CN103117595B - Distributed direct current independent power supply system - Google Patents
Distributed direct current independent power supply system Download PDFInfo
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- CN103117595B CN103117595B CN201310082865.2A CN201310082865A CN103117595B CN 103117595 B CN103117595 B CN 103117595B CN 201310082865 A CN201310082865 A CN 201310082865A CN 103117595 B CN103117595 B CN 103117595B
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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
Current DC power-supply system; the Design Mode that generally two electricity are filled in employing three, the segmentation of 220V DC bus adds interconnection switch; direct current is powered to power consumption equipment by feed panel and point electric screen or the DC power supply subsystem be connected on DC bus being dispersed in each protective chamber via the DC bus of master-control room, and this is traditional centralized DC power-supply system.As centralized DC power-supply system; comparatively easily there is insulation to reduce or large-area multiple branch circuit ground connection simultaneously; more crucially when there is multipoint earthing in the secondary circuit being in same electrical connection; potential difference is there will be before difference; when having short trouble, differential protection malfunction or relay fail may be caused.
Chinese patent application 201110130055.0 discloses a kind of distributed DC power uninterruptible power system being unlikely to affect other equipment normal power supplies when certain part breaks down in system.This distributed DC power uninterruptible power system comprises the DC power supply subsystem that DC bus is distributed in different occasion with several, and several DC power supply subsystems described are all by DC bus forms supply network.Solve huge centralized DC power system in field of standing at present and occupy a large amount of spaces, place, it also avoid the small fault due to DC power system, have influence on the demand of the reliable power supply of all devices.
Chinese patent application 201110130055.0 obtains certain technological progress, solve that occupied ground space is little, system malfunctions time the problem such as uninterrupted power supply, but still there is following problem:
1) networking of system is powered and be there is larger distributed capacitance
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 insulation detection, causes wrong report grounding, and raise the voltage of end, works the mischief and affect the anti-electromagnetic interference capability of equipment to Electric Power Equipment Insulation.When more crucially the capacitance current of distributed capacitance generation is excessive, when there is one point earth in secondary circuit, also may cause proterctive equipment malfunction.
2) selective incubation (Graded coordination) of the superior and the subordinate's protection device can not be realized between system
DC power-supply system power supply unit is many; the distribution of feeder line branch road is wide; many branch roads are had to need to arrange circuit breaker in systems in which or fuse is protected; subsystem is linked together by DC bus by this distributed DC uninterruptible power system, can not realize selecting correct protection scheme and protection reasonable coordination between the superior and the subordinate.Cause occurring that electric power accident is magnified by overstep tripping.
3) system storage battery operating condition is uncertain
No matter be centralized DC power-supply system, or this distributed DC uninterruptible power system, batteries is in floating charge stand-by state always, if wherein there is off-capacity or the problem such as to overcharge in some storage battery, can only to be patrolled and examined by regular internal resistance and the property checked discharge and recharge detects, this detection mode real-time is poor, can not judge storage battery operating mode the very first time; In addition, problem storage battery carries out online replacing and safeguards also cumbersome, there is certain potential safety hazard.
4) system is complicated, fault point is many
This distributed DC uninterruptible power system design is comparatively complicated; DC bus is segmentation repeatedly, bus is safeguarded or is needed throw-cut multi-way switch when carrying out batteries discharge and recharge, add the fault point of system, and DC bus networking is powered easily to cause between each section of DC bus and is altered mutually, these problem points are once occur, not only power consumption equipment is caused serious harm, and operations staff is more difficult investigates in time, more can not carries out on-line maintenance.
5) effective monitoring system is lacked
Chinese patent application 201110130055.0 is that communication unit in subsystem is by RS485 or CAN or with Ethernet interface and the host computer combined network communication in field, station, the loaded down with trivial details treating capacity of information is large, lacks overall information processing and monitoring.
Summary of the invention
The object 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 is rationally divided into the direct current supply subsystem of several respective independent operating, is placed in 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 of DC buss, and described DC bus is connected with ca bin, and every two sections of adjacent DC buss are connected by switch, every two sections of adjacent DC bus configurations:
The battery pack of several parallel connections of box encapsulation, its output is connected to DC bus respectively by switch;
At least one charhing unit, for each batteries charging, and stand-by heat is given DC bus powered; And
At least one monitoring unit, be connected to communication bus, the signal measurement of direct current supply subsystem will give turn-key system and receive the electrical network power information of turn-key system, the time period of setting electrical network peak and low valley, the batteries charging time period is controlled in 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; Input and output voltage, the current information of the capacity of Real-time Collection battery pack, voltage, internal resistance, temperature and charhing unit, thus judge whether battery capacity meets power demands.
Described turn-key system comprises integrated power supply supervisory control system, main website background system, and both communicate with IEC61850 stipulations mutually; Described integrated power supply supervisory control system, main website background system are all connected to communication bus.
Described DC bus-bar voltage is 110V; Described battery pack, charhing unit and monitoring unit all support plug and play.
Described battery pack is Li-ion batteries piles or valve-controlled sealed lead-acid battery pack.
Preferably, described battery pack is Li-ion batteries piles, and adopt distributed DC power battery case to carry out box encapsulation, have active equalization system, standard connector supports big current quick charge.
Described active equalization system comprises several balanced units of cascade, realize the balanced management 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 unnecessary for battery high for SOC state, realize battery capacity to maximize, and extend the battery cyclic life-span.
Described switch is reverse-blocking tetrode thyristor device, progressively turns off under monitoring unit controls, the impulse current produced when effectively to avoid deciliter; The conversion fling-cut switch possessing sampling functions is also provided with between described battery pack and DC bus, when monitoring unit breaks down, according to the sampling of itself, conversion fling-cut switch judges whether the capacity of battery pack can also continue power supply, and realize a switching of battery pack.
The input of described charhing unit is connected to electric current inlet wire, output is connected to DC bus and each battery pack respectively by switch, and described charhing unit is the charging module that several are 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, export as DC110V; Charhing unit is at ordinary times just alternately to some Battery pack group chargings, realize online equalizing charge (degree of depth discharge and recharge, eliminate the difference between each batteries) directly do not hang on DC bus, only have when all battery pack repair and maintenances, just as charging device for subsequent use to bussed supply; When monitoring unit breaks down, can autonomous operation.
Described electric current inlet wire is the output electricity exchanging 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 is also 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 departs from bus, controls charhing unit to battery pack alternately charging by monitoring unit.
Monitoring unit is by the capacity of state-of-charge (SOC) Real-Time Monitoring lithium battery, constant current mode charging is adopted to lithium cell charging process, according to the highest single battery Voltage Cortrol charging current limiter value size, when single battery voltage reaches 3.65V or battery management system (BMS) judges that SOC reaches 100%, stop charging.
The invention has the beneficial effects as follows:
1) by after DC power-supply system cutting, each direct current subsystem independent operating, without the connection on circuit; thus the distributed capacitance at full station is diminished, the interference that system causes is weakened, during secondary circuit one point earth; the impact of capacitance discharge current is more weak, is difficult to cause false protection again.
2) each direct current subsystem independent operating, power nearby, cable length can be determined substantially, and bus, feeder line, power consumption equipment are distinct, and Graded coordination becomes very simple.
3) batteries adopts reverse-blocking tetrode thyristor device at the operating mechanism that bus upslide moves back and charhing unit moves back at bus upslide, throws when moving back functional module the process having a buffering, progressively turn off, and the impulse current to effectively prevent deciliter brings fluctuation to busbar voltage.
Li-ion batteries piles is applied directly to bus, continuous circulation carry out discharge and recharge, the performance of battery and health status inform operations staff in real time by the monitoring of monitoring unit, and battery hidden danger can find ahead of time process ahead of time, be in floating charge stand-by state, battery status is uncertain no longer always.
Lithium ion battery is mainly used in the new energy field such as electric automobile, photovoltaic energy storage at present in power industry; Be in the starting stage in the application of transformer station, choice for use of the present invention lithium ion battery, compared with the valve-controlled sealed lead-acid battery, advantage is given prominence to:
1. extra long life, the cycle life of valve-controlled sealed lead-acid battery is the highest only has 500 times, and cycle life of lithium ion battery reaches more than 2000 times.
2. can big current 2C fast charging and discharging, and valve-controlled sealed lead-acid battery is now without this performance.
3. lithium ion battery operating temperature range broadness (﹣ 20 DEG C ~ ﹢ 75 DEG C).
4. lithium ion battery volume is little, and capacity is large.
5. lithium ion battery can with fill with, first need not discharge and recharge.
6. environmental protection.Lithium ion battery is not containing any heavy metal and rare metal, nontoxic, pollution-free, is absolute environmental protection battery.
Lithium ion battery adopts box encapsulation technology, and standard interface is connected to system.Monitoring unit controls according to set charging strategy and control strategy the discharge and recharge that charhing unit alternately completes all battery pack automatically, and information and the current running status (BMS) such as capacity, voltage, internal resistance, temperature of 24 hours all battery pack of real time on-line monitoring, and these data are formed monthly accounting logging for operations staff's reference.When there being any Battery pack group not reach service requirement, monitoring unit realizes battery pack throwing by controlling reverse-blocking tetrode thyristor device is moved back.
DC bus or charhing unit also can introduce solar energy, wind energy charging in some particular locality, make DC power-supply system become a free of contamination clear energy sources system of complete environmental protection.
4) distributed DC autonomous power supply system, eliminates the association of DC bus between each power consumption equipment, has effectively evaded the problem that DC bus is altered mutually.Between direct current subsystem to power consumption equipment, cable length shortens, and sectional area of wire can be ignored the decay of power transmission signal, and DC bus directly can be depressured to 110V, drives the low pressure miniature circuit breaker electric pressure at full station to lower, improves economy.
Battery pack, charhing unit and monitoring unit all support plug and play, 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, each functional module externally all adopt unified standard electrically and physical interface, all support plug and play, after arbitrary functional module breaks down, spare part is all convenient to be replaced; Reduce the impact that fault is brought system cloud gray model, the malfunctioning module of replacing can carry out off-line type maintenance.
5) in system, the monitor and forecast strategy of monitoring unit to charhing unit and the module such as battery case that possesses active equalization system completes automatically, without the need to manual intervention, after going wrong, system can timely alert notice operations staff process, and is applicable to unattended operation transformer station completely.Monitoring unit is by the capacity of SOC Real-Time Monitoring lithium ion battery, constant current mode charging is adopted to lithium cell charging process, according to the highest single battery Voltage Cortrol charging current limiter value size, single battery voltage reach 3.65V or BMS judge SOC reach 100% time, stop charging.Monitoring unit is to the multiple stipulations communication of upper support, possess, by the various information in real-time detecting system, intellectual analysis is carried out to direct current subsystem, the senior application such as hidden danger anticipation, and analysis result is formed monthly form submission user, assisting users realizes the management of system.
The operation of power networks floor data that monitoring unit gets according to turn-key system carries out intellectual analysis, judge peak period and the low ebb phase of electrical network electricity consumption, selection to battery charge time section is taked control, or the time period of peak and low valley is manually set by artificial judgment, avoid charging to battery in peak times of power consumption, battery charge time section is controlled, in the low power consumption phase, electrical network is played to the effect in peak clipping Pinggu.
The direct current supply subsystem of turn-key system and independent operating is all connected to communication bus, and information exchange is convenient and swift, overall effectively can control the normal operation of all subsystems.
Accompanying drawing explanation
Fig. 1 is the structural representation of Traditional DC electric power 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 diagram;
Fig. 6 is embodiment 3 direct current subsystem structure schematic diagram;
Fig. 7 is embodiment 4 direct current subsystem structure schematic diagram;
Fig. 8 is embodiment 5 direct current subsystem structure schematic diagram;
Fig. 9 is embodiment 6 direct current subsystem structure schematic diagram;
Figure 10 is embodiment 7 direct current subsystem structure schematic diagram;
Figure 11 is embodiment 8 direct current subsystem structure schematic diagram;
Figure 12 is embodiment 9 direct current subsystem structure schematic diagram;
Figure 13 is the circuit diagram of active equalization system.
Embodiment
Below in conjunction with drawings and Examples, the present invention will be further elaborated, should be noted that following explanation is only to explain the present invention, not limiting its content.
The present invention is applicable to all systems needing direct current supply such as power station, transformer station, current conversion station.
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 of DC buss, and described DC bus is connected with ca bin, and every two sections of adjacent DC buss are connected by switch, every two sections of adjacent DC bus configurations:
The battery pack of several parallel connections of box encapsulation, its output is connected to DC bus respectively by switch;
At least one charhing unit, for each batteries charging, and stand-by heat is given DC bus powered; And
At least one monitoring unit, be connected to communication bus, the signal measurement of direct current supply subsystem will give turn-key system and receive the electrical network power information of turn-key system, the time period of setting electrical network peak and low valley, the batteries charging time period is controlled in 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; Input and output voltage, the current information of the capacity of Real-time Collection battery pack, voltage, internal resistance, temperature and charhing unit, thus judge whether battery capacity meets power demands.
Described turn-key system comprises integrated power supply supervisory control system, main website background system, and both communicate with IEC61850 stipulations mutually; Described integrated power supply supervisory control system, main website background system are all connected to communication bus.
Described DC bus-bar voltage is 110V; Described battery pack, charhing unit and monitoring unit all support plug and play.
Described battery pack is Li-ion batteries piles or valve-controlled sealed lead-acid battery pack.
Preferably, described battery pack is Li-ion batteries piles, and adopt distributed DC power battery case to carry out box encapsulation, have active equalization system, standard connector supports big current quick charge.
Described active equalization system comprises several balanced units of cascade, realize the balanced management 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 unnecessary for battery high for SOC state, realize battery capacity to maximize, and extend the battery cyclic life-span.
Described switch is reverse-blocking tetrode thyristor device, progressively turns off under monitoring unit controls, the impulse current produced when effectively to avoid deciliter; The conversion fling-cut switch possessing sampling functions is also provided with between described battery pack and DC bus, when monitoring unit breaks down, according to the sampling of itself, conversion fling-cut switch judges whether the capacity of battery pack can also continue power supply, and realize a switching of battery pack.
The input of described charhing unit is connected to electric current inlet wire, output is connected to DC bus and each battery pack respectively by switch, and described charhing unit is the charging module that several are 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, export as DC110V; Charhing unit is at ordinary times just alternately to some Battery pack group chargings, realize online equalizing charge (degree of depth discharge and recharge, eliminate the difference between each batteries) directly do not hang on DC bus, only have when all battery pack repair and maintenances, just as charging device for subsequent use to bussed supply; When monitoring unit breaks down, can autonomous operation.
Described electric current inlet wire is the output electricity exchanging 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 is also 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 departs from bus, controls charhing unit to battery pack alternately charging by monitoring unit.
Monitoring unit is by the capacity of state-of-charge (SOC) Real-Time Monitoring lithium battery, constant current mode charging is adopted to lithium cell charging process, according to the highest single battery Voltage Cortrol charging current limiter value size, when single battery voltage reaches 3.65V or battery management system (BMS) judges that SOC reaches 100%, stop charging.
Below the concrete case study on implementation of each direct current subsystem:
Embodiment 1
Direct current subsystem as shown in Figure 4 comprises one section of DC bus, and DC bus is connected with ca bin, and this DC bus configures: 1# battery pack in parallel and 2# battery pack, a charhing unit and a monitoring unit.
When 1# is battery-powered, during 2# batteries charging, K switch 1, K switch 4 disconnect, and K switch 2, K switch 3 close; When 2# batteries charging is complete, K switch 3 disconnects, and 2# battery pack is in hot standby state.When 1# battery electric quantity is not enough, system transfers to by the battery-powered 1# batteries charging of 2# automatically, now, K switch 1, K switch 4 close, and then K switch 2 disconnects, and charhing unit is to 1# batteries charging, complete K switch 1 of charging disconnects, and 1# battery pack is in hot standby state.
If charhing unit occurs abnormal, K switch 3, K switch 4 close 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 closes, by charhing unit to bussed supply.Extremely, monitoring unit has alert notice backstage and control centre simultaneously, and arrangement personnel process in time for charhing unit and any one appearance of battery pack.
K switch 1 ~ K5 is reverse-blocking tetrode thyristor device, can progressively turn off under monitoring unit controls, the impulse current produced when can effectively to avoid deciliter.
Charhing unit is at ordinary times just alternately to two Battery pack chargings, realize online equalizing charge (degree of depth discharge and recharge, 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 close, and charhing unit is given DC bus powered as charging device for subsequent use.
Electric current inlet wire is for exchanging inlet wire.
Battery pack adopts lithium battery, supports big current quick charge.Charhing unit adopts AC/DC charging module.
Embodiment 2
Unique not being both compared with embodiment 1 of direct current subsystem as shown in Figure 5: every group storage battery is connected on bus by two groups of reverse-blocking tetrode thyristor devices, for subsequent use each other, increases the reliability of bus.
Embodiment 3
Unique not being both compared with embodiment 1 of direct current subsystem as shown in Figure 6: system adds 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, the mode of 2 × 2 carries out alternately dropping into, charhing unit, to charging successively to 2 group storage batteries departed from respectively, increases the reliability of battery pack.
Embodiment 4
Unique not being both compared with embodiment 1 of direct current subsystem as shown in Figure 7: introduce the clear energy sources that solar energy, wind energy etc. are new, on the one hand, when solar energy, wind energy resources abundance, directly by DC bus power supply to the device, K switch 6 is connected, charhing unit and battery pack are all in hot standby state, drop into battery pack when solar energy, wind energy resources deficiency.
On the other hand, charhing unit directly can be got alternating current from electrical network and convert direct current to batteries charging, also directly can introduce solar energy, wind energy convert stable direct current to batteries charging.
Embodiment 5
Unique not being both compared with embodiment 1 of direct current subsystem as shown in Figure 8: add conversion fling-cut switch between two Battery pack groups to DC bus, conversion fling-cut switch possesses sampling functions, when monitoring unit breaks down, according to the sampling of itself, conversion fling-cut switch can judge whether the capacity of battery pack can also continue power supply, and carry out a switching of battery pack.
Embodiment 6
Direct current subsystem as shown in Figure 9 comprises two sections of DC buss, DC bus is connected with ca bin, two sections of DC buss are connected by interconnection switch, and every section of DC bus configuration is identical with embodiment 1, and just two sections of bus four group storage batteries share a set of charhing unit and monitoring unit.Monitoring unit detects the operating condition of batteries simultaneously, and charhing unit gives four Battery pack group chargings successively.
Embodiment 7
Unique not being both compared with embodiment 6 of direct current subsystem as shown in Figure 10: every section of bus belt charhing unit separately, two sections of buses still share a set of monitoring unit.
Embodiment 8
Direct current subsystem as shown in figure 11 comprises one section of DC bus, and DC bus is connected with ca bin, and this DC bus configures: a lead acid accumulator battery pack, a charhing unit, and at least one monitoring unit; 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 floating charge stand-by state.
Embodiment 9
Direct current subsystem as shown in figure 12 comprises one section of DC bus, DC bus is connected with ca bin, this DC bus configures: a monitoring unit, several lead acid accumulator battery pack and the charhing unit coordinated with each lead-acid batteries, and charhing unit input is for exchanging inlet wire.
Single-unit 12V special charging unit charging, boosts to 110V with increasing apparatus, is parallel on bus and uses.During normal operation, the output of charhing unit directly outputs to bus power supply to the device by increasing apparatus, and battery is in floating charge stand-by state.
Embodiment 1 ~ 9 can need independent assortment according to actual design, to meet more complicated system requirements.
By reference to the accompanying drawings the specific embodiment of the present invention is described although above-mentioned; but 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 amendment or distortion that creative work can make still within protection scope of the present invention.
Claims (8)
1. a distributed DC autonomous power supply system, is characterized in that, it comprises communication bus and difference
The direct current supply subsystem of connected turn-key system and several independent operatings; Each direct current supply subsystem includes some sections of DC buss, described DC bus is connected with ca bin, every two sections of adjacent DC buss are connected by switch, every two sections of adjacent DC bus configurations: the battery pack of several parallel connections of box encapsulation, its output is connected to DC bus respectively by switch;
At least one charhing unit, for each batteries charging, and stand-by heat is given DC bus powered;
And at least one monitoring unit, be connected to communication bus, the signal measurement of direct current supply subsystem will give turn-key system and receive the electrical network power information of turn-key system, the time period of setting electrical network peak and low valley, the batteries charging time period is controlled in 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; Input and output voltage, the current information of the capacity of Real-time Collection battery pack, voltage, internal resistance, temperature and charhing unit, thus judge whether battery capacity meets power demands;
Monitoring unit controls according to set charging strategy and control strategy the discharge and recharge that charhing unit alternately completes all battery pack automatically, and the capacity of 24 hours all battery pack of real time on-line monitoring, voltage, internal resistance, temperature information and current running status, and these data are formed monthly accounting logging for operations staff's reference, when there being any Battery pack group not reach service requirement, monitoring unit realizes battery pack throwing by controlling reverse-blocking tetrode thyristor device is moved back;
Described battery pack is Li-ion batteries piles, distributed DC power battery case is adopted to carry out box encapsulation, there is active equalization system, described active equalization system comprises several balanced units of cascade, realized the balanced management to multi-section series lithium ionic cell, the state-of-charge difference between adjacent two joint cells is judged, and is delivered in the lower single battery of SOC unnecessary for battery high for SOC state, realize battery capacity to maximize, and extend the battery cyclic life-span.
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 with IEC61850 stipulations mutually; Described integrated power supply supervisory control system, main website background system are all 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 all support 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 1, it is characterized in that, described switch is reverse-blocking tetrode thyristor device, progressively turns off under monitoring unit controls; Also be provided with the conversion fling-cut switch possessing sampling functions between described battery pack and DC bus, when monitoring unit breaks down, judge whether the capacity of battery pack can also continue power supply according to the sampling of itself, and realize a switching of battery pack.
6. 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 DC bus and each battery pack respectively by switch, described charhing unit is the charging module that several are connected in parallel, freely throw according to field condition and move back, export as DC110V.
7. a kind of distributed DC autonomous power supply system according to claim 6, it is characterized in that, described electric power incoming line is the output electricity exchanging 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 is also connected to DC bus by switch.
8. 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, constant current mode charging is adopted to lithium ion cell charging process, according to the highest single battery Voltage Cortrol charging current limiter value size, when single battery voltage reaches 3.65V or battery management system judges that state-of-charge reaches 100%, stop charging.
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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 |
| CN109435773B (en) * | 2017-08-31 | 2022-02-08 | 比亚迪股份有限公司 | Battery equalization method, system, vehicle, storage medium and electronic device |
| CN107632269A (en) * | 2017-09-21 | 2018-01-26 | 孙亮 | The online charging-discharge tester system of communication storage battery |
| CN108539840B (en) * | 2018-05-04 | 2020-06-12 | 香江科技股份有限公司 | Distributed direct-current battery power supply system |
| CN110676833B (en) * | 2018-07-02 | 2021-12-07 | 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 |
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| CN102231613A (en) * | 2011-06-29 | 2011-11-02 | 湖南大学 | Distributed photovoltaic generating and building cold and heat source coupling system |
| CN102290841A (en) * | 2011-08-13 | 2011-12-21 | 罗俊亚 | Peak clipping and valley filling electric vehicle swapping station for distribution network |
| CN102832653A (en) * | 2011-12-29 | 2012-12-19 | 中航锂电（洛阳）有限公司 | Active equalization circuit for multi-monomer series battery |
| CN203119615U (en) * | 2013-03-15 | 2013-08-07 | 山东鲁能智能技术有限公司 | Distributed direct-current independent power supply system |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5208374B2 (en) * | 2006-04-18 | 2013-06-12 | シャープ株式会社 | Grid interconnection power conditioner and grid interconnection power system |
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Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201576956U (en) * | 2009-10-30 | 2010-09-08 | 河南红宇特种汽车有限公司 | Emergency DC power supply vehicle |
| CN102231613A (en) * | 2011-06-29 | 2011-11-02 | 湖南大学 | Distributed photovoltaic generating and building cold and heat source coupling system |
| CN102290841A (en) * | 2011-08-13 | 2011-12-21 | 罗俊亚 | Peak clipping and valley filling electric vehicle swapping station for distribution network |
| CN102832653A (en) * | 2011-12-29 | 2012-12-19 | 中航锂电（洛阳）有限公司 | Active equalization circuit for multi-monomer series battery |
| CN203119615U (en) * | 2013-03-15 | 2013-08-07 | 山东鲁能智能技术有限公司 | Distributed direct-current independent power supply system |
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