CN110266028A - A kind of modularized dc energy-storage system - Google Patents
A kind of modularized dc energy-storage system Download PDFInfo
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- CN110266028A CN110266028A CN201910476240.1A CN201910476240A CN110266028A CN 110266028 A CN110266028 A CN 110266028A CN 201910476240 A CN201910476240 A CN 201910476240A CN 110266028 A CN110266028 A CN 110266028A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 86
- 230000001264 neutralization Effects 0.000 claims abstract description 5
- 239000003990 capacitor Substances 0.000 claims description 14
- 230000002452 interceptive Effects 0.000 claims description 10
- 238000004891 communication Methods 0.000 claims description 7
- 230000005611 electricity Effects 0.000 claims description 6
- 230000007274 generation of a signal involved in cell-cell signaling Effects 0.000 claims description 5
- 230000000694 effects Effects 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 4
- 239000000969 carrier Substances 0.000 description 2
- 230000000295 complement Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000875 corresponding Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000000178 monomer Substances 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
Classifications
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
-
- 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
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
- H02J3/382—Dispersed generators the generators exploiting renewable energy
Abstract
The invention discloses a kind of modularized dc energy-storage systems, including master controller, from controller, grid-connected reactor, three level energy-storage modules and battery unit, battery unit includes the first battery and the second battery to form series arm, the electrode input end of the anode three level energy-storage modules of connection of series arm, the cathode of series arm connects the negative input of three level energy-storage modules, and the neutral input end of three level energy-storage modules is connected between the first battery and the second battery；The output end of three level energy-storage modules is sequentially connected in series, and the output end of the three level energy-storage modules to rank the first connects one end of grid-connected reactor, the anode of DC grid outside the other end connection of grid-connected reactor comes the cathode of the output end connection DC grid of the three level energy-storage modules at end；It is connect from controller with three level energy-storage modules.The present invention avoids directly connecting between battery, and each energy-storage module uses exportable three level voltage of a controller, reduces cost.
Description
Technical field
The present invention relates to a kind of technical field of energy storage more particularly to a kind of modularized dc energy-storage systems.
Background technique
Currently, the status of energy storage in the power system is more and more important with the extensive use of generation of electricity by new energy.Commonly
Energy-storage battery monomer voltage is relatively low, and a large amount of battery cell is required in large-scale energy storage system and is directly used in series and parallel,
Battery consistency is required high.Not only fault-tolerant ability is poor, but also there are problems that series average-voltage and parallel current-sharing, low efficiency.
Modularization energy storage technology is connected using the A-battery unit of converters control as an independent module
Export high pressure afterwards in groups, be a kind of flexible battery group technology, each energy-storage module can its charge and discharge of independent control and SOC,
The battery of different size difference newness degree can be used in the direct series connection for avoiding a large amount of battery cells, realizes old and useless battery
Echelon utilize, and do not need additionally to configure battery management system (bms).
But currently existing scheme has the following deficiencies:
The major defect of existing modularization energy storage technology is that energy-storage module quantity is more, and each needs to configure independence
Control unit, higher cost.On the other hand, DC distribution technology in power distribution network using more and more, existing energy storage
System is exchange energy-storage system, needs a kind of product that can be suitable for DC grid energy storage.
Summary of the invention
For overcome the deficiencies in the prior art, the purpose of the present invention is to provide a kind of modular multilevel energy-storage system,
The technical issues of it is more that it can solve prior art energy-storage module quantity, needs to configure independent control unit.
The present invention adopts the following technical scheme that realization:
A kind of modular multilevel energy-storage system, which is characterized in that including master controller, several from controller, grid-connected electricity
Anti- device, multiple three level energy-storage modules, several groups battery unit, the three level energy-storage module and the battery unit one are a pair of
It answers, battery unit described in each group includes being sequentially connected in series the first battery and the second battery to form series arm, the series connection
The anode of branch connects the electrode input end of the three level energy-storage module, and the cathode of the series arm connects three level
The negative input of energy-storage module, the neutral input end of the three level energy-storage module are connected to first battery and described the
Between two batteries；The output end of the three level energy-storage module is sequentially connected in series, and the three level energy storage to rank the first
The output end of module connects one end of the grid-connected reactor, and the DC grid outside the other end connection of grid-connected reactor is just
Pole, the output end for coming the three level energy-storage module at end connect the cathode of the DC grid；It is described from controller with
Three level energy-storage modules connect one to one, and described connect from controller with master controller.
Further, the three level energy-storage module include capacitor C1, capacitor C2, controllable switch S1, controllable switch S2, can
Control switch S3 and controllable switch S4, the collector of the emitter connection controllable switch S2 of controllable switch S1, the hair of controllable switch S2
Emitter-base bandgap grading connects the collector of controllable switch S3, the collector of the emitter connection controllable switch S4 of controllable switch S3, controllable switch
The anode of the collector connection series arm of S1, the cathode of the emitter connection series arm of controllable switch S4, the neutrality are defeated
Enter end between the emitter of controllable switch S2 and the collector of controllable switch S3, one end of grid-connected reactor is connected to controllably
Between the emitter of switch S1 and the collector of controllable switch S2, the cathode of DC grid is connected to the emitter of controllable switch S3
Between the collector of controllable switch S4；The collector of one end connection controllable switch S1 of capacitor C1, the other end of capacitor C1 are logical
Cross the emitter of capacitor C2 connection controllable switch S4, the base stage of controllable switch S1, the base stage of controllable switch S2, controllable switch S3
Base stage and the base stage of controllable switch S4 are connect with from controller.
Further, the master controller includes communication module, cutting-in control module, SOC balance module, pwm signal life
At module and principal and subordinate's interactive module, the communication module, cutting-in control module, SOC balance module, pwm signal generation module and
Principal and subordinate's interactive module is sequentially connected, and is connect from controller with principal and subordinate's interactive module.
Compared with prior art, the beneficial effects of the present invention are
Multiple energy-storage modules are arranged in the present invention, can access two batteries respectively, and to battery independent control charge and discharge, keep away
Exempt from the direct series connection between battery, controls more flexible；Each energy-storage module uses exportable three level voltage of a controller, greatly
Cost is reduced greatly；Wiring simplifies, and only three cable connections is needed to arrive energy-storage module after the series connection of two batteries, and using two level blocks
25% can be reduced compared to number of cables, adapts to DC grid energy storage.
Detailed description of the invention
Fig. 1 is a kind of integral module structure chart of modularized dc energy-storage system of the invention；
Fig. 2 is three level energy-storage modules of the invention, battery unit and grid-connected reactor connection structure diagram；
Fig. 3 is the circuit structure diagram of three level energy-storage modules of the invention.
Specific embodiment
In the following, being described further in conjunction with attached drawing and specific embodiment to the present invention, it should be noted that not
Under the premise of conflicting, new implementation can be formed between various embodiments described below or between each technical characteristic in any combination
Example.
As depicted in figs. 1 and 2, the present invention provides a kind of modularized dc energy-storage systems comprising if master controller,
It does from controller, grid-connected reactor L, multiple three level energy-storage modules and several groups battery unit, is stored up from controller and three level
The quantity of energy module is identical.Battery unit and the quantity of three level energy-storage modules are also equal, and battery unit and three level store up
It can module one-to-one correspondence.Specifically, each group of battery unit includes two batteries, it is denoted as the first battery B1 and the in the present invention
Two battery B2, the first battery B1 and the second battery B2 are connected in series, and form series arm.Described in the anode connection of the series arm
The electrode input end X1 of three level energy-storage modules, the cathode that the cathode of the series arm connects the three level energy-storage module are defeated
Enter to hold X3.The neutral input end X2 of three level energy-storage modules is connected between the first battery B1 and the second battery B2.
The output end of three level energy-storage modules is sequentially connected in series, and the output end connection of the three level energy-storage module to rank the first
One end of the grid-connected reactor L, the grid-connected reactor L the other end connection outside DC grid anode, come end
The output end of the three level energy-storage module of tail connects the cathode of the DC grid.In fact, each three level energy storage
Module all has a cathode output end X4 and a cathode output end X5, and three level energy-storage modules are arranged successively, previous
The cathode output end X5 of three level energy-storage modules connects the cathode output end X4 of adjacent three level energy-storage module of the latter, successively
Analogize, the cathode output end X4 as first three level energy-storage module then connects grid-connected reactor, as the last one three
The cathode output end X5 of level energy-storage module then connects the cathode of DC grid.From controller and the three level energy-storage module one
One is correspondingly connected with, and described connect from controller with the master controller.
Specifically, master controller includes communication module, cutting-in control module, SOC balance module, pwm signal generation module
With principal and subordinate's interactive module, the communication module, the cutting-in control module, the SOC balance module, the pwm signal are generated
Module and principal and subordinate's interactive module are sequentially connected, described to connect from controller with principal and subordinate's interactive module.
Communication module receives the instruction of grid-connected and charge-discharge electric power, and cutting-in control module is according to network voltage, the electricity detected
Stream and charge-discharge electric power calculate output reference voltage uref using closed loop control algorithm, SOC (State of Charge,
State-of-charge is also remaining capacity) effect of balance module is to control all battery units using sequence or PI control scheduling algorithm
SOC balance, the effect of pwm signal generation module is to generate all three level using phase-shifting carrier wave PWM or carrier wave stacking PWM
The control signal of energy-storage module, the effect of principal and subordinate's interactive module are to send out the control signal of all three level energy-storage modules
It goes, while receiving from status feedback signals such as the voltages, electric current, temperature of controller.Each three level energy-storage module has one
From controller, effect is the switching signal for receiving master controller and sending, and controls the open-minded of each switch by driving circuit
Or shutdown, while detecting the status signals such as cell voltage, electric current, temperature and feeding back to master controller.
The specific structure is shown in FIG. 3 for three level energy-storage modules comprising capacitor C1, capacitor C2, controllable switch S1, controllable
Switch S2, controllable switch S3 and controllable switch S4, the emitter of the controllable switch S1 connect the current collection of the controllable switch S2
Pole, the emitter of the controllable switch S2 connect the collector of the controllable switch S3, and the emitter of the controllable switch S3 connects
The collector of the controllable switch S4 is connect, the collector of the controllable switch S1 connects the anode of the series arm, that is,
As the electrode input end X1 of three level energy-storage modules, the emitter of the controllable switch S4 connects the negative of the series arm
Pole, that is, negative input X3, the neutral input end X2 as three level energy-storage modules are located at the controllable switch S2
Emitter and the controllable switch S3 collector between, one end of the grid-connected reactor is connected to the controllable switch S1
Emitter and the controllable switch S2 collector between, the cathode of the DC grid is connected to the controllable switch S3's
Between emitter and the collector of the controllable switch S4；One end of the capacitor C1 connects the current collection of the controllable switch S1
Pole, the other end of the capacitor C1 connect the emitter of the controllable switch S4, the controllable switch S1 by the capacitor C2
Base stage, the base stage of the controllable switch S2, the base stage of the base stage of the controllable switch S3 and the controllable switch S4 and institute
It states and is connected from controller.
The working principle of three level energy-storage modules is that the control signal of controllable switch S1 and controllable switch S2 are complementary, controllably
The control signal of switch S3 and controllable switch S4 is complementary.Assuming that the voltage of the first battery and the second battery in one group of battery unit
Voltage is respectively U1 and U2, when controllable switch S1 and controllable switch S3 is connected, the access of the first battery, and output voltage Vo=U1,
When controllable switch S2 and controllable switch S4 is connected, the second battery is accessed, output voltage Vo=U2, controllable switch S2 and controllable switch
When S3 is connected, two batteries are not accessed, output voltage Vo=0, when controllable switch S1 and controllable switch S4 is connected, two electricity
It is accessed after the series connection of pond, output voltage Vo=U1+U2.Since U1 and U2 is close, output voltage is three level.
Controllable switch on each three level energy-storage module uses full-control type device for power switching, according to output voltage etc.
The difference of grade selects corresponding power semiconductor switch source electrode, such as IGBT or MOSFET.
The operation principle of the present invention is that: output reference voltage uref is obtained according to cutting-in control algorithm first, due to each
The output voltage of three level energy-storage modules can be 0, be also possible to a cell voltage or two cell voltages, in each control
Period can calculate according to the size of uref and cell voltage needs the access of how many battery.To make all batteries
The SOC (residual capacity) of unit is balanced, it is necessary to which voltage or SOC to all battery units are ranked up control, work as energy-storage system
When charging, so that voltage or the lower battery unit of SOC first access, when energy storage system discharges, so that voltage or SOC are higher
Battery unit first accesses.The each energy-storage module of the present invention can its charge and discharge of independent control and SOC, avoid a large amount of battery cells
Direct series connection, the battery of different size difference newness degree can be used, realize old and useless battery echelon utilize, and due to
Using three level energy-storage modules, module number greatly reduces, and cost is relatively low.
The above embodiment is only the preferred embodiment of the present invention, and the scope of protection of the present invention is not limited thereto,
The variation and replacement for any unsubstantiality that those skilled in the art is done on the basis of the present invention belong to institute of the present invention
Claimed range.
Claims (3)
1. a kind of modularized dc energy-storage system, which is characterized in that including master controller, it is several from controller, grid-connected reactor,
Multiple three level energy-storage modules and several groups battery unit, the three level energy-storage module and the battery unit correspond,
Battery unit described in each group includes being sequentially connected in series the first battery and the second battery to form series arm, the series arm
Anode connect the electrode input end of the three level energy-storage module, the cathode of the series arm connects the three level energy storage
The negative input of module, the neutral input end of the three level energy-storage module are connected to first battery and second electricity
Between pond；The output end of the three level energy-storage module is sequentially connected in series, and the three level energy-storage module to rank the first
Output end connect one end of the grid-connected reactor, the DC grid outside the other end connection of the grid-connected reactor is just
Pole, the output end for coming the three level energy-storage module at end connect the cathode of the DC grid；It is described from controller with
The three level energy-storage module connects one to one, and described connect from controller with the master controller.
2. modularized dc energy-storage system as described in claim 1, which is characterized in that the three level energy-storage module includes electricity
Hold C1, capacitor C2, controllable switch S1, controllable switch S2, controllable switch S3 and controllable switch S4, the transmitting of the controllable switch S1
Pole connects the collector of the controllable switch S2, and the emitter of the controllable switch S2 connects the current collection of the controllable switch S3
Pole, the emitter of the controllable switch S3 connect the collector of the controllable switch S4, and the collector of the controllable switch S1 connects
The anode of the series arm is connect, the emitter of the controllable switch S4 connects the cathode of the series arm, and the neutrality is defeated
Enter end between the emitter of the controllable switch S2 and the collector of the controllable switch S3, the one of the grid-connected reactor
End is connected between the emitter of the controllable switch S1 and the collector of the controllable switch S2, the cathode of the DC grid
It is connected between the emitter of the controllable switch S3 and the collector of the controllable switch S4；One end of the capacitor C1 connects
The collector of the controllable switch S1, the other end of the capacitor C1 connect the hair of the controllable switch S4 by the capacitor C2
Emitter-base bandgap grading, the base stage of the controllable switch S1, the base stage of the controllable switch S2, the base stage of the controllable switch S3 and described controllable
The base stage of switch S4 is connect with described from controller.
3. modularized dc energy-storage system as claimed in claim 2, which is characterized in that the master controller includes communication mould
Block, cutting-in control module, SOC balance module, pwm signal generation module and principal and subordinate's interactive module, the communication module, it is described simultaneously
Net control module, the SOC balance module, the pwm signal generation module and principal and subordinate's interactive module are sequentially connected, described
It is connect from controller with principal and subordinate's interactive module.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910476240.1A CN110266028A (en) | 2019-06-03 | 2019-06-03 | A kind of modularized dc energy-storage system |
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| CN201910476240.1A CN110266028A (en) | 2019-06-03 | 2019-06-03 | A kind of modularized dc energy-storage system |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934334A (en) * | 2020-07-08 | 2020-11-13 | 深圳供电局有限公司 | Energy storage control system and power system |
| CN114243840A (en) * | 2021-12-21 | 2022-03-25 | 青岛美凯麟科技股份有限公司 | Circuit for series connection of battery cell output combination and automatic bypass and equalization |
-
2019
- 2019-06-03 CN CN201910476240.1A patent/CN110266028A/en active Pending
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111934334A (en) * | 2020-07-08 | 2020-11-13 | 深圳供电局有限公司 | Energy storage control system and power system |
| CN114243840A (en) * | 2021-12-21 | 2022-03-25 | 青岛美凯麟科技股份有限公司 | Circuit for series connection of battery cell output combination and automatic bypass and equalization |
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