CN110994623B - 10KV superconducting closed loop operation method - Google Patents
10KV superconducting closed loop operation method Download PDFInfo
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- CN110994623B CN110994623B CN201911362547.5A CN201911362547A CN110994623B CN 110994623 B CN110994623 B CN 110994623B CN 201911362547 A CN201911362547 A CN 201911362547A CN 110994623 B CN110994623 B CN 110994623B
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- 238000000034 method Methods 0.000 title claims abstract description 26
- 239000013307 optical fiber Substances 0.000 claims description 3
- 230000036316 preload Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 7
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000004134 energy conservation Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000005057 refrigeration Methods 0.000 description 1
Classifications
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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
- H02J3/04—Circuit arrangements for ac mains or ac distribution networks for connecting networks of the same frequency but supplied from different sources
- H02J3/06—Controlling transfer of power between connected networks; Controlling sharing of load between connected networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/22—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Emergency Protection Circuit Devices (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a 10kV superconducting closed loop operation method, which comprises the following steps: step S1, measuring a 10kV superconducting cable current limiting value according to N-1 guide rule requirements of ring network operation, and judging whether cable tide meets power safety and stability guide rule requirements or not; s2, judging the short-circuit current level of a 110kV line and a 110kV line bus of the loop closing operation system; s3, configuring 110kV lines and 10kV superconducting cable protection in the related looped network; and S4, detecting and configuring a standby automatic switching device of a related disconnection point 110kV line and a 10kV superconducting cable bus. By implementing the invention, the power supply reliability is improved, N-1 is satisfied in the ring, and the load safety is ensured; double-loop power supply is formed, and power failure of a user caused by single power failure is avoided.
Description
Technical Field
The invention belongs to the technical field of superconduction, and relates to a 10kV superconduction closed loop operation method.
Background
The superconducting cable has the advantages of large capacity, low loss, energy conservation, environmental protection and the like, so that the superconducting cable has good application prospect in improving the transmission capacity of a power grid, upgrading the existing power system and constructing a new power system, and has a certain clear advantage compared with the conventional cable.
At present, the superconducting cable is still in an immature stage, is influenced by problems of superconducting tapes, cable installation technology, refrigeration and the like, has poor power supply reliability, and still has the risk of voltage loss of a user caused by fault tripping.
The traditional 10kV superconducting cable is the same as a conventional cable, and generally adopts an open-loop operation mode. The 10kV superconducting cable and the 110kV line are mutually standby, so that the problem of reliability reduction caused by the split operation of the 110kV transformer substation is solved. In order to reduce the total station voltage loss risk, 110kV transformer substations generally adopt split operation, 2 main transformers and 1 main transformer are respectively supplied by two 110kV lines, 10kV spare power automatic switching is utilized to support each other in a low-voltage mode, but correspondingly, the risk that the voltage loss of a 2-section 10kV bus is caused by the 110kV line faults of the two main transformers is also present, and the power supply reliability is reduced.
Disclosure of Invention
The technical problem to be solved by the embodiment of the invention is to provide a 10kV superconducting closed loop running method, which solves the problems that the 10kV superconducting cable and a 110kV line electromagnetic ring network have low running reliability and poor load safety, and one line fault can cause the other line fault.
The invention provides a 10kV superconducting closed loop operation method, which comprises the following steps:
Step S1, measuring a 10kV superconducting cable current limiting value according to N-1 guide rule requirements of ring network operation, and judging whether cable tide meets power safety and stability guide rule requirements or not;
s2, judging the short-circuit current level of a 110kV line and a 110kV line bus of the loop closing operation system;
S3, configuring 110kV lines and 10kV superconducting cable protection in the related looped network;
And S4, detecting and configuring a standby automatic switching device of a related disconnection point 110kV line and a10 kV superconducting cable bus.
Further, in step S1, the specific process required for determining whether the cable power flow meets the power safety and stability guidelines is to determine that the power flow of the 110 line and the 10kV superconducting cable is smaller than the maximum flowing power limit of the superconducting cable body, for example, the current superconducting section limit, and a load-turning measure needs to be adopted in advance.
Further, in step S2, the specific process of determining the short-circuit current level of the 110kV line and the 110kV line bus of the loop closing operation system is to check the short-circuit current of the 110kV line during the loop closing operation, determine whether the short-circuit current level is not greater than the maximum interruption capacity of the switch, and if the short-circuit current is greater than the maximum interruption capacity of the switch, install the 10kV current limiting reactor.
Further, in step S3, the protection configuration of the 110kV line and the 10kV superconducting cable in the related ring network specifically includes that the 110kV line and the 10kV superconducting cable are configured with a doubled optical fiber differential protection, the B station is configured with a doubled 110kV differential protection, and the a station 10kV 3m, the B station 10kV 3m and the B station 10kV 4m are configured with a doubled 10kV differential protection.
Further, in step S3, the 110kV line and 10kV superconducting cable protection configuration in the related ring network specifically includes a backup protection configuration distance, overcurrent and direction protection of the 10kV superconducting cable.
Further, in step S3, the protection configuration of the 110kV line and the 10kV superconducting cable in the relevant ring network specifically includes that the a station 10kV 3m, the B station 10kV 3m, and the B station 10kV 4m feeder line configure conventional overcurrent and zero sequence protection and configure distance protection.
Further, in step S4, the specific process of the automatic backup power switching device for detecting and configuring the relevant disconnection point 110kV line and the 10kV superconducting cable bus is to detect whether the 10kV automatic backup power switching of the B station and the 10kV automatic backup power switching of the a station meet the 10kV 4m operation requirement, and if not, upgrade and update are performed.
Further, the 10kV superconducting cable impedance is 10% of the conventional cable impedance.
The embodiment of the invention has the following beneficial effects:
The embodiment of the invention provides a 10kV superconducting closed loop running method, which adopts electromagnetic looped network running, improves the power supply reliability, satisfies N-1 in the loop and ensures the load safety; the power supply reliability of the 110kV transformer substation is improved, the power supply safety of a central area is guaranteed, double-loop power supply is formed, and power failure of a user caused by single power failure is avoided.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions of the prior art, the drawings which are required in the description of the embodiments or the prior art will be briefly described, it being obvious that the drawings in the description below are only some embodiments of the invention, and that it is within the scope of the invention to one skilled in the art to obtain other drawings from these drawings without inventive faculty.
Fig. 1 is a schematic diagram of a main flow of an embodiment of a 10kV superconducting closed loop operation method provided by the invention.
Fig. 2 is a schematic diagram of superconducting loop closing operation of a medium-low voltage distribution network according to an embodiment of the 10kV superconducting loop closing operation method provided by the invention.
Fig. 3 is a schematic diagram of a closed loop operation mode tide of an embodiment of the 10kV superconducting closed loop operation method provided by the invention.
Fig. 4 is a schematic diagram of a calculation result of an outlet short-circuit current of a station a 10kV 3m or a 10kV line connected thereto according to an embodiment of the 10kV superconducting closed loop operation method provided by the present invention.
Fig. 5 is a schematic diagram of a calculation result of an outlet short-circuit current of a 10kV 3m station B or a 10kV line connected thereto according to an embodiment of the 10kV superconducting closed loop operation method provided by the present invention.
Fig. 6 is a schematic diagram of a power grid protection configuration suitable for the current carrying capacity of a superconducting cable according to an embodiment of the 10kV superconducting closed loop operation method provided by the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings, for the purpose of making the objects, technical solutions and advantages of the present invention more apparent.
As shown in fig. 2, the superconducting loop operation mode of the medium-low voltage distribution network is provided. In addition to the conventional power supply from a 220kV A transformer substation to a 110kV B transformer substation, a 10kV#4 bus is extended at the 110kV B transformer substation, a 10kV high-temperature superconducting alternating current cable line with the length of about 430m is newly built, the 10kV#3 bus of the 220kV A transformer substation and the 10kV#4 bus of the 110kV B transformer substation are connected, the transmission capacity of the newly built line is considered according to 43MVA, the 10kV superconducting cable and the 110kV line electromagnetic looped network operate, and 4 aspects such as tide, short-circuit current, relay protection, automatic backup switching and the like are required to be met for maintaining the operation of the electromagnetic looped network.
As shown in fig. 1, a schematic diagram of a main flow of an embodiment of a 10kV superconducting closed loop operation method provided by the present invention is shown, and in this embodiment, the method includes the following steps:
Step S1, measuring a 10kV superconducting cable current limiting value according to N-1 guide rule requirements of ring network operation, and judging whether cable tide meets power safety and stability guide rule requirements or not;
In a specific embodiment, as shown in fig. 3, the specific process of judging whether the power flow of the cable meets the requirements of the power safety and stability guidelines is to judge that the power flow of the 110 line and the 10kV superconducting cable is smaller than the maximum flowing power limit of the superconducting cable body, such as the limit of the superconducting section of the tidal current, and to take a pre-load transferring measure to ensure that the power flow in the ring network cannot generate a linkage fault; the reasonable power flow distribution of the relevant equipment of the closed loop is ensured, means such as pre-control of load are adopted, and the requirements of the safety and stability guidelines of the electric power are met.
S2, judging the short-circuit current level of a 110kV line and a 110kV line bus of the loop closing operation system;
In a specific embodiment, as shown in fig. 4 and 5, calculation is performed according to the superconducting cable being 10% of the conventional cable impedance, the specific process of checking 110kV bus short-circuit current and 10kV bus short-circuit during loop closing operation and judging 110kV line and 110kV line bus short-circuit current level of the loop closing operation system is that checking 110kV bus short-circuit current during loop closing operation and judging whether the short-circuit current level is not greater than the maximum interruption capacity of the switch, if the short-circuit current is greater than the maximum interruption capacity of the switch, then adding 10kV current limiting reactor
S3, configuring 110kV lines and 10kV superconducting cable protection in the related looped network;
In a specific embodiment, as shown in fig. 6, for a power grid protection configuration suitable for the current carrying capability of a superconducting cable, in order to ensure the operation of a ring network, 110kV and 10kV protection configurations in the related ring network need to be configured by referring to 220kV equipment, and mainly are configured in a near backup double mode. Mainly comprises the following steps: the double optical fiber differential protection is configured for 110kV lines and 10kV superconducting cables, the double 110kV differential protection is configured for B stations, and the 10kV differential protection is configured for A stations 10kV 3M, B stations 10kV 3M and B stations 10kV 4M; back-up protection configuration distance, overcurrent and direction protection of the 10kV superconducting cable; the 10kV 3M feeder line of the A station, the 10kV 3M feeder line of the B station and the 10kV 4M feeder line of the B station are provided with conventional overcurrent and zero sequence protection and distance protection.
S4, detecting and configuring a standby power automatic switching device of a related disconnection point 110kV line and a 10kV superconducting cable bus;
In a specific embodiment, the automatic backup switching configuration is to meet the requirement that when the automatic backup switching device is operated in an open loop mode, the related disconnection points are provided with 110kV and 10kV bus-bar automatic backup switching devices, the specific process of detecting and configuring the automatic backup switching devices of the related disconnection points, namely, detecting whether the 10kV automatic backup switching of the station B and the 10kV automatic backup switching of the station A meet the 10kV 4M operation requirement or not, and if not, upgrading and updating are carried out.
For further details, reference is made to the foregoing description of the drawings, which is not described in detail herein.
The embodiment of the invention has the following beneficial effects:
The embodiment of the invention provides a 10kV superconducting closed loop running method, which adopts electromagnetic looped network running, improves the power supply reliability, satisfies N-1 in the loop and ensures the load safety; the power supply reliability of the 110kV transformer substation is improved, the power supply safety of a central area is guaranteed, double-loop power supply is formed, and power failure of a user caused by single power failure is avoided.
The above disclosure is only a preferred embodiment of the present invention, and it is needless to say that the scope of the invention is not limited thereto, and therefore, the equivalent changes according to the claims of the present invention still fall within the scope of the present invention.
Claims (1)
1. The 10kV superconducting closed loop operation method is characterized by comprising the following steps of:
Step S1, measuring a 10kV superconducting cable current limiting value according to N-1 guide rule requirements of ring network operation, and judging whether cable tide meets power safety and stability guide rule requirements or not;
Judging whether the tide values of the 110kV line and the 10kV superconducting cable are smaller than the maximum flowing power limit value of the superconducting cable body, if the tide values of the 110kV line and the 10kV superconducting cable are not smaller than the maximum flowing power limit value of the superconducting cable body, judging that the tide values exceed the superconducting section limit, and taking preset pre-load transferring measures;
S2, judging the short-circuit current level of a 110kV line and a 110kV line bus of the loop closing operation system; checking 110kV bus short-circuit current during loop closing operation, judging whether the short-circuit current level is not greater than the maximum interruption capacity of the switch, and if the short-circuit current is greater than the maximum interruption capacity of the switch, adding a 10kV current-limiting reactor;
s3, configuring 110kV lines and 10kV superconducting cable protection in the related looped network; the protection configuration of the 110kV line and the 10kV superconducting cable in the related ring network specifically comprises the configuration of the doubled optical fiber differential protection of the 110kV line and the 10kV superconducting cable, the configuration of the doubled 110kV bus differential protection of the B station, and the configuration of the 10kV 3M of the A station, the 10kV 3M of the B station and the 10kV 4M of the B station; the method also comprises the steps of back-up protection configuration distance, overcurrent and direction protection of the 10kV superconducting cable; the method comprises the steps that a 10kV 3M feeder line of an A station, a 10kV 3M feeder line of a B station and a 10kV 4M feeder line of a B station are provided with conventional overcurrent and zero sequence protection and distance protection;
s4, detecting and configuring a standby power automatic switching device of a related disconnection point 110kV line and a 10kV superconducting cable bus; the specific process of the automatic backup power switching device for detecting and configuring the 110kV line and the 10kV superconducting cable bus at the relevant disconnection point is that whether the 10kV automatic backup power switching of the station B and the 10kV automatic backup power switching of the station A meet the 10kV 4M operation requirement or not is detected, and if not, upgrading and updating are carried out;
wherein the 10kV superconducting cable impedance is 10% of the conventional cable impedance.
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| CN201911362547.5A CN110994623B (en) | 2019-12-26 | 2019-12-26 | 10KV superconducting closed loop operation method |
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| CN112186772A (en) * | 2020-10-13 | 2021-01-05 | 深圳供电局有限公司 | Power transmission system |
| CN112542839A (en) * | 2020-12-11 | 2021-03-23 | 深圳供电局有限公司 | Electric power system structure |
| CN112736924A (en) * | 2020-12-11 | 2021-04-30 | 深圳供电局有限公司 | Power transmission system |
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| CN104753171A (en) * | 2015-04-09 | 2015-07-01 | 国家电网公司 | Determination method of 220/110 KV electromagnetic loop network operation modes |
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| CN102684308B (en) * | 2012-05-18 | 2014-12-24 | 上海交通大学 | Superconducting state information-based power distribution network self-healing system and method |
| CN107565561A (en) * | 2017-10-12 | 2018-01-09 | 常州东瑞电力软件有限公司 | Closed loop network load simulation method based on closed loop power flow optimization analysis |
| CN108304613A (en) * | 2017-12-26 | 2018-07-20 | 贵州电网有限责任公司 | Closed loop network powered operation methods of risk assessment |
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| CN104753171A (en) * | 2015-04-09 | 2015-07-01 | 国家电网公司 | Determination method of 220/110 KV electromagnetic loop network operation modes |
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| Superconducting MV Cables to Replace HV Cables in Urban Area Distribution Grids;Mark Stemmle elt;2012 IEEE/PES Transmission and Distribution Conference and Exposition (T&D);20121231;pp.5-9 * |
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