CN202197148U - Direct current power supply system for substations - Google Patents
Direct current power supply system for substations Download PDFInfo
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- CN202197148U CN202197148U CN2011202643695U CN201120264369U CN202197148U CN 202197148 U CN202197148 U CN 202197148U CN 2011202643695 U CN2011202643695 U CN 2011202643695U CN 201120264369 U CN201120264369 U CN 201120264369U CN 202197148 U CN202197148 U CN 202197148U
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Abstract
The utility model provides a direct current power supply system for substations, which comprises a centralized monitoring module, a direct current operating power supply module, an uninterruptible power supply (UPS) power supply module, an inverter power supply module, a communication power supply module and a lithium iron phosphate energy storage module. All the modules of the direct current power supply system are connected into a public direct current bus through a relay switch, and each of the modules adopts the mode that a multi-submodule is in parallel connection with the public direct current bus to achieve redundant back-up. All the modules of the direct current power supply system are connected with the centralized monitoring module through a controller area network (CAN) communication bus, and the centralized monitoring module collects running status information of each module, performs unified management on all the modules of the system, enables a battery to achieve shallow charging and shallow discharging through intelligent coordination control, and leads the battery to achieve on-line automatic maintenance. The direct current power supply system has the advantages of being high in reliability, strong in impact resistant load capacity, free of maintenance, small in occupied area, energy-saving and environment-friendly. Service life of the battery is prolonged and performance of the battery is improved through an intelligent coordination control method.
Description
Technical field
The utility model relates to a kind of electric supply system; Particularly the transformer station based on ferric phosphate lithium cell uses DC power system; It is applicable to the on-line automatic non-maintaining control of transformer station with DC power system; This system is mainly used in all kinds of transformer stations or switchyards such as power plant, hydroelectric station and industrial enterprise's distribution, but also expanded application in communication base station or the building building DC power system.
Background technology
Existing station all is equipped with backup battery separately with the direct current operative power source in the DC power system, ups power, inverter, communication power supply; Storage battery basically all adopts VRLA battery; Though the more common lead-acid battery of serviceability has had and significantly improved, but still there is energy density and defective such as power density is low, operating temperature range is narrow, efficiency for charge-discharge is low, useful life is short.Moreover lead has been put into six kinds of harmful substance limited fields, and the present actual conditions that face are, no matter are sealing-type lead-acid battery or valve-control type lead-acid accumulator, all have serious acid pollution and lead contamination.Along with popularizing of unattended operation transformer station and urbanization transformer station; And the significantly raising of the intellectuality of transformer station direct current system, digitlization and automatization level, transformer station is had higher requirement with direct current system volume of battery, performance, fail safe and non-maintaining property.
Know according to the applicant; Characteristics such as ferric phosphate lithium cell has extended cycle life, capacity of resisting impact load is strong, specific energy is high, charge-discharge magnification is high, operating temperature range is wide, memory-less effect, non-maintaining, long-life and environmental protection are widely used in fields such as electric automobile, electric bicycle, electric tool at present.But, in the transforming plant DC power-supply system,, cause obviously shorten the useful life of battery because the job requirement of uninterrupted power supply causes battery to be in floating charge state for a long time.Simultaneously, the maintenance of traditional lead acid batteries still adopts the mode of manual intervention to carry out, and needs to transform to adapt to operational environment and requirement in advance.
Chinese patent document (publication number CN101752616 A) disclosed " the on-line maintenance method of accumulator capacity of direct current operative power source of substation "; It is by steps such as detection, replacing, moisturizing and chargings: detect and change the low storage battery of retained storage capacity earlier; With the storage battery supplementing water of changing behind the pole plate height; Add water according to its structural capacity in the ratio of 500ml/500Ah～1500ml/500Ah again; To charge in batteries, regulate and calibrate float charge voltage then, make the final retained storage capacity of storage battery be not less than 80% of structural capacity to 98.18%～101.82% of rated voltage.Chinese patent document (CN1588255 A) disclosed " DC power supply panel intelligent monitor and control method "; It is used for transformer station, power plant, factory and airport etc., and all will use the place of direct current cabinet; The complete set of equipments that is used for the above transformer station of 10KV and any capacity power plant will solve in the direct current cabinet system and DC power cabinet to be carried out devices such as centralized control, detection, protection, warning and demonstration.This method comprises: technical fields such as the monomer battery voltage detection of battery pack, insulating monitoring technology and many serial ports expansion technology.The applicant thinks: all there are the problem that automaticity is low of safeguarding in aforesaid " the on-line maintenance method of accumulator capacity of direct current operative power source of substation " and " DC power supply panel intelligent monitor and control method ".
Summary of the invention
The purpose of the utility model is: the utility model is applied to transformer station with in the DC power system with ferric phosphate lithium cell; Solve existing transformer station with problems such as storage battery floor space in the DC power system are big, discarded seriously polluted, adopted intelligent coordination control method to solve problems such as the long-term floating charge of ferric phosphate lithium cell reduction of service life and real automatic on-line maintenance simultaneously.
The technical scheme that the utility model adopted is: a kind of transformer station uses DC power system; Comprise direct current operative power source module, ups power module, inverter module, power supply module for communication, LiFePO4 energy-storage module and centralized monitor module, it is characterized in that:
Said LiFePO4 energy-storage module is connected on the dc bus through the first relay switch KM1; Said direct current operative power source module, ups power module, inverter module, power supply module for communication are connected on the dc bus through the second relay switch KM2, the 3rd relay switch KM3, the 4th relay switch KM4, the 5th relay switch KM5 respectively, and shared LiFePO4 energy-storage module; Said centralized monitor module realizes information communication through CAN communication bus and each module, and through DC bus powered; Every kind of module in the DC power system all can be parallel to the redundancy backup of the module number realization system of dc bus through increase;
Said LiFePO4 energy-storage module is to constitute by the ferric phosphate lithium cell group is parallelly connected with battery management system, the battery pack that the ferric phosphate lithium cell group is made up of a plurality of ferric phosphate lithium cells elder generations and back string.
Aforesaid transformer station uses DC power system; It is characterized in that; Said DC power system adopts the common DC bus connected mode; Each module all can realize the plug and play of on-line operation, and system can excise the functional module that has fault automatically, and under the situation that does not influence the normal operation of system, malfunctioning module is carried out on-line replacing.
Aforesaid transformer station uses DC power system; It is characterized in that said battery management system is made up of liquid crystal display screen, main control module and a plurality of collection/balance module, battery management system directly links to each other with the ferric phosphate lithium cell group; Acquisition module is gathered the voltage of cell and voltage, electric current and the temperature information of battery pack; Main control module carries out some predetermined algorithm with the data of gathering to be handled, and judges battery operated situation, and battery operated situation shows through the liquid crystal display screen on the battery management system in real time; And pass to centralized monitoring system through the CAN bus, centralized monitoring system is controlled the charger of direct current operative power source module again.
Aforesaid transformer station uses DC power system; It is characterized in that; Said centralized monitor module; Be made up of microcontroller, memory, intelligent substation ethernet interface, industry control touch-screen and multichannel CAN bus, RS485 bus and wireless communication bus, microcontroller is realized interconnected through parallel bus, spi bus and I2C bus and memory; The industry control touch-screen is realized being connected with the communication of microcontroller through Ethernet or CAN EBI; Microcontroller realizes that through Ethernet interface and transformer substation remote monitoring system communication is connected, and meets the IEC61850 communication protocol; Each sub-module of every kind of module of DC power system is connected on one road CAN bus; The centralized monitor module realizes that through the mobile radio terminal of GPRS, CDMA, radio frequency or WIFI communication and transformer station information is interconnected; Microcontroller is realized with the information of external equipment interconnected through the RS485 interface; The centralized monitor module is collected the state information of each module and the protection parameter information that the industry control touch-screen is set through the CAN bus; And it is saved in the memory; The centralized monitor module is according to the ferric phosphate lithium cell operating current of load operation electric current and setting; The employing intelligence control method calculates the charger electric current of real-time control, and control command is sent to the charger module in the direct current operative power source, thereby realizes the float management of ferric phosphate lithium cell.
The advantage of the utility model is that novel, rational in infrastructure, method is easy, is convenient to implement.The system of the utility model has excellent performance, and the efficiency for charge-discharge of battery is high, leakage current is little, charge-discharge magnification is big, strong, the wide operating temperature range of the anti-load shock ability of power-supply system.The system reliability of the utility model is high, and each module is connected on the dc bus through relay switch, and links through CAN bus and several kinds of monitoring modules; When a certain module breaks down, can in time cut off this module, can not influence the operate as normal of whole system.The control method of utilization the utility model can realize the on-line maintenance of battery, need not manual intervention; Can also avoid the battery long-term work in floating charge state, prolong the useful life of battery effectively.
The beneficial effect of the utility model also has: 1) environmental protection: ferric phosphate reason battery at production link, use link and scrap processing links and all do not have environmental pollution problems.2) save resource: ferric phosphate reason volume of battery is little in light weight, compare with lead-acid battery, and the battery of equal capacity, the volume of ferric phosphate lithium cell has only 1/3rd of lead-acid battery, and weight has only the half the of lead-acid battery.
Description of drawings
Fig. 1 is the structural representation of the transformer station of the utility model with DC power system.
Fig. 2 is the energy-storage module redundancy backup method sketch map of the ferric phosphate lithium cell of the utility model.
Fig. 3 is the ferric phosphate lithium cell energy-storage module sketch map of the utility model.
Fig. 4 is that the transformer station of the utility model is with DC power system centralized monitor modular structure figure.
Fig. 5 is the flow chart of the transformer station of the utility model with the intelligence control method of DC power system.
Embodiment
Below, the utility model is described further in conjunction with accompanying drawing through embodiment.
Referring to Fig. 1; In the present embodiment; Whole system has adopted the thought of managing distributed control concentratedly, and direct current operative power source module, ups power module, inverter module, power supply module for communication and LiFePO4 energy-storage module are connected on the centralized monitor module through the CAN bus.The LiFePO4 energy-storage module is connected on the dc bus through the first relay switch KM1; Each power module is connected on the dc bus through second to the 5th relay switch KM2～KM5, and each power module all uses ferric phosphate lithium cell battery in support.
Every kind of module in the DC power system all can be parallel to the redundancy backup of the module number realization system of dc bus through increase, and is as shown in Figure 2, is LiFePO4 energy-storage module redundancy backup method sketch map.
Compare with two independent electric power supply redundancy backups that traditional transforming plant DC power-supply system is adopted; The technical characterstic of this power system structure is; Each module constitutes through a plurality of low capacity submodule parallel connections, only the submodule that produces fault is excised after the system failure, and drops into the submodule of reserve; Can not exert an influence, improve the operation stability and the reliability of system other normal functional module.Simultaneously, these submodules can not break down simultaneously, so the submodule quantity of redundancy backup can significantly reduce, thereby reduce system cost.
In the present embodiment; The centralized monitor module adopts embedded microcontroller, and the centralized monitor module is concentrated the data of gathering from each sub-power module and battery management system, and the data of whole system are carried out data fusion; The working condition of judgement system; If find to have the abnormal work situation, can malfunctioning module be excised from dc bus through control relay switch KM1～KM5, guarantee the safety of whole system.
Referring to Fig. 3, in the present embodiment, the ferric phosphate lithium cell energy-storage module is composed in parallel by battery management system and ferric phosphate lithium cell group.Battery management system is made up of liquid crystal display screen, main control module, collection/balance module.The ferric phosphate lithium cell management system directly links to each other with the ferric phosphate lithium cell group; Acquisition module is gathered the voltage of cell and voltage, electric current, the temperature of battery pack; Main control module carries out some predetermined algorithm with the data of gathering to be handled, and judges battery operated situation, and battery operated situation shows through the liquid crystal display screen on the battery management system in real time; And pass to centralized monitoring system through the CAN bus, centralized monitoring system is controlled charger again.
Referring to Fig. 4, in the present embodiment, the centralized monitor module of transforming plant DC power-supply system is made up of microcontroller, memory, intelligent substation ethernet interface, industry control touch-screen and multichannel CAN, RS485 and GPRS or radio frequency wireless interface.The running state information that microcontroller is gathered each power module, checkout equipment and energy storage device through the CAN EBI through the running status of RS485 interface acquisition system external connection apparatus, and is kept at state information in the memory.The intelligent control algorithm of microcontroller executive system level to each sub-module sending controling instruction, is realized the coordination control between each power module, the energy-storage module.Memory is made up of storage medias such as RAM, ROM, Flash.The industry control touch-screen realizes and the communicating by letter of microcontroller through Ethernet or RS485 interface, and shows the system running state information by the microcontroller collection, comprises the working voltage, electric current, temperature, a-c cycle, power, malfunction of each module etc.; The parameter that the touch-screen of industry control simultaneously moves through the man-machine interface initialization system, and be kept in the Flash medium of memory.Microcontroller provides the ethernet interface that satisfies IEC61850 communication protocol, realizes the remote monitoring of intelligent substation.Microcontroller is analyzed command information after receiving the instruction from remote monitoring, and to the system module sending controling instruction of correspondence, realizes target control.The mobile radio terminal of communication interface in transformer station that is made up of GPRS or wireless radiofrequency unit sends running state information.
Referring to Fig. 5, provided the embodiment of the intelligence control method of transforming plant DC power-supply system.When centralized monitor module monitors during to the power-supply system power supply trouble, power-supply system is operated in the fault discharge stage, and ferric phosphate lithium cell group battery in support is the power-supply system power supply.When the battery continuous discharge, until capacity less than 10% or the voltage U BAT of battery less than protection voltage U min, the centralized monitor module is broken off relay switch KM1, prevents to put the damage ferric phosphate lithium cell.If backup battery works in normal condition, centralized monitor module controls relay switch then, dropping into redundant LiFePO4 energy-storage module is the power-supply system power supply.
If power supply trouble does not appear in power-supply system, and monitor the time requirement that battery reaches automatic maintenance, the centralized monitor module is safeguarded control automatically to battery.Whether the flag that centralized monitor module monitors battery is safeguarded automatically is 1, promptly is in discharge condition, if battery is in discharge condition, then monitors cell voltage U
BATWhat whether be higher than setting safeguards final discharging voltage U
O, then battery is carried out deep discharge through the power-supply system load if satisfy condition.If cell voltage is lower than final discharging voltage, then the centralized monitor module is 0 with the automatic home position of safeguarding of battery.If the flag that the monitoring battery is automatically safeguarded is 0, then the centralized monitor module is all filled battery fast, up to the capacity of battery greater than 98% or cell voltage reach capping value U
MAX, afterwards battery automatic safeguarded flag set 1, will safeguard timer T zero clearing automatically simultaneously.
If power-supply system power supply is normal and when need not battery safeguarded automatically, the centralized monitor module is carried out the shallow shallow control of putting of filling to battery, prevents the battery long-term work at the floating charge state, thereby improves the useful life and the serviceability of battery.If monitor battery capacity greater than 90%, and the charging flag is 0, and the centralized monitor module is regulated the output current of charger through the load current Data Control of monitoring, and battery is discharged with little discharge-rate, up to the capacity of battery less than 90%.After discharge finished, the centralized monitor module was 1 with the charging home position of battery, controls the output current of charger simultaneously; Charge to ferric phosphate lithium cell with the high charge multiplying power; Earlier, realize all filling with the constant voltage mode again with the current constant mode charging, up to the capacity of battery greater than 98%; At this moment, the charging flag of battery is changed to 0.
Claims (4)
1. a transformer station uses DC power system, comprises direct current operative power source module, ups power module, inverter module, power supply module for communication, LiFePO4 energy-storage module and centralized monitor module, it is characterized in that:
Said LiFePO4 energy-storage module is connected on the dc bus through the first relay switch KM1; Said direct current operative power source module, ups power module, inverter module, power supply module for communication are connected on the dc bus through the second relay switch KM2, the 3rd relay switch KM3, the 4th relay switch KM4, the 5th relay switch KM5 respectively, and shared LiFePO4 energy-storage module; Said centralized monitor module realizes information communication through CAN communication bus and each module, and through DC bus powered; Every kind of module in the DC power system all can be parallel to the redundancy backup of the module number realization system of dc bus through increase;
Said LiFePO4 energy-storage module is to constitute by the ferric phosphate lithium cell group is parallelly connected with battery management system, the battery pack that the ferric phosphate lithium cell group is made up of a plurality of ferric phosphate lithium cells elder generations and back string.
2. transformer station according to claim 1 uses DC power system; It is characterized in that; Said DC power system adopts the common DC bus connected mode; Each module all can realize the plug and play of on-line operation, and system can excise the functional module that has fault automatically, and under the situation that does not influence the normal operation of system, malfunctioning module is carried out on-line replacing.
3. transformer station according to claim 1 uses DC power system; It is characterized in that said battery management system is made up of liquid crystal display screen, main control module and a plurality of collection/balance module, battery management system directly links to each other with the ferric phosphate lithium cell group; Acquisition module is gathered the voltage of cell and voltage, electric current and the temperature information of battery pack; Main control module carries out some predetermined algorithm with the data of gathering to be handled, and judges battery operated situation, and battery operated situation shows through the liquid crystal display screen on the battery management system in real time; And pass to centralized monitoring system through the CAN bus, centralized monitoring system is controlled the charger of direct current operative power source module again.
4. transformer station according to claim 1 uses DC power system; It is characterized in that; Said centralized monitor module; Be made up of microcontroller, memory, intelligent substation ethernet interface, industry control touch-screen and multichannel CAN bus, RS485 bus and wireless communication bus, microcontroller is realized interconnected through parallel bus, spi bus and I2C bus and memory; The industry control touch-screen is realized being connected with the communication of microcontroller through Ethernet or CAN EBI; Microcontroller realizes that through Ethernet interface and transformer substation remote monitoring system communication is connected, and meets the IEC61850 communication protocol; Each sub-module of every kind of module of DC power system is connected on one road CAN bus; The centralized monitor module realizes that through the mobile radio terminal of GPRS, CDMA, radio frequency or WIFI communication and transformer station information is interconnected; Microcontroller is realized with the information of external equipment interconnected through the RS485 interface; The centralized monitor module is collected the state information of each module and the protection parameter information that the industry control touch-screen is set through the CAN bus; And it is saved in the memory; The centralized monitor module is according to the ferric phosphate lithium cell operating current of load operation electric current and setting; The employing intelligence control method calculates the charger electric current of real-time control, and control command is sent to the charger module in the direct current operative power source, thereby realizes the float management of ferric phosphate lithium cell.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011202643695U CN202197148U (en) | 2011-07-25 | 2011-07-25 | Direct current power supply system for substations |
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| Application Number | Priority Date | Filing Date | Title |
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| CN2011202643695U CN202197148U (en) | 2011-07-25 | 2011-07-25 | Direct current power supply system for substations |
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| CN202197148U true CN202197148U (en) | 2012-04-18 |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270878A (en) * | 2011-07-25 | 2011-12-07 | 国网电力科学研究院武汉南瑞有限责任公司 | Direct current power supply system for transformer substation and control method thereof |
| CN102769324A (en) * | 2012-06-15 | 2012-11-07 | 张家港市泓溢电源科技有限公司 | Charge and discharge power supply circuit structure of common bus bar energy-saving recoverable storage battery |
| CN105914854A (en) * | 2015-10-10 | 2016-08-31 | 陶杰 | Control method of electric vehicle intelligent charging pile system |
| CN106646037A (en) * | 2016-11-28 | 2017-05-10 | 国家电网公司 | DC system real-time detection method for transformer station |
| CN111614074A (en) * | 2020-06-18 | 2020-09-01 | 国网江苏省电力有限公司江阴市供电分公司 | Terminal direct current power supply method of power consumption information acquisition system for power users of 35kV and above |
-
2011
- 2011-07-25 CN CN2011202643695U patent/CN202197148U/en not_active Expired - Lifetime
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102270878A (en) * | 2011-07-25 | 2011-12-07 | 国网电力科学研究院武汉南瑞有限责任公司 | Direct current power supply system for transformer substation and control method thereof |
| CN102270878B (en) * | 2011-07-25 | 2013-12-25 | 国网电力科学研究院武汉南瑞有限责任公司 | Direct current power supply system for transformer substation and control method thereof |
| CN102769324A (en) * | 2012-06-15 | 2012-11-07 | 张家港市泓溢电源科技有限公司 | Charge and discharge power supply circuit structure of common bus bar energy-saving recoverable storage battery |
| CN105914854A (en) * | 2015-10-10 | 2016-08-31 | 陶杰 | Control method of electric vehicle intelligent charging pile system |
| CN106646037A (en) * | 2016-11-28 | 2017-05-10 | 国家电网公司 | DC system real-time detection method for transformer station |
| CN111614074A (en) * | 2020-06-18 | 2020-09-01 | 国网江苏省电力有限公司江阴市供电分公司 | Terminal direct current power supply method of power consumption information acquisition system for power users of 35kV and above |
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| Date | Code | Title | Description |
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| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20120418 Effective date of abandoning: 20131225 |
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| RGAV | Abandon patent right to avoid regrant |