CN111769580A - Direct current power supply system for 110kV intelligent energy station - Google Patents
Direct current power supply system for 110kV intelligent energy station Download PDFInfo
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- CN111769580A CN111769580A CN202010768326.4A CN202010768326A CN111769580A CN 111769580 A CN111769580 A CN 111769580A CN 202010768326 A CN202010768326 A CN 202010768326A CN 111769580 A CN111769580 A CN 111769580A
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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
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/345—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering using capacitors as storage or buffering devices
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Abstract
A direct-current power supply system for a 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 a direct-current 220V bus for the station through an AC/DC converter II, the direct-current microgrid 750V bus uses the direct-current 220V bus as standby power for the station through the DC/DC converter I, and the suppression or the conduction is realized through the difference value of direct-current voltages at output ends; 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. By utilizing the invention, the MW lithium iron phosphate peak-shaving energy storage system can be reused, a lead-acid storage battery for a station is cancelled, a conventional UPS power supply is cancelled, and a direct-current bus voltage for a small-capacity super capacitor stabilizing station is configured, so that the reliability and the stability of the whole system are improved, meanwhile, the occupied area is reduced, the investment is saved, the operation and maintenance workload is reduced, the environment is more friendly, and the advantage of multi-station fusion is fully exerted.
Description
Technical Field
The invention relates to a power supply system of an intelligent energy station, in particular to a direct-current power supply system for a 110kV intelligent energy station.
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.
Disclosure of Invention
The invention aims to solve the technical problem of overcoming the defects of the prior art and provides a 110kV intelligent energy station direct-current power supply system capable of multiplexing a MW-level peak-shaving energy storage system.
The technical scheme adopted for solving the technical problem is that 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 takes the direct-current 220V bus for the station as standby power through the DC/DC converter I, and the suppression or the conduction is realized through the difference value of direct-current voltages 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.
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 module and the DC/DC converter I module is consistent with the high-frequency switch configuration principle 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.
According to the invention, on the premise that a total station alternating current-direct current microgrid system is constructed in an intelligent energy station, a direct current power supply system framework for the station is integrated and optimized, a MW lithium iron phosphate peak-shaving energy storage system is reused, a lead-acid storage battery for the station is cancelled, a conventional UPS power supply is cancelled, a direct current bus voltage for a small-capacity super capacitor stabilization station is configured, and a total station and communication direct current power supply system is integrated.
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 differs from the prior art mainly 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 patent 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. The utility model provides a 110kV wisdom energy station uses DC power supply system which 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 3, 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 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.
5. The 110kV intelligent energy station DC power supply system according to one of claims 1 to 4, wherein: the configuration principle of the AC/DC converter II module and the DC/DC converter I module 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 4, wherein: the parameter of the super capacitor I is 500kW/30 s.
7. The 110kV intelligent energy station DC power supply system according to one of claims 2 to 4, wherein: the parameter of the super capacitor II is 50 kW/15 s.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112838607A (en) * | 2020-12-31 | 2021-05-25 | 国网上海能源互联网研究院有限公司 | Deep fusion method and system for multi-station fusion comprehensive energy station |
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2020
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112838607A (en) * | 2020-12-31 | 2021-05-25 | 国网上海能源互联网研究院有限公司 | Deep fusion method and system for multi-station fusion comprehensive energy station |
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