CN109309396A - A kind of energy-storage battery parallel charge-discharge device - Google Patents
A kind of energy-storage battery parallel charge-discharge device Download PDFInfo
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- CN109309396A CN109309396A CN201710627708.3A CN201710627708A CN109309396A CN 109309396 A CN109309396 A CN 109309396A CN 201710627708 A CN201710627708 A CN 201710627708A CN 109309396 A CN109309396 A CN 109309396A
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
- H02J7/0016—Circuits for equalisation of charge between batteries using shunting, discharge or bypass circuits
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- H02J7/0022—
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0068—Battery or charger load switching, e.g. concurrent charging and load supply
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- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
A kind of energy-storage battery parallel charge-discharge device, including multiple energy-storage battery modules, it is characterized by: the energy-storage battery module multiple DC-dc conversion units and dc circuit breaker, PC control unit, main circuit breaker, DC-AC conversion unit correspondingly, a kind of energy-storage battery parallel charge-discharge device is provided, different model, the energy-storage battery module of different capabilities can realize parallel connection by the device, and the charge-discharge electric power of each energy-storage module can configure.
Description
[technical field]
The present invention relates to the developments of electrical engineering field power supply device, the more particularly, to dress of energy-storage battery parallel charge-discharge
It sets.
[background technique]
Existing frequently-used power energy-storage battery charger can be divided into onboard charger and off-board charger, and onboard charger is general
Be designed as small-power charging, the charging time is long, and off-board charger is typically designed as high-power charging, quality and volume also compared with
Greatly.The demand of energy-storage battery charge and discharge device is miniaturization and modularization, and can satisfy demand power.It was verified that can be with
It is in parallel by completing battery module by DC-DC conversion device, new device is formed, energy-storage battery charge and discharge may be implemented
The miniaturization of electric installation, modularization, and can be by centainly configuring to obtain biggish stored energy capacitance and rated power, battery module
It can be different encapsulation, different capabilities.
In multiple battery module parallel operations, if can charge power to each battery module or discharge power match
It sets, so that it may accomplish the scheduling that each energy-storage module charge and discharge are done with echelon, more reasonably utilize stored energy capacitance, improve energy storage electricity
Pond utilization efficiency does not have in small-power charge and discharge device and reaches claimer, and The present invention gives the energy storage electricity for reaching such demand
Pond parallel charge-discharge device.
[summary of the invention]
In order to solve the above-mentioned technical problem, it is necessary to which a kind of energy-storage battery parallel charge-discharge device, different model, different appearances are provided
The energy-storage battery module of amount can realize parallel connection by the device, and the charge-discharge electric power of each energy-storage module can configure.
The present invention provides a kind of energy-storage battery parallel charge-discharge device, including multiple energy-storage battery modules, the energy storage electricity
Pond module multiple DC-dc conversion units and dc circuit breaker, PC control unit, main circuit breaker, straight correspondingly
Stream-exchange conversion unit, the DC-dc conversion unit by accessing battery are powered to control unit, solve energy-storage battery
It is used in parallel, meet the application demand of energy-storage battery miniaturization, dispersion access, can not power off and export lasting feelings in controller
Some battery module is replaced under condition；And on the basis of power application electronic technology DC-DC conversion device is in parallel, phase is proposed
The stream and power configuration strategy answered, each battery module power can be separately configured, and be actively engaged in the adjusting of DC bus-bar voltage；No
Same type, different capabilities energy-storage battery can be realized by the present apparatus in parallel, and each energy-storage battery module charge-discharge electric power can
Separate configurations, while having DC-AC conversion unit, meet grid-connected or off-grid operation；
From hardware topology, the present invention is in parallel by multiple DC-dc conversion unit high-voltage ends, constitutes DC bus, low-pressure end
As energy-storage battery interface；The DC terminal of DC-AC conversion unit is connected through main circuit breaker with DC bus positive and negative anodes, hands over
End, which is flowed, as device exchanges interface；With communication line between control unit and DC-dc conversion unit, DC-AC conversion unit
It is connected, it is the variator unit that can access photovoltaic that original DC-AC conversion unit, which is expanded, and photovoltaic is straight through specific direct current-
It flows converter unit and accesses DC bus；Increase DC output interface, accesses DC bus through specific DC-dc conversion unit.
It is described to allow to access energy-storage battery module or direct current for DC-dc conversion unit low-pressure end in parallel
Source, DC-dc conversion unit high-voltage end is in parallel, DC bus is constituted, with dc circuit breaker between low-pressure end and energy-storage battery
Connection；Each DC-dc conversion unit in addition to main circuit, further include independent control circuit, protection circuit, telecommunication circuit and
Display circuit can be independently completed DC-dc conversion function and defencive function, can receive the monitoring of control unit；Directly
Stream-DC converting unit is connected by RS485 with control unit, and logical with high-speed communication means such as CAN2.0 buses between each unit
Letter transmits this unit electric parameter, and auxiliary, which improves, flows precision.
The direct current of the DC-AC conversion unit terminates on DC bus, DC terminal operating voltage range and straight
It is consistent to flow busbar voltage range, exchange end is used as energy-storage battery parallel charge-discharge device output interface, access AC load or simultaneously
Enter public electric wire net.DC-AC conversion unit further includes independent control circuit, protection circuit, telecommunication circuit in addition to main circuit
And display circuit, it can be independently completed inversion function, rectification function, defencive function and information record function, and can receive
The monitoring of control unit；DC-AC conversion unit is connected by RS485 with control unit.
Described control unit is by DC bus powered, between each DC-dc conversion unit and DC-AC conversion unit
It is communicated with RS485, while being wirelessly communicated by wireless device and external device.Control unit include central processing unit, memory,
Power management chip, digital quantity input/output interface, analog input and output interface, communication interface, acquisition each unit operation ginseng
Number information, makes operation and judgement, provides command adapted thereto, act on corresponding units；Control unit is the load that control strategy is implemented
Body, to realize the processing when scheduling of each unit work and failure occur, and can by APP or web data form with
Host computer interaction.
The independent start and stop in local of the DC-dc conversion unit, the DC-dc conversion unit for accessing energy-storage battery can
To be considered as an independent continuous-current plant, it is closed the breaker of energy-storage battery and DC-dc conversion unit, DC-DC
Converter unit control circuit is started to work, and local start-stop button can complete output direct current to local control chip start stop signal
The foundation and stopping of busbar voltage.
DC-dc conversion unit, low-pressure end access energy-storage battery module are operable with and fill for its low-pressure end
Electricity condition, discharge condition and standby mode, standby mode refer to the state between charged state and discharge condition.For its height
For pressure side, control model is three kinds common, constant pressure, constant current and equal stream mode.
The high-pressure side parallel running of the multiple DC-dc conversion unit, low-pressure end are respectively connected to energy-storage battery module,
To keep stabilization and the power of translation circuit configurable, converter unit should be made to work in equal stream mode.DC bus-bar voltage control
The variation that electric current can be exported according to device charge and discharge each unit automatically adjusts.
DC-dc conversion cell operation refers to that its control strategy is based on the sagging method of direct current and voltage electricity in equal stream mode
Double-closed-loop control is flowed, each unit exports electric current relative equilibrium；Wherein control outer ring is Voltage loop, and inner ring is electric current loop, in addition
Actively equal Flow Policy, i.e. increase average current compare link, are added in the given place of outer ring reference value as compensation rate.Switching tube is opened
OFF signal modulates (PWM) technology using pulse width.
Device exempts to operate self-starting after the busbar voltage is established, and accesses energy-storage battery module, need to only start a direct current-
DC converting unit is allowed to start to work, and can power for control unit, control unit detect each DC-dc conversion unit and
DC-AC conversion cell operation state, under send instructions and start remaining DC-dc conversion unit and DC-AC conversion
Unit, system start externally to export, and system starts complete standby work status.
Lower replacement energy-storage battery module is stablized in the output, and after accessing multiple energy-storage battery modules, energy-storage battery is substantially
Realize that physics is in parallel by converting means, after system starts work, it is not necessary to halt system, it only need to be in DC-dc conversion unit work
Make in the case where being greater than two and being enough to supply loaded work piece at this time, issues and stop by local start-stop button or host computer APP
Only instruction stops the output of a DC-dc conversion unit, disconnects the road dc circuit breaker, reapposes new energy storage electricity
(or online) replacement energy-storage battery module can be realized under so-called output stabilization in pond.
[Detailed description of the invention]
It, below will be to embodiment and technology in order to illustrate more clearly of feature of the invention, element, step, advantage and characteristic
Attached drawing needed in scheme description is definitely introduced.Below by way of detailed description and addition attached drawing related to this
To further clarify.
Fig. 1 is to indicate a kind of structure chart of the simple embodiment of energy-storage battery parallel charge-discharge device of the present invention；
Fig. 2 is to indicate a kind of structure chart of energy-storage battery parallel charge-discharge device main embodiment of the present invention；
Fig. 3 is the port name for indicating apparatus of the present invention outside port, port numbers, function and embodiment electrical parameter value；
Fig. 4 is the equivalent circuit diagram for indicating the unit parallel connection of apparatus of the present invention DC-dc conversion；
Fig. 5 is that output characteristic curve is arranged when indicating n unit parallel connection of energy-storage battery parallel charge-discharge device of the present invention；
Fig. 6 is to indicate the sagging equal Flow Policy flow chart of control of energy-storage battery parallel charge-discharge device unit of the present invention；
Fig. 7 is to indicate energy-storage battery parallel charge-discharge device active sharing control strategic process figure of the present invention；
Fig. 8 is the configuration design main view for indicating energy-storage battery parallel charge-discharge device of the present invention.
Fig. 9 be the configuration design rearview for indicating energy-storage battery parallel charge-discharge device of the present invention.
[specific embodiment]
To be easy to understand the technical means, the creative features, the aims and the efficiencies achieved by the present invention, below with reference to specific
Embodiment, the present invention is further explained.
Referring to Fig. 1, a kind of simple example structure figure of energy-storage battery parallel charge-discharge device of the present invention；Please refer to figure
2, a kind of main embodiment structure chart of energy-storage battery parallel charge-discharge device of the present invention increases photovoltaic incoming end and 24V is straight
Galvanic electricity output end.
In conjunction with the realization of Fig. 1 and Fig. 2 embodiment description physics parallel connection of the invention to energy-storage battery module provided.
Energy-storage battery parallel charge-discharge device disclosed by the invention mainly has multiple DC-dc conversion unit high-voltage ends
Parallel connection constitutes DC bus, and low-pressure end is as energy-storage battery interface；The DC terminal of DC-AC conversion unit is through main circuit breaker
It is connected with DC bus positive and negative anodes, exchange end exchanges interface as device；It is control unit and DC-dc conversion unit, straight
It is connected between stream-exchange conversion unit with communication line, constitutes simple embodiment.
Energy-storage battery parallel charge-discharge device disclosed by the invention, if by DC-AC conversion unit in simple embodiment
The AC/DC unit being replaced by Fig. 2, the combination of DC/DC_a, DC/DC_b, photovoltaic is accessed through DC/DC_b, then is connect through DC/DC_a
To switch Ka, switch Ka is another to flank DC bus, constitutes main embodiment of the invention.
It will include AC/DC unit in Fig. 2, be referred to as DC-AC conversion list in the dotted line frame of DC/DC_a, DC/DC_b
Member.
DC-dc conversion cells D C/DC_1, DC/DC_2 ... the DC/DC_10, low-pressure end connect direct current interruption
Device is two line passages, and cell terminal as device is drawn in the breaker other side, to access energy-storage battery module or directly
Galvanic electricity source, with positive wiring termination energy-storage battery anode, negative wiring terminates energy-storage battery cathode；Each DC-dc conversion unit is high
Pressure side is in parallel, is connected on the DC bus copper bar of device, DC bus is divided into positive copper bar and cathode copper bar.
The DC-AC conversion unit claims DC terminal with the port connecting breaker Ka, and DC terminal connects through breaker Ka
It is connected to the DC bus copper bar of device, positive and negative anodes are corresponding, and its DC terminal operating voltage range and DC bus-bar voltage range
Unanimously；The photovoltaic terminals being connect with the breaker Kb photovoltaic interface external as device；End is exchanged as energy-storage battery parallel connection
Charge and discharge device output interface accesses AC load or is incorporated to public electric wire net.
Described control unit, power supply wiring are terminated on DC bus, and positive and negative anodes are corresponding, are become with each DC-DC
It changes RS485 communication line between unit and DC-AC conversion unit to connect, shares tri- lines of 485A, 485B, GND, while passing through nothing
Line data transmit-receive module is carried out wireless communication with external device.In the embodiment that Fig. 1 is provided, direct current-is connected on DC bus
The feeder ear of exchange conversion unit control unit, it through DC-dc conversion is 5V for controller that the power supply of control unit, which is bus,
It uses, is communicated between control unit and each DC-dc conversion unit and DC-AC conversion unit with RS485, control unit connects
It is connected to display board.
In conjunction with Fig. 3, description is made to the interface type of apparatus of the present invention each unit, parameter.
Apparatus of the present invention external interface is broadly divided into electric interfaces and communication interface, and electric interfaces include that 10 groups of batteries are rectified
Negative terminals, 220V AC terminal, 24V direct current terminals, photovoltaic terminals, communication connection end includes Ethernet interface, wireless
The wireless connection of device.
Wherein each DC-dc conversion unit, have the positive and negative terminals of its independent battery-end, DC bus terminals,
485 communication ends, external display interface, CAN communication interface, program download interface.DC-dc conversion unit and its corresponding battery
Module, the device in kind of display board every two composition one, claim battery case, therefore device at most accesses five groups of battery cases, can also root
The quantity of battery case is suitably reduced according to demand.The DC-dc conversion list of rated power 1000W is applied in the embodiment of the present invention
Member, DC-dc conversion element cell end nominal voltage 48V.
DC-AC conversion unit includes forming current transformer case including AC/DC unit, DC/DC_a, DC/DC_b.It is led
Interface is wanted to have DC bus terminals, 220V AC terminal, 485 communication ends, program download interface.
Control unit and pre-charge circuit device and 24V DC-dc conversion unit form device in kind, claim control cabinet,
Control cabinet further includes main circuit breaker, exchange end breaker, precharge control circuit, display circuit, DC bus copper bar, and is respectively connect
Line end.Its primary interface have DC bus terminals, 220V exchange to external terminal, 24V direct current terminals, 485 communication ends, with
The too wireless connection of network interface, wireless device.
Next the characteristics of detailed each hardware module of description should have and working principle.
Each DC-dc conversion unit further includes independent control circuit, protection circuit, communication electricity in addition to main circuit
Road and display circuit can be independently completed DC-dc conversion function and defencive function, and can receive the prison of control unit
Control.DC-dc conversion unit is connected by RS485 with control unit, and with high-speed communications such as CAN2.0 buses between each unit
Mode communicates, and transmits this unit electric parameter, and auxiliary, which improves, flows precision.
Each DC-dc conversion unit passes through input-output (DIDO) interface connection display board respectively, and has on display board
Start-stop button, when no host computer connects, local start-stop button provides start stop signal, has host computer connection, then sends out start stop signal
It send to host computer, host computer is waited to issue start and stop instruction.
CAN2.0 bus mode is used between each DC-dc conversion unit, uses RS485 communication party with host computer
Formula.Charge/discharge unit and host computer communication interaction content specifically include that host computer to sending instructions under charge/discharge unit: starting, stop
Only, current-order etc.；The unidirectional host computer of charge and discharge transmits information: cell voltage, battery current, battery dump energy (SOC), straight
Flow busbar voltage, charge/discharge unit working condition etc..
Digital signal processor (DSP) is used inside charge/discharge unit, makees double-closed-loop control on control strategy, in electric current loop
Ring, Voltage loop outer loop control mode, realizes the two-way changing of electric current.
For low-side power, DC-dc conversion unit can work: 1. standby modes；2. charged state；3. electric discharge
State.
DC-dc conversion unit starting process is easy, (can rise from charged state (reduction voltage circuit) or discharge condition
Volt circuit) return to standby mode, can also return to sleep state from standby mode, standby mode refer between charge and discharge state it
Between a kind of working condition, sleep state refers on main circuit state when safe metal-oxide-semiconductor turns off.The safety of system when to guarantee in parallel
Operation, in the case where entering boost/buck mode from buck/boost mode, it is necessary to pass through standby mode.Standby mode
It is in commutation process, electric current is stepped down to zero, the mistake for the demand input/output value being then reversely stepped up as required
Journey.
DC-AC conversion unit in addition to main circuit, further include independent control circuit, protection circuit, telecommunication circuit and
Display circuit can be independently completed inversion function, rectification function, defencive function and information record function, and can receive control
The monitoring of unit processed.DC-AC conversion unit is connected by RS485 with control unit.
Control unit includes central processing unit, memory, power management chip, digital quantity input/output interface, analog quantity
Input/output interface, communication interface acquire each unit trip information, make operation and judgement, provide command adapted thereto, act on
In corresponding units.Control unit is the carrier that control strategy is implemented, and the scheduling of each unit work and failure occur to realize
When processing, and can be interacted by APP or web data form with host computer.Control unit primary interface has power supply, number
Measure input and output (DIDO) mouth, I2C port, RS485 interface, USB interface, wireless interface.
Control unit mainly handles the trip information of each unit transmission, makes operation and judgement, provides command adapted thereto,
Corresponding units are acted on, control unit is the carrier of control strategy, and the scheduling of each unit work and failure occur to realize
When processing, and can be interacted by APP or web data form with host computer.Node Controller is respectively set as ipc monitor
Standby operation, and instruction adjustment is provided with slow communication, it is communicated between each DC-DC device by CAN2.0, high-speed traffic
It improves and flows precision.
Next Fig. 4-Fig. 7 is combined, the System Working Principle and realization function to apparatus of the present invention are described in detail.
A kind of energy-storage battery parallel charge-discharge device of the present invention, and each modular power can be separately configured, the realization base of function
In the parallel connection of DC-DC transfer circuit unit and both of which stream and power regulation strategy.
From system operation, it is straight that energy-storage battery parallel charge-discharge device of the present invention can not only complete single direct current-
Flow converter unit the independent start and stop in local, the high-pressure side parallel running of multiple DC-dc conversion units, exchange be incorporated into the power networks or
Off-grid operation can also complete device after busbar voltage is established and exempt to operate self-starting, export and replace energy-storage battery module under stablizing,
The separate configurations of single energy-storage battery module charge-discharge electric power extend function with host computer by wired or wireless communication mode
For the operation of access photovoltaic and DC port power supply can be provided.
The physics for completing energy-storage battery module by DC-dc conversion unit is in parallel, its working principle is set forth below.
When each DC-dc conversion unit parallel connection, energy-storage battery is accessed, each unit should work in sagging control mould
Formula avoids battery from being connected directly bring overcurrent, and control strategy used in apparatus of the present invention is based on the sagging control of direct current, in voltage
Current double closed-loop control on the basis of, with Uref=Um-R*Io substitution double-closed-loop control Voltage loop give constant, wherein Um be to
Voltage value corresponding to catenary zero current is fixed, the corresponding sagging curve coefficient of R, Uref is the voltage of voltage and current double closed-loop
Given, Io is current sampling data.
For DC-dc conversion cell operation in sagging control model, basic principle is thevenin equivalent circuit, by energy storage electricity
Pond and converter unit are equivalent to the source-series fixed value resistance of DC voltage jointly, equivalent for output characteristics.
Referring to Fig. 5, set sagging curve, Um is set as 56V in embodiment, and R is set as 0.1, and each device works
In sagging control model, when in parallel, different loads characteristic corresponds to different operating points.It is only that DC/DC converter is able to satisfy separate unit
Vertical work, is also able to satisfy more networking work in parallel, and DC bus-bar voltage control can export electric current according to DC/DC converter
Variation automatic adjustment.
Embodiment DC-DC (DC/DC) converter design is designed according to 1000W power grade, A editions design direct currents
Busbar voltage control is with output current relationship according to following design.When separate unit DC/DC converter stable operation, DC bus is steady
The control of state voltage and output electric current (output is positive) relationship such as Fig. 5, shown in n=1.
In the case where no PC control, more DC/DC converter parallel connection stable operations, DC bus steady state voltage
Control and output electric current (output is positive) relationship are as shown in Figure 5.Wherein: 1) n is the number that DC/DC converter puts into operation
Amount；2) ordinate is d-c bus voltage value；Abscissa is the output electric current of separate unit DC/DC；3) each DC/DC transformation
Device sharing control.
Multiple similar circuits can complete parallel connection, because voltage is unbalanced when reducing the direct physics parallel connection of battery, generation
High current, the very big electric energy being consumed in internal resistance, because circuit equivalent resistance is virtual resistance under sagging control, not because there is electric current
It flows through and generates loss, to realize that the physics of battery is in parallel, not only reduced the risk of harm to battery, but also improve battery and fill
The actual efficiency of electric discharge improves battery working performance.
Next the main realization for describing power configuration function in the present invention.
Charge/discharge unit will use droop method and active current-equalizing method, according to demand realize each unit mean power output with
And difference power output.Actively stream basic principle is to do closed-loop control to equal stream error signal, is sent and is instructed by host computer
Average current is modified, it can be achieved that difference power output controls.
In the case where there is PC control control, more DC/DC converter parallel connection stable operations, DC bus stable state
Voltage control and output electric current (output is positive) relationship are as shown in Figure 5.Each DC/DC is realized according to host computer instruction to each
From the independent control of electric current.
The separate configurations of the single energy-storage battery module charge-discharge electric power when DC-dc conversion unit parallel connection, propose
The control strategy of two kinds of configuration each unit power.
Referring to Fig. 6, the small-sized sagging sharing control strategic process figure of energy-storage battery charge and discharge device.Sagging sharing control
Under, each unit power output is almost the same, but has the fine difference of circuit hardware to cause actual current incomplete consistent, and host computer is logical
DC-dc conversion unit acquisition battery information is crossed, after carrying out assessment calculating to battery status, obtains each unit expectation operation
Performance number or current value, send instructions under node control unit adjusting, adjusts sagging curve upper and lower translation or changes sagging coefficient, i.e.,
Change the value of Vm or the value of R in Fig. 7, passes to corresponding DC-dc conversion unit, change the charge and discharge shape of respective battery
State, to reach to the stream of battery charging and discharging power and configuration.
Referring to Fig. 7, small-sized energy-storage battery charge and discharge device active sharing control strategic process figure.Based on the sagging control of direct current
System increases compensation tache in voltage reference value input, completes the communication between each unit by CAN bus, calculates each dress
It sets electric current and acquires average value, and multiplied by current regulation coefficient (initial value 1), each unit bus current and average current value
It makes comparisons, is added in the given place of Voltage loop as compensation, to improve the essence of the stream between each DC-dc conversion unit through PI link
Degree, host computer obtain the performance number or current value of each unit expectation operation according to battery status, corresponding corresponding control target,
It is scaled corresponding current regulation coefficient, each DC-dc conversion unit is issued to, accomplishes the tune to each power in parallel units
Section.
Next the replacement of its start-up and shut-down control and online battery is described in detail.
Start-up course, device exempts to operate self-starting after the busbar voltage is established, and accesses energy-storage battery module, only needs to start
One DC-dc conversion unit is allowed to start to work, and can power for control unit, control unit detects each DC-DC
Converter unit and DC-AC conversion cell operation state, under send instructions and start remaining DC-dc conversion unit and straight
Stream-exchange conversion unit, system start externally to export, and system starts complete standby work status.
Lower replacement energy-storage battery module is stablized in the output, and after accessing multiple energy-storage battery modules, energy-storage battery is substantially
Realize that physics is in parallel by converting means, after system starts work, it is not necessary to halt system, it only need to be in DC-dc conversion unit work
Make in the case where being greater than two and being enough to supply loaded work piece at this time, issues and stop by local start-stop button or host computer APP
Only instruction stops the output of a DC-dc conversion unit, disconnects the road dc circuit breaker, reapposes new energy storage electricity
(or online) replacement energy-storage battery module can be realized under so-called output stabilization in pond.
The operating process of battery replacing is as follows: 1. press primary " starting/stopping " button；2. equal " RUN "s indicator light is put out
Battery replacing is carried out after going out；3. after the completion of replacement, pressing primary " starting/stopping " after button, system is restored to work normally.?
When multiple battery modules pass through the device parallel connection, become online replacement battery.
Next it explains to configuration design of the invention.
In conjunction with Fig. 8, the configuration design figure of the present apparatus is provided, the present apparatus uses modularized design mode, forms cabinet body, implements
Divide current transformer case, energy-storage battery case, control cabinet in example, modularized design is built, current transformer case and energy-storage battery case DC bus
End is connected to control cabinet, and external output port is respectively positioned on control cabinet, and current transformer case is connected to photovoltaic end, and energy-storage battery case includes two
Energy-storage battery module.
Wherein, current transformer case mainly includes DC-AC converter, have access photovoltaic with exchange fan-out capability, directly
Stream end is connected with 48V DC bus, and main port includes 48V DC bus end interface, photovoltaic end interface, exchange end interface, 485
Communication interface.
Energy-storage battery case each includes two energy-storage units, is mainly broken including DC-dc conversion unit, direct current in design
Road device and energy-storage battery are packed into space, and main port includes cell terminal, DC bus interface, 485 interfaces, CAN interface, go back
Including on panel to outer display board.
Controller case mainly includes that controller, 48V bus main circuit breaker, ac output end breaker, DC output end are disconnected
Road device, direct current 24V converter unit, primary interface include to the DC bus terminals of current transformer case, ac output end (through exchanging
Exported again after output end breaker), 485 communication interfaces, DC bus terminals, 485 communication ends to energy-storage battery case also wrap
Include the exchange end interface externally exported, 24V direct current end interface, wireless transmitter interface, button and display board.
Configuration design of the present invention is beautiful and generous, and high water proof and dust proof grade IP65, modularization assembling facilitates portable.
The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention.The technology of the industry
Personnel are it should be appreciated that the present invention is not limited to the above embodiments, and the above embodiments and description only describe this
The principle of invention, without departing from the spirit and scope of the present invention, various changes and improvements may be made to the invention, these changes
Change and improvement all fall within the protetion scope of the claimed invention.The claimed scope of the invention by appended claims and its
Equivalent thereof.
Claims (7)
1. a kind of energy-storage battery parallel charge-discharge device, including multiple energy-storage battery modules, it is characterised in that: the energy-storage battery
Module multiple DC-dc conversion units and dc circuit breaker, PC control unit, main circuit breaker, direct current-correspondingly
Exchange conversion unit, the DC-dc conversion unit by accessing battery are powered to control unit, solve the parallel connection of energy-storage battery
It uses, meets the application demand of energy-storage battery miniaturization, dispersion access, it can be in the case where controller power off and exports lasting
Replace some battery module；And on the basis of power application electronic technology DC-DC conversion device is in parallel, propose corresponding
Stream and power configuration strategy, each battery module power can be separately configured, and be actively engaged in the adjusting of DC bus-bar voltage；Inhomogeneity
Type, different capabilities energy-storage battery can be realized by the present apparatus in parallel, and each energy-storage battery module charge-discharge electric power can be independent
Configuration, while having DC-AC conversion unit, meet grid-connected or off-grid operation；
From hardware topology, the present invention is in parallel by multiple DC-dc conversion unit high-voltage ends, constitutes DC bus, low-pressure end
As energy-storage battery interface；The DC terminal of DC-AC conversion unit is connected through main circuit breaker with DC bus positive and negative anodes, hands over
End, which is flowed, as device exchanges interface；With communication line between control unit and DC-dc conversion unit, DC-AC conversion unit
It is connected, it is the variator unit that can access photovoltaic that original DC-AC conversion unit, which is expanded, and photovoltaic is straight through specific direct current-
It flows converter unit and accesses DC bus；Increase DC output interface, accesses DC bus through specific DC-dc conversion unit；
It is described to allow to access energy-storage battery module or DC power supply for DC-dc conversion unit low-pressure end in parallel, directly
Stream-DC converting unit high-voltage end is in parallel, constitutes DC bus, is connected between low-pressure end and energy-storage battery with dc circuit breaker；
Each DC-dc conversion unit further includes independent control circuit, protection circuit, telecommunication circuit and display in addition to main circuit
Circuit can be independently completed DC-dc conversion function and defencive function, can receive the monitoring of control unit；Direct current-is straight
Stream converter unit is connected by RS485 with control unit, and is passed between each unit with the communication of the high-speed communication means such as CAN2.0 bus
This unit electric parameter is passed, auxiliary, which improves, flows precision；
The direct current of the DC-AC conversion unit terminates on DC bus, and DC terminal operating voltage range and direct current are female
Line voltage range is consistent, and exchange end accesses AC load or be incorporated to public affairs as energy-storage battery parallel charge-discharge device output interface
Common-battery net；DC-AC conversion unit further includes independent control circuit, protects circuit, telecommunication circuit and show in addition to main circuit
Show circuit, inversion function, rectification function, defencive function and information record function can be independently completed, and control can be received
The monitoring of unit；DC-AC conversion unit is connected by RS485 with control unit；
Described control unit by DC bus powered, between each DC-dc conversion unit and DC-AC conversion unit with
RS485 communication, while being wirelessly communicated by wireless device and external device；Control unit includes central processing unit, memory, electricity
Source control chip, digital quantity input/output interface, analog input and output interface, communication interface acquire each unit operating parameter
Information makes operation and judgement, provides command adapted thereto, acts on corresponding units；Control unit is the carrier that control strategy is implemented,
To realize the processing when scheduling of each unit work and failure occur, and can by APP or web data form with it is upper
Position machine interaction.
2. a kind of energy-storage battery parallel charge-discharge device according to claim 1, it is characterised in that: the DC-DC
The independent start and stop in the local of converter unit, the DC-dc conversion unit for accessing energy-storage battery can be considered as an independent direct current
Source device, is closed the breaker of energy-storage battery and DC-dc conversion unit, and DC-dc conversion unit control circuit starts
Work, local start-stop button can complete the foundation and stopping of output DC bus-bar voltage to local control chip start stop signal.
3. a kind of energy-storage battery parallel charge-discharge device according to claim 1, it is characterised in that: DC-dc conversion
Unit, low-pressure end accesses energy-storage battery module, for its low-pressure end, is operable with charged state, discharge condition and standby
State, standby mode refer to the state between charged state and discharge condition；For its high-voltage end, control model is common
Three kinds, constant pressure, constant current and equal stream mode.
4. a kind of energy-storage battery parallel charge-discharge device according to claim 1, it is characterised in that: the multiple direct current-
The high-pressure side parallel running of DC converting unit, low-pressure end are respectively connected to energy-storage battery module, for the stabilization for keeping translation circuit
It is configurable with power, converter unit should be made to work in equal stream mode；DC bus-bar voltage control can be each according to device charge and discharge
Unit exports the variation automatic adjustment of electric current.
5. a kind of energy-storage battery parallel charge-discharge device according to claim 1, it is characterised in that: DC-dc conversion
Cell operation refers to that its control strategy is based on the sagging method of direct current and Double closed-loop of voltage and current, each unit are defeated in equal stream mode
Electric current relative equilibrium out；Wherein control outer ring is Voltage loop, and inner ring is electric current loop, and actively equal Flow Policy, i.e. increase are flat in addition
Equal electric current comparing element is added in the given place of outer ring reference value as compensation rate；The switching signal of switching tube uses pulse width tune
(PWM) technology of system.
6. a kind of energy-storage battery parallel charge-discharge device according to claim 1, it is characterised in that: the busbar voltage is built
Device exempts to operate self-starting after vertical, accesses energy-storage battery module, only need to start a DC-dc conversion unit and be allowed to start work
Make, can power for control unit, control unit detects each DC-dc conversion unit and DC-AC conversion cell operation
State, under send instructions and start remaining DC-dc conversion unit and DC-AC conversion unit, system starts externally to export,
System starts complete standby work status.
7. a kind of energy-storage battery parallel charge-discharge device according to claim 1, it is characterised in that: under the output is stablized
Energy-storage battery module is replaced, after accessing multiple energy-storage battery modules, energy-storage battery substantially realizes physics simultaneously by converting means
Connection, after system starts work, it is not necessary to which halt system only need to be greater than two in DC-dc conversion cell operation and be enough to supply this
When loaded work piece in the case where, by local start-stop button or host computer APP issue halt instruction stop a DC-DC
The output of converter unit disconnects the road dc circuit breaker, reapposes new energy-storage battery, and so-called output can be realized and stablize
Under (or online) replacement energy-storage battery module.
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| CN201710627708.3A CN109309396A (en) | 2017-07-28 | 2017-07-28 | A kind of energy-storage battery parallel charge-discharge device |
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| CN201710627708.3A CN109309396A (en) | 2017-07-28 | 2017-07-28 | A kind of energy-storage battery parallel charge-discharge device |
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| CN109842184A (en) * | 2019-03-14 | 2019-06-04 | 深圳英飞源技术有限公司 | A kind of energy-saving control device and method of power-supply system |
| CN110133520A (en) * | 2019-05-30 | 2019-08-16 | 青岛美凯麟科技股份有限公司 | A kind of battery test apparatus and method of parallel current-sharing |
| CN110266066A (en) * | 2019-05-05 | 2019-09-20 | 江苏苏美达机电有限公司 | The battery charge controller and charge control method of more lithium battery group parallel connections |
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| CN113346577A (en) * | 2021-05-25 | 2021-09-03 | 惠州市德赛电池有限公司 | Energy storage battery grid connection method |
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| CN110266066A (en) * | 2019-05-05 | 2019-09-20 | 江苏苏美达机电有限公司 | The battery charge controller and charge control method of more lithium battery group parallel connections |
| CN110133520A (en) * | 2019-05-30 | 2019-08-16 | 青岛美凯麟科技股份有限公司 | A kind of battery test apparatus and method of parallel current-sharing |
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| CN111277028A (en) * | 2020-02-10 | 2020-06-12 | 阳光电源股份有限公司 | Charging system, control method and control device |
| CN111277028B (en) * | 2020-02-10 | 2022-05-24 | 阳光电源股份有限公司 | Charging system, control method and control device |
| CN111342495A (en) * | 2020-04-08 | 2020-06-26 | 阳光电源股份有限公司 | Renewable energy source-energy storage hybrid power generation system |
| CN111342495B (en) * | 2020-04-08 | 2022-04-08 | 阳光电源股份有限公司 | Renewable energy source-energy storage hybrid power generation system |
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| CN113659683A (en) * | 2021-08-26 | 2021-11-16 | 四川科陆新能电气有限公司 | Virtual internal resistance control method for battery inter-cluster balance |
| CN113659683B (en) * | 2021-08-26 | 2023-11-21 | 四川科陆新能电气有限公司 | Virtual internal resistance control method for balancing among battery clusters |
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| CN116413600B (en) * | 2023-03-14 | 2024-01-30 | 江苏东源电器集团股份有限公司 | Energy storage test system and test method thereof |
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