CN110265976A - A kind of the linkage protection circuit and battery energy storage system of battery energy storage system - Google Patents
A kind of the linkage protection circuit and battery energy storage system of battery energy storage system Download PDFInfo
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- CN110265976A CN110265976A CN201910537354.2A CN201910537354A CN110265976A CN 110265976 A CN110265976 A CN 110265976A CN 201910537354 A CN201910537354 A CN 201910537354A CN 110265976 A CN110265976 A CN 110265976A
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- Prior art keywords
- circuit
- energy storage
- storage system
- battery
- cmu
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/36—Arrangements for testing, measuring or monitoring the electrical condition of accumulators or electric batteries, e.g. capacity or state of charge [SoC]
- G01R31/382—Arrangements for monitoring battery or accumulator variables, e.g. SoC
- G01R31/3842—Arrangements for monitoring battery or accumulator variables, e.g. SoC combining voltage and current measurements
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
Abstract
The linkage protection circuit and battery energy storage system of battery energy storage system provided by the invention, applied to technical field of power systems, fault detection circuit is arranged in the circuit, emergency stop trigger signal is exported after detecting battery cluster failure to emergent stop signal generative circuit, emergent stop signal generative circuit is after receiving emergency stop trigger signal, the first emergent stop signal is exported to PCS, PCS stops output PWM modulation signal, and then reduce the DC current for flowing through the first dc switch being arranged in CMU, when the DC current meets the turn-off capacity of the first dc switch, the first dc switch that each CMU controls itself setting disconnects.The present invention is when detecting that any battery cluster breaks down, output PWM modulation signal is stopped by PCS first, the DC current for passing through the first dc switch being arranged in every CMU reduces, reduce the requirement to the first dc switch breaking capacity, avoid electrical adhesion in breaking course, it is ensured that the safe operation of battery energy storage system.
Description
Technical field
The present invention relates to technical field of power systems, in particular to the linkage protection circuit and electricity of a kind of battery energy storage system
Pond energy-storage system.
Background technique
It is a kind of structural schematic diagram of battery energy storage system in the prior art referring to Fig. 1, Fig. 1.It is provided in the prior art
In battery energy storage system, battery cluster 1-N is corresponding to be provided with CMU (Cluster Management Unit, battery cluster management list
Member), and the same BCP (Battery Collection Panel, battery confluence cabinet), warp are accessed with parallel way by CMU
After BCP direct current confluence, access PCS (Power Conversion System, energy storage inverter) carries out DC-AC conversion, most
It is connected to the grid eventually with alternating current form.It wherein, further include multiple battery moulds being made of preset quantity battery core in each battery cluster
Group.
CMU includes control panel, current sensor, voltage transformer, and the dc switch for breaking current.CMU is adopted
The operating parameters such as voltage, the electric current of set battery cluster, and gained operating parameter is uploaded to BMS in a manner of network communication
(Battery Manage System, system-level battery management unit), BMS is managed collectively multiple battery clusters, including battery cluster
Incision, cut out control, and the battery cluster operating parameter of extraction is uploaded into BCP in a manner of network communication simultaneously.
When some battery cluster must log off because of itself local fault, CMU needs the control information according to BMS, control
Dc switch processed disconnects, and fail battery cluster is cut out.This control mode requires the direct disjunction of dc switch in CMU specified
Operating current or even the bigger fault current of current value, it is more demanding to the breaking capacity of dc switch, it is easy because direct current is opened
The shortcoming for closing arc extinguishing ability generates electrical adhesion, can not in time cut out fail battery cluster, influence entire battery energy storage system
Safe operation.
Summary of the invention
The present invention provides the linkage protection circuit and battery energy storage system of a kind of battery energy storage system, to solve the prior art
It is middle possibly to cut out fail battery cluster in time, influence the problem of entire battery energy storage system is safely operated.
To achieve the above object, technical solution provided by the present application is as follows:
In a first aspect, the present invention provides a kind of linkage protection circuit of battery energy storage system, comprising: the inspection of at least one failure
Slowdown monitoring circuit and an emergent stop signal generative circuit, wherein
The input terminal of the fault detection circuit is connected with the battery cluster management unit CMU of the battery energy storage system, uses
In the operating parameter for acquiring the corresponding battery cluster of the CMU, and after determining the battery cluster failure according to the operating parameter
Emergency stop trigger signal is exported to the emergent stop signal generative circuit；
The emergent stop signal generative circuit is for exporting the first emergent stop signal extremely after receiving the emergency stop trigger signal
The PCS so that the PCS stops output PWM modulation signal, and makes the CMU meet institute in the DC current for flowing through itself
After the breaking capacity for stating the first dc switch being arranged in CMU, controls first dc switch and disconnect.
Optionally, circuit is protected in the linkage for the battery energy storage system that first aspect present invention provides, further includes: Time-delayed trigger
Mechanism, wherein
The Time-delayed trigger mechanism converges with the battery of the emergent stop signal generative circuit and the battery energy storage system respectively
It flows cabinet BCP to be connected, reaches preset duration threshold for starting timing after receiving first emergent stop signal, and in timing duration
After value, Xiang Suoshu BCP exports enable signal, so that the BCP controls the dc circuit breaker being arranged in the BCP and disconnects.
Optionally, the fault detection circuit includes voltage failure detection circuit and current failure detection circuit, wherein
The voltage failure detection circuit is used for after detecting the battery cluster electric voltage exception, exports the emergency stop triggering
Signal is to the emergent stop signal generative circuit；
The current sensor being arranged in the current failure detection circuit and the CMU is connected, for described in detect
CMU exports the emergency stop trigger signal to the emergent stop signal generative circuit after current failure occurs.
Optionally, the voltage failure detection circuit includes switch adhesion detection circuit, overcharges detection circuit, over-discharge detection
At least one of circuit, and, the first logic sum gate circuit, wherein
The switch adhesion detection circuit, it is described overcharge detection circuit, the input terminal of the over-discharge detection circuit is made respectively
For each input terminal of the voltage failure detection circuit；
The switch adhesion detection circuit, it is described overcharge detection circuit, the over-discharge detection circuit output end respectively with
Each input terminal of the first logic sum gate circuit is connected；
Output end and the urgency of the output end of the first logic sum gate circuit as the voltage failure detection circuit
Stop signal generating circuit to be connected.
Optionally, the first logic sum gate circuit also passes through the battery that another input terminal receives the CMU transmission
Mould group fault-signal.
Optionally, the emergent stop signal generative circuit includes: the second logic sum gate circuit, wherein
Each input terminal of second logic sum gate circuit output end one with each fault detection circuit respectively
One is corresponding connected.
Optionally, circuit is protected in the linkage for the battery energy storage system that first aspect present invention any of the above-described provides, described
Fault detection circuit is set in the CMU.
Optionally, circuit is protected in the linkage for the battery energy storage system that first aspect present invention any of the above-described provides, described
Emergent stop signal generative circuit is set in the system-level battery management unit SMU of the battery energy storage system.
Second aspect, the present invention provide a kind of battery energy storage system, comprising: N number of battery cluster, and in any battery cluster
It is wanted including M battery management unit BMU, N number of CMU, at least one BCP, at least one PCS, at least one SMU and right
The linkage of the described in any item battery energy storage systems of 1-8 is asked to protect circuit, wherein N is positive integer, and M is electricity in the battery cluster
The quantity of Chi Mo group；
The BMU in each battery cluster and the corresponding CMU communication connection；
The SMU respectively with each CMU and the BCP communication connection；
The both ends of each battery cluster are connected to the mutually different CMU；
The both ends of each CMU are connected through the BCP with the DC side of the PCS respectively, the exchange side of the PCS and electricity
Net is connected；
The PCS is used for after the first emergent stop signal for receiving the linkage protection circuit output, stops output PWM tune
Signal processed, to reduce the DC current for flowing through each CMU；
The CMU is used for after the breaking capacity that the DC current for flowing through itself meets first dc switch, control
First dc switch is made to disconnect.
Optionally, the PCS is also used to meet point of the second dc switch of therein in the DC current for flowing through itself
After cutting capacity, controls second dc switch and disconnect, wherein the specified breaking current of second dc switch is greater than described
The specified breaking current of first dc switch.
Optionally, the CMU is also used to the preset failure signal identification according to each BMU feedback and stores break down
Battery modules information.
Optionally, the SMU is also used to acquire the emergency stop trigger signal of each fault detection circuit, and according to the urgency
Stop the information that trigger signal identifys and stores the battery cluster to break down.
Optionally, the battery energy storage system that second aspect of the present invention any of the above-described provides, the BCP further includes manual urgency
Guard's valve, the manual emergency stop switch is for exporting the second emergent stop signal；
The PCS is also used to after receiving second emergent stop signal, stops output PWM modulation signal, to reduce stream
DC current through each CMU.
The linkage protection circuit and battery energy storage system of battery energy storage system provided by the invention, setting fault detection electricity
The detection to the operating parameter of each battery cluster is realized on road, and exports emergency stop trigger signal to urgency after detecting battery cluster failure
Stop signal generating circuit, emergent stop signal generative circuit exports the first emergent stop signal, PCS after receiving emergency stop trigger signal, to PCS
After receiving the first emergent stop signal, stop output PWM modulation signal, and then reduce the first dc switch for flowing through and being arranged in CMU
DC current, when the DC current meets the turn-off capacity of the first dc switch, it is first straight to control itself setting by each CMU
Stream switch disconnects.Linkage provided by the invention protection circuit and battery energy storage system are detecting that any battery cluster breaks down
When, output PWM modulation signal is stopped by PCS first, so that flowing through the straight of the first dc switch being arranged in every CMU
Galvanic electricity stream reduces, and reduces the requirement to the first dc switch breaking capacity, avoids generating electrical adhesion in breaking course, it is ensured that whole
The safe operation of a battery energy storage system.
Detailed description of the invention
Technical solution in order to illustrate the embodiments of the present invention more clearly or in the prior art to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, it is only this that interior attached drawing, which is described below,
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
It obtains other drawings based on these drawings.
Fig. 1 is a kind of structural schematic diagram of battery energy storage system in the prior art；
Fig. 2 is linkage protection circuit and the battery energy storage system for a kind of battery energy storage system that the present patent application embodiment provides
The structural block diagram of system connection；
Fig. 3 is the circuit structure that voltage failure detection circuit in circuit is protected in the linkage that the present patent application embodiment provides
Figure；
Fig. 4 is the circuit structure diagram that CMU exports battery modules fault-signal in the embodiment of the present invention；
Fig. 5 is the circuit structure that emergent stop signal generative circuit in circuit is protected in the linkage that the present patent application embodiment provides
Figure；
Fig. 6 is that the linkage that the present patent application embodiment provides protects emergent stop signal generative circuit in circuit to generate the first emergency stop
The logic schematic diagram of signal；
Fig. 7 is the linkage protection circuit and battery energy storage for another battery energy storage system that the present patent application embodiment provides
The structural block diagram of system connection；
Fig. 8 is a kind of battery energy storage system that the present patent application embodiment provides；
Fig. 9 is a kind of linkage protection control flow chart of battery energy storage system provided in an embodiment of the present invention.
Specific embodiment
Below in conjunction with the attached drawing in the embodiment of the present application, technical solutions in the embodiments of the present application carries out clear, complete
Site preparation description, it is clear that described embodiments are only a part of embodiments of the present application, instead of all the embodiments.It is based on
Embodiment in the application, it is obtained by those of ordinary skill in the art without making creative efforts every other
Embodiment shall fall in the protection scope of this application.
Referring to fig. 2, Fig. 2 is the linkage protection circuit and electricity for a kind of battery energy storage system that the present patent application embodiment provides
Circuit is protected in the linkage of the structural block diagram of pond energy-storage system connection, battery energy storage system provided in an embodiment of the present invention, comprising: extremely
A few fault detection circuit 10 and an emergent stop signal generative circuit 20, wherein
The input terminal of fault detection circuit 10 and battery energy storage system CMU30 (Cluster Management Unit,
Battery cluster management unit) it is connected, for acquiring the operating parameter of the corresponding battery cluster of CMU30, and according to gained operating parameter
Emergency stop trigger signal is exported to emergent stop signal generative circuit 20 after determining battery cluster failure.It is envisioned that working as battery energy storage
When multiple CMU30 being arranged in system, fault detection circuit 10 should be correspondingly arranged with CMU30, so that the operation shape of each CMU30
State can access effective detection, improve the safety of battery energy storage system.
Optionally, fault detection circuit 10 includes voltage failure detection circuit 101 and current failure detection circuit 102,
In, voltage failure detection circuit 101 acquires the voltage value of CMU30 predeterminated position, is detecting the battery cluster voltage being attached thereto
After exception, output emergency stop trigger signal to emergent stop signal generative circuit 20.It is arranged in current failure detection circuit 102 and CMU30
Current sensor be connected, acquisition current sensor feedback current value, and detect CMU30 occur current failure after export
Emergency stop trigger signal is to emergent stop signal generative circuit 20.
Specifically, Fig. 3 is that voltage failure detection in circuit is protected in the linkage that the present patent application embodiment provides referring to Fig. 3
The circuit structure diagram of circuit.The voltage failure detection circuit 101 that the present patent application embodiment provides includes switch adhesion detection electricity
Road at least one of overcharges detection circuit, over-discharge detection circuit, and, the first logic sum gate circuit.
It should be noted that specifically including switch adhesion detection circuit in voltage failure detection circuit 101, overcharging detection electricity
In road, over-discharge detection circuit any one or it is multiple, need the comprehensive tool for realization required by fault detection circuit 10
Detecting functions and equipment cost comprehensively consider, in example shown in Fig. 3, provide be voltage failure detection circuit 101 simultaneously
Including switch adhesion detection circuit, overcharge detection circuit and over-discharge detection circuit when, connection with the first logic sum gate circuit
Situation.
Specifically, switch adhesion detection circuit, overcharging the input terminal of detection circuit, over-discharge detection circuit respectively as voltage
Each input terminal of fault detection circuit 101, switch adhesion detection circuit, the output for overcharging detection circuit, over-discharge detection circuit
End is connected with each input terminal of the first logic sum gate circuit respectively.
Optionally, switch adhesion detection circuit includes comparator 1, comparator 2, comparator 3 and third logic sum gate electricity
Road.Third logic sum gate circuit is additionally provided with enable bit, which acquires the combined floodgate for the first dc switch being arranged in CMU30
Signal, and using the switching signal as the enable signal of third logic sum gate circuit.After collecting the enable signal, third logic
OR circuit just starts to work normally.Vdc1、Vdc2、Vdc3It is the voltage for the first dc switch predeterminated position being arranged in CMU30
Value, the connection of voltage failure detection circuit 101 and the first dc switch wouldn't go to live in the household of one's in-laws on getting married herein for details, reference can be made to shown in Fig. 8
It states.Switch adhesion detection circuit is compared by comparator 1, comparator 2 and comparator 3, works as Vdc1、Vdc2、Vdc3Three
When any two are equal in voltage value, the first dc switch adhesion is determined, respective comparator exports high level, defeated with each comparator
The connected third logic sum gate circuit output high level of outlet.
It overcharges detection circuit and over-discharge detection circuit acquires same voltage Vdc1, wherein it overcharges detection circuit and passes through comparator
4 overcharge reference voltage V with presetCComparison, works as Vdc1>VCWhen, comparator 4 exports high level.Over-discharge detection circuit is by comparing
Device 5 and over-discharge reference voltage VDComparison, works as Vdc1<VDWhen, comparator 5 exports high level.
Further, the first logic sum gate circuit also passes through CMU30 in another input terminal reception battery energy storage system
The battery modules fault-signal (being similarly high level) of transmission.
The output end of first logic sum gate circuit is generated as the output end and emergent stop signal of voltage failure detection circuit 101
Circuit 20 is connected, when any input terminal of the first logic sum gate circuit, alternatively, when multiple input terminals receive high level, first
First predetermined level value of the logic sum gate circuit output as emergency stop trigger signal.
Optionally, for the characterization battery modules of CMU30 output, there are the battery modules fault-signals of failure, reference can be made to figure
4, Fig. 4 be the circuit structure diagram that CMU exports battery modules fault-signal in the embodiment of the present invention.If shown, BMU (Battery
Management Unit, battery management unit) it is realized based on chip BQ79606 in the prior art, which can realize
For the detection of the failures such as the over-voltage of battery modules, under-voltage, excess temperature, low temperature.To realize effective detection to each battery modules, often
Each battery modules in one battery cluster can one BMU of corresponding setting, any battery modules occur it is aforementioned any one therefore
When barrier, is uploaded step by step by the realization of FULTLP, FULTLN pin, be finally transmitted to the BQ79606 chip being arranged in CMU, the core
Piece carries out information communication, the signal content that MCU is parsed, if any by the MCU being arranged in UART communication interface and CMU
BMU uploads the preset failure signal of characterization battery modules failure, and MCU will be finally to an input terminal of voltage failure detection circuit
Battery modules fault-signal is exported, i.e. the battery modules fault-signal for the MCU final output being arranged in CMU can characterize any electricity
The malfunction of Chi Mo group.For the implementation method detected based on BQ79606 to all kinds of failures of battery modules, can refer to existing
There is the related content of technology to realize that details are not described herein again.
Optionally, current failure detection circuit 102 equally can based on comparator realize, an input terminal of comparator with
The current sensor being arranged in CMU30 is connected, the current value of acquisition current sensor feedback；Another input terminal of comparator is pre-
If current reference value, is compared by the value of feedback and the predetermined current reference value of current sensor, whether judge battery cluster
Current failure occurs, and exports emergency stop trigger signal to emergent stop signal generative circuit after detecting that current failure occurs for CMU30
20。
As previously mentioned, the output end of voltage failure detection circuit 101 and current failure detection circuit 102 can be used as failure
The output end of detection circuit 10 is connected with each input terminal of emergent stop signal generative circuit 20, event especially in battery energy storage system
When barrier detection circuit 10 is provided with multiple, emergent stop signal generative circuit 20 needs to be arranged multiple input terminals, is used for corresponding acquisition
The emergency stop trigger signal of each output end of fault detection circuit 10 output.
It optionally, is that the linkage that the present patent application embodiment provides protects emergent stop signal in circuit to generate referring to Fig. 5, Fig. 5
The circuit structure diagram of circuit.Emergent stop signal generative circuit 20 includes the second logic sum gate circuit, as shown, the second logic sum gate
Each input terminal of circuit is connected with the output end of each fault detection circuit one-to-one correspondence respectively, and is receiving any failure
After the emergency stop trigger signal that detection circuit 10 is sent, the second predetermined level value as the first emergent stop signal is exported.
It is that the linkage that the present patent application embodiment provides protects emergent stop signal generative circuit in circuit to generate referring to Fig. 6, Fig. 6
The logic schematic diagram of first emergent stop signal, wherein CF1-CFNRespectively indicate the emergency stop triggering letter of corresponding fault detection circuit output
Number (in figure with a high level signal represent voltage failure detection circuit output emergency stop trigger signal and/or current failure detection
The emergency stop trigger signal of circuit output), when receiving the emergency stop trigger signal of any high level form, emergent stop signal generates electricity
Road exports the first emergent stop signal.
The output end of emergent stop signal generative circuit 20 and PCS (the Power Conversion of battery energy storage system
System, energy storage inverter) 50 be connected.Emergent stop signal generative circuit 20 is in the urgency for receiving any transmission of fault detection circuit 10
The first emergent stop signal is exported to PCS50 after stopping trigger signal.
PCS50 after receiving the first emergent stop signal, with its own protection power semiconductor signal (FA) with or
Logical relation complete block to pwm signal, that is, stop output PWM modulation signal, can be ensured after block and flow through the straight of CMU30
Galvanic electricity stream moment is to zero.
CMU30 after the breaking capacity that the DC current for flowing through itself meets the first dc switch being arranged in CMU30,
I.e. controllable first dc switch disconnects.Specifically, CMU30 can flow through first by the current sensor reading of itself setting
The current value of dc switch, when the current value is less than the first predetermined current threshold, i.e., controllable first dc switch disconnects.It can
It is contemplated that the first dc switch can specifically include but be not limited to dc circuit breaker, D.C. contactor, DC relay etc.
The switching device of division DC circuit can be achieved.
Further, the embodiment of the present invention also illustratively provides CMU30, BCP40, PCS50 in battery energy storage system, with
And the connection relationship between power grid 60, described as scheduled, CMU30 includes at least one, and packet in CMU30 in battery energy storage system
Multiple battery modules are included, CMU30 accesses the same BCP40 with parallel way, after BCP direct current confluence, accesses the direct current of PCS50
Side, and the exchange side of PCS50 is then connected with power grid 60, and no longer the connection of battery energy storage system is described in detail herein.
In conclusion circuit is protected in linkage provided by the invention, it is logical first when detecting that any battery cluster breaks down
It crosses PCS and stops output PWM modulation signal, so that the DC current for flowing through the first dc switch being arranged in every CMU subtracts
It is small, the requirement to the first dc switch breaking capacity is reduced, avoids generating electrical adhesion in breaking course, it is ensured that entire battery storage
The safe operation of energy system.
Further, in the prior art battery modules, battery cluster fault message be all based on Ethernet switch with net
What the mode of network communication was realized, corresponding dc switch, whole process are cut off from discovery battery modules or battery cluster failure to practical
Time-consuming be usually the second grade, and the present patent application embodiment provide linkage protect circuit, the transmitting of various types of signal is all logical
Hardware circuit realization is crossed, is generally Microsecond grade to the time-consuming that DC current is zero is reduced from corresponding failure is detected, and it is existing
Technology is compared, and the present patent application embodiment is remarkably improved the communication response time, so effectively improve battery energy storage system can
By property.
In view of PCS is there may be can not timely respond to or refuse to respond the first emergent stop signal, nothing is in turn resulted in
Timely the first dc switch of disjunction of method even causes failure further expansion, and the embodiment of the present invention also provides another linkage and protects
Protection circuit, referring to Fig. 7, Fig. 7 be the present patent application embodiment provide another battery energy storage system linkage protection circuit with
The structural block diagram of battery energy storage system connection, on the basis of embodiment shown in Fig. 2, the present embodiment further includes Time-delayed trigger mechanism
70, wherein
Time-delayed trigger mechanism 70 is connected with the BCP40 of emergent stop signal generative circuit 20 and battery energy storage system respectively, specifically
, the output end of the input terminal emergent stop signal generative circuit 20 of Time-delayed trigger mechanism 70 is connected, the output of Time-delayed trigger mechanism 70
It holds and is connected with the default enabled pin of BCP40.First emergent stop signal of emergent stop signal generative circuit 20 can be sent to delay simultaneously
The default pin of trigger mechanism 70 and PCS50, Time-delayed trigger mechanism 70 start timing after receiving the first emergent stop signal, and
After timing duration reaches preset duration threshold value, enable signal is exported to BCP40, so that BCP40 controls the straight of itself interior setting
Breaker is flowed to disconnect.
Optionally, Time-delayed trigger mechanism 70 can be selected time-delay relay in the prior art and realize.
Circuit is protected in the linkage that application embodiment provides through the invention, and BCP and PCS, which can cooperate, realizes dual guarantor
Barrier, if the output that PCS can not block PWM modulation signal for some reason still may be used after Time-delayed trigger mechanism 70 reaches timing duration
To disconnect DC loop by BCP, since the arc-chutes for the dc circuit breaker being arranged in BCP are larger, electric current breaking capacity ratio CMU
Therefore the electric current strong breaking capacity of the first interior dc switch still can achieve effective disjunction DC current, prevent in CMU
The purpose that sticks together of the first dc switch, further increase the reliability of battery energy storage system.
It should be noted that, when PCS stopping output PWM modulation signal, flowing through each CMU's for aforementioned any embodiment
After DC current meets the turn-off capacity for the first dc switch being arranged in CMU, the simultaneously turned off inside each MCU can choose
One dc switch can also only switch off the first dc switch in the MCU to break down.For the first direct current specifically turned off
The selection and control of switch can realize that the present patent application does not limit this by adjusting the control logic of MCU in the prior art
It is fixed.
It optionally, is the composition for simplifying battery energy storage system, it, can be by fault detection convenient for the management to each composition part
Circuit is set in CMU.Correspondingly, emergent stop signal generative circuit is set in SMU.It is of course also possible to by linkage protection electricity
Road is set among other composition parts of battery energy storage system, under the premise of without departing from core concept of the present invention, equally all
Belong to the range of the present patent application protection.
The battery energy storage system of the present patent application is introduced below.It is the present patent application embodiment referring to Fig. 8, Fig. 8
A kind of battery energy storage system provided.The battery energy storage system that the present patent application embodiment provides, comprising:
N number of battery cluster (CMU for illustratively providing 1 battery cluster in Fig. 8 and being correspondingly arranged with the battery cluster), and appoint
It include M BMU, N number of CMU, at least one BCP, at least one PCS, at least one SMU and above-mentioned implementation in one battery cluster
Circuit is protected in linkage described in any one of example, wherein N is positive integer, and M is the quantity of battery modules in the battery cluster.
Specifically, BMU in each battery cluster and corresponding CMU communication connection, SMU connect with each CMU and BCP communication respectively
It connects.The both ends of each battery cluster are connected to mutually different CMU, and the both ends of each CMU are connected through BCP with the DC side of PCS respectively,
The exchange side of the PCS is connected with power grid.
PCS is used for after the first emergent stop signal for receiving linkage protection circuit output, stops output PWM modulation signal,
To reduce the DC current for flowing through each CMU, CMU is used to meet the disjunction of the first dc switch in the DC current for flowing through itself
After ability, the first dc switch of control is disconnected.
The battery energy storage system that application embodiment provides through the invention, when detecting that any battery cluster breaks down,
Output PWM modulation signal is stopped by PCS first, so that flowing through the direct current for the first dc switch being arranged in every CMU
Electric current reduces, and reduces the requirement to the first dc switch breaking capacity, avoids generating electrical adhesion in breaking course, it is ensured that entire
The safe operation of battery energy storage system.
Further, circuit is protected in the linkage that the present patent application embodiment provides, and the transmitting of various types of signal is all by hard
What part circuit was realized, it is generally Microsecond grade to the time-consuming that DC current is zero is reduced from corresponding failure is detected, with the prior art
It compares, the present patent application embodiment is remarkably improved the communication response time, and then effectively improves the reliability of battery energy storage system.
Optionally, PCS is also used to meet the disjunction energy of the second dc switch of therein in the DC current for flowing through itself
After power, the second dc switch of control is disconnected.It is envisioned that since PCS converges to the DC current for flowing through each CMU,
Therefore, the specified breaking current for the second dc switch being arranged in PCS is greater than the specified breaking current of the first dc switch.
PCS controller reads the current value for flowing through the second dc switch, when the current value is less than the second predetermined current threshold, i.e., controllably
Make the disconnection of the second dc switch, wherein the second predetermined current threshold is greater than aforementioned first predetermined current threshold.
Optionally, CMU can also acquire each BMU in same battery cluster and pass through the preset failure signal uploaded step by step, go forward side by side one
The information for the battery modules that step breaks down according to preset failure signal identification and storage.
Optionally, while emergent stop signal generative circuit receives the emergency stop trigger signal that each CMU is uploaded, SMU can also lead to
The emergency stop trigger signal of default each fault detection circuit of pin synchronous acquisition is crossed, and hair is identified and stored according to emergency stop trigger signal
The information of the battery cluster of raw failure.Identification for more circuit signal sources, can be real using identification method in the prior art
Existing, the present patent application does not limit this.
Optionally, BCP further includes manual emergency stop switch, when being in an emergency, is needed artificially to battery energy storage system
When working condition is intervened, it can be realized by triggering manual emergency stop switch, manual emergency stop switch is for exporting the second emergency stop
Signal stops output PWM modulation signal, is flowed through respectively with reducing correspondingly, PCS is also used to after receiving the second emergent stop signal
The DC current of a CMU.
It should be noted that similar with emergent stop signal generative circuit, PCS is receiving the first emergent stop signal or the second emergency stop
After signal, the operation for stopping output PWM modulation signal can be all executed, it is ensured that the safe operation of battery energy storage system.
It should also be noted that, BCP passes through the enabled of the default pin reception delay trigger mechanism of built-in BCP controller
Signal；PCS is to receive the first emergent stop signal and the second emergent stop signal by the default pin of built-in PCS controller, enables letter
Number, the transmitting of the first emergent stop signal, the second emergent stop signal is still and realized by hardware circuit.
The linkage protection control flow based on battery energy storage system shown in Fig. 8 is introduced below.Optionally, referring to figure
9, Fig. 9 be a kind of linkage protection control flow chart of battery energy storage system provided in an embodiment of the present invention, which includes:
Step S100, CMU internal fault detection circuit exports emergency stop trigger signal.
In battery energy storage system operational process, the fault detection circuit being arranged in CMU carries out battery cluster operating parameter
Detection determines that battery cluster breaks down according to gained operating parameter, then generates emergency stop trigger signal.Further, in battery cluster
Each battery modules are provided with BMU correspondingly, and when any battery mould group breaks down, each BMU in battery cluster will be with step by step
The form of upload finally feeds back battery modules fault-signal to fault detection circuit, which can equally make event
Hinder detection circuit and exports emergency stop trigger signal.
Step S110, emergent stop signal generative circuit send the first emergent stop signal.
After fault detection circuit sends emergency stop trigger signal to emergent stop signal generative circuit, emergent stop signal generative circuit hair
Send the first emergent stop signal to PCS and BCP.
Step S120, PCS stop output PWM and debug signal.
After the default pin for the PCS controller being arranged in PCS receives the first emergent stop signal, power is protected with its own
The signal (FA) of semiconductor devices with or logical relation complete block to pwm signal, that is, stop output PWM modulation signal,
And then reduce the DC current for flowing through each CMU.
Step S130, Time-delayed trigger mechanism judge whether timing duration reaches preset duration threshold value, if so, executing step
S140。
What the first emergent stop signal can synchronize is sent to Time-delayed trigger mechanism, so that Time-delayed trigger mechanism starts timing, works as meter
When constantly length reaches preset duration threshold value, the default pin for the BCP controller that Time-delayed trigger mechanism is arranged into BCP sends enabled
Signal.
When timing duration is not up to preset duration threshold value, Time-delayed trigger mechanism is failure to actuate.
Step S140, BCP control the disconnection of itself dc circuit breaker.
After the enable signal that BCP controller receives the transmission of Time-delayed trigger mechanism, i.e., the direct current being arranged in controllable BCP is disconnected
Road device disconnects, and disjunction flows through the DC current of BCP.
Step S150, CMU control the disconnection of the first dc switch.
After PCS stops output PWM debugging signal or BCP controls the disconnection of itself dc circuit breaker, CMU reads current sense
The current value of device feedback determines that the DC current for flowing through the first dc switch of its own setting meets the first direct current and opens in CMU
After the breaking capacity of pass, the first dc switch of control is disconnected.
It should be noted that in conjunction with introduction and control shown in Fig. 9 to linkage protection circuit, battery energy storage system
It is found that after step S110 emergent stop signal generative circuit sends the first emergent stop signal, step S120 and step S130 are process
Synchronous progress.For ease of description, the executive condition of illustrative step S120 first in above-described embodiment, then illustrative step S130
Executive condition, but be not the limitation to the two execution sequence.
It should be noted control flow shown in Fig. 9, the merely illustrative electricity provided using linkage protection circuit
The main linkage control process of pond energy-storage system can refer to aforementioned linkage protection electricity for the content that do not address in control flow
The related content of road and battery energy storage system, details are not described herein again.
Each embodiment is described in a progressive manner in the present invention, the highlights of each of the examples are with other realities
The difference of example is applied, the same or similar parts in each embodiment may refer to each other.For device disclosed in embodiment
Speech, since it is corresponded to the methods disclosed in the examples, so being described relatively simple, related place is referring to method part illustration
?.
The above described is only a preferred embodiment of the present invention, being not intended to limit the present invention in any form.Though
So the present invention has been disclosed as a preferred embodiment, and however, it is not intended to limit the invention.It is any to be familiar with those skilled in the art
Member, without departing from the scope of the technical proposal of the invention, all using the methods and technical content of the disclosure above to the present invention
Technical solution makes many possible changes and modifications or equivalent example modified to equivalent change.Therefore, it is all without departing from
The content of technical solution of the present invention, according to the technical essence of the invention any simple modification made to the above embodiment, equivalent
Variation and modification, all of which are still within the scope of protection of the technical scheme of the invention.
Claims (13)
1. circuit is protected in a kind of linkage of battery energy storage system characterized by comprising at least one fault detection circuit and one
A emergent stop signal generative circuit, wherein
The input terminal of the fault detection circuit is connected with the battery cluster management unit CMU of the battery energy storage system, for adopting
Collect the operating parameter of the corresponding battery cluster of the CMU, and is exported after determining the battery cluster failure according to the operating parameter
Emergency stop trigger signal is to the emergent stop signal generative circuit；
The emergent stop signal generative circuit after receiving the emergency stop trigger signal for exporting the first emergent stop signal to described
PCS so that the PCS stops output PWM modulation signal, and makes the CMU meet the CMU in the DC current for flowing through itself
After the breaking capacity of first dc switch of interior setting, controls first dc switch and disconnect.
2. circuit is protected in the linkage of battery energy storage system according to claim 1, which is characterized in that further include: delay touching
Send out mechanism, wherein
The Time-delayed trigger mechanism respectively with the battery of the emergent stop signal generative circuit and the battery energy storage system converge cabinet
BCP is connected, and reaches preset duration threshold value for starting timing after receiving first emergent stop signal, and in timing duration
Afterwards, Xiang Suoshu BCP exports enable signal, so that the BCP controls the dc circuit breaker being arranged in the BCP and disconnects.
3. circuit is protected in the linkage of battery energy storage system according to claim 1, which is characterized in that the fault detection electricity
Road includes voltage failure detection circuit and current failure detection circuit, wherein
The voltage failure detection circuit is used for after detecting the battery cluster electric voltage exception, exports the emergency stop trigger signal
To the emergent stop signal generative circuit；
The current failure detection circuit is connected with the current sensor being arranged in the CMU, for detecting the CMU hair
The emergency stop trigger signal is exported to the emergent stop signal generative circuit after raw current failure.
4. circuit is protected in the linkage of battery energy storage system according to claim 3, which is characterized in that the voltage failure inspection
Slowdown monitoring circuit includes switch adhesion detection circuit, at least one of overcharges detection circuit, over-discharge detection circuit, and, first patrols
Collect OR circuit, wherein
The switch adhesion detection circuit, the input terminal for overcharging detection circuit, the over-discharge detection circuit are respectively as institute
State each input terminal of voltage failure detection circuit；
The switch adhesion detection circuit, it is described overcharge detection circuit, the over-discharge detection circuit output end respectively with it is described
Each input terminal of first logic sum gate circuit is connected；
The output end of the first logic sum gate circuit is believed as the output end of the voltage failure detection circuit and the emergency stop
Number generative circuit is connected.
5. circuit is protected in the linkage of battery energy storage system according to claim 4, which is characterized in that first logic or
Gate circuit also passes through another input terminal and receives the battery modules fault-signal that the CMU is sent.
6. circuit is protected in the linkage of battery energy storage system according to claim 1, which is characterized in that the emergent stop signal is raw
It include: the second logic sum gate circuit at circuit, wherein
Each input terminal of the second logic sum gate circuit is a pair of with the output end of each fault detection circuit one respectively
It should be connected.
7. circuit is protected in the linkage of battery energy storage system according to claim 1-6, which is characterized in that the event
Barrier detection circuit is set in the CMU.
8. circuit is protected in the linkage of battery energy storage system according to claim 1-6, which is characterized in that the urgency
Stop signal generating circuit to be set in the system-level battery management unit SMU of the battery energy storage system.
9. a kind of battery energy storage system characterized by comprising N number of battery cluster, and include M electricity in any battery cluster
Pond administrative unit BMU, N number of CMU, at least one BCP, at least one PCS, at least one SMU and claim 1-8 are any
Circuit is protected in the linkage of battery energy storage system described in, wherein N is positive integer, and M is the number of battery modules in the battery cluster
Amount；
The BMU in each battery cluster and the corresponding CMU communication connection；
The SMU respectively with each CMU and the BCP communication connection；
The both ends of each battery cluster are connected to the mutually different CMU；
The both ends of each CMU are connected through the BCP with the DC side of the PCS respectively, exchange side and the power grid phase of the PCS
Even；
The PCS is used for after the first emergent stop signal for receiving the linkage protection circuit output, stops output PWM modulation letter
Number, to reduce the DC current for flowing through each CMU；
The CMU is used for after the breaking capacity that the DC current for flowing through itself meets first dc switch, controls institute
State the disconnection of the first dc switch.
10. battery energy storage system according to claim 9, which is characterized in that the PCS is also used to flowing through the straight of itself
After galvanic electricity stream meets the breaking capacity of the second dc switch of therein, controls second dc switch and disconnect, wherein is described
The specified breaking current of second dc switch is greater than the specified breaking current of first dc switch.
11. battery energy storage system according to claim 9, which is characterized in that the CMU is also used to according to each BMU
The preset failure signal identification of feedback and the information for storing the battery modules to break down.
12. battery energy storage system according to claim 9, which is characterized in that the SMU is also used to acquire each failure
The emergency stop trigger signal of detection circuit, and identify and store according to the emergency stop trigger signal letter of the battery cluster to break down
Breath.
13. according to the described in any item battery energy storage systems of claim 9-11, which is characterized in that the BCP further includes manual
Emergency stop switch, the manual emergency stop switch is for exporting the second emergent stop signal；
The PCS is also used to after receiving second emergent stop signal, is stopped output PWM modulation signal, is flowed through respectively with reducing
The DC current of a CMU.
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