CN103117595A - Distributed direct current independent power supply system - Google Patents
Distributed direct current independent power supply system Download PDFInfo
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- CN103117595A CN103117595A CN2013100828652A CN201310082865A CN103117595A CN 103117595 A CN103117595 A CN 103117595A CN 2013100828652 A CN2013100828652 A CN 2013100828652A CN 201310082865 A CN201310082865 A CN 201310082865A CN 103117595 A CN103117595 A CN 103117595A
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Abstract
The invention discloses a distributed direct current independent power supply system which breaks up a whole direct current power supply system into parts, reasonably divides the direct current power supply system into a plurality of independent operating direct current power supply subsystems, and is arranged to be nearby electricity utilization equipment. The distributed direct current independent power supply system comprises a communication bus, a master control system, a plurality of independent direct current power supply subsystems, a plurality of box-type packaged parallel-connection battery packs, at least one charging unit and at least one monitoring unit, wherein the master control system and the plurality of independent direct current power supply subsystems are respectively connected with the communication bus. Each direct current power supply subsystem comprises a plurality of sections of direct current buses connected with a feeder line terminal unit, and every two sections of adjacent direct current buses are connected through a switch and are allocated. The output ends of the battery packs are respectively connected to the direct current buses through the switches. The at least one charging unit is used for charging all the battery packs and supplies electricity to the direct current buses in hot spare mode. The at least one monitoring unit is connected onto the communication bus, measures and upwards transmits signals of the direct current power supply subsystems to the master control system and receives power grid electricity utilization information of the master control system.
Description
Technical field
The present invention relates to a kind of distributed DC autonomous power supply system.
Background technology
Present DC power-supply system; generally adopt three to fill the Design Mode that two electricity, the segmentation of 220V dc bus add interconnection switch; direct current is powered to power consumption equipment by feed panel and minute electric screen that is dispersed in each protection cell or the DC power supply subsystem that is connected on dc bus via the dc bus of master-control room, and this is traditional centralized DC power-supply system.As the centralized DC power-supply system; insulation reduction or large-area multiple branch circuit ground connection simultaneously easily occurs; more crucial is when multipoint earthing occurring in the secondary circuit that is in same electrical connection; before difference, the meeting appearance potential is poor; when short trouble is arranged, may cause differential protection malfunction or protection tripping.
Chinese patent application 201110130055.0 discloses a kind of when in system, certain part breaks down and be unlikely to affect the distributed DC uninterruptable power supply system of other equipment normal power supplies.This distributed DC uninterruptable power supply system comprises that dc bus and several are distributed in the DC power supply subsystem of different occasions, and described several DC power supply subsystems are all by consisting of supply network on dc bus.Solve centralized DC power system huge in field, present station and taken a large amount of spaces, place, also avoided the small fault due to DC power system, had influence on the demand of the reliable power supply of all devices.
Chinese patent application 201110130055.0 obtains certain technological progress, has solved that the occupied ground space is little, the problem such as uninterrupted power supply when system breaks down, but still has following problem:
1) there is larger distributed capacitance in the networking of system power supply
The design of this distributed DC uninterruptible power system supply network can increase distributed capacitance.Distributed capacitance makes circuit be capacitive when circuit is unloaded, crosses the precision that conference affect branch road insulation detection, causes the wrong report grounding, and raises the voltage of end, and Electric Power Equipment Insulation is worked the mischief and affects the anti-electromagnetic interference capability of equipment.When more crucial is capacitance current that distributed capacitance produces is excessive, when one point earth occurring in secondary circuit, also may cause the protection equipment malfunction.
2) can not realize the selectivity cooperation (differential cooperation) of the superior and the subordinate's protection device between system
The DC power-supply system power supply unit is many; the feeder line branch road distributes wide; there are many branch roads need to circuit breaker be set in system or fuse is protected; this distributed DC uninterruptible power system links together subsystem by dc bus, can not realize selecting correct protection scheme and protection reasonable coordination between the superior and the subordinate.Causing occurring overstep tripping magnifies electric power accident.
3) system's storage battery operating condition is uncertain
No matter be the centralized DC power-supply system, or this distributed DC uninterruptible power system, batteries is in the floating charge stand-by state always, if wherein some storage battery off-capacity occurs or the problem such as overcharges, can only patrol and examine and the property checked discharges and recharges to detect by regular internal resistance, this detection mode real-time is relatively poor, can not the very first time storage battery operating mode be judged; In addition, it is also cumbersome that the problem storage battery carries out online replacing maintenance, has certain potential safety hazard.
4) system is complicated, the fault point is many
This distributed DC uninterruptible power system design is comparatively complicated; Dc bus is segmentation repeatedly, bus is safeguarded or needing when batteries discharges and recharges to be carried out the throw-cut multi-way switch, increased the fault point of system, and dc bus networking power supply easily causes between each section of dc bus alters mutually, these problem points are in case occur, not only power consumption equipment is caused serious harm, and the operations staff is more difficult in time investigates, more can not carries out on-line maintenance.
5) lack effective monitoring system
Chinese patent application 201110130055.0 is that the communication unit in subsystem passes through RS485 or CAN bus or with the host computer combined network communication in Ethernet interface and field, station, the loaded down with trivial details treating capacity of information is large, information processing and the monitoring of shortage integral body.
Summary of the invention
The objective of the invention is for overcoming above-mentioned the deficiencies in the prior art, a kind of distributed DC autonomous power supply system is provided, DC power-supply system will be broken the whole up into parts, DC power-supply system rationally will be divided into the direct current supply subsystem of several independent operatings separately, be placed in the power consumption equipment place nearby.
For achieving the above object, the present invention adopts following technical proposals:
A kind of distributed DC autonomous power supply system, it comprises the direct current supply subsystem of communication bus and the connected turn-key system of difference and several independent operatings; Each direct current supply subsystem includes some sections dc buss, and described dc bus is connected with the line feed terminals unit, and every two sections adjacent dc buss connect by switch, every two sections adjacent dc buss configurations:
The battery pack that several of box encapsulation are in parallel, its output is connected to dc bus by switch respectively;
At least one charhing unit is used for each batteries charging, and stand-by heat is given DC bus powered; And
At least one monitoring unit, be connected to communication bus, give turn-key system on signal measurement with the direct current supply subsystem and receive the electrical network power information of turn-key system, set the time period of electrical network peak and low valley, the batteries charging time period is controlled at the low power consumption phase, with to electrical network peak clipping Pinggu, control charhing unit to the alternately charging of each battery pack, and control at least one battery pack and be communicated with dc bus; The input and output voltage of the capacity of Real-time Collection battery pack, voltage, internal resistance, temperature and charhing unit, current information, thus judge whether battery capacity satisfies power demands.
Described turn-key system comprises integrated power supply supervisory control system, main website background system, and both communicate by letter with the IEC61850 stipulations mutually; Described integrated power supply supervisory control system, main website background system all are connected to communication bus.
Described DC bus-bar voltage is 110V; Described battery pack, charhing unit and monitoring unit are all supported plug and play.
Described battery pack is lithium ion battery group or valve-controlled sealed lead-acid battery pack.
Preferably, described battery pack is the lithium ion battery group, adopts distributed DC power-supply battery case to carry out box encapsulation, has active equalization system, the large electric current quick charge of standard connector support.
Described active equalization system comprises several balanced units of cascade, the balanced management of realization to multi-section series lithium ionic cell, state-of-charge difference between adjacent two joint cells is judged, and be delivered in the lower single battery of SOC the high battery of SOC state is unnecessary, realize that battery capacity maximizes, and extend battery pack cycle life.
Described switch is the reverse-blocking tetrode thyristor device, progressively turn-offs under monitoring unit is controlled, the impulse current that produces when effectively avoiding deciliter; Also be provided with the conversion fling-cut switch that possesses sampling functions between described battery pack and dc bus, when monitoring unit breaks down, the conversion fling-cut switch judges according to the sampling of itself whether the capacity of battery pack can also continue power supply, and realizes a switching of battery pack.
The input of described charhing unit is connected to the electric current inlet wire, output is connected to respectively dc bus and each battery pack by switch, and described charhing unit is several charging modules that is connected in parallel, the precision of voltage regulation≤± 0.5%, precision of steady current≤± 1.0%, ripple coefficient≤0.5%; Freely throw according to field condition and move back, be output as DC110V; Charhing unit is at ordinary times just alternately to some Battery pack group chargings, realize that (degree of depth discharges and recharges in online equalizing charge, eliminate the difference between each batteries) directly do not hang on dc bus, only have when all battery pack repair and maintenances, just as standby charging device to bussed supply; When monitoring unit breaks down, can autonomous operation.
Described electric current inlet wire is for exchanging the output electricity of inlet wire, solar panel or wind-driven generator, and described interchange inlet wire is AC380V or AC220V, and the output electricity of described solar panel or wind-driven generator also is connected to dc bus by switch; During normal operation, battery pack alternately hangs on dc bus and powers to power consumption equipment, and it is hot standby that charhing unit breaks away from bus, controls charhing unit to alternately charging of battery pack by monitoring unit.
Monitoring unit is by the capacity of state-of-charge (SOC) Real-Time Monitoring lithium battery, the lithium cell charging process is adopted the constant current mode charging, adjust charging current limiter value size according to the highest single battery voltage, when single battery voltage reaches 3.65V or battery management system (BMS) and judges that SOC reaches 100%, stop charging.
The invention has the beneficial effects as follows:
1) with after the DC power-supply system cutting, each direct current subsystem independent operating is without the connection on circuit; thereby the distributed capacitance at full station is diminished, and the interference that system is caused weakens, during the secondary circuit one point earth; a little less than the impact of capacitor discharge electric current, be difficult to cause again the protection malfunction.
2) each direct current subsystem independent operating, power supply nearby, cable length can determine substantially, and bus, feeder line, power consumption equipment are distinct, it is very simple that differential cooperation becomes.
3) batteries adopts the reverse-blocking tetrode thyristor device at the operating mechanism that the bus upslide moves back and charhing unit moves back at the bus upslide, throw a process that a buffering is arranged when moving back functional module, progressively turn-off, and the impulse current of effectively having avoided deciliter brings fluctuation to busbar voltage.
Lithium ion battery group direct effect is to bus, what constantly circulate discharges and recharges, and the performance of battery and health status inform the operations staff in real time by the monitoring of monitoring unit, and battery hidden danger can be found to process ahead of time ahead of time, be in the floating charge stand-by state, battery status is uncertain no longer always.
Lithium ion battery is mainly used in the new energy fields such as electric automobile, photovoltaic energy storage at present in power industry; Application in transformer station is in the starting stage, choice for use of the present invention lithium ion battery, compare with the valve-controlled sealed lead-acid battery, advantage is outstanding:
1. extra long life, the cycle life of valve-controlled sealed lead-acid battery is the highest to be only had 500 times, and cycle life of lithium ion battery reaches more than 2000 times.
2. electric current 2C fast charging and discharging greatly, and the valve-controlled sealed lead-acid battery is now without this performance.
3. lithium ion battery operating temperature range broad (75 ℃ of 20 ℃～﹢ of ﹣).
4. the lithium ion battery volume is little, and capacity is large.
5. lithium ion battery can be with filling with use, need not first discharge to recharge.
6. environmental protection.Lithium ion battery does not contain any heavy metal and rare metal, and is nontoxic, pollution-free, is absolute environmental protection battery.
Lithium ion battery adopts box encapsulation technology, and standard interface is connected to system.Monitoring unit is automatically controlled charhing unit according to set charging strategy and control strategy and is alternately completed discharging and recharging of all battery pack, and information and the current running statuses (BMS) such as the capacity of 24 hours all battery pack of real time on-line monitoring, voltage, internal resistance, temperature, and with the monthly accounting logging of these data formations for operations staff's reference.When having any Battery pack group not reach service requirement, monitoring unit realizes that by controlling the reverse-blocking tetrode thyristor device throwing of battery pack moves back.
Dc bus or charhing unit also can be introduced the charging of solar energy, wind energy in some particular locality, make DC power-supply system become the free of contamination clear energy sources of a complete environmental protection system.
4) distributed DC autonomous power supply system has been eliminated the association of dc bus between each power consumption equipment, has effectively evaded the problem that dc bus is altered mutually.The direct current subsystem shortens to cable length between power consumption equipment, and sectional area of wire can be ignored the decay of power transmission signal, and dc bus can directly be depressured to 110V, and the low pressure miniature circuit breaker electric pressure that drives full station is lowered, and improves economy.
Battery pack, charhing unit and monitoring unit are all supported plug and play, the three adopts modularized design, charhing unit as a functional module, monitoring unit as a functional module, battery pack adopts after box encapsulation also as a functional module, building of direct current subsystem is exactly the process of a module assembled, and each functional module externally all adopts the electric and physical interface of unified standard, all supports plug and play, after arbitrary functional module broke down, spare part is convenient the replacement all; Reduce the fault impact that operation brings on system, the malfunctioning module of replacing can carry out the off-line type maintenance.
5) in system, monitoring unit is completed automatically to charhing unit and the monitoring and the control strategy that possess the modules such as battery case of active equalization system, need not manual intervention, the rear system that goes wrong can timely alert notice operations staff process, and is applicable to unattended operation transformer station fully.Monitoring unit can be by the capacity of SOC Real-Time Monitoring lithium ion battery, the lithium cell charging process is adopted the constant current mode charging, adjust charging current limiter value size according to the highest single battery voltage, when single battery voltage reaches 3.65V or BMS and judges that SOC reaches 100%, stop charging.Monitoring unit is to the multiple stipulations communication of upper support, possess by the various information in real-time detecting system the direct current subsystem is carried out intellectual analysis, the senior application such as hidden danger anticipation, and analysis result is formed monthly form submission user, assisting users is realized the management of system.
Monitoring unit carries out intellectual analysis according to the operation of power networks floor data that turn-key system gets, judge peak period and the low ebb phase of electrical network electricity consumption, take to control in the selection to battery charging interval section, perhaps manually set the time period of peak and low valley by artificial judgment, avoid in peak times of power consumption, battery being charged, battery charging interval section is controlled at the low power consumption phase, electrical network is played the effect in peak clipping Pinggu.
The direct current supply subsystem of turn-key system and independent operating all is connected to communication bus, and information exchange is convenient and swift, can whole effectively control the normal operation of all subsystems.
Description of drawings
Fig. 1 is the structural representation of traditional DC power-supply system;
Fig. 2 is the structural representation of distributed DC electric power system of the present invention;
Fig. 3 is communications rack composition of the present invention;
Fig. 4 is embodiment 1 direct current subsystem structure schematic diagram;
Fig. 5 is embodiment 2 direct current subsystem structure schematic diagrames;
Fig. 6 is embodiment 3 direct current subsystem structure schematic diagrames;
Fig. 7 is embodiment 4 direct current subsystem structure schematic diagrames;
Fig. 8 is embodiment 5 direct current subsystem structure schematic diagrames;
Fig. 9 is embodiment 6 direct current subsystem structure schematic diagrames;
Figure 10 is embodiment 7 direct current subsystem structure schematic diagrames;
Figure 11 is embodiment 8 direct current subsystem structure schematic diagrames;
Figure 12 is embodiment 9 direct current subsystem structure schematic diagrames;
Figure 13 is the circuit diagram of active equalization system.
Embodiment
The present invention will be further elaborated below in conjunction with drawings and Examples, should be noted that following explanation is only in order to explain the present invention, its content not to be limited.
The present invention is applicable to power station, transformer station, current conversion station etc., and all need the system of direct current supply.
A kind of distributed DC autonomous power supply system, it comprises the direct current supply subsystem of communication bus and the connected turn-key system of difference and several independent operatings; Each direct current supply subsystem includes some sections dc buss, and described dc bus is connected with the line feed terminals unit, and every two sections adjacent dc buss connect by switch, every two sections adjacent dc buss configurations:
The battery pack that several of box encapsulation are in parallel, its output is connected to dc bus by switch respectively;
At least one charhing unit is used for each batteries charging, and stand-by heat is given DC bus powered; And
At least one monitoring unit, be connected to communication bus, give turn-key system on signal measurement with the direct current supply subsystem and receive the electrical network power information of turn-key system, set the time period of electrical network peak and low valley, the batteries charging time period is controlled at the low power consumption phase, with to electrical network peak clipping Pinggu, control charhing unit to the alternately charging of each battery pack, and control at least one battery pack and be communicated with dc bus; The input and output voltage of the capacity of Real-time Collection battery pack, voltage, internal resistance, temperature and charhing unit, current information, thus judge whether battery capacity satisfies power demands.
Described turn-key system comprises integrated power supply supervisory control system, main website background system, and both communicate by letter with the IEC61850 stipulations mutually; Described integrated power supply supervisory control system, main website background system all are connected to communication bus.
Described DC bus-bar voltage is 110V; Described battery pack, charhing unit and monitoring unit are all supported plug and play.
Described battery pack is lithium ion battery group or valve-controlled sealed lead-acid battery pack.
Preferably, described battery pack is the lithium ion battery group, adopts distributed DC power-supply battery case to carry out box encapsulation, has active equalization system, the large electric current quick charge of standard connector support.
Described active equalization system comprises several balanced units of cascade, the balanced management of realization to multi-section series lithium ionic cell, state-of-charge difference between adjacent two joint cells is judged, and be delivered in the lower single battery of SOC the high battery of SOC state is unnecessary, realize that battery capacity maximizes, and extend battery pack cycle life.
Described switch is the reverse-blocking tetrode thyristor device, progressively turn-offs under monitoring unit is controlled, the impulse current that produces when effectively avoiding deciliter; Also be provided with the conversion fling-cut switch that possesses sampling functions between described battery pack and dc bus, when monitoring unit breaks down, the conversion fling-cut switch judges according to the sampling of itself whether the capacity of battery pack can also continue power supply, and realizes a switching of battery pack.
The input of described charhing unit is connected to the electric current inlet wire, output is connected to respectively dc bus and each battery pack by switch, and described charhing unit is several charging modules that is connected in parallel, the precision of voltage regulation≤± 0.5%, precision of steady current≤± 1.0%, ripple coefficient≤0.5%; Freely throw according to field condition and move back, be output as DC110V; Charhing unit is at ordinary times just alternately to some Battery pack group chargings, realize that (degree of depth discharges and recharges in online equalizing charge, eliminate the difference between each batteries) directly do not hang on dc bus, only have when all battery pack repair and maintenances, just as standby charging device to bussed supply; When monitoring unit breaks down, can autonomous operation.
Described electric current inlet wire is for exchanging the output electricity of inlet wire, solar panel or wind-driven generator, and described interchange inlet wire is AC380V or AC220V, and the output electricity of described solar panel or wind-driven generator also is connected to dc bus by switch; During normal operation, battery pack alternately hangs on dc bus and powers to power consumption equipment, and it is hot standby that charhing unit breaks away from bus, controls charhing unit to alternately charging of battery pack by monitoring unit.
Monitoring unit is by the capacity of state-of-charge (SOC) Real-Time Monitoring lithium battery, the lithium cell charging process is adopted the constant current mode charging, adjust charging current limiter value size according to the highest single battery voltage, when single battery voltage reaches 3.65V or battery management system (BMS) and judges that SOC reaches 100%, stop charging.
Below the concrete case study on implementation of each direct current subsystem:
Direct current subsystem as shown in Figure 4 comprises one section dc bus, and dc bus is connected with the line feed terminals unit, this dc bus configuration: 1# battery pack and 2# battery pack, a charhing unit and a monitoring unit in parallel.
Battery-powered as 1#, during the 2# batteries charging, K switch 1, K switch 4 disconnect, K switch 2, K switch 3 closures; When the 2# batteries charging is complete, K switch 3 disconnects, and the 2# battery pack is in hot standby state.When the 1# battery electric quantity was not enough, system transferred the battery-powered 1# batteries charging by 2# automatically to, at this moment, K switch 1, K switch 4 closures, then K switch 2 disconnects, and charhing unit is to the 1# batteries charging, the complete K switch 1 of charging disconnects, and the 1# battery pack is in hot standby state.
If charhing unit occurs abnormal, K switch 3, K switch 4 be closure simultaneously, and two Battery pack groups are given DC bus powered simultaneously, and power-on time extends one times.
If battery pack occurs abnormal, K switch 5 closures, by charhing unit to bussed supply.Any one occurs charhing unit and battery pack extremely, and monitoring unit has alert notice backstage and control centre simultaneously, and arrangement personnel in time process.
Charhing unit is at ordinary times just alternately to two Battery pack chargings, realize that (degree of depth discharges and recharges in online equalizing charge, eliminate the difference between each batteries) directly do not hang on bus, unless when two Battery pack repair and maintenances, K switch 7 just can be closed, and charhing unit is given DC bus powered as standby charging device.
The electric current inlet wire is for exchanging inlet wire.
Battery pack adopts lithium battery, supports large electric current quick charge.Charhing unit adopts the AC/DC charging module.
Direct current subsystem is as shown in Figure 5 compared unique not being both with embodiment 1: every group storage battery is connected on bus by two groups of reverse-blocking tetrode thyristor devices, and is standby each other, increases the reliability of bus.
Embodiment 3
Direct current subsystem is as shown in Figure 6 compared unique not being both with embodiment 1: system has increased 3# battery pack and this two group storage battery of 4# battery pack more, during normal operation, two group storage batteries hang on bus simultaneously and power, 2 * 2 mode replaces input, charhing unit increases the reliability of battery pack to respectively 2 group storage batteries that break away from being charged successively.
Embodiment 4
Direct current subsystem is as shown in Figure 7 compared unique not being both with embodiment 1: introduced the new clear energy sources such as solar energy, wind energy, on the one hand, in the situation that solar energy, wind energy resources abundance, directly by dc bus to power devices, K switch 6 is connected, charhing unit and battery pack all are in hot standby state, in the situation that solar energy, wind energy resources deficiency drop into battery pack.
On the other hand, charhing unit can directly be got alternating current from electrical network and convert direct current to batteries charging, also can directly introduce solar energy, wind energy and convert stable direct current to batteries charging.
Embodiment 5
Direct current subsystem is as shown in Figure 8 compared unique not being both with embodiment 1: two Battery pack groups are to having increased the conversion fling-cut switch between dc bus, the conversion fling-cut switch possesses sampling functions, when monitoring unit breaks down, the conversion fling-cut switch can judge according to the sampling of itself whether the capacity of battery pack can also continue power supply, and carries out a switching of battery pack.
Embodiment 6
Direct current subsystem as shown in Figure 9 comprises two sections dc buss, dc bus is connected with the line feed terminals unit, two sections dc buss connect by interconnection switch, and every section dc bus configuration is identical with embodiment 1, and just two sections bus four group storage batteries share cover charhing unit and a monitoring unit.Monitoring unit detects the operating condition of batteries simultaneously, and charhing unit is given four Battery pack group chargings successively.
Direct current subsystem is as shown in figure 10 compared unique not being both with embodiment 6: every section bus belt charhing unit separately, two sections buses still share a cover monitoring unit.
Embodiment 8
Direct current subsystem as shown in figure 11 comprises one section dc bus, and dc bus is connected with the line feed terminals unit, this dc bus configuration: a lead acid accumulator battery pack, a charhing unit, and at least one monitoring unit; The charhing unit input is for exchanging inlet wire.
During normal operation, charhing unit to charge in batteries, provides frequent load current through dc bus simultaneously, and storage battery is in the floating charge stand-by state.
Embodiment 9
Direct current subsystem as shown in figure 12 comprises one section dc bus, dc bus is connected with the line feed terminals unit, this dc bus configuration: a monitoring unit, several lead acid accumulator battery pack and the charhing unit that coordinates with each lead-acid batteries, the charhing unit input is for exchanging inlet wire.
Single-unit 12V boosts to 110V with special charging unit charging with increasing apparatus, is parallel on bus and uses.During normal operation, the output of charhing unit directly outputs to bus to power devices by increasing apparatus, and battery is in the floating charge stand-by state.
Although above-mentionedly by reference to the accompanying drawings the specific embodiment of the present invention is described; but be not limiting the scope of the invention; on the basis of technical scheme of the present invention, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection scope of the present invention.
Claims (9)
1. a distributed DC autonomous power supply system, is characterized in that, it comprises the direct current supply subsystem of communication bus and the connected turn-key system of difference and several independent operatings; Each direct current supply subsystem includes some sections dc buss, and described dc bus is connected with the line feed terminals unit, and every two sections adjacent dc buss connect by switch, every two sections adjacent dc buss configurations:
The battery pack that several of box encapsulation are in parallel, its output is connected to dc bus by switch respectively;
At least one charhing unit is used for each batteries charging, and stand-by heat is given DC bus powered; And
At least one monitoring unit, be connected to communication bus, give turn-key system on signal measurement with the direct current supply subsystem and receive the electrical network power information of turn-key system, set the time period of electrical network peak and low valley, the batteries charging time period is controlled at the low power consumption phase, with to electrical network peak clipping Pinggu, control charhing unit to the alternately charging of each battery pack, and control at least one battery pack and be communicated with dc bus; The input and output voltage of the capacity of Real-time Collection battery pack, voltage, internal resistance, temperature and charhing unit, current information, thus judge whether battery capacity satisfies power demands.
2. a kind of distributed DC autonomous power supply system according to claim 1, is characterized in that, described turn-key system comprises integrated power supply supervisory control system and main website background system, and both communicate by letter with the IEC61850 stipulations mutually; Described integrated power supply supervisory control system, main website background system all are connected to communication bus.
3. a kind of distributed DC autonomous power supply system according to claim 1, is characterized in that, DC bus-bar voltage is 110V; Described battery pack, charhing unit and monitoring unit are all supported plug and play.
4. a kind of distributed DC autonomous power supply system according to claim 1, is characterized in that, described battery pack is lithium ion battery or valve-controlled sealed lead-acid battery.
5. a kind of distributed DC autonomous power supply system according to claim 5, it is characterized in that, described battery pack is the lithium ion battery group, adopt distributed DC power-supply battery case to carry out box encapsulation, has active equalization system, described active equalization system comprises several balanced units of cascade, the balanced management of realization to multi-section series lithium ionic cell, state-of-charge difference between adjacent two joint cells is judged, and be delivered in the lower single battery of SOC the high battery of SOC state is unnecessary, realize that battery capacity maximizes, and prolongation battery pack cycle life.
6. a kind of distributed DC autonomous power supply system according to claim 1, is characterized in that, described switch is the reverse-blocking tetrode thyristor device, progressively turn-offs under monitoring unit is controlled; Also be provided with the conversion fling-cut switch that possesses sampling functions between described battery pack and dc bus, when monitoring unit breaks down, judge according to sampling own whether the capacity of battery pack can also continue power supply, and realize a switching of battery pack.
7. a kind of distributed DC autonomous power supply system according to claim 1, it is characterized in that, the input of described charhing unit is connected to electric power incoming line, output is connected to respectively dc bus and each battery pack by switch, described charhing unit is several charging modules that is connected in parallel, freely throw according to field condition and move back, be output as DC110V.
8. a kind of distributed DC autonomous power supply system according to claim 1, it is characterized in that, described electric current inlet wire is for exchanging the output electricity of inlet wire, solar panel or wind-driven generator, described interchange inlet wire is AC380V or AC220V, and the output electricity of described solar panel or wind-driven generator also is connected to dc bus by switch.
9. a kind of distributed DC autonomous power supply system according to claim 1, it is characterized in that, the capacity of monitoring unit Real-Time Monitoring lithium ion battery, the lithium ion cell charging process is adopted the constant current mode charging, adjust charging current limiter value size according to the highest single battery voltage, when single battery voltage reaches 3.65V or battery management system and judges that state-of-charge reaches 100%, stop charging.
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Cited By (7)
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| CN104701935A (en) * | 2015-02-12 | 2015-06-10 | 上海卫星装备研究所 | High-reliability mobile DC power source |
| CN107632269A (en) * | 2017-09-21 | 2018-01-26 | 孙亮 | The online charging-discharge tester system of communication storage battery |
| CN108539840A (en) * | 2018-05-04 | 2018-09-14 | 香江科技股份有限公司 | A kind of distributed DC battery power supply system |
| CN109435773A (en) * | 2017-08-31 | 2019-03-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic equipment |
| CN110676833A (en) * | 2018-07-02 | 2020-01-10 | 比亚迪股份有限公司 | Track energy feedback system and control method thereof |
| CN111525683A (en) * | 2020-04-29 | 2020-08-11 | 广东电科院能源技术有限责任公司 | Transformer substation direct-current battery device and transformer substation direct-current battery system |
| CN113777504A (en) * | 2021-08-31 | 2021-12-10 | 云南电网有限责任公司保山供电局 | Storage battery pack capacity checking system |
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| CN110676833A (en) * | 2018-07-02 | 2020-01-10 | 比亚迪股份有限公司 | Track energy feedback system and control method thereof |
| CN111525683A (en) * | 2020-04-29 | 2020-08-11 | 广东电科院能源技术有限责任公司 | Transformer substation direct-current battery device and transformer substation direct-current battery system |
| CN113777504A (en) * | 2021-08-31 | 2021-12-10 | 云南电网有限责任公司保山供电局 | Storage battery pack capacity checking system |
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