CN212258417U - DC power supply system for 220kV intelligent energy station - Google Patents

DC power supply system for 220kV intelligent energy station Download PDF

Info

Publication number
CN212258417U
CN212258417U CN202021582735.7U CN202021582735U CN212258417U CN 212258417 U CN212258417 U CN 212258417U CN 202021582735 U CN202021582735 U CN 202021582735U CN 212258417 U CN212258417 U CN 212258417U
Authority
CN
China
Prior art keywords
bus
current
station
direct
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
Application number
CN202021582735.7U
Other languages
Chinese (zh)
Inventor
孙志云
李小云
钟怡
李辉
卢小龙
刘胜利
张延�
谢彬
易娜
陈微
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
China Energy Engineering Group Hunan Electric Power Design Institute Co Ltd
Original Assignee
China Energy Engineering Group Hunan Electric Power Design Institute Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by China Energy Engineering Group Hunan Electric Power Design Institute Co Ltd filed Critical China Energy Engineering Group Hunan Electric Power Design Institute Co Ltd
Priority to CN202021582735.7U priority Critical patent/CN212258417U/en
Application granted granted Critical
Publication of CN212258417U publication Critical patent/CN212258417U/en
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Images

Landscapes

  • Supply And Distribution Of Alternating Current (AREA)

Abstract

The direct-current power supply system for the 220kV 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 station direct-current 220V bus I through an AC/DC converter II, the direct-current microgrid 750V bus supplies power to the station direct-current 220V bus II through the DC/DC converter I, and the station direct-current 220V bus I and the station direct-current 220V bus II are connected through a direct-current interconnection switch; 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

DC power supply system for 220kV intelligent energy station
Technical Field
The utility model relates to a power supply system in wisdom energy station, concretely relates to 220kV 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; a220 kV transformer substation direct-current power supply system adopts single bus sectional wiring, 3 groups of charging modules are configured, and 2 groups of lead-acid storage batteries are hung on two sections of buses respectively. 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 220kV wisdom energy station uses DC power supply system.
The utility model provides a technical scheme that its technical problem adopted is, 220kV wisdom energy station uses direct current electrical power generating system, include the AC microgrid 380/220V generating line and the direct current microgrid 750V generating line of I hookup through AC/DC converter, the AC microgrid 380/220V generating line is through AC/DC converter II for station with direct current 220V generating line I power supply, direct current microgrid 750V generating line is through DC/DC converter I for station with direct current 220V generating line II power supply, station with direct current 220V generating line I and station with direct current 220V generating line II through the direct current contact switch associative; 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 I, a super capacitor II and a DC/DC converter II are arranged on the station direct current 220V bus I.
Further, a station direct current feeder cabinet II and a DC/DC converter III are arranged on the station direct current 220V bus II.
Further, the DC/DC converter II and the DC/DC converter III are 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 I.
Further, the configuration principle of the AC/DC converter II module of the station direct current 220V bus I and the DC/DC converter I module of the station direct current 220V bus II is consistent with the high-frequency switch configuration principle of the existing direct current system, and the N +1 redundant configuration adopts 6 40A power supply current conversion modules.
Further, the parameter of the super capacitor I is 500 kW/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 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 I, a 6-DC/DC converter I, a 7-station direct current 220V bus II, an 8-direct current interconnection switch, a 9-alternating current feeder cabinet, a 10-MW-level lithium iron phosphate energy storage unit, an 11-super capacitor I, a 12-station direct current feeder cabinet I, a 13-super capacitor II, a 14-DC/DC converter II, a 15-station direct current feeder cabinet II, a 16-DC/DC converter III and a 17-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 AC microgrid 380/220V bus 1 and a DC microgrid 750V bus 2 connected by an AC/DC converter i 3, the AC microgrid 380/220V bus 1 supplies power to a station DC 220V bus i 5 by an AC/DC converter ii 4, the DC microgrid 750V bus 2 supplies power to a station DC 220V bus ii 7 by a DC/DC converter i 6, and the station DC 220V bus i 5 and the station DC 220V bus ii 7 are connected by a DC interconnection switch 8.
Be equipped with interchange feeder cabinet 9 and MW level lithium iron phosphate energy storage 10 on the 380/220V bus 1 of interchange microgrid, be equipped with ultracapacitor system I11 on the 750V bus 2 of direct current microgrid.
The station direct current 220V bus I5 is provided with a station direct current feeder cabinet I12, a super capacitor II 13 and a DC/DC converter II 14, the station direct current 220V bus II 7 is provided with a station direct current feeder cabinet II 15 and a DC/DC converter III 16, and the DC/DC converter II 14 and the DC/DC converter III 16 are connected with a 48V direct current bus 17 in communication.
The 220V direct current system in the station adopts 220V single bus sectional wiring. Under normal conditions, the direct current interconnection switch 8 is opened, the direct current 220V bus I5 and the station direct current 220V bus II 7 independently operate, when the alternating current microgrid 380/220V bus 1 or the direct current microgrid 750V bus 2 loses power, the direct current interconnection switch 8 is closed, and the station direct current 220V bus I5 and the station direct current 220V bus II 7 operate in parallel.
The direct-current micro-grid 750V bus 2 supplies power to important loads such as a data center and the like besides loads on a direct-current 220V bus II 7 for a station, and a power supply of the direct-current micro-grid comprises two paths of mutually-prepared alternating-current inlet wires, two paths of energy storage power supplies and a distributed photovoltaic power supply, so that the reliability is high. The 750V bus of the direct-current micro-grid supplies power to the II 7 direct-current 220V bus for the station through the I6 DC/DC converter, and in view of the high reliability of the direct-current sub-micro-grid, the reliability of the II 7 direct-current 220V bus for the station is far higher than that of the existing direct-current system, and the requirements of protection, control and the like on equipment with higher voltage requirements can be completely met.
The alternating-current microgrid 380/220V bus 1 supplies power to a station direct-current 220V bus I5 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. Different from the station direct current 220V bus II 7, the method comprises the following steps: a voltage stabilizing device is not arranged on the station direct current 220V bus I5, but a set of 50kW (15 s) super capacitor I11 is arranged on the station direct current 220V bus I5 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 bus voltage can be well dealt with when the power supply is switched to a standby power supply for power supply.
One path of the alternating current feeder cabinet 9 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 I5.
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 of a station direct current 220V bus I5 and the configuration principle of a DC/DC converter I6 module of a station direct current 220V bus II 7 are consistent with the high-frequency switch configuration principle of the existing direct current system, and 6 40A power supply current conversion modules 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 the MW-level lithium iron phosphate energy storage 10 is arranged as a standby power supply of the AC/DC micro grid and is connected to the 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-grade lithium iron phosphate energy storage 10 adopts a lithium iron phosphate battery, is one of core products for future development of the battery industry, and has incomparable advantages compared with other power batteries, such as large cell energy density, rapid discharge with 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 I11 and a super capacitor II 13 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 10 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 11 is configured on the 750V bus of the direct-current micro grid, it is ensured that stable voltage is provided for the circuit at the moment of power supply switching.
1 set of 50kW (15 s) super capacitor II 13 is configured on the I5 section of the DC 220V bus for the station. 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 13 is configured on the I5 section of the DC 220V bus for the station, so that the voltage of the DC bus is stabilized under the conditions of power supply 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 (8)

1.220kV wisdom energy station uses direct current power supply system, its characterized in that: the direct-current microgrid system 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 a station direct-current 220V bus I through an AC/DC converter II, the direct-current microgrid 750V bus supplies power to the station direct-current 220V bus II through the DC/DC converter I, and the station direct-current 220V bus I and the station direct-current 220V bus II are connected through a direct-current interconnection switch; 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 220kV intelligent energy station DC power supply system of claim 1, wherein: and a station direct current feeder cabinet I, a super capacitor II and a DC/DC converter II are arranged on the station direct current 220V bus I.
3. The 220kV intelligent energy station DC power supply system of claim 2, wherein: and a direct current feeder cabinet II for the station and a DC/DC converter III are arranged on the direct current 220V bus II for the station.
4. The DC power supply system for the 220kV intelligent energy station as claimed in claim 3, wherein: and the DC/DC converter II and the DC/DC converter III are connected with a communication 48V direct current bus.
5. The DC power supply system for 220kV intelligent energy station according to one of claims 1 to 4, 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 I.
6. The DC power supply system for 220kV intelligent energy station according to one of claims 1 to 4, wherein: the configuration principle of the AC/DC converter II module of the station direct current 220V bus I and the DC/DC converter I module of the station direct current 220V bus II is consistent with the high-frequency switch configuration principle of the existing direct current system, and the N +1 redundant configuration adopts 6 40A power supply current conversion modules.
7. The DC power supply system for 220kV intelligent energy station according to one of claims 1 to 4, wherein: the parameter of the super capacitor I is 500 kW/30 s.
8. The DC power supply system for 220kV intelligent energy station according to one of claims 2-4, wherein: the parameter of the super capacitor II is 50 kW/15 s.
CN202021582735.7U 2020-08-03 2020-08-03 DC power supply system for 220kV intelligent energy station Active CN212258417U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CN202021582735.7U CN212258417U (en) 2020-08-03 2020-08-03 DC power supply system for 220kV intelligent energy station

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
CN202021582735.7U CN212258417U (en) 2020-08-03 2020-08-03 DC power supply system for 220kV intelligent energy station

Publications (1)

Publication Number Publication Date
CN212258417U true CN212258417U (en) 2020-12-29

Family

ID=73981167

Family Applications (1)

Application Number Title Priority Date Filing Date
CN202021582735.7U Active CN212258417U (en) 2020-08-03 2020-08-03 DC power supply system for 220kV intelligent energy station

Country Status (1)

Country Link
CN (1) CN212258417U (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022028116A1 (en) * 2020-08-03 2022-02-10 中国能源建设集团湖南省电力设计院有限公司 Station-used direct current power supply system for 220 kv intelligent energy station

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2022028116A1 (en) * 2020-08-03 2022-02-10 中国能源建设集团湖南省电力设计院有限公司 Station-used direct current power supply system for 220 kv intelligent energy station

Similar Documents

Publication Publication Date Title
CN104022528B (en) A kind of microgrid system coordination control method based on multiple elements design energy storage
CN103532158B (en) A kind of micro-grid new energy hybrid energy storage system
WO2022028116A1 (en) Station-used direct current power supply system for 220 kv intelligent energy station
CN103595063A (en) Energy storage converter and battery energy storage system of energy storage converter
CN207134804U (en) A kind of tandem type energy storage converter device utilized based on different battery modules differentiation
CN209982089U (en) Energy storage system primary topological structure based on PCS and DC-DC converter stack
CN107069976A (en) A kind of expansible group string data large-scale energy storage system
CN114977381A (en) Energy storage system control circuit with multiple parallel battery clusters and control method thereof
CN206807150U (en) A kind of expansible group string data large-scale energy storage system
CN103117595A (en) Distributed direct current independent power supply system
CN212258417U (en) DC power supply system for 220kV intelligent energy station
CN212543374U (en) Direct-current power supply system for 110kV intelligent energy station
CN211790793U (en) Retired battery echelon utilization system
CN116436128B (en) Battery cluster equalization method of energy storage system
CN203119615U (en) Distributed direct-current independent power supply system
CN112688420A (en) AC/DC power supply topological structure suitable for all-in-one station
CN111769580A (en) Direct current power supply system for 110kV intelligent energy station
CN204559131U (en) Be connected to the transformer and distribution power station of energy-storage system
CN105207326A (en) Novel structure for battery charging mode replacement common direct-current bus of new energy automobile
CN115441486A (en) Light storage charging and discharging battery replacing system and system matching method
CN212162825U (en) Distributed energy storage system-based multi-parameter dynamic adjustment flexible charging and discharging control system
CN204928324U (en) Charge mode novel structure of dc bus is altogether changed to new energy automobile battery
CN209982088U (en) Primary topological structure of electrochemical energy storage system based on group-string PCS
CN208046326U (en) MW class microgrid energy-accumulating power station based on ferric phosphate lithium cell
Kou et al. The Design Method of AC-DC Microgrid Based on Smart Energy Station

Legal Events

Date Code Title Description
GR01 Patent grant
GR01 Patent grant