CN215601042U - Power utilization system wiring of offshore flexible direct current converter station - Google Patents
Power utilization system wiring of offshore flexible direct current converter station Download PDFInfo
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- CN215601042U CN215601042U CN202023291365.4U CN202023291365U CN215601042U CN 215601042 U CN215601042 U CN 215601042U CN 202023291365 U CN202023291365 U CN 202023291365U CN 215601042 U CN215601042 U CN 215601042U
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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
- 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]
Abstract
The utility model relates to the technical field of offshore wind power flexible direct current transmission engineering, and discloses an offshore flexible direct current converter station power utilization system wiring, which comprises two loops of power inlet wires for a 10kV station, two 10kV working sections, two 400V load centers and a 400V standby power supply, wherein the 10kV working section is connected with the power inlet wires for the 10kV station, the 10kV working section is provided with two outlet wires, the outlet wires are connected with the high-voltage side of a 10/0.4kV dry-type transformer, the 400V load center is provided with two buses, the low voltage of the 10/0.4kV dry-type transformer is connected with the buses through an inlet wire breaker, the quality inspection of the buses is connected with a contact breaker, the 400V standby power supply is provided with standby power outlet wires, and the standby power outlet wires are connected with the buses through the contact breaker. The power utilization system of the offshore flexible direct current converter station is connected, so that the reliability of the power utilization system of the station under the conditions of normal operation, system starting, outage and maintenance and the like of the offshore flexible direct current converter station is ensured.
Description
Technical Field
The utility model relates to the technical field of offshore wind power flexible direct current transmission engineering, in particular to an offshore flexible direct current converter station power utilization system wiring.
Background
The flexible direct current transmission technology is a main technical means for transmitting large-capacity and long-distance offshore wind power, and the offshore flexible direct current converter station is an important facility for offshore wind power flexible direct current transmission engineering. At present, the research and development and design experience of the offshore flexible direct current converter station is not mature in China, and particularly, related research work is less developed aiming at the station power utilization system design of the offshore flexible direct current converter station.
In general, a land-based flexible dc converter station is provided with three power supplies, and in order to improve the reliability of the station power supply, at least one power supply is led from outside the station. Different from the onshore flexible direct current converter station, the offshore distance of the offshore flexible direct current converter station usually exceeds 60km, the arrangement of a special external power supply is difficult, and a diesel generator set is usually adopted as an in-station standby power supply for supplying power to station loads when the offshore flexible direct current converter station is stopped for maintenance.
The offshore booster station usually adopts a diesel generator set as an emergency power supply and is used for supplying power to emergency loads in the station under emergency working conditions. Different from the offshore booster station, in the normal starting process of the offshore flexible direct current transmission system, appropriate environmental conditions need to be provided for the converter valve of the offshore flexible direct current converter station, and the temperature and humidity requirements of the converter valve and the surrounding environment of the converter valve are ensured. In the normal starting process of the offshore flexible direct current transmission system, station power loads of the offshore flexible direct current converter station not only have emergency loads in the station, but also have a large amount of station loads such as a heating ventilation air conditioning system, a water cooling system, control protection and the like for ensuring the normal starting of the offshore flexible direct current transmission system.
To sum up, under the condition that no external power source is provided and a diesel generator set is adopted as a standby power source, in order to improve the reliability of the station power utilization system of the offshore flexible direct current converter station under the conditions of normal operation, system starting, shutdown maintenance and the like, the station power utilization system of the offshore flexible direct current converter station with high reliability, economy and reasonableness is designed, and is an important problem to be solved urgently in design of the station power utilization system of the offshore flexible direct current converter station.
Disclosure of Invention
The utility model aims to provide the connection of the power utilization system of the offshore flexible direct current convertor station aiming at the defects of the technology, so that the reliability of the power utilization system of the offshore flexible direct current convertor station under the conditions of normal operation, system starting, shutdown maintenance and the like is ensured.
In order to achieve the above purpose, the offshore flexible direct current converter station power system wiring according to the present invention includes a first 10kV station power incoming line, a second 10kV station power incoming line, a first 10kV working section, a second 10kV working section, a first 400V load center, a second 400V load center and a 400V standby power supply, wherein the first 10kV working section is connected with the first 10kV station power incoming line, the second 10kV working section is connected with the second 10kV station power incoming line, the first 10kV working section is provided with a first outgoing line and a third outgoing line, the second 10kV working section is provided with a second outgoing line and a fourth outgoing line, the first outgoing line is connected with a high voltage side of a first 10/0.4kV dry-type transformer, the second outgoing line is connected with a high voltage side of a second 10/0.4kV dry-type transformer, the third outgoing line is connected with a high voltage side of a third 10/0.4kV dry-type transformer, the fourth outgoing line is connected with the high-voltage side of a fourth 10/0.4kV dry-type transformer, a first 400V load center is provided with a first bus and a second bus, a second 400V load center is provided with a third bus and a fourth bus, the low-voltage side of the first 10/0.4kV dry-type transformer is connected with the first bus through a first incoming line breaker, the low-voltage side of the second 10/0.4kV dry-type transformer is connected with the second bus through a second incoming line breaker, the low-voltage side of the third 10/0.4kV dry-type transformer is connected with the third bus through a third incoming line breaker, the low-voltage side of the fourth 10/0.4kV dry-type transformer is connected with the fourth bus through a fourth incoming line breaker, the first bus is connected with the second bus through a second and second interconnection breakers, and the second bus is connected with the third bus through a second triple network breaker, the third bus passes through three four tie circuit breakers with the fourth bus is connected, 400V stand-by power supply is equipped with first stand-by power supply and is qualified for the next round of competitions with second stand-by power supply is qualified for the next round of competitions, first stand-by power supply be qualified for the next round of competitions through one be equipped with the tie circuit breaker with first bus is connected, second stand-by power supply be qualified for the next round of competitions through two be equipped with the tie circuit breaker with the second bus is connected.
Preferably, 400V stand-by power supply includes first diesel generating set and second diesel generating set, first diesel generating set and second diesel generating set adopt H type wiring mode to connect, first diesel generating set is equipped with first export circuit breaker, second diesel generating set is equipped with second export circuit breaker, be equipped with stand-by power supply contact circuit breaker between first diesel generating set and the second diesel generating set.
Preferably, the power supply incoming line for the first 10kV station return and the power supply incoming line for the second 10kV station return are led from the 10kV side of the third winding of the transformer or the connecting transformer for the high-voltage station.
Preferably, the first 10/0.4kV dry-type transformer, the second 10/0.4kV dry-type transformer, the third 10/0.4kV dry-type transformer and the fourth 10/0.4kV dry-type transformer are all DYn11 wiring patterns.
Compared with the prior art, the utility model has the following advantages: the reliability of the station power utilization system under the conditions of normal operation, system starting, outage maintenance and the like of the offshore flexible direct current converter station is ensured.
Drawings
Fig. 1 is an electrical schematic diagram of the electrical system wiring of the offshore flexible dc converter station according to the present invention.
The components in the figures are numbered as follows:
the first 10kV station power incoming line 1, the second 10kV station power incoming line 2, the first 10kV working section 3, the second 10kV working section 4, the 400V standby power supply 5, the first outgoing line 31, the second outgoing line 32, the third outgoing line 33, the fourth outgoing line 34, the first incoming line breaker 41, the second incoming line breaker 42, the third incoming line breaker 43, the fourth incoming line breaker 44, the first standby power outgoing line 51, the second standby power outgoing line 52, the first diesel generator set 53, the second diesel generator set 54, the first 10/0.4kV dry-type transformer 61, the second 10/0.4kV dry-type transformer 62, the third 10/0.4kV dry-type transformer 63, the fourth 10/0.4kV dry-type transformer 64, the first bus 71, the second bus 72, the third bus 73, the fourth bus 74, the first standby interconnection breaker 511, the second standby interconnection breaker 521, the fourth interconnection breaker and the like, A first outlet breaker 531, a second outlet breaker 541, a power tie breaker 551, a two-tie breaker 712, a two-three tie breaker 723, and a three-four tie breaker 734.
Detailed Description
The utility model is described in further detail below with reference to the figures and the specific embodiments.
As shown in figure 1, the offshore flexible direct current converter station power system wiring of the utility model comprises a first return 10kV station power incoming line 1, a second return 10kV station power incoming line 2, a first 10kV working section 3, a second 10kV working section 4, a first 400V load center, a second 400V load center and a 400V standby power supply 5, wherein the first 10kV working section 3 is connected with the first return 10kV station power incoming line 1, the second 10kV working section 4 is connected with the second return 10kV station power incoming line 2, the first 10kV working section 3 is provided with a first outgoing line 31 and a third outgoing line 33, the second 10kV working section 4 is provided with a second outgoing line 32 and a fourth outgoing line 34, the first outgoing line 31 is connected with the high-voltage side of a first 10/0.4kV dry type transformer 61, the second outgoing line 32 is connected with the high-voltage side of a second 10/0.4kV dry type transformer 62, the third outgoing line 33 is connected with the high-voltage side of a third 10/0.4kV dry type transformer 63, the fourth outgoing line 34 is connected with the high-voltage side of a fourth 10/0.4kV dry transformer 64, the first 400V load center is provided with a first bus 71 and a second bus 72, the second 400V load center is provided with a third bus 73 and a fourth bus 74, the low-voltage side of the first 10/0.4kV dry transformer 61 is connected with the first bus 71 through a first incoming line breaker 41, the low-voltage side of the second 10/0.4kV dry transformer 62 is connected with the second bus 72 through a second incoming line breaker 42, the low-voltage side of the third 10/0.4kV dry transformer 63 is connected with the third bus 73 through a third incoming line breaker 43, the low-voltage side of the fourth 10/0.4kV dry transformer 64 is connected with the fourth bus 74 through a fourth incoming line breaker 44, the first bus 71 is connected with the second bus 72 through a second interconnection breaker 712, the second bus 72 is connected with the third bus 73 through a third triple network breaker 723, the third bus 73 is connected with the fourth bus 74 through a three-four connection breaker 734, the 400V standby power supply 5 is provided with a first standby power supply outlet 51 and a second standby power supply outlet 52, the first standby power supply outlet 51 is connected with the first bus 71 through a standby connection breaker 511, and the second standby power supply outlet 52 is connected with the second bus 72 through a second standby connection breaker 521.
Wherein, 400V stand-by power supply 5 includes first diesel generating set 53 and second diesel generating set 54, and first diesel generating set 53 and second diesel generating set 54 adopt the H type mode of connection to connect, and first diesel generating set 53 is equipped with first export circuit breaker 531, and second diesel generating set 54 is equipped with second export circuit breaker 541, is equipped with stand-by power supply contact circuit breaker 551 between first diesel generating set 53 and the second diesel generating set 54.
Through the first diesel generating set 53 and the second diesel generating set 54, the reliability of the standby power supply of the offshore flexible direct current converter station is improved, and the standby power supply is used for supplying power to the station load in the system starting process and the long-time power failure maintenance working condition. The diesel generating set can be operated for a long time by a single set under the condition that the load is lower than 70% of the basic power (PRP), can be operated for a non-long time by a single set under the condition that the load is greater than 70% of the basic power (PRP), and can also be operated for a long time by selecting two sets in parallel under the condition that the load is greater than 70% of the basic power (PRP).
In the embodiment, the power inlet wire 1 for the first 10kV station and the power inlet wire 2 for the second 10kV station are led from the 10kV side of the third winding of the transformer or the connecting transformer for the high-voltage station,
in this embodiment, the first 10/0.4kV dry-type transformer 61, the second 10/0.4kV dry-type transformer 62, the third 10/0.4kV dry-type transformer 63, and the fourth 10/0.4kV dry-type transformer 64 are DYn11 wiring patterns.
In this embodiment, because the offshore flexible direct current converter station has a high requirement on an indoor environment and a large heat productivity of equipment, and the station power load is usually large, two 400V load centers, namely a first 400V load center and a second 400V load center, are provided to supply power to the station power load of the total station. And the two sections of buses passing through each 400V load center are mutually standby.
When the power utilization system of the offshore flexible direct current converter station is in wiring operation, the working conditions comprise that:
A) and (3) during normal operation: a first incoming line breaker 41, a second incoming line breaker 42, a third incoming line breaker 43 and a fourth incoming line breaker 44 are switched on, a second and third interconnection breaker 712, a second and third interconnection breaker 723, a third and fourth interconnection breaker 734, a first standby interconnection breaker 511 and a second standby interconnection breaker 521 are switched off, and the 400V standby power supply 5 is not started;
B) any one 10/0.4kV dry-type transformer loses power, and the other three 10/0.4kV dry-type transformers are normal: the interconnection breaker between two buses on the load center corresponding to the 10/0.4kV dry-type transformer losing the power supply is switched on, the interconnection breaker on the outgoing line of the 10/0.4kV dry-type transformer losing the power supply is switched off, and the 400V standby power supply 5 is not started;
for example, the second 10/0.4kV dry transformer 62 loses power, and the other 10/0.4kV dry transformers operate normally. Then the first and second interconnection breakers 712 are switched on, the second incoming line breaker 42 is switched off, all loads of the first 10/0.4kV dry-type transformer 61 with the first 400V load center run, and the 400V standby power supply 5 is not started;
C) two 10/0.4kV dry-type transformers lose power:
C1) two 10/0.4kV dry-type transformers in different load centers lose power: the interconnection breaker between two buses on the load center corresponding to the 10/0.4kV dry-type transformer losing the power supply is switched on, the interconnection breaker on the outgoing line of the 10/0.4kV dry-type transformer losing the power supply is switched off, and the 400V standby power supply 4 is not started;
for example, the first 10/0.4kV dry-type transformer 61 and the third 10/0.4kV dry-type transformer 63 are de-energized, and the second 10/0.4kV dry-type transformer 62 and the fourth 10/0.4kV dry-type transformer 64 are operating normally. Then the two-in-one connection breaker 712 is switched on, the first incoming line breaker 41 is switched off, the two-out-of-three connection breaker 723 is switched on, the third incoming line breaker 43 is switched off, all the loads of the first 400V load center are carried by the second 10/0.4kV dry-type transformer 62 to operate, all the loads of the second 400V load center are carried by the fourth 10/0.4kV dry-type transformer 64 to operate, and the 400V standby power supply 4 is not started;
C2) two 10/0.4kV dry-type transformers in the same load center lose power: the two-circuit 10kV station is quitted from running by the power supply incoming line, the 400V standby power supply 5 is started, the first incoming line breaker 41, the second incoming line breaker 42, the third incoming line breaker 43 and the fourth incoming line breaker 44 are switched off, the first two-contact breaker 712, the second three-contact breaker 723 and the third four-contact breaker 734 are switched on, and the first standby contact breaker 511 or the second standby contact breaker 521 are switched on;
for example, if the first 10/0.4kV dry-type transformer 61 and the second 10/0.4kV dry-type transformer 62 lose power, the first 400V load center loses power as a whole, the second 400V load center is normal, because the second 400V load center can not carry the electric load of the total station to operate, the first incoming line breaker 41, the second incoming line breaker 42, the third incoming line breaker 43 and the fourth incoming line breaker 44 are opened and closed, the second tie breaker 712, the second tie breaker 723 and the third tie breaker 734 are closed, the first bus 71 and the second bus 72 of the first 400V load center are connected with the third bus 73 and the fourth bus 74 of the second 400V load center into a whole, the 400V standby power supply 5 is started, and the power system of the 400V station is switched on through the first backup contact breaker 511 or the second backup contact breaker 521, and the whole station enters a standby power supply operation state.
D) Any 3 10/0.4kV dry-type transformers lose power or 4 10/0.4kV dry-type transformers lose power: the two-circuit 10kV station power supply inlet wire quits operation, the 400V standby power supply 5 is started, the first inlet wire breaker 41, the second inlet wire breaker 42, the third inlet wire breaker 43 and the fourth inlet wire breaker 44 are switched off, the two-in-line and two-out-of-line breaker 712, the two-in-line and three-out-of-line and three-in-four-in-line breaker 723 and the one-in-line and two-out-of-line breaker 511 or the two-in-line and two-out-of-line breaker 521 are switched on.
In addition, when the embodiment is operated, the total station loads are uniformly accessed to the first 400V load center and the second 400V load center according to the region and the function. The station electric loads of a fire fighting system, emergency lighting, accident ventilation, a fire fighting broadcasting system, communication equipment, escape equipment and navigation equipment required in an emergency state are connected to a first 400V load center.
The power utilization system of the offshore flexible direct current converter station is connected, so that the reliability of the power utilization system of the station under the conditions of normal operation, system starting, outage and maintenance and the like of the offshore flexible direct current converter station is ensured.
Claims (4)
1. The utility model provides an offshore flexible direct current converter station power consumption system wiring which characterized in that: the transformer comprises a first 10kV station power inlet wire (1), a second 10kV station power inlet wire (2), a first 10kV working section (3), a second 10kV working section (4), a first 400V load center, a second 400V load center and a 400V standby power supply (5), wherein the first 10kV working section (3) is connected with the first 10kV station power inlet wire (1), the second 10kV working section (4) is connected with the second 10kV station power inlet wire (2), the first 10kV working section (3) is provided with a first outlet wire (31) and a third outlet wire (33), the second 10kV working section (4) is provided with a second outlet wire (32) and a fourth outlet wire (34), the first outlet wire (31) is connected with the high-voltage side of a first 10/0.4kV dry-type transformer (61), and the second outlet wire (32) is connected with the high-voltage side of a second 10/0.4kV dry-type transformer (62), the third outgoing line (33) is connected with the high-voltage side of a third 10/0.4kV dry-type transformer (63), the fourth outgoing line (34) is connected with the high-voltage side of a fourth 10/0.4kV dry-type transformer (64), a first 400V load center is provided with a first bus (71) and a second bus (72), a second 400V load center is provided with a third bus (73) and a fourth bus (74), the low-voltage side of the first 10/0.4kV dry-type transformer (61) is connected with the first bus (71) through a first incoming line breaker (41), the low-voltage side of the second 10/0.4kV dry-type transformer (62) is connected with the second bus (72) through a second incoming line breaker (42), and the low-voltage side of the third 10/0.4kV dry-type transformer (63) is connected with the third bus (73) through a third incoming line breaker (43), the low voltage side of the fourth 10/0.4kV dry transformer (64) is connected to the fourth busbar (74) via a fourth incoming breaker (44), the first bus bar (71) is connected to the second bus bar (72) by a two-way circuit breaker (712), the second busbar (72) is connected to the third busbar (73) by a triple junction breaker (723), the third busbar (73) is connected to the fourth busbar (74) by a three-four contact breaker (734), the 400V standby power supply (5) is provided with a first standby power supply outlet (51) and a second standby power supply outlet (52), the first backup power outlet (51) is connected to the first bus bar (71) via a backup interconnection breaker (511), the second backup power outlet (52) is connected to the second bus (72) via a second backup interconnection breaker (521).
2. The offshore flexible direct current converter station power utilization system connection according to claim 1, characterized in that: the 400V standby power supply (5) comprises a first diesel generator set (53) and a second diesel generator set (54), the first diesel generator set (53) and the second diesel generator set (54) are connected in an H-shaped wiring mode, the first diesel generator set (53) is provided with a first outlet circuit breaker (531), the second diesel generator set (54) is provided with a second outlet circuit breaker (541), and a standby power supply connection circuit breaker (551) is arranged between the first diesel generator set (53) and the second diesel generator set (54).
3. The offshore flexible direct current converter station power utilization system connection according to claim 1, characterized in that: and the power supply inlet wire (1) for the first 10kV station and the power supply inlet wire (2) for the second 10kV station are both led from the 10kV side of the third winding of the transformer or the connecting transformer for the high-voltage station.
4. The offshore flexible direct current converter station power utilization system connection according to claim 1, characterized in that: the first 10/0.4kV dry-type transformer (61), the second 10/0.4kV dry-type transformer (62), the third 10/0.4kV dry-type transformer (63) and the fourth 10/0.4kV dry-type transformer (64) are in DYn11 wiring type.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023291365.4U CN215601042U (en) | 2020-12-31 | 2020-12-31 | Power utilization system wiring of offshore flexible direct current converter station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202023291365.4U CN215601042U (en) | 2020-12-31 | 2020-12-31 | Power utilization system wiring of offshore flexible direct current converter station |
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| Publication Number | Publication Date |
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| CN215601042U true CN215601042U (en) | 2022-01-21 |
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| CN202023291365.4U Active CN215601042U (en) | 2020-12-31 | 2020-12-31 | Power utilization system wiring of offshore flexible direct current converter station |
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| CN (1) | CN215601042U (en) |
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