CN212543374U - Direct-current power supply system for 110kV intelligent energy station - Google Patents
Direct-current power supply system for 110kV intelligent energy station Download PDFInfo
- Publication number
- CN212543374U CN212543374U CN202021589170.5U CN202021589170U CN212543374U CN 212543374 U CN212543374 U CN 212543374U CN 202021589170 U CN202021589170 U CN 202021589170U CN 212543374 U CN212543374 U CN 212543374U
- Authority
- CN
- China
- Prior art keywords
- bus
- current
- direct
- station
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000004146 energy storage Methods 0.000 claims abstract description 27
- 239000003990 capacitor Substances 0.000 claims abstract description 22
- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 claims abstract description 14
- 230000001629 suppression Effects 0.000 claims abstract description 3
- 238000004891 communication Methods 0.000 claims description 12
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000002253 acid Substances 0.000 abstract description 15
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000001737 promoting effect Effects 0.000 abstract description 2
- 238000012544 monitoring process Methods 0.000 description 8
- 238000010276 construction Methods 0.000 description 6
- 238000012423 maintenance Methods 0.000 description 4
- 238000000034 method Methods 0.000 description 4
- 230000008569 process Effects 0.000 description 4
- 230000004044 response Effects 0.000 description 3
- 238000013473 artificial intelligence Methods 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000010354 integration Effects 0.000 description 2
- 230000033228 biological regulation Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000007667 floating Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 230000003446 memory effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000006855 networking Effects 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000004088 simulation Methods 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Landscapes
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The direct-current power supply system for the 110kV intelligent energy station comprises an alternating-current microgrid 380/220V bus and a direct-current microgrid 750V bus which are connected through an AC/DC converter I, wherein the alternating-current microgrid 380/220V bus supplies power to the direct-current 220V bus for the station through an AC/DC converter II, the direct-current microgrid 750V bus supplies power to the station through the DC/DC converter I, the direct-current 220V bus serves as standby power, and the suppression or the conduction is realized through the difference value of direct-current voltage at the output end; be equipped with interchange feeder cabinet and MW level lithium iron phosphate energy storage on the interchange microgrid 380/220V bus, be equipped with ultracapacitor system I on the direct current microgrid 750V bus. Utilize the utility model discloses, can multiplexing MW lithium iron phosphate peak shaving energy storage system, cancel the station with lead acid battery, cancel conventional UPS power, the configuration low capacity super capacitor is direct current bus voltage for stable station, when promoting entire system's reliability and stability, has reduced the occupation of land, has saved the investment, has reduced fortune dimension work load, and is more friendly to the environment, full play the advantage that the multistation fuses.
Description
Technical Field
The utility model relates to a power supply system of wisdom energy station, concretely relates to 110kV wisdom energy station uses direct current power supply system.
Background
The national 'new capital construction' is simply divided into 7 fields, including 5G base station construction, new energy automobile charging piles, large data centers, artificial intelligence, industrial internet and the like, and the digital and intelligent era of power enterprises is immediately coming. The large-scale construction of the 5G base station can bring great increase of power consumption, the power consumption of the electric automobile is an incremental power selling market which is easier to control by national power grid companies, a big data center is also a power consuming big household which is named outside, and the situation of surplus power generation supply can be relieved to a certain extent, so that a power enterprise, the 5G base station, the big data center, a charging pile, a vehicle networking system, artificial intelligence, an industrial internet and the like are tightly connected together to form a multi-station fusion intelligent energy station, in 1+ N, 1 is a transformer substation, and N can comprise a data center station, a charging and replacing station, an energy storage station, a 5G base station and the like as required.
The construction of a multi-station integration intelligent energy station is developed, the existing resource value of a transformer substation can be fully excavated and utilized, value-added service is provided for the inside and the outside, three flows of energy source flow, service flow and data flow are integrated, resource sharing, risk sharing, benefit win-win and mutual object interconnection are realized, and an energy sharing mutual-aid new state is created.
In the conventional integrated power supply system for the transformer substation, a direct-current power supply system for the transformer substation, an alternating-current uninterruptible power supply system, an inverter power supply system for power and a power supply system for communication are integrally assembled, and a lead-acid storage battery is used as a backup power supply. The high-frequency switch, the storage battery, the alternating current power supply, the communication power supply, the monitoring system and other technologies are mature, the transformer substation adopts an integrated power supply system, the communication direct current system and the station direct current system are combined, operation verification for nearly ten years is carried out, rich operation experience is accumulated, and the high-frequency switch, the storage battery, the alternating current power supply, the communication power supply, the monitoring system and other technologies are familiar and accepted by vast operation and maintenance personnel; a direct-current power supply system of a 110kV transformer substation adopts single-bus wiring, 1 group of charging modules are configured, and 1 group of lead-acid storage batteries are hung on a 220V direct-current bus. From the perspective of capital construction and operation and maintenance, the space and the necessity for optimizing and integrating the integrated power supply system are not large.
However, when the lead-acid storage battery of the conventional direct-current system runs normally, the lead-acid storage battery is in a floating charge state under the normal condition, so that the difficulty of running monitoring and maintenance is increased, and many problems are difficult to find in time. The inconsistency between batteries causes the overcharge and undercharge of different batteries after multiple times of charging to be intensified, so that the capacity of the whole battery pack is continuously reduced. When the actual capacity of the battery is reduced to below 90% of the rated capacity, the battery enters a decline period, and when the capacity is reduced to 80%, the battery enters a sharp decline period. The backup power supply time of the storage battery is greatly shortened, the nominal service life of a manufacturer needs to be carried out under the specified operation temperature and the standard charging and discharging mode (including the load size), and the conditions can only be achieved in a laboratory actually. Years of operation experience proves that the actual service life of the lead-acid storage battery is far from the service life marked. In practical engineering application, the replacement is generally required for 4-5 years. The acid storage battery is restricted by the innate conditions, and has the problems of poor cycle life, poor high and low temperature performance, sensitive charge and discharge process, difficult deep discharge performance capacity recovery and environmental pollution.
Along with the construction of a multi-station integrated intelligent energy station, the property of the transformer substation and the internal structure of the transformer substation are changed in a coverage manner, and accordingly optimization and updating of traditional equipment, system architecture and operation and maintenance modes are achieved.
The 'multi-station integration' intelligent energy station comprises elements such as a transformer substation, a data center and a centralized energy storage power station. An alternating current-direct current series-parallel micro-grid is constructed in a total station, and on the basis, a more optimized solution is urgently needed for a total station direct current power supply system.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that, overcome prior art not enough, provide a can multiplexing MW level peak regulation energy storage system's 110kV wisdom energy station uses DC power supply system.
The utility model provides a technical scheme that its technical problem adopted is, 110kV wisdom energy station is with direct current electrical power generating system, include the alternating current microgrid 380/220V bus and the direct current microgrid 750V bus that couple through AC/DC converter I, alternating current microgrid 380/220V bus gives the station through AC/DC converter II and uses direct current 220V bus power supply, direct current microgrid 750V bus gives the station through DC/DC converter I and uses direct current 220V bus as the reserve power, realizes suppressing or switches on through the difference of output direct current voltage; be equipped with interchange feeder cabinet and MW level lithium iron phosphate energy storage on the interchange microgrid 380/220V bus, be equipped with ultracapacitor system I on the direct current microgrid 750V bus.
Further, a station direct current feeder cabinet, a super capacitor II and a DC/DC converter II are arranged on the station direct current 220V bus.
Further, the DC/DC converter II is connected with a communication 48V direct current bus.
Furthermore, one path of the alternating current feeder cabinet is supplied with power through an alternating current microgrid 380/220V bus, and the other path of the alternating current feeder cabinet is connected to a station direct current 220V bus.
Furthermore, the configuration principle of the AC/DC converter II and the DC/DC converter I is consistent with that of a high-frequency switch of the existing direct current system, and the N +1 redundant configuration adopts 6 30A power supply current conversion modules.
Further, the parameter of the super capacitor I is 500kW/30 s.
Further, the parameter of the super capacitor II is 50 kW/15 s.
The utility model discloses under the whole station alternating current-direct current microgrid system prerequisite is found at wisdom energy station, direct current power supply system framework for the station is integrated and is optimized, multiplexing MW lithium iron phosphate peak shaving energy storage system, cancel the lead acid battery for the station, cancel conventional UPS power, dispose the low capacity super capacitor and stabilize the station and use direct current bus voltage, integrate whole station and communication direct current power supply system, when promoting entire system's reliability and stability, the occupation of land has been reduced, the investment has been saved, the fortune dimension work load has been reduced, more friendly to the environment, full play has the advantage that the multistation fuses.
Drawings
FIG. 1 is a wire frame diagram of an embodiment of the present invention;
fig. 2 is a wire-frame diagram of an integrated power supply system for a conventional intelligent substation.
In the figure: the power supply system comprises a 1-alternating current microgrid 380/220V bus, a 2-direct current microgrid 750V bus, a 3-AC/DC converter I, a 4-AC/DC converter II, a 5-station direct current 220V bus, a 6-DC/DC converter I, a 7-alternating current feeder cabinet, 8-MW-level lithium iron phosphate energy storage, a 9-super capacitor I, a 10-station direct current feeder cabinet, a 11-super capacitor II, a 12-DC/DC converter II, and a 13-communication 48V direct current bus.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and examples.
Referring to fig. 1, the embodiment includes an alternating-current microgrid 380/220V bus 1 and a direct-current microgrid 750V bus 2 which are connected through an AC/DC converter i 3, the alternating-current microgrid 380/220V bus 1 supplies power to a station-use direct-current 220V bus 5 through an AC/DC converter ii 4, and the direct-current microgrid 750V bus 2 supplies backup power to the station-use direct-current 220V bus 5 through a DC/DC converter i 6, replaces an original lead-acid battery, and realizes suppression or conduction through a difference value of direct-current voltages at output ends.
Be equipped with interchange feeder cabinet 7 and MW level lithium iron phosphate energy storage 8 on the 380/220V generating line 1 of interchange microgrid, be equipped with ultracapacitor system I9 on the 750V generating line 2 of direct current microgrid.
And a station direct current feeder cabinet 10, a super capacitor II 11 and a DC/DC converter II 12 are arranged on the station direct current 220V bus 5, and the DC/DC converter II 12 is connected with a communication 48V direct current bus 13.
The 220V direct current system in the station adopts 220V single bus connection. The 380/220V bus 1 of alternating current microgrid is used as a main power supply source, and when the alternating current microgrid is out of power, the direct current microgrid 750V bus is automatically switched to supply power.
The alternating-current microgrid 380/220V bus 1 supplies power to the station direct-current 220V bus 5 through an AC/DC converter II 4, and when a fault occurs, the station direct-current 220V bus is supplied with power by two paths of energy storage power supplies, so that the reliability of the system is higher than that of a conventional station direct-current system. A set of 50kW (15 s) super capacitor I9 is arranged on a station direct current 220V bus 5 to stabilize the voltage of the bus, so that the impact influence of the response time of power electronic equipment such as an energy storage device, an AC/DC converter and a DC/DC converter on the voltage of the bus when the power supply is switched to a standby power supply can be well dealt with.
The 750V bus 2 of the direct-current micro-grid mainly supplies power for important loads such as a data center and the like except for replacing an original lead-acid storage battery as a standby power supply of a station direct-current 220V direct-current bus 5, and the power supply of the direct-current micro-grid comprises two paths of alternating-current incoming lines which are mutually standby, two paths of energy storage power supplies and a distributed photovoltaic power supply, so that the high-reliability direct-current micro-grid has high reliability. The direct-current microgrid 750V bus 2 is used as a standby power supply for a station through a DC/DC converter I6, and in view of the high reliability of the direct-current microgrid, the reliability of the direct-current microgrid is far higher than that of a lead-acid storage battery of an existing direct-current system, and the requirements of protection, control and other devices with higher voltage requirements can be completely met.
One path of the alternating current feeder cabinet 7 is supplied with power through an alternating current microgrid 380/220V bus 1, and the other path of the alternating current feeder cabinet is connected to a station direct current 220V bus 5.
Referring to fig. 1-2, the present invention mainly differs from the prior art in that:
(1) the AC/DC converter 4 and the DC/DC converter 6 are adopted to replace the prior high-frequency switching power supply. In order to ensure reliability, the configuration principle of an AC/DC converter II 4 module and a DC/DC converter I6 module of a station direct current 220V bus 5 is consistent with the high-frequency switch configuration principle of the existing direct current system, and 6 power source current conversion modules of 30A are adopted for N +1 redundant configuration. Each power supply current transformation module has a monitoring function inside, displays output voltage/current values and can work independently without depending on a main monitoring unit. When the monitoring system works normally, the module can be communicated with the master monitoring unit to receive the instruction of the monitoring unit.
(2) The total station cancels the existing lead-acid storage battery, and sets MW-level lithium iron phosphate energy storage 8 as a standby power supply of the AC/DC micro grid, which is connected to 380/220V bus 1 of the AC micro grid. The operating characteristic that the lithium iron phosphate energy storage system for peak shaving is not deeply charged and deeply discharged is combined, the peak shaving residual capacity of the lithium iron phosphate energy storage system is used as a standby power supply of the alternating current-direct current hybrid micro-grid under any working condition, and under the condition of an unplanned island and other pole ends, the alternating current-direct current bus voltage can be stabilized, and the backup power supply guarantee is provided.
The MW-level lithium iron phosphate energy storage 8 adopts a lithium iron phosphate battery, is one of core products of future development of the battery industry, and has incomparable advantages compared with other power batteries, such as large cell energy density, capability of rapid discharge of large current, no memory effect, good consistency, long cycle life, high safety, small volume, light weight and the like. On the premise of ensuring reliability, the MW energy storage system is directly multiplexed (energy storage is used for peak shaving, the operation rule of the MW energy storage system is also utilized, and the residual capacity is used as the standby of a direct-current power supply) from the consideration of technical performance and economy, and the traditional lead-acid storage battery is cancelled.
Multiplexing MW energy storage System principle: the MW-level lithium iron phosphate energy storage station participates in peak shaving of a large power grid, in order to reduce the influence of energy storage battery inconsistency on an energy storage system, the discharge depth of the energy storage battery peak shaving is not more than 80%, and the remaining 20% of capacity of the battery is used as a standby power supply of the alternating-current and direct-current series-parallel micro-grid under any working condition. The capacity allowance of the peak shaving battery of the MW energy storage power station is considered, and a lead-acid storage battery of a direct current system for a conventional station is eliminated.
(3) And a super capacitor I9 and a super capacitor II 11 are configured, so that the reliability of the direct current system is further ensured. The super capacitor has long cycle life, high power density, and the ability of quick charge and discharge and instant release of large current. The discharge process of the super capacitor belongs to a physical process, and is safer and more stable compared with a chemical reaction. Compared with a storage battery, the super capacitor has the advantage of high power density, is about 10 times of that of a lead-acid storage battery, and is suitable for the condition that the energy duration is 1-100S.
Considering that although the power electronic response speed is high, the MW-grade lithium iron phosphate energy storage 8 is managed by the in-station source grid charge storage coordination control system, and the charge-discharge conversion process has a certain response time, therefore, considering that 1 set of 500kW (30 s) super capacitor i 9 is configured on the 750V bus of the direct-current micro grid, stable voltage is provided for the circuit at the moment of power supply switching.
A direct current 220V bus 5 for the station is provided with 1 set of 50kW (15 s) super capacitor II 11. In the conventional integrated power supply system scheme of the transformer substation, communication loads are also directly supplied with power through DC/DC. But the station load and the communication load are different in nature. The load supplied by the station direct current system comprises a frequent load and an impact load, the load supplied by the communication direct current system is a frequent load, and the system voltage is stable. 1 set of 50kW (15 s) super capacitor II 11 is configured on the DC 220V bus 5 for the station, so that the voltage of the DC bus is stabilized under the conditions of power switching and opening and closing, and voltage drop is avoided.
The bus voltage of a conventional substation direct current system is 105% of the nominal voltage during normal operation, the bus voltage should not exceed 110% of the nominal voltage during online equalizing charging voltage, and the bus voltage at the end of emergency discharging is 85% of the nominal voltage, namely the bus voltage of the direct current system with the nominal voltage of 220V is allowed to fluctuate between 187V and 242V. Through simulation experiments, the super capacitor has independent power supply capacity, and the voltage level can be guaranteed to meet the requirement and can be continuously over 60 s. According to experimental analysis data, even if switching-on and switching-off operations exist, technically, the direct current bus voltage is stabilized by using a small-capacity super capacitor, voltage drop is avoided, and the voltage range can be stabilized at 187-242V in an accident situation. The technical scheme can completely meet the requirement.
Various modifications and variations of the present invention may be made by those skilled in the art, and they are still within the scope of the present invention, provided they are within the scope of the claims and their equivalents.
What is not described in detail in the specification is prior art that is well known to those skilled in the art.
Claims (7)
1.110kV wisdom energy station uses direct current power supply system, its characterized in that: the direct-current microgrid 750V bus supplies power to the direct-current 220V bus for the station through the DC/DC converter I, and the suppression or conduction is realized through the difference value of direct-current voltage at the output end; be equipped with interchange feeder cabinet and MW level lithium iron phosphate energy storage on the interchange microgrid 380/220V bus, be equipped with ultracapacitor system I on the direct current microgrid 750V bus.
2. The 110kV intelligent energy station DC power supply system according to claim 1, wherein: and a direct current feeder cabinet for the station, a super capacitor II and a DC/DC converter II are arranged on the direct current 220V bus for the station.
3. The 110kV intelligent energy station DC power supply system according to claim 2, wherein: and the DC/DC converter II is connected with a communication 48V direct current bus.
4. The 110kV intelligent energy station DC power supply system according to one of claims 1 to 3, wherein: one path of the alternating current feeder cabinet is supplied with power through an alternating current microgrid 380/220V bus, and the other path of the alternating current feeder cabinet is connected to a station direct current 220V bus.
5. The 110kV intelligent energy station DC power supply system according to claim 2 or 3, wherein: the configuration principle of the AC/DC converter II and the DC/DC converter I is consistent with that of a high-frequency switch of the conventional direct current system, and the N +1 redundant configuration adopts 6 30A power supply current conversion modules.
6. The 110kV intelligent energy station DC power supply system according to one of claims 1 to 3, wherein: the parameter of the super capacitor I is 500kW/30 s.
7. The 110kV intelligent energy station DC power supply system according to claim 2 or 3, wherein: the parameter of the super capacitor II is 50 kW/15 s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021589170.5U CN212543374U (en) | 2020-08-03 | 2020-08-03 | Direct-current power supply system for 110kV intelligent energy station |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021589170.5U CN212543374U (en) | 2020-08-03 | 2020-08-03 | Direct-current power supply system for 110kV intelligent energy station |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN212543374U true CN212543374U (en) | 2021-02-12 |
Family
ID=74527517
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021589170.5U Active CN212543374U (en) | 2020-08-03 | 2020-08-03 | Direct-current power supply system for 110kV intelligent energy station |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN212543374U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769580A (en) * | 2020-08-03 | 2020-10-13 | 中国能源建设集团湖南省电力设计院有限公司 | A 110kV DC power system for smart energy stations |
| CN113612380A (en) * | 2021-08-27 | 2021-11-05 | 国网江苏省电力有限公司电力科学研究院 | A method and device for starting and stopping an inverter of an integrated energy station |
-
2020
- 2020-08-03 CN CN202021589170.5U patent/CN212543374U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111769580A (en) * | 2020-08-03 | 2020-10-13 | 中国能源建设集团湖南省电力设计院有限公司 | A 110kV DC power system for smart energy stations |
| CN113612380A (en) * | 2021-08-27 | 2021-11-05 | 国网江苏省电力有限公司电力科学研究院 | A method and device for starting and stopping an inverter of an integrated energy station |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN211790784U (en) | An integrated charging station for optical storage and charging | |
| CN103606943B (en) | A kind of microgrid Ni-MH battery energy storage system | |
| CN107612051B (en) | AC/DC hybrid system based on dual-redundancy power electronic transformer | |
| CN210867226U (en) | Charging station | |
| CN115102153A (en) | Electro-optical hydrogen storage micro-grid for transformer substation and control method thereof | |
| CN105305495A (en) | Dispatching method for multi-energy complement micro-grid system | |
| CN112688420A (en) | AC/DC power supply topological structure suitable for all-in-one station | |
| CN115441486A (en) | Light storage charging and discharging battery replacing system and system matching method | |
| CN115352311A (en) | An energy management method for an optical storage charging and discharging system | |
| CN211790793U (en) | Retired battery echelon utilization system | |
| CN110011408A (en) | A kind of moving emergency power-supply system and its working method | |
| WO2022028116A1 (en) | Station-used direct current power supply system for 220 kv intelligent energy station | |
| CN212543374U (en) | Direct-current power supply system for 110kV intelligent energy station | |
| CN115425691A (en) | A multi-voltage level flexible interconnection device | |
| CN108347067A (en) | A kind of microgrid framework and control method containing battery energy storage and generator | |
| CN204258410U (en) | Possesses the energy storage converter device of many Battery packs and super capacitor access function | |
| CN105207326A (en) | Novel structure for battery charging mode replacement common direct-current bus of new energy automobile | |
| CN215835162U (en) | Battery plug-in box and energy storage system are optimized to electricity core level | |
| CN212258417U (en) | DC power supply system for 220kV intelligent energy station | |
| CN113629800B (en) | Battery cell level optimized battery plug box, energy storage system and application thereof | |
| CN114614543A (en) | Active equalization assembly and method between battery cluster boxes | |
| CN113783196A (en) | Power supply system of intelligent energy station | |
| CN204559131U (en) | Be connected to the transformer and distribution power station of energy-storage system | |
| CN220754388U (en) | High-integration battery energy storage system | |
| CN111769580A (en) | A 110kV DC power system for smart energy stations |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |