CN203119617U - Distributed direct-current independent power supply system for transformer substation - Google Patents
Distributed direct-current independent power supply system for transformer substation Download PDFInfo
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- CN203119617U CN203119617U CN 201320119672 CN201320119672U CN203119617U CN 203119617 U CN203119617 U CN 203119617U CN 201320119672 CN201320119672 CN 201320119672 CN 201320119672 U CN201320119672 U CN 201320119672U CN 203119617 U CN203119617 U CN 203119617U
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Abstract
The utility model discloses a distributed direct-current independent power supply system for a transformer substation. According to the distributed direct-current independent power supply system for the transformer substation, the direct-current independent power supply system is reasonably divided into a plurality of direct-current power supply systems capable of operating independently according to the layout plan of the transformer substation and necessary electricity amount of electric equipment, and the direct-current power supply systems are arranged at positions near the electric equipment. The distributed direct-current independent power supply system for the transformer substation comprises a transformer substation communication bus, a main control system and a plurality of direct-current power supply sub-systems capable of operating independently, wherein the main control system and the direct-current power supply sub-systems are connected with the transformer substation communication bus, each direct-current power supply sub-system is composed of a main-control room sub-system, a GIS equipment sub-system, an intelligent terminal cabinet sub-system, a merging unit cabinet sub-system and protective room sub-systems according to areas, the protective room sub-systems are distributed in all the areas of the transformer substation, each direct-current power supply sub-system comprises a plurality of sections of direct-current buses, each section of direct-current bus is connected with a feeder line terminal unit, every two adjacent sections of direct-current buses are connected through a switch, and a plurality of box type packaged lithium-ion battery packs connected in parallel, at least one charging unit and at least one monitoring unit are configured on every two adjacent sections of direct-current buses.
Description
Technical field
The utility model relates to a kind of distributed DC autonomous power supply system, particularly a kind of distributed DC autonomous power supply system for transformer station.
Background technology
Present DC power-supply system; especially the intelligent substation of 220kV and above electric pressure; DC power-supply system adopts 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 the branch electric screen that is dispersed in each protection cell or the DC power supply subsystem that is connected on the dc bus via the dc bus of master-control room, and this is traditional centralized DC power-supply system.As centralized DC power-supply system; insulation reduction or large-area multiple branch circuit ground connection is simultaneously easily taken place; more crucial is when multipoint earthing occurring in being in the same secondary circuit that is electrically connected; the meeting appearance potential is poor before the difference; when short trouble is arranged, may cause differential protection malfunction or protection tripping.
Chinese patent application 201110130055.0 discloses a kind of when certain part breaks down in the system and be unlikely to influence 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 constituting supply network on the dc bus.Solve centralized DC power system huge in the field, present station and taken a large amount of spaces, place, also avoided the small fault owing 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 little, the problem such as uninterrupted power supply when system breaks down in occupied ground space, but still has had following problem:
1) there is bigger distributed capacitance in the networking of system power supply
The design of this distributed DC uninterruptible power system supply networkization can increase distributed capacitance.Distributed capacitance makes circuit be capacitive when circuit is unloaded, and crossing conference influence the precision that the branch road insulation detects, and causes wrong report branch road ground connection, and raises terminal voltage, the anti-electromagnetic interference capability that power equipment is insulated and works the mischief and influence equipment.When more crucial is capacitance current that distributed capacitance produces is excessive, when one point earth occurring in the secondary circuit, also may cause the protection equipment malfunction.
2) selectivity that can not realize the superior and the subordinate's protection device between system cooperates (differential cooperation)
The DC power-supply system power supply unit is many; the feeder line branch road distributes wide; in system, there are many branch roads need circuit breaker be set 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 cooperation 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 centralized DC power-supply system, or this distributed DC uninterruptible power system, hold the lithium ion battery group and be in the floating charge stand-by state always, if wherein some storage battery off-capacity occurs or 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 make judgement to the storage battery operating mode; In addition, it is also cumbersome that the problem storage battery carries out online replacing maintenance, has certain potential safety hazard.
4) system's design 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 held needs the switching variable connector when lithium ion battery group discharges and recharges, increased the fault point of system, and dc bus networking power supply easily causes between each section of dc bus scurries mutually, these problem points are in case occur, not only power consumption equipment is caused serious harm, and the operations staff difficulty in time investigate, more can not carry out on-line maintenance.
5) lack effective monitoring system
Chinese patent application 201110130055.0 is that the communication unit in the subsystem passes through RS485 or CAN bus or with the host computer combined network communication in Ethernet interface and the field, station, the loaded down with trivial details treating capacity of information is big, information processing and the monitoring of shortage integral body.
Summary of the invention
The purpose of this utility model is for overcoming above-mentioned the deficiencies in the prior art; a kind of distributed DC autonomous power supply system for transformer station is provided; DC power-supply system will be broken the whole up into parts; according to the allocation plan of transformer station and the desired volume of power consumption equipment (protection equipment, GIS equipment, merge cells, intelligent terminal etc.); DC power-supply system is divided into the direct current supply subsystem of several independent operatings separately according to the reasonable quantity of the classification of power consumption equipment and installation site or transformer station's cell, is placed in the power consumption equipment place nearby.
For achieving the above object, the utility model adopts following technical proposals:
A kind of distributed DC autonomous power supply system for transformer station, it comprises the direct current supply subsystem of transformer substation communication bus and the connected turn-key system of difference and several independent operatings, the protection cell subsystem that described direct current supply subsystem is divided into master-control room subsystem, GIS equipment subsystem, intelligent terminal cabinet systems, merge cells cabinet systems and is distributed in each zone of transformer station according to the zone; Adjust each direct current supply subsystem desired volume, the capacity of each direct current supply subsystem can be by 10Ah, 30Ah, these three kinds of standard specification combinations of 50Ah; Each direct current supply subsystem includes some sections dc buss, and described dc bus is connected with the line feed terminals unit, and per two sections adjacent dc buss connect by switch, per two sections adjacent dc bus configurations:
The lithium ion battery group that several of box encapsulation are in parallel, its output is connected to dc bus by switch respectively;
At least one charhing unit be used for each lithium ion battery group charging, and stand-by heat is given DC bus powered; And
At least one monitoring unit, be connected to the transformer substation communication bus, give turn-key system on the 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, lithium ion battery group charging interval section was controlled in the low power consumption phase, with to electrical network peak clipping Pinggu, the control charhing unit is to the alternately charging of each lithium ion battery group, and controls at least one lithium ion battery group and be communicated with dc bus; Gather input and output voltage, the current information of capacity, voltage, internal resistance, temperature and the charhing unit of lithium ion battery group in real time, thereby judge whether the lithium ion battery pool-size satisfies power demands.
Described transformer station is any in conventional substation, digital transformer substation and the intelligent transformer station.
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 the transformer substation communication bus.
Described DC bus-bar voltage is 110V; Described lithium ion battery group, charhing unit and monitoring unit are all supported plug and play.
Described lithium ion battery group adopts distributed DC power-supply battery case to carry out box encapsulation, has initiatively equalizing system, the big electric current quick charge of standard connector support.
Described active equalizing system comprises several balanced units of cascade, realization is to the balanced management of multi-section series lithium ionic cell, state-of-charge difference between the adjacent two joint cells is judged, and be delivered in the lower single battery of SOC the high battery of SOC state is unnecessary, the maximization of realization battery capacity, and prolong lithium ion battery group cycle life.
Described switch is the reverse-blocking tetrode thyristor device, progressively turn-offs under monitoring unit control, effectively avoids the impulse current of the fashionable generation of branch; Also be provided with between described lithium ion battery group and the dc bus and possess sampling function conversion fling-cut switch, when monitoring unit breaks down, the conversion fling-cut switch judges according to the sampling of itself whether the capacity of lithium ion battery group can also continue power supply, and realizes a switching of lithium ion battery group.
The input of described charhing unit is connected to the electric current inlet wire, output is connected to dc bus and each lithium ion battery group respectively 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 to move back, be output as DC110V; Charhing unit is just alternately given some groups of lithium ion battery group chargings at ordinary times, (degree of depth discharges and recharges to realize online equalizing charge, eliminate the difference between each batteries) directly do not hang on the dc bus, have only when all lithium ion battery group repair and maintenances, just give bussed supply as standby charging device; 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 the operation, the lithium ion battery group alternately hangs on the dc bus and powers to power consumption equipment, and charhing unit breaks away from bus heat and is equipped with, and controls charhing unit by monitoring unit the lithium ion battery group is replaced charging.
Monitoring unit is monitored the capacity of lithium battery in real time by state-of-charge (SOC), 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, reach 3.65V or battery management system (BMS) at single battery voltage and judge that SOC reaches at 100% o'clock, stop charging.
The beneficial effects of the utility model are:
1) after the DC power-supply system cutting with transformer station, each direct current subsystem independent operating, the connection on the no 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.
The lithium ion battery group directly is applied 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 handle 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 new energy fields such as electric automobile, photovoltaic energy storage at present in power industry; Application in transformer station is in the starting stage, and the utility model is selected to have used lithium ion battery, compares with the valve-controlled sealed lead-acid battery, and advantage is outstanding:
1. extra long life, the cycle life of valve-controlled sealed lead-acid battery is the highest to be had only 500 times, and lithium ion battery cycle life reaches more than 2000 times.
2. electric current 2C fast charging and discharging greatly, and the valve-controlled sealed lead-acid battery does not have this performance now.
3. lithium ion battery operating temperature range broadness (75 ℃ of 20 ℃～﹢ of ﹣).
4. the lithium ion battery volume is little, and capacity is big.
5. lithium ion battery can be with filling with usefulness, need not put earlier 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 controlled charhing unit automatically according to set charging strategy and control strategy and is alternately finished discharging and recharging of all battery pack, and information and 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 these data are formed monthly accounting logging for operations staff's reference.When any Battery pack group did not reach service requirement, monitoring unit moved back by the throwing of control reverse-blocking tetrode thyristor device realization battery pack.
Dc bus or charhing unit also can be introduced solar energy, wind energy charging in some particular locality, make the DC power-supply system of transformer station become the free of contamination clear energy sources of a complete environmental protection system.
4) the distributed DC autonomous power supply system of transformer station has been eliminated the association of dc bus between each power consumption equipment, has effectively evaded the problem that dc bus is scurried 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, drives the low pressure miniature circuit breaker electric pressure downward modulation at full station, 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 the box encapsulation also as a functional module, building of direct current subsystem is exactly the process of a module assembling, 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 influence that operation brings to system, the malfunctioning module of replacing can carry out the off-line type maintenance.
5) monitoring unit is finished automatically to charhing unit and monitoring and the control strategy of the modules such as battery case that possess the active equalizing system in the system, need not manual intervention, the back system that goes wrong can timely alert notice operations staff handle, and is applicable to unattended operation transformer station fully.Monitoring unit can be monitored the capacity of lithium ion battery in real time by SOC, 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, reach 3.65V or BMS judges that SOC reaches at 100% o'clock at single battery voltage, stop charging.Monitoring unit is to the multiple stipulations communication of last support, possess by the various information in the real-time detecting system direct current subsystem is carried out intellectual analysis, senior application such as hidden danger anticipation, and analysis result is formed monthly form submit the user to, 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, the selection of battery charge time period is being taked control, perhaps manually set the time period of peak and low valley by artificial judgment, avoid peak times of power consumption to battery charge, the control of battery charge time period in the low power consumption phase, is played the effect in peak clipping Pinggu to electrical network.
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 control the normal operation of all subsystems effectively.
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 utility model;
Fig. 3 is communications rack composition of the present utility model;
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 the circuit diagram of active equalizing system.
Embodiment
Below in conjunction with drawings and Examples the utility model is further set forth, should be noted that following explanation only is in order to explain the utility model, its content not to be limited.
A kind of distributed DC autonomous power supply system for transformer station, it comprises the direct current supply subsystem of transformer substation communication bus and the connected turn-key system of difference and several independent operatings, the protection cell subsystem that described direct current supply subsystem is divided into master-control room subsystem, GIS equipment subsystem, intelligent terminal cabinet systems, merge cells cabinet systems and is distributed in each zone of transformer station according to the zone; Adjust each direct current supply subsystem desired volume, the capacity of each direct current supply subsystem can be by 10Ah, 30Ah, these three kinds of standard specification combinations of 50Ah; Each direct current supply subsystem includes some sections dc buss, and described dc bus is connected with the line feed terminals unit, and per two sections adjacent dc buss connect by switch, per two sections adjacent dc bus configurations:
The lithium ion battery group that several of box encapsulation are in parallel, its output is connected to dc bus by switch respectively;
At least one charhing unit be used for each lithium ion battery group charging, and stand-by heat is given DC bus powered; And
At least one monitoring unit, be connected to the transformer substation communication bus, give turn-key system on the 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, lithium ion battery group charging interval section was controlled in the low power consumption phase, with to electrical network peak clipping Pinggu, the control charhing unit is to the alternately charging of each lithium ion battery group, and controls at least one lithium ion battery group and be communicated with dc bus; Gather input and output voltage, the current information of capacity, voltage, internal resistance, temperature and the charhing unit of lithium ion battery group in real time, thereby judge whether the lithium ion battery pool-size satisfies power demands.
Described transformer station is any in conventional substation, digital transformer substation and the intelligent transformer station.
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 the transformer substation communication bus.
The protection cell subsystem that described direct current supply subsystem comprises master-control room subsystem, GIS equipment subsystem, intelligent terminal cabinet systems, merge cells cabinet systems and is distributed in each zone of transformer station; Adjust each direct current supply subsystem desired volume, the capacity of each direct current supply subsystem can be by 10Ah, 30Ah, these three kinds of standard specification combinations of 50Ah.
Described DC bus-bar voltage is 110V; Described lithium ion battery group, charhing unit and monitoring unit are all supported plug and play.
Described lithium ion battery group is lithium ion battery group or valve-controlled sealed lead-acid lithium ion battery group.
Preferably, described lithium ion battery group is the lithium ion battery group, adopts distributed DC power-supply battery case to carry out box encapsulation, has initiatively equalizing system, the big electric current quick charge of standard connector support.
Described active equalizing system comprises several balanced units of cascade, realization is to the balanced management of multi-section series lithium ionic cell, state-of-charge difference between the adjacent two joint cells is judged, and be delivered in the lower single battery of SOC the high battery of SOC state is unnecessary, the maximization of realization battery capacity, and prolong lithium ion battery group cycle life.
Described switch is the reverse-blocking tetrode thyristor device, progressively turn-offs under monitoring unit control, effectively avoids the impulse current of the fashionable generation of branch; Also be provided with between described lithium ion battery group and the dc bus and possess sampling function conversion fling-cut switch, when monitoring unit breaks down, the conversion fling-cut switch judges according to the sampling of itself whether the capacity of lithium ion battery group can also continue power supply, and realizes a switching of lithium ion battery group.
The input of described charhing unit is connected to the electric current inlet wire, output is connected to dc bus and each lithium ion battery group respectively 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 to move back, be output as DC110V; Charhing unit is just alternately given some groups of lithium ion battery group chargings at ordinary times, (degree of depth discharges and recharges to realize online equalizing charge, eliminate the difference between each batteries) directly do not hang on the dc bus, have only when all lithium ion battery group repair and maintenances, just give bussed supply as standby charging device; 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 the operation, the lithium ion battery group alternately hangs on the dc bus and powers to power consumption equipment, and charhing unit breaks away from bus heat and is equipped with, and controls charhing unit by monitoring unit the lithium ion battery group is replaced charging.
Monitoring unit is monitored the capacity of lithium battery in real time by state-of-charge (SOC), 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, reach 3.65V or battery management system (BMS) at single battery voltage and judge that SOC reaches at 100% o'clock, stop charging.
Below be 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# lithium ion battery group and 2# lithium ion battery group, a charhing unit and a monitoring unit in parallel.
When the power supply of 1# lithium ion battery group, during the charging of 2# lithium ion battery group, K switch 1, K switch 4 disconnect K switch 2, K switch 3 closures; K switch 3 disconnected when the charging of 2# lithium ion battery group finished, and 2# lithium ion battery group is in heat and is equipped with state.When 1# lithium ion battery group electric weight is not enough, system transfers to automatically by the charging of 2# lithium ion battery group power supply 1# lithium ion battery group, at this moment, K switch 1, K switch 4 closures, K switch 2 disconnects then, charhing unit charges to 1# lithium ion battery group, K switch 1 disconnection that finishes of charging, and 1# lithium ion battery group is in heat and is equipped with state.
Occur unusually as if charhing unit, K switch 3, K switch 4 be closure simultaneously, and two groups of lithium ion battery groups are simultaneously to DC bus powered, and power-on time prolongs one times.
If the lithium ion battery group occurs unusual, K switch 5 closures are given bussed supply by charhing unit.Any one occurs charhing unit and lithium ion battery group unusually, and monitoring unit has alert notice backstage and control centre simultaneously, and arrangement personnel in time handle.
Charhing unit is just alternately given the charging of two Battery packs at ordinary times, (degree of depth discharges and recharges to realize online equalizing charge, eliminate the difference between each batteries) directly do not hang on the 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.
The lithium ion battery group adopts lithium battery, supports big 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 the 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# lithium ion battery group and this two group storage battery of 4# lithium ion battery group more, two group storage batteries hang on the bus simultaneously and power during normal the operation, 2 * 2 mode replaces input, charhing unit increases the reliability of lithium ion battery group 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 new clear energy sources such as solar energy, wind energy, on the one hand, under the situation of solar energy, wind energy resources abundance, directly give power devices by dc bus, K switch 6 is connected, charhing unit and lithium ion battery group all are in heat and are equipped with state, drop into the lithium ion battery group under the situation of solar energy, wind energy resources deficiency.
On the other hand, charhing unit can directly be got alternating current from electrical network and convert direct current to the charging of lithium ion battery group, also can directly introduce solar energy, wind energy and convert stable direct current to and charge to the lithium ion battery group.
Embodiment 5
Direct current subsystem is as shown in Figure 8 compared unique not being both with embodiment 1: two groups of lithium ion battery groups are to having increased the conversion fling-cut switch between the dc bus, the conversion fling-cut switch possesses the sampling function, when monitoring unit breaks down, the conversion fling-cut switch can judge whether the capacity of lithium ion battery group can also continue power supply according to the sampling of itself, and carries out a switching of lithium ion battery group.
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 that holds the lithium ion battery group simultaneously, and charhing unit is given four groups of lithium ion battery group chargings successively.
Embodiment 7
Direct current subsystem is as shown in figure 10 compared unique not being both with embodiment 6: every section bus band charhing unit separately, two sections buses still share a cover monitoring unit.
Though above-mentionedly by reference to the accompanying drawings embodiment of the present utility model is described; but be not the restriction to the utility model protection range; on the basis of the technical solution of the utility model, those skilled in the art do not need to pay various modifications that creative work can make or distortion still in protection range of the present utility model.
Claims (9)
1. distributed DC autonomous power supply system that is used for transformer station, it is characterized in that, it comprises the direct current supply subsystem of transformer substation communication bus and the connected turn-key system of difference and several independent operatings, the protection cell subsystem that described direct current supply subsystem is divided into master-control room subsystem, GIS equipment subsystem, intelligent terminal cabinet systems, merge cells cabinet systems and is distributed in each zone of transformer station according to the zone; Each direct current supply subsystem includes some sections dc buss, and described dc bus is connected with the line feed terminals unit, and per two sections adjacent dc buss connect by switch, per two sections adjacent dc bus configurations:
The lithium ion battery group that several of box encapsulation are in parallel, its output is connected to dc bus by switch respectively;
At least one charhing unit be used for each lithium ion battery group charging, and stand-by heat is given DC bus powered; And
At least one monitoring unit, be connected to the transformer substation communication bus, give turn-key system on the 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, lithium ion battery group charging interval section was controlled in the low power consumption phase, with to electrical network peak clipping Pinggu, the control charhing unit is to the alternately charging of each lithium ion battery group, and controls at least one lithium ion battery group and be communicated with dc bus; Gather input and output voltage, the current information of capacity, voltage, internal resistance, temperature and the charhing unit of lithium ion battery group in real time, thereby judge whether the lithium ion battery pool-size satisfies power demands.
2. a kind of distributed DC autonomous power supply system according to claim 1 is characterized in that, described transformer station is any in conventional substation, digital transformer substation and the intelligent transformer station.
3. 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 the transformer substation communication bus.
4. a kind of distributed DC autonomous power supply system according to claim 1 is characterized in that, DC bus-bar voltage is 110V; Described lithium ion battery group, charhing unit and monitoring unit are all supported plug and play.
5. a kind of distributed DC autonomous power supply system according to claim 1 is characterized in that, described lithium ion battery group adopts distributed DC power-supply battery case to carry out box encapsulation, has initiatively equalizing system, the big electric current quick charge of standard connector support; Described active equalizing system comprises several balanced units of cascade, realization is to the balanced management of multi-section series lithium ionic cell, state-of-charge difference between the adjacent two joint cells is judged, and be delivered in the lower single battery of SOC the high battery of SOC state is unnecessary, the maximization of realization battery capacity, and prolong lithium ion battery group 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 control; Also be provided with between described lithium ion battery group and the dc bus and possess sampling function conversion fling-cut switch, when monitoring unit breaks down, judge according to the sampling of itself whether the capacity of lithium ion battery group can also continue power supply, and realize a switching of lithium ion battery group.
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 dc bus and each lithium ion battery group respectively by switch, described charhing unit is several charging modules that is connected in parallel, freely throw according to field condition and to 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 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, monitoring unit is monitored the capacity of lithium ion battery in real time, 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, reach 3.65V or battery management system at single battery voltage and judge that state-of-charge reaches at 100% o'clock, stop charging.
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| CN 201320119672 CN203119617U (en) | 2013-03-15 | 2013-03-15 | Distributed direct-current independent power supply system for transformer substation |
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| CN (1) | CN203119617U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117596A (en) * | 2013-03-15 | 2013-05-22 | 山东鲁能智能技术有限公司 | Distributed direct-current power supply system for substation |
| CN110091977A (en) * | 2019-04-30 | 2019-08-06 | 北京优世达科技有限公司 | A kind of mixed dynamic switching system of unmanned boat |
-
2013
- 2013-03-15 CN CN 201320119672 patent/CN203119617U/en not_active Expired - Lifetime
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103117596A (en) * | 2013-03-15 | 2013-05-22 | 山东鲁能智能技术有限公司 | Distributed direct-current power supply system for substation |
| CN110091977A (en) * | 2019-04-30 | 2019-08-06 | 北京优世达科技有限公司 | A kind of mixed dynamic switching system of unmanned boat |
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