—Arrangements for transfer of electric power between AC networks or generators via a high voltage DC link [HVCD]
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Abstract
The invention relates to a high-voltage debugging method for an offshore flexible direct current converter station, which comprises the following steps of: s1: preparing materials; s2: installing a box transformer substation; s3: preparing a cable; s4: arranging a wire inlet hole; s5: electrically connecting; s6: debugging in batches; s7: and finishing debugging. The arrangement of the cables is optimized by moving the box transformer position to the bottom of the converter station, and under the condition that the total power of the high-voltage power supply is unchanged, the voltage is increased, the current is reduced, the using quantity of the cables is reduced, the procurement cost is reduced, the material cost of the procured cables is reduced, and dangerous phenomena such as cable heating caused by large current are reduced, so that the project construction efficiency is improved, the construction is convenient, and the economic benefit is obvious; the transformer withstand voltage test for the converter station uses a high-voltage power supply, the transformer power supply of the mobile box is changed, the transformer power supply of the original box is used, the purchase of a new box transformer power supply box is reduced, and the construction is convenient; the access of a high-voltage power supply is optimized, on the premise of the same power, the voltage is increased, the current is reduced, and the using number of cables is reduced; the safety is ensured.
Description
Technical Field
The invention relates to the field of offshore wind power structures, in particular to a method for debugging a power supply of an offshore flexible direct current converter station at high voltage.
Background
The offshore flexible direct current converter station is located in the sea area of yellow sand at the east of east county, is arranged in the middle of the sea area between an H6 field and an H10 field of an 800MW offshore wind power project, and has a linear distance of about 70km from the shore and a station site water depth of about 17 m. The upper module is a six-storey building, and a valve hall, a seawater pump room, a fire-fighting equipment room, a seawater desalination room and the like are arranged on one storey; the upper part of a valve hall, a valve cooling room, a fresh water circulation equipment room, a valve hall heating and ventilation machine room and the like are arranged in two layers; the system comprises a valve hall, a valve hall heating and ventilating machine room, a fresh air machine room, a diesel machine room, a station room, a storage battery room and the like which are arranged in three layers; an accident oil pool, a direct current field, a cable chamber, a secondary equipment chamber, an air-conditioning refrigeration machine room and the like are arranged in four layers; a 220kVGIS chamber, a 550kVSIG chamber, a direct current field overhead, a connecting transformer chamber, a fresh air machine room and the like are arranged in five layers; the six layers are arranged above a 220kVGIS chamber, a coupling variable chamber, a 550kVGIS chamber and a direct current field; the roof layer of the platform is provided with a foam fire-fighting room, an equipment hoisting access hole, a crane, a helicopter platform and the like.
The project of the three gorges converter station is the largest power transmission and transformation project of the buildingheavy equipment, and the volume of the project is equivalent to the sum of the capacities of 10 220KW booster stations. The debugging power supply requirement of the project is the largest power load requirement in the project of the Zhenhua reinstallation and construction, no earlier project can be used for reference, the required high-voltage load capacity is equivalent to the configuration required by a normal factory, and the switch capacity requirement is at least 4000A. According to normal power distribution requirements, the power plant cannot meet the requirement that all loads are used simultaneously.
The design scheme is that the cables required for supplying power to a wharf 32# box transformer substation (with the total capacity of 2000 KVA) are as follows: 156 cables of 1X240mm2YJV/SC-0.6/1 and 302 m/cable are required to be prepared for connecting a power supply from a No. 32 box transformer substation, and 52 cables of 1X120mm2YJV/SC-0.6/1 and 302 m/cable are required to be prepared; it is expected that a total of 208 cables of about 6.28 ten thousand meters (4.71 ten thousand meters for 1X240mm2YJV/SC-0.6/1 cable and 1.57 ten thousand meters for 1X120mm2YJV/SC-0.6/1 cable) are required by verification with the site, and the cable usage is equivalent to the sum of 6 crane cables of 1000T size. The number of cables is large, the cost is high, and the cables cannot be laid under field conditions.
In addition, the equipment such as 220kVGIS, 550kVSIG, high-voltage connection transformer, transformer for high-voltage station and the like can be used for debugging more dangerous factors at the same time, other professional construction needs to be suspended, the progress of the whole converter station is related, and the field construction difficulty is very high.
Disclosure of Invention
The technical problem to be solved by the invention is to provide a method for debugging a power supply of an offshore flexible direct current converter station at high voltage, and solve the problems that the prior art can not meet the requirement of debugging the power supply, the number of cables required by box transformer substation power supply is large, the cost is high, so many cables can not be laid under field conditions, the debugging is dangerous, and the field construction difficulty is great.
In order to solve the technical problems, the technical scheme of the invention is as follows: a high-voltage debugging power supply method for an offshore flexible direct-current convertor station comprises a convertor station, a ring network high-voltage cabinet, a box transformer substation and a cable, and is characterized in that:
the converter station comprises a top layer, a first layer, a second layer, a third layer, a fourth layer, a fifth layer and a sixth layer which are sequentially arranged from top to bottom, wherein a station room is arranged on the third layer, a normal power distribution cabinet and a power supply switch of the station room are installed in the station room, and a wire inlet hole communicated with the interior of the station room is formed in the third layer of the converter station;
the box transformer substation is arranged at the bottom of the converter station and is positioned right below the station chamber;
the cable is a three-phase cable and comprises a power wiring cable and a grounding cable;
the method for debugging the power supply at high voltage of the converter station comprises the following steps:
s1: preparing materials: preparing a power wiring cable, a grounding cable, a box transformer substation, a ring network high-voltage cabinet and a cable bridge;
s2: installing a box transformer substation: arranging a box transformer substation at the bottom of a converter station and right below the station chamber;
s3: preparing a cable: in order to reduce electromagnetic interference, the power connection cable and the grounding cable are laid and bound in a delta shape, and are arranged in an overhead mode by using a cable bridge frame to prevent blocking of a field channel;
s4: arranging a wire inlet hole;
s5: electrical connection: connecting the ring network high-voltage cabinet with a box transformer substation, and penetrating the box transformer substation into the station room through a power wiring cable and a grounding cable to be connected to the inlet end of a power supply switch;
s6: debugging in batches: debugging a station room, and then moving the box transformer substation to debug other completed structures of the converter station one by one in batches according to the real-time construction progress of the site until all the structures of the converter station are completed and the debugging is finished, and stopping the debugging, so as to ensure that a single box transformer substation can meet the requirements;
s7: and finishing debugging.
Further, when the power wiring cables or the grounding cables in the S2 are laid and bound, iron wires are bound and fixed at intervals of 1m, and the power wiring cables or the grounding cables are turned over once at intervals of 15-20 m in a crossed mode, so that the stability of the cable structure is guaranteed.
Further, the high-voltage danger warning sign hangs along the cable, and irrelevant personnel forbid the operation, and adopt three proofings cloth to cover when the on-the-spot welding operation around the cable laying, pay attention to the protection, avoid causing the incident.
Furthermore, 1100mm around the box transformer substation is provided with a wire netting fence for safety protection.
Further, in order to guarantee the continuous working state of the subsequent air conditioners in the valve hall, the 4 air conditioners in the valve hall 1 and the valve hall 2 also need to ensure independent power supply and are connected from a 380V power box on site, and the air conditioners are specifically arranged according to a scheme of designing a debugging power supply of the air conditioners in the inline single valve hall.
The invention has the advantages that:
1) according to the converter station, the arrangement of cables is optimized by moving the box transformer position to the bottom of the converter station, and under the condition that the total power of a high-voltage power supply is unchanged, the voltage is increased, the current is reduced, the using quantity of the cables is reduced, the procurement cost of cable materials is reduced, and dangerous phenomena such as cable heating caused by large current are reduced, so that the project construction efficiency is improved, the construction is convenient, and the economic benefit is obvious;
2) according to the transformer voltage withstand test for the converter station, a high-voltage power supply is used, a box transformer power supply is moved, an original box transformer power supply is used, the procurement of a new box transformer power supply box is reduced, and the construction is convenient; the access of a high-voltage power supply is optimized, on the premise of the same power, the voltage is increased, the current is reduced, and the using number of cables is reduced;
3) the invention optimizes load configuration, finishes the room test of the convertor station in advance, ensures that the room of the convertor station is used in advance, ensures that the debugging parameters of the equipment of the total station are accurate, finishes the debugging work in advance within 30 days, shortens the construction period of the whole project, ensures the safety and ensures that each professional at the later stage intervenes in advance.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
Fig. 1 is a schematic diagram of the distribution of the converter station cables in the method for debugging the power supply at high voltage in the offshore flexible direct current converter station.
Fig. 2 is a schematic diagram of station room cable connection of the method for debugging a power supply at high voltage in the offshore flexible direct current converter station.
Fig. 3 is a schematic diagram of distribution of station cables of the method for debugging a power supply at high voltage in the offshore flexible direct current converter station.
Fig. 4 is an electrical connection schematic diagram of a high-voltage debugging power supply method of an offshore flexible direct current converter station according to the invention.
Fig. 5 is an electrical schematic diagram of a method for debugging a power supply at high voltage in an offshore flexible direct current converter station according to the present invention.
Fig. 6 is a schematic diagram of an installation of a valve hall air conditioner in the method for debugging the power supply at high voltage in the marine flexible direct current converter station.
Detailed Description
As shown in fig. 1 to 6, the method for debugging the power supply at high voltage for the offshore flexible direct current converter station includes a converter station 1, a ring network high voltage cabinet, a box transformer substation 2 and a cable 3.
The converter station 1 comprises a top layer, a first layer, a second layer, a third layer, a fourth layer, a fifth layer and a sixth layer which are sequentially arranged from top to bottom, wherein a station room 7 is arranged on a third layer 6, a station room normal power distribution cabinet and a power supply switch 4 are installed in the station room 7, and a wire inlet hole 8 communicated with the interior of the station room is formed in the third layer of the converter station 1.
The box transformer 2 is arranged at the bottom of the converter station 1 directly below the station room.
The cable 3 is a three-phase cable, including a power connection cable and a grounding cable.
The high-voltage debugging power supply method for the converter station 1 comprises the following steps:
s1: preparing materials: preparing 27 cables with the length of 70m and the length of 1X240mm2YJV/SC-0.6/1 as power connection cables and 9 cables with the length of 70m and the length of 1X120mm2YJV/SC-0.6/1 as grounding cables, a box transformer 2, a ring network high-voltage cabinet and a cable bridge 5.
S2: installing a box transformer substation 2: set up the case and become 2 and be located station with room under the bottom of converter station 1, the iron wire netting rail 9 has been arranged to 1100mm department all around of case and become 2 for safety protection.
S3: preparation of the cable 3: in order to reduce electromagnetic interference, the power wiring cables and the grounding cables are laid and bound in a delta shape, when the power wiring cables and the grounding cables are laid and bound, iron wires are used for binding and fixing every 1m, the power wiring cables or the grounding cables are alternately turned over once every 15m, the structural stability of the cables 3 is guaranteed, and the cables are arranged in an overhead mode through a cable bridge 5 and used for preventing blocking of field channels.
Hang high-pressure dangerous warning sign along the line of cable 3, irrelevant personnel forbid the operation, and adopt three proofings cloth to cover when the field welding operation around cable 3 lays, notice the protection, avoid causing the incident.
S4: a wire inlet hole 8 is arranged.
S5: electrical connection: the secondary side rated current I = P/U/1.732=2000/0.4/1.732=2886.84A of the 2000KVA transformer, the ring network high-voltage cabinet is connected with the box transformer 2, the box transformer 2 is connected with the inlet end of the power supply switch 4 through a power connection cable and a grounding cable penetrating into a station for indoor connection, phase sequence detection and insulation inspection are required before power is conducted, power can be conducted if the requirement is met, and power can be conducted if the fault is not required to be eliminated.
S6: debugging in batches: debugging the station room, and then moving the box transformer substation 2 to debug other completed structures of the converter station 1 one by one in batches according to the on-site real-time construction progress until all the structures of the converter station 1 are completed and the debugging is finished, so that the single box transformer substation 2 is ensured to meet the requirements.
S7: and finishing debugging.
Benefit promotion and value contribution:
1. the access of a high-voltage power supply is optimized, and on the premise of the same power, the cost of the cable material for purchasing the cable is reduced: 32100 × 148+10700 × 77=557.47 ten thousand dollars (according to the current market price 1 × 240 cables 148 dollars/meter, 1 × 120 cables 77 dollars/meter, stock tooling cables 1 × 240 have 1.5 kilometers, 1 × 120 cables have around 5 kilometers).
2. The transformer withstand voltage test for the converter station uses a high-voltage power supply, the position of the box transformer power supply is moved, the original box transformer is used, and the cost of purchasing a new box transformer power supply box is reduced by 80 ten thousand yuan.
3. The load configuration is optimized, the converter station room is used in advance, the debugging work is completed within 30 days in advance, the construction period is shortened, and each professional in the later period is involved in advance. Avoiding delayed delivery of fines (90 ten thousand dollars/day).
The cost of direct production and the like is reduced by about 3337.47 ten thousand yuan.
It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (5)
1. A high-voltage debugging power supply method for an offshore flexible direct current converter station comprises the converter station, a ring network high-voltage cabinet, a box transformer substation and a cable, and is characterized in that:
the converter station comprises a top layer, a first layer, a second layer, a third layer, a fourth layer, a fifth layer and a sixth layer which are sequentially arranged from top to bottom, wherein a station room is arranged on the third layer, a normal power distribution cabinet and a power supply switch of the station room are installed in the station room, and a wire inlet hole communicated with the interior of the station room is formed in the third layer of the converter station;
the box transformer substation is arranged at the bottom of the converter station and is positioned right below the station chamber;
the cable is a three-phase cable and comprises a power wiring cable and a grounding cable;
the method for debugging the power supply at high voltage in the converter station comprises the following steps:
s1: preparing materials: preparing a power wiring cable, a grounding cable, a box transformer substation, a ring network high-voltage cabinet and a cable bridge;
s2: installing a box transformer substation: arranging a box transformer substation at the bottom of a converter station and right below the station chamber;
s3: preparing a cable: the power connection cable and the grounding cable are laid and bound in a delta shape, and are arranged in an overhead mode through a cable bridge;
s4: arranging a wire inlet hole;
s5: electrical connection: connecting the ring network high-voltage cabinet with a box transformer substation, and penetrating the box transformer substation into the station room through a power wiring cable and a grounding cable to be connected to the inlet end of a power supply switch;
s6: debugging in batches: debugging the station room, and then moving the box transformer substation to debug other completed structures of the converter station one by one in batches according to the real-time construction progress of the site until all the structures of the converter station are completed and the debugging is finished, and then stopping;
s7: and finishing debugging.
2. The high-voltage debugging power supply method for the offshore flexible direct current converter station according to claim 1, characterized by comprising the following steps: when the power wiring cables or the grounding cables in the S2 are laid and bound, iron wires are bound and fixed at intervals of 1m, and the power wiring cables or the grounding cables are turned over once at intervals of 15-20 m.
3. The high-voltage debugging power supply method for the offshore flexible direct current converter station according to claim 1 or 2, characterized by comprising the following steps: the high-voltage danger warning board is hung along the cable, no personnel forbid operation, and three-proofing cloth is adopted to cover around the cable laying when the on-site welding operation.
4. The high-voltage debugging power supply method for the offshore flexible direct current converter station according to claim 1, characterized by comprising the following steps: and an iron wire net fence is arranged at 1100mm of the periphery of the box transformer substation.
5. The high-voltage debugging power supply method for the offshore flexible direct-current converter station according to claim 1, characterized by comprising the following steps: in order to ensure the continuous working state of the air conditioners in the subsequent valve hall, the 4 air conditioners in the valve hall 1 and the valve hall 2 also need to ensure independent power supply, are connected from a 380V power box on site, and are specifically arranged according to a scheme of designing debugging power supplies of the air conditioners in the inline single valve hall.
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| CN114604378A (en) * | 2022-03-17 | 2022-06-10 | 中国能源建设集团广东省电力设计研究院有限公司 | Valve hall structure system of offshore converter station |
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| CN109066686A (en) * | 2018-08-08 | 2018-12-21 | 中国科学院电工研究所 | A kind of flexible switch station interconnection architecture with the comprehensive distribution of a variety of electric energy |
| CN111426910A (en) * | 2020-04-03 | 2020-07-17 | 南京南瑞继保电气有限公司 | Testing system and testing method for flexible direct current transmission converter station |
| CN111799661A (en) * | 2020-06-04 | 2020-10-20 | 许继集团有限公司 | Converter station of modular offshore flexible direct current transmission system |
| CN112510745A (en) * | 2020-09-16 | 2021-03-16 | 中国电建集团华东勘测设计研究院有限公司 | Flexible direct current offshore converter station with 66kV current collection line access |
| CN112421670A (en) * | 2020-12-09 | 2021-02-26 | 浙江大学 | Intermediate-frequency flexible direct-current power transmission system suitable for sending out wind power from open sea and control method thereof |
| CN113612248A (en) * | 2021-08-26 | 2021-11-05 | 特变电工西安柔性输配电有限公司 | Compact and light marine flexible direct current converter station |
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| CN114604378A (en) * | 2022-03-17 | 2022-06-10 | 中国能源建设集团广东省电力设计研究院有限公司 | Valve hall structure system of offshore converter station |
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