CN201726205U - AC energy storage cabinet and energy storage power station system - Google Patents

AC energy storage cabinet and energy storage power station system Download PDF

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Publication number
CN201726205U
CN201726205U CN2010202262275U CN201020226227U CN201726205U CN 201726205 U CN201726205 U CN 201726205U CN 2010202262275 U CN2010202262275 U CN 2010202262275U CN 201020226227 U CN201020226227 U CN 201020226227U CN 201726205 U CN201726205 U CN 201726205U
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China
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circuit
battery
unit
energy storage
energy
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CN2010202262275U
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Chinese (zh)
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王新保
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王新保
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Abstract

The utility model discloses an AC energy storage cabinet and an energy storage power station system; the AC energy storage cabinet comprises a PCS module and at least one battery module, wherein the battery module comprises a battery pack used for storing electric energy, and a multifunctional sub-charging unit used for monitoring the battery pack, wherein at least one battery pack is available; each battery pack is configured with the multifunctional sub-charging unit; and the multifunctional sub-charging unit is connected with the battery pack. The utility model effectively improves the safety and the reliability of an energy storage power station, and reduces the high-voltage DC power distribution link replaced by AC power distribution link which is low in price and mature, thus effectively reducing the cost.

Description

A kind of interchange energy storage cabinet and energy-accumulating power station system

Technical field

The utility model relates to a kind of energy storage device, in particular a kind of interchange energy storage cabinet and energy-accumulating power station system.

Background technology

As shown in Figure 1, the secondary cell energy-accumulating power station is made of battery pile and PCS (inverter) usually, comprises charging circuit and inverter circuit among the PCS usually.When being in low power consumption period, the charging circuit among the PCS is converted into direct current with the alternating current on the electrical network, charges to battery pile.When being in peak of power consumption period, the inverter circuit of the direct current of battery pile by PCS is converted into AC energy and injects electrical network.Inverter among the PCS can also be controlled the electric current of injection electrical network and the phase place between the line voltage usually, thereby also can realize the purpose that reactive power is regulated.

It generally is hundreds of kilowatt at least that the generated output of energy-accumulating power station requires, and most cases is that requirement reaches more than several megawatts, and also can require to reach a hour level usually to the battery discharge time of energy-accumulating power station, and requiring usually is more than 4-5 hour.Therefore, energy-accumulating power station normally is made of huge battery pile and powerful PCS at present.For example, a 1MW, the canonical system of 4 hours energy-accumulating power station of power backup comprise the total power distribution cabinet of interchange tandem that connects electrical network, PCS, direct current tandem power distribution cabinet and the battery rack of 500KW as shown in Figure 2, also comprise the energy-accumulating power station watch-dog.

There is following deficiency in this typical secondary cell energy-accumulating power station at present:

1, the battery pile of every PCS is too huge.Each battery pile is to be made of numerous battery rack parallel connections, and finally gathers, and each battery rack inside also is made up of considerable single battery connection in series-parallel.The energy of each battery pile storage can reach megawatt hour thus, just in case accident occurs, consequence is more fearful.For example, just in case be short-circuited, problem such as on fire produces huge destruction.

2, the number of batteries in each battery pile is too much, and for example, the typical monomers of ferric phosphate lithium cell is about 3.2V/20AH at present, will comprise the such battery cell of nearly 30,000 joints in the then above-mentioned battery pile.In the process of charge or discharge, any joint monomer goes wrong, and it is too high or too low monomer battery voltage for example to occur, probably causes the PCS of whole 500KW must quit work to prevent that battery failures from worsening.This causes the availability of system and reliability to reduce.

3, huge battery pile generally need be carried out parallel connection earlier by a large amount of cells, and then series connection becomes battery pack, and need form battery pile again by a large amount of this battery pack parallel connections again.The quantity in parallel of cell is too much, and perhaps the quantity in parallel of battery pack is too much, between cell, perhaps between the parallel battery, has circulation easily, perhaps uneven flow problem.When battery pack are in parallel in a large number, also may drop into moment generation rush of current in the input process in parallel because voltage is inconsistent between the battery pack.

4, can have the connection in series-parallel combination of a large amount of battery pack in the huge battery pile, in system's distribution, many direct current distribution links can occur, for example galvanic tandem, deciliter, open circuit protection etc.In addition, because the disjunction of direct current is difficult to arc extinguishing, so it is all bulky to satisfy the circuit breaker, fuse etc. of high voltage direct current, price is high between a plurality of parallel battery.The circuit breaker or the fuse that are used for direct current, normally same size exchanges several times to tens times price of device, causes system's construction cost costliness.

5, the design of energy-accumulating power station, maintenance, dilatation etc. are not flexible especially.

Therefore, prior art has yet to be improved and developed.

The utility model content

The purpose of this utility model is to provide a kind of interchange energy storage cabinet and energy-accumulating power station system, and it is excessive to be intended to solve existing energy-accumulating power station battery pile, and batteries in parallel connection group number is too much, and reliability is low, and system configuration is dumb, construction cost height, and problem such as easy-maintaining not.

The technical solution of the utility model is as follows:

A kind of interchange energy storage cabinet comprises a PCS module and at least one battery module, and described battery module comprises:

The power brick of store electrical energy;

The multi-functional branch of monitoring battery bag fills the unit,

Wherein, described power brick is at least one, and each power brick disposes a described multi-functional branch and fill the unit, and described multi-functional branch fills the unit and connects described power brick.

Described interchange energy storage cabinet, wherein, described PCS module comprises: first current foldback circuit and the soft-start circuit that are connected with battery module;

Second current foldback circuit and the soft-start circuit that are connected with electrical network;

Be arranged on the dc-link capacitance on the dc bus;

The energy of battery module is reverse into alternating current sends into grid generation, or will offer the inverter circuit of the power brick charging in the battery module after the rectification of electrical network energy;

Each circuit working state in the control PCS module, and the control circuit of management battery module;

Fill the telecommunication circuit that the unit communicates with energy-accumulating power station watch-dog and described multi-functional branch;

Wherein, first current foldback circuit and soft-start circuit, dc-link capacitance, inverter circuit, second current foldback circuit and soft-start circuit connect successively, and control circuit connects telecommunication circuit, first current foldback circuit and soft-start circuit, inverter circuit, second current foldback circuit and soft-start circuit.

Described interchange energy storage cabinet, wherein, described PCS module comprises: first current foldback circuit and the soft-start circuit that are connected with battery module;

Second current foldback circuit and the soft-start circuit that are connected with electrical network;

Be arranged on the dc-link capacitance on the dc bus;

The energy of battery module is reverse into alternating current sends into grid generation, but or will offer the inverter circuit of the twocouese work of the power brick heap charging in the battery module after the rectification of electrical network energy;

The first control circuit of each circuit working state in the control PCS module;

First telecommunication circuit that communicates with the energy-accumulating power station watch-dog;

Wherein, first current foldback circuit and soft-start circuit, dc-link capacitance, inverter circuit, second current foldback circuit and soft-start circuit connect successively, and first control circuit connects first telecommunication circuit, first current foldback circuit and soft-start circuit, inverter circuit, second current foldback circuit and soft-start circuit.

Described interchange energy storage cabinet, wherein, described interchange energy storage cabinet also comprises a battery module control unit, described battery module control unit is used to receive multi-functional branch and fills the interior data of power brick that transmit the unit, control the operating state that multi-functional branch fills the unit, data to power brick are carried out analyzing and processing, and battery data and analysis processing result are transmitted the first control circuit of PCS and the watch-dog of outside;

Described battery module control unit comprises: the second control circuit of control battery module; Reach with the energy-accumulating power station watch-dog, with first control circuit, fill the second communication circuit that the unit communicates with described multi-functional branch; Wherein, second control circuit connects the second communication circuit, and described second communication circuit connects the energy-accumulating power station watch-dog respectively and multi-functional branch fills the unit.

Described interchange energy storage cabinet, wherein, described multi-functional branch fills the unit and comprises:

Be used for control output voltage and electric current, the electrical isolation between output and the input is provided, realize the charging of single battery bag, the power conversion circuit that contains isolating transformer of powering simultaneously for single-chip microcomputer;

Be used for control signal, open or turn-off the output control circuit of output circuit according to single-chip microcomputer;

Be used for and will give single-chip microcomputer after by electrical isolation from the signal of communication of outside, the communication signal that single-chip microcomputer is sent sends outside optical coupling isolation circuit to after by electrical isolation simultaneously;

Be used to control the single-chip microcomputer that multi-functional branch fills the unit;

Wherein, the power conversion circuit, output control circuit, the optical coupling isolation circuit that contain isolating transformer are connected to single-chip microcomputer respectively, and the power conversion circuit that contains isolating transformer connects output control circuit.

Described interchange energy storage cabinet, wherein, described multi-functional branch fills the unit and also comprises: detect first temperature sensor that multi-functional branch fills temperature in the unit, it is connected to single-chip microcomputer.

Described interchange energy storage cabinet wherein, is provided with second temperature sensor in the described battery pile, be used to detect the temperature of battery, and pass to described single-chip microcomputer.

Described interchange energy storage cabinet, wherein, described PCS module also comprises: detect the voltage and current testing circuit of the voltage and current of described interchange energy storage cabinet, described voltage and current testing circuit connects control circuit.

Described interchange energy storage cabinet, wherein, described PCS module also comprises fills the step-down conversion circuit of unit as power supply with offering multi-functional branch after the busbar voltage reduction, and described step-down conversion circuit connects dc-link capacitance and control circuit.

A kind of energy-accumulating power station system wherein, comprises above-mentioned interchange energy storage cabinet in the described energy-accumulating power station system.

The beneficial effects of the utility model: the utility model is by being separated into little battery pile with huge battery pile, avoided the centralized stores of the storage of energy, reduced because cell quantity in parallel is too much, or the technical risk in the too much application process of battery pack connection in series-parallel quantity, effectively improved the fail safe and the reliability of energy-accumulating power station; Reduced high voltage direct current distribution link, replaced with cheap and ripe AC distribution link, thereby effectively reduce cost; Utilize modular mode to realize the energy-accumulating power station system, thereby made things convenient for the design in power station, configuration, maintenance and dilatation.

Description of drawings

Fig. 1 is the theory diagram of existing secondary cell energy-accumulating power station system;

Fig. 2 is an existing capacity 1MW, the system block diagram of 4 hours energy-accumulating power station of power backup;

Fig. 3 is the theory diagram of the utility model energy-accumulating power station system;

Fig. 4 is the schematic block diagram that exchanges the energy storage cabinet in the utility model;

Fig. 5 is the schematic block diagram of PCS module in the utility model;

Fig. 6 is the schematic block diagram of battery module in the utility model;

Fig. 7 is the schematic block diagram of battery pile in the utility model;

Fig. 8 is the schematic block diagram that multi-functional branch fills the unit in the utility model;

Fig. 9 is the interchange energy storage cabinet schematic block diagram of another embodiment of the utility model;

Figure 10 is the schematic block diagram of the PCS module among another embodiment of the utility model;

Figure 11 is the schematic block diagram of the battery module control unit in another enforcement of the utility model.

Embodiment

For making the purpose of this utility model, technical scheme and advantage clearer, clear and definite, below the utility model is further described with reference to the accompanying drawing embodiment that develops simultaneously.

Be the theory diagram of the utility model energy-accumulating power station system as shown in Figure 3, this energy-accumulating power station system comprises that one-level exchanges the total power distribution cabinet 20 of tandem, secondary exchanges tandem power distribution cabinet 30, exchanges energy storage cabinet 40; Also comprise energy-accumulating power station watch-dog 11.Wherein one-level exchanges the total power distribution cabinet 20 connection electrical networks of tandem, and the alternating current on the electrical network is passed to connected two secondarys exchange on the tandem power distribution cabinet 30, described secondary streams tandem power distribution cabinet 30 gathers alternating current and is 500KW/2Mkwh, exchanges tandem power distribution cabinet at each secondary and is parallel with 10 for 30 times and exchanges energy storage cabinets 40 and capacity is 50KW/200Kwh; Described energy-accumulating power station watch-dog 11 connects the running status that the communication interface that exchanges energy storage cabinet 40 is used to monitor energy-accumulating power station.

Referring to Fig. 4, figure is the composition frame chart that exchanges energy storage cabinet 40.Exchange energy storage cabinet 40 and comprise at least one battery module 60 and at least one PCS module 50, comprise in the described battery module 60 by the ferric phosphate lithium cell of 13 monomer 20AH is in parallel forming a power brick 61 and multi-functional branch fills unit 62, comprise 5 series connected battery bags, 61 formations (seeing also Fig. 6) in the described battery module 60.The number of cell in parallel can be other quantity in each power brick 61.

Present embodiment will exchange energy storage cabinet 40 built-in the PCS module 50 of a smaller power (in the present embodiment its power being made as 50KW), make interchange energy storage cabinet 40 no longer directly export direct current, but make each exchange the alternating current that energy storage cabinet 40 can directly connect in the electrical network, thereby make each cabinet can be built into a small-sized energy-accumulating power station unit separately.Can convenient for maintaining and dilatation with this.Each this little interchange energy storage cabinet can be exported the power of 50KW, and the stored energy capacitance that exchanges the energy storage cabinet is nominally 200 kilowatt hours, and it means: when its with 50KW during to grid generation, its inner energy-storage battery can support 4 hours discharge time.

Referring to Fig. 5, be the theory diagram of PCS module in the utility model.Comprise first overcurrent protection and soft-start circuit 51, second overcurrent protection and soft-start circuit 52, inverter circuit 53, dc-link capacitance 54, control circuit 55, accessory power supply 59, step-down conversion circuit 56, telecommunication circuit 57, voltage and current testing circuit 58 that can two-way operation in the described PCS module 50.

Wherein, second overcurrent protection and soft-start circuit 52 externally are connected to secondary and exchange on the tandem power distribution cabinet 30; connect inverter circuit 53, dc-link capacitance 54 and first overcurrent protection and soft-start circuit 51 then successively, described first overcurrent protection and soft-start circuit 51 output DCs are connected on the battery module 60.Described step-down conversion circuit 56 1 ends are connected on the dc-link capacitance 54, and other end output DC is as the power supply of battery module; Control circuit 55 connects second overcurrent protection and soft-start circuit 52, first overcurrent protection and soft-start circuit 51, inverter circuit 53, step-down conversion circuit 56, telecommunication circuit 57, voltage and current testing circuit 58 respectively, and each circuit is controlled.Telecommunication circuit respectively in succession the multi-functional branch in energy-accumulating power station watch-dog 11 and battery module 60 fill on the unit 62.

Please continue referring to Fig. 5, exchange in first overcurrent protection and the dc-link capacitance 54 before the soft-start circuit 51 access inverter circuits 53 of cell voltage in the energy storage cabinet 40 by PCS module 50 inside.

Described first overcurrent protection and soft-start circuit 51 comprise current foldback circuit, wherein mainly comprise fuse, the effect of this fuse be with avoid 53 short circuits of back level inverter circuit the battery short circuit that may cause; Also comprise soft-start circuit, described soft-start circuit comprises relay and series resistance, the purpose of this series resistance is when the battery pile in the battery module 60 61 is connected with dc-link capacitance 54, can charge to dc-link capacitance 54 by resistance earlier, when treating both voltage basically identicals, closing relay is excessive in 61 pairs of dc-link capacitance 54 charging currents of insertion rack moment battery pile to avoid PCS module 50 again.

The inverter circuit 53 of two-way operation is reverse into and exchanges and to the grid side generating being articulated in battery side direct voltage on inverter circuit 53 dc buss realizing, and the function that the interchange of grid side is converted to direct current and gives batteries charging.Play the DC filtering effect in 54 pairs of inverter circuit 53 courses of work of dc-link capacitance.Inverter circuit 53 is made of three phase full bridge or half-bridge circuit, has adopted the design of three-phase tri-level half-bridge inversion circuit in the present embodiment, comprising power switch pipe, and high-frequency inductor and ac filter electric capacity.Inverter circuit 53 output phase three-wire three or three-phase and four-lines exchange with one-level by secondary and to be connected to electrical network after gathering electric cabinet tandem.A step-down conversion circuit 56 is connected on the dc-link capacitance 54, adopted the half-bridge reduction voltage circuit of band transformer isolation here, to the busbar voltage step-down, the voltage after the step-down offered multi-functional branch fill unit 62 and do power supply.The accessory power supply 59 of PCS module 50 is by second overcurrent protection and soft-start circuit side-draw electricity, when the interchange output of PCS module with after electrical network is connected, accessory power supply promptly starts and powers on, and is used for the module for power supply to PCS.

Control circuit 55 makes 52 work of second overcurrent protection and soft-start circuit, and civil power can be earlier flowed through by resistance and given dc-link capacitance 54 chargings after inverter circuit 53 rectifications, to avoid civil power to insert the back immediate current of dc-link capacitance 54 is impacted.After treating that dc-link capacitance 54 voltages are stable; series resistance in second overcurrent protection and the soft-start circuit 52 is fallen by the relay short circuit; inverter circuit 53 reverse operations are in the rectification pattern; the busbar voltage pump is risen near stack voltage; starting first overcurrent protection and soft-start circuit 51 subsequently; by series resistance battery pile and bus are coupled together, after the current stabilization again with the series resistance relay closes.After start-up course was finished, PCS module 50 made PCS module 50 work in charge mode, discharge mode, Power Regulation pattern or standby mode according to the instruction that energy-accumulating power station watch-dog 11 sends.In the charge or discharge pattern, PCS module 50 by and battery module 60 in multi-functional branch fill communication (specifically seeing for details hereinafter) between the unit 62, obtain the state of each battery of the power brick 61 in the interchange energy storage cabinet 40, and send the data of these batteries to energy-accumulating power station watch-dog 11.The battery data that the control circuit 55 of while PCS module 50 is uploaded according to battery module 60, control is connected to the output that the multi-functional branch of particular battery fills unit 62 in the battery module 60, residual capacity difference between the regulating cell realizes the battery balanced management to power brick 61.

Referring to Fig. 6, each battery module 60 inside includes a plurality of power brick 61 that composed in parallel by the LiFePO4 cell and fills unit 62 with the multi-functional branch of power brick 61 equal numbers, wherein, described multi-functional branch fills unit 62 and is used for providing electric weight to replenish to power brick 61.The number that can fill unit 62 according to the multi-functional branch of different increases and decreases flexibly of 61 quantity of the power brick in the battery module 60 realizes the configuration at the different size battery module easily, and battery management function flexibly is provided.A plurality of battery modules 60 in the described interchange energy storage cabinet 40 are composed in series the battery pack with high-voltage value by the cable in the rack, are connected to then on the PCS module 50.

As shown in Figure 7, wherein 5 power brick 61 series connection form a macrocell bag 63, reach suitable voltage and capacity, for example adopting the monomer capacity in the present embodiment is 20AH, and monomer voltage is the ferric phosphate lithium cell of 3.2V, in parallel by 13 joints earlier, the power brick 61 of forming the 3.2V260AH capacity, and then 5 joint series connection, form 16V, the macrocell bag 63 of 260AH.Each multi-functional branch fills the unit can draw second temperature sensor (not shown this temperature sensor) that detects temperature in the power brick 61, and detected temperature data is passed to multi-functional branch and fills in the unit 62.

(what use in the present embodiment is the hot plug terminal by splicing ear in 5 power brick 61 series connection total outputs afterwards, to make things convenient for changing of battery module at OIR) be sent to cell module outer portion, so that again battery module is gone here and there and connects by exchanging cable in the energy storage cabinet.48 all in present embodiment battery modules are series connected, and draw center line, have formed the direct voltage of positive and negative 384V and have given inverter.The reason of forming this voltage is: for most of transformerless semi-bridge type inverters, if need to export the alternating voltage about three-phase 220V, then busbar voltage is between the positive and negative 320V-400V usually, therefore produce the work of the convenient realization of such busbar voltage inverter, charge the battery when also making things convenient for the inverter reverse operation simultaneously.

Simultaneously, 5 joint series connected battery bags 61 have also been sent 5 pairs of equilibrium charging electric wires in the described macrocell bag 63, as shown in Figure 7: by any a pair of charging electric wire, can detect this, also can the balance electric weight is provided for separately this power brick to line by this to connecting the monomer voltage of battery between the line.

An other end of described 5 pairs of equilibrium charging electric wires is connected to 5 multi-functional branches and fills on the unit 62, simultaneously, can imbed some temperature sensors in the power brick, and the holding wire of temperature sensor also is sent to multi-functional branch and fills on the unit 62.

In addition, in battery module 60 Front-end Design one latch is arranged, in the time will from rack, extracting battery module, must draw back latch earlier, the action of auxiliary contact can be touched when drawing back latch, after the control circuit that multi-functional branch fills unit 62 and PCS module 50 detects, the work of charge or discharge circuit can be stopped immediately, make interchange energy storage cabinet 40 change standby mode over to, guarantee that battery module 60 can safe extracting from rack.Each multi-functional branch fill unit 62 can by to company temperature sensor input know the battery temperature that it connects, also can pass through this equilibrium charging electric wire, to company power brick carry out the detection of voltage, the testing circuit of this respect is very ripe, does not elaborate in this manual.

Be illustrated in figure 8 as the theory diagram that multi-functional branch of the present utility model fills unit 62, described multi-functional branch fills unit 62 and comprises that the power conversion circuit 621, output control circuit 622, optical coupling isolation circuit 623, the multi-functional branch of detection that contain isolating transformer fill first temperature sensor 624 and the single-chip microcomputer 627 of unit 62 internal temperatures.The power conversion circuit 621 that wherein contains isolating transformer is used for control output voltage and electric current, and the electrical isolation between output and the input is provided, and realizes single battery is charged.Simultaneously also provide power supply for control circuits such as single-chip microcomputers; Described output control circuit 622 is used for the control signal according to single-chip microcomputer, can be in and open or off state.When opening, branch fills the unit can provide charging current to battery; Described optical coupling isolation circuit 623 is used for and will gives single-chip microcomputer after by electrical isolation from the signal of communication of outside.Simultaneously the communication signal that sends of single-chip microcomputer 627 sends the PCS module to after by electrical isolation; Described single-chip microcomputer 627 is used to detect corresponding cell voltage, and temperature and branch fill the unit internal temperature and branch fills the unit output current.Give PCS module these data by communication.Simultaneously, according to the instruction that the PCS module sends, whether control allows branch fill the battery charge of exporting to of unit internal power converter.

In the production process of battery, because the battery of producing in batches can't be accomplished hundred-percent characteristic unanimity, when this just causes the series connection of a lot of batteries to use, if to this battery pile serial connection charge, then because of the tiny difference of characteristic between institute's series connected battery, the battery that causes wherein having can fill full earlier than other battery, do not press although total stack voltage also reaches full charging, if continue charging this moment, then this battery may damage in overvoltage, if stop charging, then other battery fails to fill full again.Too, the battery that also may have is earlier by emptying during discharge, and other batteries also have the situation of residual capacity, then or continue discharge, but can cause earlier by the battery over-discharge can of emptying, or stop discharge, and then the battery pile capacity can not be fully utilized again.If this situation is let go unchecked, battery pile is very easy to be damaged, and battery pile also can't reach the cycle life of single-unit lithium battery.At above-mentioned situation, the application of most lithium battery heap is added in the system, can provide the improvement measure with following these methods usually:

1, in to series connected battery bag charge or discharge process,,, then stops charge or discharge in case find that overvoltage or under-voltage appears in monomer by monomer voltage is monitored.This method is the simplest, but causes unbalanced aggravation easily after repeatedly charging and discharging, and the battery pile available capacity is reduced, and causes waste.。

2, monitoring monomer charging voltage in charging process, if finding certain batteries is filled earlier full, then on this batteries, incorporate a shunt resistance loop into, part or all charging current that order flows into this batteries is originally bypassed by resistance, so just might make the charging voltage of this battery no longer continue to rise, and make other battery in the battery strings have an opportunity to continue to charge to full till.The problem of this method is that the process of resistance bypass charging current is actually rechargeable energy is consumed, if the charging current that bypasses is excessive, then can cause serious heating, and produce unnecessary loss.For high capacity cell, this loss is quite big.

3, the serial connection charge of macrocell bag is made into each power brick is charged respectively, be that so-called branch fills mode, this method can be controlled the charging voltage of power brick separately, but for a battery pile that has hundreds of batteries to be composed in series, need hundreds of such chargers, unless the charge power requirement to each charger is very little, otherwise can be very expensive.

4, more satisfactory method is to utilize the Technics of Power Electronic Conversion technology, in the process of charge or discharge, at any time the part electric weight of some battery can be switched on some other electric weight in battery pile battery on the low side, thereby it is full to realize that all batteries are filled simultaneously, also simultaneously by emptying, realize the maximum using of battery pile, avoid occurring overcharging and crossing the situation of putting and owing to fill and owing to put.This respect has had some researchs, such as by the mode of energy from " organizing monomer " or " monomer to group ", the energy of entire cell heap is injected certain joint or a few batteries by power inverter, perhaps the energy with certain batteries injects the entire cell heap by power inverter, realizes the capacity equilibrium between each battery in the battery pile by these methods.

In the present embodiment, for realizing the equilibrium of power brick, the mode that has adopted high-power serial connection charge and small-power equalizing charge to combine:

1, high-power string fills:

The battery module that exchanges in the energy storage cabinet is series connected, and forms the battery pack of positive and negative 384V, and the output of described power brick is articulated on the dc bus of the inverter circuit in the PCS module that exchanges in the energy storage cabinet.When the inverter circuit reverse operation of PCS module, inverter circuit carry out serial connection charge can for the power brick that exchanges in the energy storage cabinet.Adopt this method virtually completely to save the cost of charger, can obtain simultaneously bigger charge power (because charge power is identical with inverter power), in the present embodiment, the inverter circuit of 50KW also can be exported the charge power of 50KW in charging, can reach 65A to the battery pile maximum charging current of positive and negative 384V.

2, the small-power equilibrium is filled

Comprised 5 multi-functional branches in each battery module of present embodiment and filled the unit, the output that each branch fills the unit all is wired in the power brick by equilibrium charging shown in Figure 7.

As shown in Figure 8, in the PCS module, the busbar voltage of positive and negative 384V is depressurized to 48VDC by the DC/DC reduction voltage circuit.The effect of this step-down conversion circuit is to provide the input power supply for 240 the multi-functional branches altogether in 48 battery modules in the interchange energy storage cabinet fill the unit.The design power output that each multi-functional branch fills the unit is approximately 15W, and its circuit adopts the anti exciting converter of constant voltage and current limiting control, and these multi-functional branches fill the unit can provide balanced electric weight to come the difference of residual capacity between the balancing battery to each power brick respectively.

The energy that provides balanced multi-functional branch to fill the unit to each batteries is the bus that comes from the PCS module, in the discharge process, the energy of the bus of PCS module comes from battery pack, and the equilibrium when just discharging is that energy is transferred to a few batteries the battery pack from whole battery group.In the charging process, the bus energy from inverter as charger work.Energy is transferred to a few batteries in the battery pack by the charger that whole battery group is carried out serial connection charge when just charging.

In the present embodiment, divide and to fill and to go here and there the operation principle of filling combined mode as follows:

1) the charging initial stage adopts string to fill, and provides big electric current to charge by the inverter of reverse operation, and is full in the shortest time battery is charged near filling.Fill in this example, the string stage of filling can maximum charge with the 65A electric current.

2) in the charging later stage, the battery module control unit according to multi-functional branch fill that the unit uploads monomer battery voltage, if finding the full charging that has battery to reach earlier presses, then the battery module control unit notice PCS module big electric current string that stops inverter fills, notify multi-functional branch to fill the unit starting branch and fill, fill all batteries full with little electric current.

3) in the charge or discharge process, the battery module control unit is if find that some cell voltage is starkly lower than average voltage, and then the corresponding multi-functional branch of notice fills the unit provides euqalizing current, makes these cell voltages progressively near average voltage.

4) the battery module control unit is according to the voltage data of each batteries in previous charge or discharge later stage, regulates that each branch fills the work period that the unit provides euqalizing current in this charge and discharge process.Mode by recurrence is approached can find fill the cell operation cycle to every batteries after repeatedly discharging and recharging rational branch, reaches best portfolio effect.

Referring to Fig. 9 is another embodiment of interchange energy storage cabinet of the present utility model, and described interchange energy storage cabinet 40 comprises PCS module 50, battery module 60 and battery module control unit 100.Described battery module control unit 100 respectively with PCS module 50 in first telecommunication circuit, energy-accumulating power station watch-dog and battery module 60 in multi-functional branch fill unit 62 and set up and communicate by letter.

Referring to Figure 10 is PCS module among another embodiment of the present utility model, the difference of the PCS module among this PCS module and the last embodiment is, first control circuit 955 in the present embodiment is different with the function of control circuit 55, first control circuit 955 has included only the function of the circuit in the control PCS module in the control circuit 55, does not control the function that multi-functional branch fills the unit in the battery module.First telecommunication circuit 957 is also different with the effect of telecommunication circuit 57, and first telecommunication circuit is used for setting up with battery module control unit 100 with energy-accumulating power station watch-dog 11 and communicates by letter in the present embodiment.

Fill the battery module control unit 100 of unit referring to Figure 11 for multi-functional branch in the control battery module among another embodiment of the present utility model, described battery module control unit 100 comprises second control circuit 110 and second communication circuit 120.Described second control circuit 110 is used to control the operating state that multi-functional branch fills the unit; Described second communication circuit 120 is used for filling unit 62 with multi-functional branch, the communication of PCS control circuit 55 and energy-accumulating power station watch-dog 11.Described battery module control unit 100 can be arranged on the PCS mould and determine and innerly also can be arranged on the PCS module separately and become an independent unit outward.In actual use, can be arranged in the interchange energy storage cabinet as an independently unit use.

In sum, this high-power string taked of the interchange energy storage cabinet in this patent fills the lithium battery equalizing charge design of filling in conjunction with the small-power branch and has following advantage:

1) utilizes the reverse rectification mode of operation of inverter that powerful charging current is provided, saved the cost of high-power charger.

2) utilize step-down conversion circuit and multi-functional branch to fill the unit, will offer respectively and exchange specific 3.2V power brick in the energy storage cabinet from the energy of battery pack or the energy that fills from PCS module string.Realize battery balanced with less energy loss.

3) by in the string charging process or in the battery discharge procedure, control the work period that specific multi-functional branch fills the unit, even make one, also can show as the operating characteristic of battery pile of the indifference of an equalization by the battery pile that battery constituted that has notable difference.Thereby the availability and the reliability of energy-accumulating power station battery pile have been improved greatly.

By above embodiment, the useful technique effect that is brought is as follows:

1, converges the macrocell heap that energy reaches several megawatt hours and be divided into some little interchange energy storage cabinets that have only the hundreds of kilowatt hour existing, reduced the safe operation risk of energy-accumulating power station.

2, do not had high voltage direct current distribution link, saved cost.

3, any batteries fault in the energy-accumulating power station system at most only causes an interchange energy storage cabinet to withdraw from, and in the present embodiment, the power output of energy-accumulating power station only is reduced to 0.95MW from 1MW in this case.

4, make the energy-accumulating power station system can realize modular design, by simple increase the quantity of interchange energy storage cabinet in parallel, can realize the power expanding or the preparation time dilatation of system.

On the basis of present embodiment, also considered following deformation program:

1, framework is identical, but the specific implementation method may be different.May be different such as PCS Module Design power, divide the charge power possibility of filling the unit different, the battery module output voltage may be different, the battery module battery capacity may be different, the quantity that exchanges battery module in the energy storage cabinet may be different, cell stack total voltage may be different, (this programme is the positive and negative 384V that adopts the band mid point to the also possible difference of battery pile output voltage mode, also can adopt single busbar connection 768V), three-phase inverting circuit topology in the PCS module may be different, and the step-down conversion circuit topology may be different.

2, framework has nuance, such as exchanging in the energy storage cabinet with a 50KW module in 25KW module replacement this programme of two parallel connections.

3, framework is identical, such as, because the restriction of battery size, the interchange energy storage cabinet in this programme is made up of four standard industry frames side by side, but also can be to be made of 5 or a rack.Multi-functional branch fills the unit and power brick is the formation battery module of putting together in this programme, also can fill the unit to a plurality of multi-functional branches is placed in the rack, and has only power brick in the battery module, after battery module inserted, the multi-functional branch of installing on power brick in making battery module and the energy storage cabinet-type air conditioner frame filled the unit and couples together by cable.

4, the step-down conversion circuit 56 in the PCS module also can not be placed on the PCS inside modules, makes a module separately.

Should be understood that; application of the present utility model is not limited to above-mentioned giving an example; for those of ordinary skills, can be improved according to the above description or conversion, all these improvement and conversion all should belong to the protection range of the utility model claims.

Claims (10)

1. one kind exchanges the energy storage cabinet, comprises a PCS module and at least one battery module, it is characterized in that described battery module comprises:
The power brick of store electrical energy;
The multi-functional branch of monitoring battery bag fills the unit,
Wherein, described power brick is at least one, and each power brick disposes a described multi-functional branch and fill the unit, and described multi-functional branch fills the unit and connects described power brick.
2. interchange energy storage cabinet according to claim 1 is characterized in that, described PCS module comprises: first current foldback circuit and the soft-start circuit that are connected with battery module;
Second current foldback circuit and the soft-start circuit that are connected with electrical network;
Be arranged on the dc-link capacitance on the dc bus;
The energy of battery module is reverse into alternating current sends into grid generation, or will offer the inverter circuit of the power brick charging in the battery module after the rectification of electrical network energy;
Each circuit working state in the control PCS module, and the control circuit of management battery module;
Fill the telecommunication circuit that the unit communicates with energy-accumulating power station watch-dog and described multi-functional branch;
Wherein, first current foldback circuit and soft-start circuit, dc-link capacitance, inverter circuit, second current foldback circuit and soft-start circuit connect successively, and control circuit connects telecommunication circuit, first current foldback circuit and soft-start circuit, inverter circuit, second current foldback circuit and soft-start circuit.
3. interchange energy storage cabinet according to claim 1 is characterized in that, described PCS module comprises: first current foldback circuit and the soft-start circuit that are connected with battery module;
Second current foldback circuit and the soft-start circuit that are connected with electrical network;
Be arranged on the dc-link capacitance on the dc bus;
The energy of battery module is reverse into alternating current sends into grid generation, but or will offer the inverter circuit of the twocouese work of the power brick heap charging in the battery module after the rectification of electrical network energy;
The first control circuit of each circuit working state in the control PCS module;
First telecommunication circuit that communicates with the energy-accumulating power station watch-dog;
Wherein, first current foldback circuit and soft-start circuit, dc-link capacitance, inverter circuit, second current foldback circuit and soft-start circuit connect successively, and first control circuit connects first telecommunication circuit, first current foldback circuit and soft-start circuit, inverter circuit, second current foldback circuit and soft-start circuit.
4. interchange energy storage cabinet according to claim 3, it is characterized in that, described interchange energy storage cabinet also comprises a battery module control unit, described battery module control unit is used to receive multi-functional branch and fills the interior data of power brick that transmit the unit, control the operating state that multi-functional branch fills the unit, data to power brick are carried out analyzing and processing, and battery data and analysis processing result are transmitted the first control circuit of PCS and the watch-dog of outside;
Described battery module control unit comprises: the second control circuit of control battery module; Reach with the energy-accumulating power station watch-dog, with first control circuit, fill the second communication circuit that the unit communicates with described multi-functional branch; Wherein, second control circuit connects the second communication circuit, and described second communication circuit connects energy-accumulating power station watch-dog, first control circuit and multi-functional branch respectively and fills the unit.
5. interchange energy storage cabinet according to claim 1 is characterized in that, described multi-functional branch fills the unit and comprises:
Be used for control output voltage and electric current, the electrical isolation between output and the input is provided, realize single battery charging, the power conversion circuit that contains isolating transformer of powering simultaneously for single-chip microcomputer;
Be used for control signal, open or turn-off the output control circuit of output circuit according to single-chip microcomputer;
Be used for and will give single-chip microcomputer after by electrical isolation from the signal of communication of outside, the communication signal that single-chip microcomputer is sent sends outside optical coupling isolation circuit to after by electrical isolation simultaneously;
Be used to control the single-chip microcomputer that multi-functional branch fills the unit;
Wherein, the power conversion circuit, output control circuit, the optical coupling isolation circuit that contain isolating transformer are connected to single-chip microcomputer respectively, and the power conversion circuit that contains isolating transformer connects output control circuit.
6. interchange energy storage cabinet according to claim 5 is characterized in that, described multi-functional branch fills the unit and also comprises: detect first temperature sensor that multi-functional branch fills temperature in the unit, it is connected to single-chip microcomputer.
7. interchange energy storage cabinet according to claim 5 is characterized in that, is provided with second temperature sensor in the described battery pile, is used to detect the temperature of battery, and passes to described single-chip microcomputer.
8. interchange energy storage cabinet according to claim 2 is characterized in that, described PCS module also comprises: detect the voltage and current testing circuit of the voltage and current of described interchange energy storage cabinet, described voltage and current testing circuit connects control circuit.
9. interchange energy storage cabinet according to claim 2, it is characterized in that, described PCS module also comprises fills the step-down conversion circuit of unit as power supply with offering multi-functional branch after the busbar voltage reduction, and described step-down conversion circuit connects dc-link capacitance and control circuit.
10. an energy-accumulating power station system is characterized in that, comprises any described interchange energy storage cabinet in the claim 1 to 9 in the described energy-accumulating power station system.
CN2010202262275U 2010-06-09 2010-06-09 AC energy storage cabinet and energy storage power station system CN201726205U (en)

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Application Number Priority Date Filing Date Title
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Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102815427A (en) * 2012-09-10 2012-12-12 苏州美尔科自动化设备有限公司 Full-automatic labeling device
WO2013143165A1 (en) * 2012-03-30 2013-10-03 智晖有限公司 Method for realizing energy storage of power grid
CN104377786A (en) * 2014-03-24 2015-02-25 中国能源建设集团广东省电力设计研究院 Monitoring method and system of battery energy storage station
CN104600725A (en) * 2013-10-31 2015-05-06 西门子公司 Photovoltaic series compensation system

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2013143165A1 (en) * 2012-03-30 2013-10-03 智晖有限公司 Method for realizing energy storage of power grid
CN102815427A (en) * 2012-09-10 2012-12-12 苏州美尔科自动化设备有限公司 Full-automatic labeling device
CN104600725A (en) * 2013-10-31 2015-05-06 西门子公司 Photovoltaic series compensation system
CN104600725B (en) * 2013-10-31 2017-09-29 西门子公司 photovoltaic series compensation system
CN104377786A (en) * 2014-03-24 2015-02-25 中国能源建设集团广东省电力设计研究院 Monitoring method and system of battery energy storage station
CN104377786B (en) * 2014-03-24 2019-01-25 中国能源建设集团广东省电力设计研究院 A kind of monitoring method and monitoring system at battery energy storage station

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