CN203326621U - Non floating charge lithium battery type DC (direct current) power system used for station - Google Patents

Non floating charge lithium battery type DC (direct current) power system used for station Download PDF

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Publication number
CN203326621U
CN203326621U CN2013201704883U CN201320170488U CN203326621U CN 203326621 U CN203326621 U CN 203326621U CN 2013201704883 U CN2013201704883 U CN 2013201704883U CN 201320170488 U CN201320170488 U CN 201320170488U CN 203326621 U CN203326621 U CN 203326621U
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power
silicon chain
direct current
battery
floating charge
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李晶
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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State Grid Corp of China SGCC
Electric Power Research Institute of State Grid Sichuan Electric Power Co Ltd
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Abstract

The utility model relates to a non floating charge lithium battery type DC (direct current) power system used for a station. The operation modes that a lead-acid storage battery is adopted by the conventional DC power system used for the station for a long time and online floating charge is adopted are changed, a battery management system is added according to the characteristic of a ferrum lithium battery, a working rectifier module and a charging rectifier module are respectively arranged, and a DC control bus and a DC power bus are isolated by a multilevel voltage reducing silicon chain, so that the ferrum lithium battery pack does not need to operate in the online floating charge mode for a long time, and the substantive characteristic is outstanding. The DC power system disclosed by the utility model has a compact structure, is easy to operate and has high safety performance, the automation degree is improved, the number of the batteries is reduced by one third, the performance cost ratio of the system is high, and higher economic benefits can be realized and larger social benefits can be produced when the DC power system is applied in a large scale.

Description

Non-floating charge lithium electricity type station DC power system
Technical field
The utility model relates to the station DC power system in transformer station, current conversion station, power plant and other power engineering; the characteristic of property according to ferrous phosphate lithium ion battery (lithium iron battery) floating charge operation for a long time specifically; utilize the characteristic of voltage dropping silicon chain; design brand-new charge and discharge loop and corresponding control protective unit, make the lithium iron battery group in not carrying out floating charge but the non-floating charge lithium of the operating state of off-line electricity type station DC power system not.
Background technology
Standing by DC power system is protection and the control of power transmission and transforming equipment in transformer station, current conversion station, power plant and other power engineering and the working power of communicating by letter; when power grid accident causes AC interruptions, its battery pack is for accident electricity consumptions such as transforming plant protecting, control, emergency lightings.Stand what by DC power system, adopt is the online floating charging operation mode of battery pack all the time, and its main feature is: 1. will supplement the capacitance loss that the battery pack self discharge causes; 2. there is no battery management system, adopt and regularly carry out the maintenance of equalizing charge mode; 3. battery pack directly is connected to the DC dynamo bus by circuit breaker (or fuse), then power bus voltage that will be higher by the voltage dropping silicon chain device is adjusted into the voltage of the load use that is applicable to the connection of DC control bus, in order to have no progeny DC power supply is provided incessantly in exchanging.But 1. long-term floating charging operation can make the battery pole plates passivation, cause battery capacity decline and life-span to reduce; 2. there is no battery management system, the battery capacity situation can only rely on core discharge capacitor once test in 1~2 year to be assessed, during capacity condition unknown; 3. battery pack directly is connected to the DC dynamo bus, when carrying out the test of core discharge capacitor, will break away from bus, must substitute or other measures by interim battery pack, could meet the requirement that the DL/T724-2000 battery pack does not break away from bus.When so above-mentioned situation is serious, can be when electrical network have an accident, battery pack can't meet the electricity consumption during accident, delays accident and speedily carries out rescue work, and expansion even causes the accident.
The station DC power system of domestic current use lithium iron battery, but be based on structure and the operational mode of former analysing valve control type lead-acid accumulator battery, just simply lead-acid battery is changed into to lithium iron battery, both do not observed the charge and discharge characteristic of lithium iron battery, also can accelerate the inducing capacity fading of lithium iron battery and reduce service life, its cost performance is reduced greatly, therefore directly adopt the lithium iron battery group station of floating charge mode to carry out application by DC power system in power engineering, have difficulty.
The utility model content
The purpose of this utility model is to be not suitable for the characteristic of floating charge operation according to lithium iron battery; and the typical wiring structure of DC power system for existing station; a kind of non-floating charge lithium electricity type station DC power system of utilizing the voltage dropping silicon chain device to realize is provided; be intended to avoid the lithium iron battery group to reduce because of inducing capacity fading and life-span that long-term floating charge causes, meet the accident electricity consumptions such as transforming plant protecting, control, emergency lighting.
The purpose of this utility model is achieved in that a kind of non-floating charge lithium electricity type station DC power system, comprise rectifying device, feed circuit, lithium iron battery group, wherein feed circuit comprises DC control bus KM, the DC output end of described rectifying device is connected to described DC control bus KM, also comprises battery charger, DC dynamo bus HM, multilevel decompression silicon chain device and watch-dog; Described battery charger is by alternating current air switch Q 0, charging rectifier module M 0With direct current air switch QF 0Form; Alternating current air switch Q 0One end is connected to the interchange incoming power, and the other end is connected to charging rectifier module M 0Input; Direct current air switch QF 0One end is connected to charging rectifier module M 0Output, the other end is connected to DC dynamo bus HM; The control end of charging rectifier module M0 is connected to described watch-dog; Described multilevel decompression silicon chain device consists of the series connection of many groups silicon chain and each group silicon chain two ends bypass D.C. contactor in parallel; The input of multilevel decompression silicon chain device is connected to DC dynamo bus HM, and output is connected to DC control bus KM, and control end is connected to described watch-dog;
Described lithium iron battery group is connected to DC dynamo bus HM by fuse R1.
Above-mentioned non-floating charge lithium electricity type station DC power system, also comprise insulation detection device, and insulation detection device has a plurality of test sides and an output, and one of them test side is connected to DC dynamo bus HM, and output is connected to described watch-dog.Feed circuit comprises j bar direct current output branch road, j=1,2 ... n; Direct current output branch road is by direct current air switch Q jBe connected to DC control bus KM, be provided with an insulation detecting sensor CT on every direct current output branch road j, each insulation detecting sensor CT jBe connected to the test side of described insulation detection device.
Also be provided with a shunt FL between lithium iron battery group and DC dynamo bus HM, for detection of the size and Orientation of lithium iron battery group, the output of shunt FL is connected to described watch-dog.
Rectifying device arranges as follows: comprise k alternating current air switch Q k, k work rectification module M k, k=1,2,3 ... n and direct current air switch QF 3Alternating current air switch Q kAn end be connected to the interchange incoming power, the other end is connected to work rectification module M kInput; All working rectification module M kOutput be parallel-connected to direct current air switch QF 3An end, direct current air switch QF 3The other end DC output end that is described rectifying device.
Comprise battery management system in watch-dog, battery management system carries out real-time analysis and management by Acquisition Circuit and equalizing circuit to battery status, by watch-dog and charging, controls with protective circuit battery is carried out to Dynamic Maintenance.Charging rectifier module M is started or stopped to charging control according to lithium iron battery group state, by battery management system 0The equalizing charge that battery pack is carried out or boost charge.Charging rectifier module M 0While quitting work, due to the effect of multilevel decompression silicon chain device, battery is in normal static condition.
Multilevel decompression silicon chain device in the utility model is Pyatyi voltage dropping silicon chain device, be by the series connection of five groups of voltage dropping silicon chains and each group voltage dropping silicon chain two ends respectively a bypass D.C. contactor in parallel form, every group of silicon chain voltage is reduced to 7V.When all open the contact of five bypass D.C. contactors, the voltage that Pyatyi voltage dropping silicon chain device produces is reduced to 35V, when the charging voltage of DC dynamo bus HM reaches 265V, the DC control bus KM that is connected with DC load also can keep the normal working voltage of 230V, can not cause the overvoltage of DC control bus KM; When needs are powered to DC control bus KM by the lithium iron battery group, watch-dog is according to the actual terminal voltage of lithium iron battery group, control the contact open and close of five D.C. contactors and realize stepped voltage regulation, with the voltage that guarantees DC control bus KM in rational scope.
Wherein, the lithium iron battery group is in series by lithium iron battery, and lithium iron battery is ferrous phosphate lithium battery, model FP3291152; Charging rectifier module M 0With work rectification module M kModel be HD22020-3; The multilevel decompression silicon chain device is Pyatyi voltage dropping silicon chain device, consists of 7 volts of each group silicon chain step-downs five groups of silicon chain series connection and each group silicon chain two ends bypass D.C. contactor in parallel; Pyatyi voltage dropping silicon chain device model is DT-2B/300A/35V; Described shunt model is 200A/75mV, 0.5 grade; Watch-dog is based on CAN bus monitoring system, and model is BMJ-FPC.Insulation detection device is insulation tester, and model is JYM-2.
Practical work process of the present utility model is as follows: when AC power is normal, and work rectification module M kFor the regular DC load power supply on DC control bus KM, supply power voltage is 230V.Now, watch-dog all opens the contact of five D.C. contactors of Pyatyi voltage dropping silicon chain device by control board, the voltage difference at Pyatyi voltage dropping silicon chain two ends must surpass 35V could conducting, and now the lithium iron battery group is as in static condition, and its terminal voltage can not surpass 265V.Even the lithium iron battery group, in charged state, when its voltage also can not need to improve charging voltage when the number of batteries increase over 265V(, can be selected seven grades of voltage dropping silicon chains, its voltage drop can reach 49V).Therefore, the Pyatyi voltage dropping silicon chain, when AC power is working properly, all the time in by state, thereby has stoped work rectification module M kTo lithium iron battery group floating charge.Have an accident in causing interchange and have no progeny at electrical network, work rectification module M kWithout direct current output, now the lithium iron battery group is powered to DC control bus KM and DC load thereof incessantly by Pyatyi voltage dropping silicon chain device.Watch-dog, according to the actual terminal voltage of lithium iron battery group, is controlled the contact open and close of 5 D.C. contactors and is realized stepped voltage regulation, with the voltage that guarantees DC control bus KM in rational scope.When battery management system need to charge according to battery analysis of data collected lithium iron battery group, watch-dog sends instruction and starts charging rectifier module M 0The lithium iron battery group is charged, and in charging process, the equalizing circuit of battery management system carries out the equilibrium intervention to each battery charging.
Non-floating charge lithium electricity type station is to have increased battery management system and special charging rectification module with DC power system and traditional station with the difference of DC power system maximum, adopt multilevel decompression silicon chain isolated DC power bus and DC control bus, the lithium iron battery group is avoided in long-term online floating charge operation.And lithium iron battery is not suitable for the operational mode of long-term online floating charge very much, most lithium iron battery manufactory all clearly means that its product can not adopt long-term online floating charge working method.
The beneficial effects of the utility model are: stand and be widely used as the accident electricity consumption such as protection, control, communication, emergency lighting of power transmission and transforming equipment in power engineering by DC power system; as work or the back-up source in the fields such as electric power, communication, its importance is self-evident.Past keeps full capacity and batteries not to break away from DC bus in order to guarantee lead acid accumulator, self discharge in conjunction with lead acid accumulator reaches more greatly regular equalizing characteristics, wiring and the operational mode of online floating charge continued to use in electric power system always, but the floating charge mode can cause long-term the overcharging or charge less of indivedual batteries, makes shorter battery life.And lithium iron battery is very little as its self discharge of novel storage battery, there is the better feature of environmental protection than lead acid accumulator, the advantage such as high capacity density and large current density, now be widely used in electric automobiles, so be necessary very much to be introduced into transformer station, current conversion station, the station of power plant and other power engineering is with in DC power system, but being applied to electric power system, lithium iron battery must improve traditional batteries wiring and way to manage according to the little technical characterstic that waits of its self discharge, change the operation maintenance using method, could bring into play to greatest extent the technical advantage of lithium iron battery.
The utility model changes station and adopts for a long time lead acid accumulator and online floating charge operational mode by DC power system, increased battery management system according to the lithium iron battery characteristics, work rectification module and charging rectifier module have been set up separately, adopt multilevel decompression silicon chain isolated DC control bus and DC dynamo bus, make the online floating charge operation for a long time of lithium iron battery group, there is substantive distinguishing features and progress.Possess the plurality of advantages such as operating temperature range is wide, self discharge is little, long service life, high-multiplying power discharge due to lithium iron battery, the power system accident need for electricity can be met to greatest extent in conjunction with the utility model, the problem of environmental pollution that uses lead acid accumulator to bring can be reduced simultaneously.
The utility model compact conformation, easy operating, security performance is high, and automaticity increases, and number of batteries reduces 1/3rd, and cost performance is high, and large-scale application can realize higher economic benefit and produce larger social benefit.
The accompanying drawing explanation
Fig. 1 is system architecture diagram.
Fig. 2 is the system wiring circuit diagram.
Fig. 3 is voltage dropping silicon chain device connection circuit figure.
Embodiment
As Fig. 2, non-floating charge lithium electricity type station is comprised of following part by DC power system, between each device and structure division, adopts corresponding copper busbar line, copper core cable and measurement, connection to connect.
Rectifying device: the compositions such as high frequency switching rectifier module (M1~MN), 200A alternating current air switch (QF1, QF2), 315A direct current air switch (QF3) and corresponding circuit connection.Air switch QF1, QF2 connect the incoming power from the different substation AC power, its output is connected with rectification module (M1~MN) ac input end of a plurality of parallel connections respectively by 25A alternating current air switch (1Q~NQ), and the positive and negative output of direct current of rectification module (M1~MN) is connected with negative pole (-) with DC control bus anodal (+KM) by direct current air switch (QF3) is corresponding respectively.
Feed circuit: formed by DC control bus (KM) and each output branch road; all regular DC load are small-sized or minisize dc air switch (Q1~QN) connection corresponding to it by the 32A of each self-loop, realizes regular DC load power supply and branch protection.Q1~QN is according to capacity and the quantity configuration of direct current supply load.
Lithium iron battery group (B): be connected to DC dynamo bus HM by lithium iron battery group (B) by fuse R1, between lithium iron battery group and DC dynamo bus HM, also be provided with a shunt FL, the output of shunt FL is connected to watch-dog.Wherein fuse (R1) is protected lithium iron battery group (B), direct current air switch (QF0) and charging rectifier module (M0) when the external short circuits such as DC dynamo bus (HM).
Multilevel decompression silicon chain device: use Pyatyi voltage dropping silicon chain device, comprise voltage dropping silicon chain group (D) and control end (J).As shown in Figure 3, by five groups of silicon chain series connection and each group silicon chain two ends bypass D.C. contactor in parallel (K1~K5), formed each group silicon chain step-down 7V, Pyatyi voltage dropping silicon chain device maximum reducing 35V.
Based on CAN bus monitoring system: comprise watch-dog (JKQ), battery management system (BMS), insulation tester (JYJC).Watch-dog (JKQ) is connected with work rectification module (M1~MN), charging rectifier module (M0), multilevel decompression silicon chain device, battery management system (BMS) and insulation tester (JYJC) by communication bus, carries out the control, monitoring, equilibrium of each module etc.Battery management system (BMS) is comprised of battery Acquisition Circuit, battery equalizing circuit, protection and control circuit etc., is connected to lithium iron battery group (B).Watch-dog (JKQ) and battery management system (BMS) are controlled the operating state of multilevel decompression silicon chain device, make lithium iron battery group (B) outside forcing equalizing charge and boost charge, do not carry out long-term online floating charge, the simultaneously unidirectional general character and the multilevel voltage adjustment of voltage dropping silicon chain (D), guaranteeing that battery pack (B) is can be when AC interruptions continual provides voltage applicable power supply for the DC control bus.Insulation tester (JYJC) gathers respectively DC dynamo bus (HM) positive and negative electrode voltage and carries out the bus insulation monitoring and determine the branch road (route selection) that insulation reduces by the insulation detecting sensor (CT1~CTN) of each direct current output branch road.
Working method and the using method of DC power system for non-floating charge lithium electricity type station, carry out according to the following steps:
A) each part is organized to cabinet, be respectively rectifier cabinet, feeder cabinet and battery rack.Be connected also group screen by cable, copper bar, measurement and connection between unit cabinet uses together.
While b) using; connect the AC380V power supply by ac input end; close a floodgate and send into high frequency switching rectifier module (M1~MN) by 200A alternating current air switch (QF1 or QF2); work rectification module (M1~MN) output direct current is to 315A direct current air switch (QF3) end of incoming cables; direct current air switch (QF3) output is connected to positive pole (+KM) and the negative pole (-) of DC control bus by cable, and provides qualified DC supply for protecting with control and communicate by letter (being the regular DC load of each branch road).Watch-dog during normal operation (JKQ) and battery management system (BMS) gather direct voltage, electric current and battery condition, and work rectification module (M1~MN) and lithium iron battery group (B) are carried out to daily measurement, monitoring and maintenance management.Insulation tester (JYJC) gathers direct voltage and each branch road (CT1~CTN) data are carried out the system insulation condition monitoring, and can when insulation reduce, send and report to the police and deliver to watch-dog (JKQ).After lithium iron battery group (B) completes charging, Pyatyi voltage dropping silicon chain device is when AC power is normal, the control board of Pyatyi voltage dropping silicon chain device is all opened contact D.C. contactor (K1~K5), Pyatyi voltage dropping silicon chain device is in cut-off state, the hot stand-by duty of lithium iron battery group (B) in non-floating charge can be the load power supply at any time.
C) when reaching one of following condition: 1. lithium iron battery group (B) for DC load power supply (can by the judgement of the shunt FL sense of current) after or when 2. battery management system (BMS) monitors lithium iron battery group (B) and reaches the boost charge condition, watch-dog (JKQ) sends the charging work order to charging rectifier module (M0), and charging rectifier module (M0) completes the charging to lithium iron battery group (B) by charge parameter and the program set.
The major function of native system and technical indicator:
Major function: a kind of non-floating charge lithium electricity type station DC power system is provided, is intended to utilize the voltage dropping silicon chain device to realize non-online floating charge operational mode, the inducing capacity fading of avoiding lithium iron battery group leader phase floating charge to cause and life-span reduce.The native system rectification module can charged hot plug; possess perfect AC and DC defencive function and batch (-type) charging modes; under the prerequisite that meets the accident electricity consumption needs such as transforming plant protecting, control, emergency lighting, extended the service life of equipment cycle, improved the equipment cost performance.
Non-floating charge lithium electricity type station DC power system technical indicator:
Power system capacity: 200Ah;
AC-input voltage: 380V;
Exchange input current: 200A;
Average anode current: 250A;
Charging voltage: 242V-252V;
Charging current: 20A-50A (0.1 C 10-0.25C 10)
Voltage stability: 0.5%;
Ripple coefficient: 0.5%
Current stability: 1%;
Module current-sharing degree of unbalance: 3%
Cell voltage is patrolled and examined precision: 0.2%;
Insulating monitoring props up way: 32 Lu~768 tunnels;
Number of batteries: 70/group;
Monitoring management: the BMS based on the CAN bus;
Lithium iron battery rated voltage: 3.2V/ monomer;
Lithium iron battery charging voltage: 3.6V/ monomer (20 ℃);
Lithium iron battery final discharging voltage: 2.55V/ monomer;
Lithium iron battery self discharge amount: standing 28 days<3%(20 ℃);
Lithium iron battery cycle life: 1500 times.
The parameter of main device and equipment:
Ferrous phosphate lithium battery: model FP3291152, Harbin Guang Yu group;
High frequency switching rectifier module: model HD22020-3, Ai Mosheng power supply company;
Watch-dog (built-in BMS): model BMJ-FPC, Harbin light space power supply company;
Insulation monitoring and warning device: model JYM-2, Ai Mosheng power supply company;
The interchange sky is opened: model GM100M, Beijing RenMin Electric Appliance Factory;
The direct current sky is opened: model GM400 or GM100, Beijing RenMin Electric Appliance Factory;
Voltage dropping silicon chain: model DT-2B/300A/35V, Lvshun, Dalian and power power-supply device factory;
Shunt (FL): 200A/75mV, 0.5 grade.

Claims (7)

1. a non-floating charge lithium electricity type station DC power system, comprise rectifying device, feed circuit, lithium iron battery group, wherein feed circuit comprises DC control bus KM, and the DC output end of described rectifying device is connected to described DC control bus KM, it is characterized in that
Also comprise battery charger, DC dynamo bus HM, multilevel decompression silicon chain device and watch-dog;
Described battery charger is by alternating current air switch Q 0, charging rectifier module M 0With direct current air switch QF 0Form; Alternating current air switch Q 0One end is connected to the interchange incoming power, and the other end is connected to charging rectifier module M 0Input; Direct current air switch QF 0One end is connected to charging rectifier module M 0Output, the other end is connected to DC dynamo bus HM; The control end of charging rectifier module M0 is connected to described watch-dog;
Described multilevel decompression silicon chain device consists of the series connection of many groups silicon chain and each group silicon chain two ends bypass D.C. contactor in parallel; The input of multilevel decompression silicon chain device is connected to DC dynamo bus HM, and output is connected to DC control bus KM, and control end is connected to described watch-dog;
Described lithium iron battery group is connected to DC dynamo bus HM by fuse R1.
2. non-floating charge lithium electricity type as claimed in claim 1 station DC power system, it is characterized in that, also comprise insulation detection device, described insulation detection device has a plurality of test sides and an output, one of them test side is connected to DC dynamo bus HM, and output is connected to described watch-dog.
3. non-floating charge lithium electricity type as claimed in claim 2 station DC power system, is characterized in that, described feed circuit also comprises j bar direct current output branch road, j=1,2 ... n; Described direct current output branch road is by direct current air switch Q jBe connected to DC control bus KM, be provided with an insulation detecting sensor CT on every direct current output branch road j, each insulation detecting sensor CT jBe connected to the test side of described insulation detection device.
4. non-floating charge lithium electricity type as claimed in claim 1 station DC power system, is characterized in that, also be provided with a shunt FL between described lithium iron battery group and DC dynamo bus HM, the output of shunt FL is connected to described watch-dog.
5. non-floating charge lithium electricity type station DC power system as claimed in claim 1 or 2 or 3 or 4, is characterized in that, described rectifying device comprises k alternating current air switch Q k, k work rectification module M k, k=1,2,3 ... n and direct current air switch QF 3Alternating current air switch Q kAn end be connected to the interchange incoming power, the other end is connected to work rectification module M kInput; All working rectification module M kOutput be parallel-connected to direct current air switch QF 3An end, direct current air switch QF 3The other end DC output end that is described rectifying device.
6. non-floating charge lithium electricity type as claimed in claim 5 station DC power system, is characterized in that,
Described lithium iron battery group is in series by lithium iron battery, and described lithium iron battery is ferrous phosphate lithium battery, model FP3291152;
Described charging rectifier module M 0With work rectification module M kModel be HD22020-3;
Described multilevel decompression silicon chain device is Pyatyi voltage dropping silicon chain device, consists of 7 volts of each group silicon chain step-downs five groups of silicon chain series connection and each group silicon chain two ends bypass D.C. contactor in parallel; Described Pyatyi voltage dropping silicon chain device model is DT-2B/300A/35V;
Described shunt model is 200A/75mV, 0.5 grade;
Described watch-dog is based on CAN bus monitoring system, and model is BMJ-FPC.
7. non-floating charge lithium electricity type station DC power system as claimed in claim 2 or claim 3, is characterized in that, described insulation detection device is insulation tester, and model is JYM-2.
CN2013201704883U 2013-04-08 2013-04-08 Non floating charge lithium battery type DC (direct current) power system used for station Active CN203326621U (en)

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Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103219766A (en) * 2013-04-08 2013-07-24 国家电网公司 Non floating charge lithium battery type DC (direct current) power system used for station
CN103855768A (en) * 2014-02-26 2014-06-11 成都信息工程学院 Storage battery non-floating-charging hot standby technology
CN105322592A (en) * 2014-06-17 2016-02-10 3S解决股份公司 Multi-purpose charging apparatus

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN103219766A (en) * 2013-04-08 2013-07-24 国家电网公司 Non floating charge lithium battery type DC (direct current) power system used for station
WO2014166368A1 (en) * 2013-04-08 2014-10-16 国家电网公司 Direct-current power source system for non-floating charging lithium type station
CN103855768A (en) * 2014-02-26 2014-06-11 成都信息工程学院 Storage battery non-floating-charging hot standby technology
CN105322592A (en) * 2014-06-17 2016-02-10 3S解决股份公司 Multi-purpose charging apparatus

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