CN111276989B - Energy storage control protection method and system - Google Patents

Energy storage control protection method and system Download PDF

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Publication number
CN111276989B
CN111276989B CN202010120580.3A CN202010120580A CN111276989B CN 111276989 B CN111276989 B CN 111276989B CN 202010120580 A CN202010120580 A CN 202010120580A CN 111276989 B CN111276989 B CN 111276989B
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Prior art keywords
battery
energy storage
battery cluster
switch
cluster
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CN111276989A (en
Inventor
刘万锦
郭鹏亮
石桥
王赛冲
张树宏
史尤杰
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China South Power Grid International Co ltd
Shenzhen Clou Electronics Co Ltd
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China South Power Grid International Co ltd
Shenzhen Clou Electronics Co Ltd
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    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02JCIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
    • H02J3/00Circuit arrangements for ac mains or ac distribution networks
    • H02J3/28Arrangements for balancing of the load in a network by storage of energy
    • H02J3/32Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • HELECTRICITY
    • H02GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02HEMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
    • H02H7/00Emergency 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
    • H02H7/18Emergency 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
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries

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  • Engineering & Computer Science (AREA)
  • Power Engineering (AREA)
  • Charge And Discharge Circuits For Batteries Or The Like (AREA)
  • Secondary Cells (AREA)

Abstract

The invention discloses an energy storage control protection method, which comprises the following steps: the BCMS receives a closing instruction of a battery cluster switch and judges whether the battery cluster switch is closed or not; after the BCMS judges that the battery cluster switch is closed, the EMS judges whether the battery cluster switch can be started to operate; when the EMS judges that the power-on operation can be performed, whether the energy storage system operates normally or not is judged. Meanwhile, the invention also discloses an energy storage control protection system. The invention can monitor, control and protect each battery cluster, thereby improving the utilization rate of the whole energy storage system and reducing the economic cost.

Description

Energy storage control protection method and system
Technical Field
The invention relates to the technical field of battery energy storage, in particular to an energy storage control protection method and system.
Background
The energy storage system is mainly used for analyzing an energy storage process and comprises energy and substance input and output, energy conversion and storage equipment. Energy storage systems often involve multiple energies, multiple devices, multiple substances, multiple processes, are complex energy systems that change over time, and require multiple indicators to describe their performance.
Along with the improvement of the living standard of people, the electricity consumption is larger and larger, and the requirements on energy storage control protection are higher and higher in order to lighten a certain heavy load time period of a power grid and reduce input cost.
At present, the service life of a battery is often shortened in the energy storage control protection process, and due to the fact that the current of each battery cluster is different, some battery clusters cannot be discharged or charged, so that the utilization rate of some battery clusters is low, the energy storage effect is poor, economic benefit is low, some battery clusters are easy to damage, the batteries are frequently replaced, economic loss is caused, and the utilization rate of an energy storage power station cannot be guaranteed.
Disclosure of Invention
The present invention aims to solve at least one of the technical problems existing in the prior art. Therefore, the invention provides the control method of the energy storage system, which can monitor, control and protect each battery cluster, thereby improving the utilization rate of the whole energy storage system and reducing the economic cost.
The invention also provides a system control system.
In a first aspect, an embodiment of the present invention provides an energy storage control protection method, including:
the BCMS receives a closing instruction of a battery cluster switch and judges whether the battery cluster switch is closed or not;
after the BCMS judges that the battery cluster switch is closed, the EMS judges whether the battery cluster switch can be started to operate;
when the EMS judges that the power-on operation can be performed, judging whether the energy storage system operates normally or not
The energy storage control protection method of the embodiment of the invention has at least the following beneficial effects: each battery cluster can be monitored, controlled and protected, so that the utilization rate of the whole energy storage system is improved, and the economic cost is reduced.
According to another embodiment of the present invention, the method for protecting energy storage control, determining whether a battery cluster switch is closed specifically includes the following steps:
the BCMS judges whether the battery parameters of the battery pack are normal or not;
judging whether the voltage difference value between the battery clusters is smaller than a set value of the voltage difference value between the battery clusters, and judging whether the temperature difference value between the battery clusters is smaller than the set value of the temperature difference value between the battery clusters;
the BCMS judges whether the insulation resistance between the battery cluster and the ground is normal or not;
BAMS judges whether the first-stage control protection switch and the second-stage control protection switch are on line;
when all the steps are judged to be yes, the battery cluster switch is closed;
the battery cluster includes at least one battery pack.
According to another embodiment of the present invention, the method for protecting energy storage control, the EMS determines whether the power-on operation is possible, specifically includes the following steps:
PCS judges whether the voltage values of alternating current and direct current are normal or not;
EMS sends a start-up instruction to the BAMS and the PCS;
the EMS reads the state information of the PCS and the BAMS respectively;
and the EMS judges whether the energy storage system can be started to operate or not according to the state information.
According to another embodiment of the present invention, when the PCS determines that the ac and dc voltage values are abnormal, the following steps are performed:
the PCS direct-current side switch is disconnected, the BAMS monitors the direct-current switch state and records first fault information of the switch state;
the PCS transmits the first fault information to the BAMS and uploads the first fault information to the EMS;
and when the EMS judges that the energy storage system cannot be started to operate, the EMS alarms and then executes the steps.
According to another embodiment of the present invention, the method for protecting energy storage control, determining whether the energy storage system is operating normally specifically includes the following steps:
the BCMS and the battery cluster direct current monitoring unit monitor whether the battery parameters of the branch of each battery cluster are normal or not;
BAMS monitors whether the battery parameters of the main circuit of the battery cluster are normal;
PCS monitors whether the current and the voltage of a main circuit of the battery cluster are normal or not;
and if yes, judging that the energy storage system is in normal operation.
According to further embodiments of the present invention a method of controlling an energy storage system,
when the BCMS and the battery cluster direct current monitoring unit monitor that the battery parameters of the branches of each battery cluster are abnormal, the following steps are executed:
the battery cluster switch is turned off, and the BCMS monitors the switch state of the battery cluster and records second fault information of the switch state;
the BCMS sends the second fault information to the BAMS;
the main circuit main switch of the battery cluster is disconnected, the BAMS monitors the state of the main switch and records the third fault information of the state of the switch;
the PCS direct-current side switch is disconnected, the BAMS monitors the direct-current switch state and records the first fault information of the switch state;
the BAMS transmits the first fault information, the second fault information, and the third fault information to the EMS.
In a second aspect, one embodiment of the invention provides an energy storage control protection system, which comprises a primary control protection device and a secondary control protection device, wherein the primary control protection device comprises a BMU, a BCMS, a first battery cluster direct current monitoring unit and a first control switch; the secondary control protection device comprises BAMS, EMS, a second battery cluster direct current monitoring unit, PCS and a second control switch, and the primary control protection device is controlled by the secondary control protection device.
The energy storage control protection system provided by the embodiment of the invention has at least the following beneficial effects: the intelligent control system can provide hardware support for energy storage system control, intelligent control of the energy storage system is realized, the service life of the energy storage system is prolonged, and the economic cost is reduced.
According to further embodiments of the present invention, the first control switch comprises a service switch MSD and a contactor, and the second control switch comprises a circuit breaker.
According to other embodiments of the present invention, an energy storage control system further includes a PACK, in which the BMU is disposed, and the BMU is configured to monitor data of the PACK and upload the data to the BCMS.
According to further embodiments of the present invention, an energy storage control system further includes an isolation transformer, an input terminal of the isolation transformer is connected to the power grid, and an output terminal of the isolation transformer is connected to the first control switch.
Drawings
FIG. 1 is a flow chart of an embodiment of a method for protecting energy storage control according to the present invention;
FIG. 2 is a flowchart of step S100 in FIG. 1;
FIG. 3 is a flowchart illustrating the step S200 in FIG. 1;
FIG. 4 is a flowchart illustrating the step S300 in FIG. 1;
fig. 5 is a schematic system architecture diagram of an embodiment of an energy storage control protection system according to the present invention.
Detailed Description
EMS: an energy storage management system;
BMU: a battery management unit;
PCS: an energy storage converter;
PACK: a battery pack formed by connecting batteries in series and parallel;
DMU: a direct current detection unit;
BCMS: a battery cluster management unit;
BAMS: a stack management system;
MSD: an overhaul switch;
SOC: i.e., state of charge, to reflect the remaining capacity of the battery.
The conception and the technical effects produced by the present invention will be clearly and completely described in conjunction with the embodiments below to fully understand the objects, features and effects of the present invention. It is apparent that the described embodiments are only some embodiments of the present invention, but not all embodiments, and that other embodiments obtained by those skilled in the art without inventive effort are within the scope of the present invention based on the embodiments of the present invention.
In the description of the present invention, if an orientation description such as "upper", "lower", "front", "rear", "left", "right", etc. is referred to, it is merely for convenience of description and simplification of the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the invention. If a feature is referred to as being "disposed," "secured," "connected," or "mounted" on another feature, it can be directly disposed, secured, or connected to the other feature or be indirectly disposed, secured, connected, or mounted on the other feature.
In the description of the embodiments of the present invention, if "several" is referred to, it means more than one, if "multiple" is referred to, it is understood that the number is not included if "greater than", "less than", "exceeding", and it is understood that the number is included if "above", "below", "within" is referred to. If reference is made to "first", "second" it is to be understood as being used for distinguishing technical features and not as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In one embodiment of the present invention, referring to fig. 5, a schematic system architecture diagram of a specific embodiment of an energy storage control protection system is shown. The device comprises a primary control protection device and a secondary control protection device, wherein the primary control protection device comprises a BMU7, a BCMS3, a first battery cluster direct current monitoring unit DMU4 and a first control switch; the secondary control protection device comprises BAMS2, EMS1, a second battery cluster direct current monitoring unit DMU5, PCS11 and a second control switch, and the primary control protection device is behind the secondary control protection device and is controlled by the secondary control protection device.
Wherein the first control switch comprises a service switch MSD8 and a contactor 9, wherein the second control switch comprises a circuit breaker 10.
Specifically, the overhaul switch MSD8 is provided with a fuse, and a mode of overhaul switch MSD8+ fuse is formed, so that overhaul and transportation are safer, short-circuit breaking time is shorter, and protection is more effective.
It can be understood that when a short circuit occurs, the internal resistance of each battery cluster is generally in milliohm level, the open circuit voltage of the battery cluster is generally above 600V, the short circuit current is generally above 6kA, when the internal resistance is increased, the short circuit current is smaller, and because the battery core inside the battery adopts the processes such as laser welding and the like, the copper sheet or the aluminum sheet is generally very thin and is very sensitive to the short circuit current, the longer the breaking time is, the larger the damage to the battery is, the shorter the breaking time is, the battery protection function is realized, so that the overlong protection time of the circuit breaker is not necessarily realized when the short circuit really occurs due to the difference of the internal resistances of the batteries of each cluster; it is necessary to isolate the obvious open contacts.
In the embodiment, after the maintenance switch MSD8 is combined with the fuse, battery cluster voltage cracking, electrical isolation and short-circuit protection are performed, so that maintenance and transportation are safer, the short-circuit protection breaking time is faster, and therefore, electrical components on a battery cluster circuit are effectively protected.
The energy storage control protection system in this embodiment further includes a PACK6, where a BMU7 is disposed in the PACK6, and the BMU7 is configured to monitor the data of the PACK6 and upload the data to the BCMS 3.
The purpose of this design in this embodiment is that it can be balanced according to the SOC of the battery, guaranteeing the uniformity in the battery cluster to guaranteed PACK 6's energy storage energy uniformity.
It can be understood that the control protection system in this embodiment can avoid the blind charging and blind discharging states, effectively charge and discharge the battery, and prolong the service life of the PACK 6.
The energy storage control protection system in this embodiment further includes an isolation transformer 12, an input end of the isolation transformer 12 is connected to the power grid, and an output end of the isolation transformer is connected to the first control switch.
Specifically, the system in this embodiment includes a plurality of battery PACKs PACK6 formed by connecting a plurality of batteries in series or in parallel, a plurality of battery PACKs PACK6 are connected in series to form a battery cluster, a BMU7 is provided in each PACK for managing each battery PACK6, a first control switch is provided in each battery cluster branch, and each battery cluster branch is connected in series with a DMU4 for dc detection of the battery cluster, a BCMS3 is provided in each battery cluster branch, each BCMS3 controls one or more BMUs 7, and BCMS3 also controls DMU4 of each battery cluster branch, and BAMS2 controls BCMS3 in each battery cluster branch, and BAMS2 also controls DMU5 on the battery cluster main and PCS11 on the battery cluster main, and uploads the above information collected by BAMS2 to 1.
More specifically, a battery cluster management unit BCMS3 is added to collect, analyze and report the DMU4 and BMU7 data of the battery clusters, and receive a control instruction of a superior battery stack management system BAMS2, and the BCMS3 can perform charge and discharge on the battery clusters, effectively protect each cluster of batteries from short circuit, overload, over-voltage and under-voltage and over-under-temperature, and ensure that the batteries run in a safe voltage and current range.
In another embodiment of the present invention, referring to fig. 1, a schematic flow chart of a specific embodiment of a method for protecting energy storage control in an embodiment of the present invention is shown, which specifically includes the steps of:
s100: the BCMS3 receives a closing instruction of the battery cluster switch and judges whether the battery cluster switch is closed or not;
specifically, after the BCMS3 determines that the battery cluster switch is closed, the PCS11 dc side and ac side switches are closed, so as to make a foundation for determining whether to start up for operation in the next step. If the battery cluster switch is judged to be in an open state at this time, the battery cluster switch needs to be closed, and meanwhile, the switch on the battery cluster main circuit needs to be closed.
S200: after the BCMS3 judges that the battery cluster switch is closed, the EMS1 judges whether the battery cluster switch can be started to operate;
it can be understood that only when the energy storage system is started to operate, the control protection method can be enabled to work, so that the energy storage control protection method has the advantages of improving the utilization rate of the energy storage system and reducing the economic cost.
S300: when the EMS judges that the power-on operation can be performed, whether the energy storage system operates normally or not is judged.
Referring to fig. 2, a schematic flow chart of a specific embodiment of a step S100 of an energy storage control protection method in an embodiment of the present invention is shown, specifically including the following steps:
s110: BCMS3 determines whether the battery parameters of the battery pack are normal;
specifically, the above battery parameters include, but are not limited to, battery voltage, battery temperature, and battery SOC value.
S120: judging whether the voltage difference between the battery clusters is smaller than the set value of the voltage difference between the battery clusters or not, and judging whether the temperature difference between the battery clusters is smaller than the set value of the temperature difference between the battery clusters or not;
specifically, in this embodiment, the voltage difference between the battery clusters is set to 5V, the temperature difference is set to 10 degrees celsius, when the voltage difference between the battery clusters is less than 5V or the temperature difference is less than 10 degrees celsius, the following step S130 is performed, and when the voltage difference between the battery clusters is greater than or equal to 5V or the temperature difference is greater than or equal to 10 degrees celsius, a forced switch closing operation needs to be performed, where the switches include a switch on a branch of the battery cluster and a switch on a main of the battery cluster.
S130: BCMS3 determines whether the insulation resistance between the battery cluster and the ground is normal;
specifically, insulation detection between each battery cluster and the ground is designed in the embodiment, and fault points are easier to locate.
The method for judging whether the insulation resistor is normal or not specifically includes the steps that a set value refers to a maximum bearing current I=30mA of a human body, the lowest protection value of a protection resistor of the insulation resistor is R ' =U/I, wherein U is energy storage system voltage, I is the maximum bearing current of the human body, R ' is the lowest value of the protection resistor, R is the set value of the insulation resistor, and the requirement of meeting the condition is R & gtR '.
S140: BAMS2 judges whether the first-stage control protection switch and the second-stage control protection switch are on line;
specifically, the first-stage control protection switch comprises an overhaul switch MSD8 and a contactor 9, the second-stage control protection switch comprises a breaker 10, and any device with a switching function can be adopted by the above switches.
When all the steps are judged to be yes, the battery cluster switch is closed;
the above-mentioned battery cluster includes at least one battery pack 6.
In the embodiment, a battery management system BMU7 is added in each battery pack6, so that the consistency of battery clusters is ensured, the service life of the battery clusters is prolonged, and the utilization rate and the energy storage effect of an energy storage power station are improved;
meanwhile, BCMS3 of the battery cluster is used for primary protection, BAMS2 of the battery stack is used for secondary protection, and the battery PACK PACK6 is safer and more reliable to use, so that short circuit, overload, over-voltage and under-voltage and over-temperature and under-temperature detection and protection of the battery cluster and the battery stack are realized;
referring to fig. 3, a flowchart of a specific embodiment of a step S200 of an energy storage control protection method according to an embodiment of the present invention is shown, specifically including the following steps:
s210: PCS11 judges whether the alternating current and direct current voltage values are normal or not;
s220: EMS1 sends a start-up instruction to BAMS2 and PCS11;
s230: the EMS1 reads the state information of the PCS11 and the BAMS2 respectively;
s240: the EMS1 determines whether the energy storage system can be started to operate.
When the PCS11 determines that the ac and dc voltage values are abnormal, the following steps are performed:
s250: the PCS11 direct-current side switch is disconnected, and the BAMS2 monitors the direct-current switch state;
s260: PCS11 sends fault information to BAMS2 and uploads to EMS1;
when the EMS1 determines that the energy storage system cannot be started, the following steps are executed:
s270: EMS1 alarms;
thereafter, the above steps S250 and S260 are performed.
It can be understood that when the insulation performance is reduced, the PCS11 only monitors the insulation fault of the battery stack, and when a plurality of battery clusters are connected in parallel, the fault point is difficult to locate and maintain; according to the embodiment, the BAMS2 can acquire the data of the PACK6 in real time, and the data is uploaded to the EMS1 after being analyzed, so that the consistency of the SOC of the battery in the PACK6 is realized.
Specifically, the above-mentioned battery stack is formed after a plurality of battery clusters are connected in parallel, each battery cluster branch is formed by connecting battery PACKs 6 in series, and each battery PACK6 is formed by connecting batteries in parallel.
Referring to fig. 4, a flowchart of a specific embodiment of a step S300 of an energy storage control protection method according to an embodiment of the present invention is shown, specifically including the following steps:
s310: the BCMS3 and the battery cluster direct current monitoring unit 4 monitor whether the battery parameters of the branch of each battery cluster are normal or not;
s320: BAMS2 monitors whether the battery parameters of the main circuit of the battery cluster are normal;
the above battery parameters include battery current, battery voltage, battery temperature and battery SOC, but are not limited to the above parameters, and may be other parameters of the battery, which may be set according to the actual application scenario.
S330: PCS11 monitors whether the current and the voltage of a main circuit of the battery cluster are normal or not;
and if yes, the energy storage system operates normally.
When the BCMS3 and the battery cluster dc monitoring unit 4 monitor that the parameters of the branch battery of each battery cluster are abnormal, the following steps are executed:
s340: the battery cluster switch is disconnected, and the BCMS monitors the switch state of the battery cluster and records second fault information of the switch state;
s350: the BCMS sends second fault information to the BAMS;
s360: the main circuit main switch of the battery cluster is disconnected, the BAMS monitors the state of the main switch, and records the third fault information of the state of the switch;
s370: the PCS direct-current side switch is disconnected, and the BAMS monitors the direct-current switch state and records first fault information of the switch state;
s380: the BAMS transmits the first fault information, the second fault information, and the third fault information to the EMS.
Specifically, all the battery cluster data are uploaded in real time, the calculated SOC is more accurate, the charging can be performed in idle time, the discharging can be performed in busy time, the upper-level scheduling requirement is met by matching with PCS11, the power consumption of a user is ensured, and the energy storage economic benefit is embodied. The energy storage power station scheduling method and the energy storage power station scheduling device can increase schedulability and effectiveness of the energy storage power station, ensure electricity utilization of users, improve energy storage economic benefits and enable application to be wider.
The energy storage system in the embodiment is configured with a plurality of battery clusters, each battery cluster is subjected to charge and discharge management by the BCMS3, meanwhile, the BMU7 arranged in the PACK6 collects the voltage, the current and the temperature of the battery core of the PACK6, the SOC is calculated, real-time data are uploaded to the BCMS3 of each battery cluster branch, the consistency of the SOC of the battery core of the PACK6 is ensured, meanwhile, the DC detection unit DMU4 collects the voltage, the current and the insulation monitoring data of the battery cluster and uploads the voltage, the current and the insulation monitoring data to the BCMS3, and the BCMS3 realizes the protection of short circuit, overload, over-under voltage and over-under temperature of the battery cluster, so that the battery is protected for the first stage and is ensured to run in a safe voltage and current range; the maintenance switch MSD8 is arranged in the middle of the battery cluster, the switch adopts pluggable connection, has obvious visible points, and realizes voltage cracking and electrical isolation of the battery cluster, and because the maintenance switch MSD8 is provided with a fuse, short-circuit protection can be realized, the battery cluster branch circuit can be rapidly cut off within 10ms, and the battery cluster branch circuit and the electrical components on the main circuit are protected.
Specifically, the upper level of the BCMS3 is a battery stack management system BAMS2, the direct current detection unit DMU5 of the bus acquires voltage and current data of a battery cluster bus bar and uploads the data to the BAMS2 to perform charge and discharge management of the battery stack, and the battery stack can be protected by the BAMS2 by short circuit, overload, over-voltage and under-voltage and over-under-temperature, so that the energy storage system can be understood to be protected in a second level, the battery can be ensured to run in a safe voltage and current range and communicate with the PCS11, the PCS11 can realize full power or limited power charge and discharge according to the online quantity of the battery clusters and the SOC of the corresponding battery clusters, meanwhile, the data is uploaded to the EMS1 in real time, and the BAMS2 receives a scheduling instruction of the EMS1 to ensure the effectiveness of the scheduling instruction.
It will be appreciated that the bus bar described above is the main path of the battery cluster referred to in the examples.
The embodiments of the present invention have been described in detail with reference to the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present invention. Furthermore, embodiments of the invention and features of the embodiments may be combined with each other without conflict.

Claims (7)

1. The utility model provides an energy storage control protection method, characterized by that is applied to energy storage control protection system, energy storage control protection system includes a plurality of group battery PACKs, a plurality of group battery PACKs establish ties and form the battery cluster, a plurality of battery clusters form battery cluster branch road and battery cluster main road, every battery cluster branch road all is provided with battery cluster management unit BCMS, battery cluster main road is provided with battery stack management system BAMS, battery stack management system BAMS is connected with energy storage management system EMS, the method includes:
the battery cluster management unit BCMS receives a battery cluster switch closing instruction and judges whether the first control switch is closed or not; the first control switches are arranged on the battery cluster branches, and the first control switches of the battery cluster branches are connected in parallel and then connected with the battery stack management system BAMS;
when the battery cluster management unit BCMS judges that the first control switch is closed, an energy storage converter PCS direct-current side switch and a second control switch are closed, and an energy storage management system EMS judges whether the power-on operation can be performed; the second control switch and the direct-current side switch are arranged on a main circuit of the battery cluster, the direct-current side switch is connected with the direct-current side of the energy storage converter PCS, and the second control switch is connected with the alternating-current side of the energy storage converter PCS; the PCS is arranged on a main circuit of the battery cluster and is connected with the BAMS;
when the energy storage management system EMS judges that the power-on operation is possible, judging whether the energy storage system operates normally or not;
the judging whether the first control switch is closed specifically comprises the following steps:
the battery cluster management unit BCMS judges whether the battery parameters of the battery PACK are normal or not;
judging whether the voltage difference value between the battery clusters is smaller than a set value of the voltage difference value between the battery clusters, and judging whether the temperature difference value between the battery clusters is smaller than the set value of the temperature difference value between the battery clusters;
the battery cluster management unit BCMS judges whether the insulation resistance between the battery cluster and the ground is normal or not;
the BAMS judges whether the first control switch and the second control switch are on line or not;
when the battery cluster management unit BCMS judges whether the battery parameters of the battery PACK are normal, judges whether the voltage difference between the battery clusters is smaller than the set value of the voltage difference between the battery clusters and the temperature difference between the battery clusters is smaller than the set value of the temperature difference between the battery clusters, the battery cluster management unit BCMS judges whether the insulation resistance between the battery clusters and the ground is normal, and the battery stack management system BAMS judges whether the steps of the first control switch and the second control switch are online are all judged to be yes, the first control switch is closed;
the energy storage management system EMS judges whether the power-on operation can be performed or not, and specifically comprises the following steps:
the PCS of the energy storage converter judges whether the voltage values of alternating current and direct current are normal or not;
the energy storage management system EMS sends a starting command to the battery stack management system BAMS and the energy storage converter PCS;
the energy storage management system EMS respectively reads state information of the energy storage converter PCS and the battery stack management system BAMS;
the energy storage management system EMS judges whether the energy storage system can start up and operate according to the state information.
2. The energy storage control protection method according to claim 1, wherein when the PCS of the energy storage converter determines that the ac and dc voltage values are abnormal, the following steps are performed:
the method comprises the steps that a PCS direct-current side switch of an energy storage converter is disconnected, and a battery stack management system BAMS monitors the direct-current switch state of the PCS direct-current side switch of the energy storage converter and records first fault information of the direct-current switch state;
the PCS sends the first fault information to the BAMS and uploads the first fault information to the EMS;
when the energy storage management system EMS judges that the energy storage system cannot be started, the energy storage management system EMS gives an alarm and then executes the step of switching off the direct current side switch of the PCS of the energy storage converter, the cell stack management system BAMS monitors the direct current switch state of the direct current side switch of the PCS of the energy storage converter and records first fault information of the direct current switch state, and the PCS of the energy storage converter sends the first fault information to the cell stack management system BAMS and uploads the first fault information to the energy storage management system EMS.
3. The energy storage control protection method according to claim 2, wherein each of the battery cluster branches is connected in series with a battery cluster direct current monitoring unit, and a battery cluster management unit BCMS is connected with the battery cluster direct current monitoring unit and is used for controlling the battery cluster direct current monitoring unit, and the step of judging whether the energy storage system operates normally specifically comprises the following steps:
the battery cluster management unit BCMS and the battery cluster direct current monitoring unit monitor whether the battery parameters of the branch of each battery cluster are normal or not;
the BAMS monitors whether the parameters of the main battery of the battery cluster are normal or not;
the PCS of the energy storage converter monitors whether the current and the voltage of a main circuit of the battery cluster are normal or not;
and when all the steps of monitoring whether the branch battery parameters of each battery cluster are normal or not by the battery cluster management unit BCMS and the battery cluster direct current monitoring unit, monitoring whether the main battery parameters of the battery cluster are normal or not by the battery stack management system BAMS and monitoring whether the main current and the voltage of the battery cluster by the energy storage converter PCS are normal or not are judged to be yes, judging that the energy storage system is in normal operation.
4. The method for protecting energy storage control according to claim 3, wherein when the battery cluster management unit BCMS and the battery cluster direct current monitoring unit monitor that the battery parameters of each battery cluster branch are abnormal, the following steps are performed:
the method comprises the steps that a first control switch of a battery cluster branch is disconnected, and a battery cluster management unit BCMS monitors the switching state of the first control switch and records second fault information of the switching state;
the battery cluster management unit BCMS sends the second fault information to a battery stack management system BAMS;
the second control switch of the battery cluster main circuit is disconnected, and the battery stack management system BAMS monitors the total switch state of the second control switch and records third fault information of the total switch state;
the PCS direct-current side switch of the energy storage converter is disconnected, the battery stack management system BAMS monitors the state of the direct-current switch and records the first fault information of the state of the direct-current switch;
the battery stack management system BAMS transmits the first fault information, the second fault information and the third fault information to the energy storage management system EMS.
5. An energy storage control protection system applying the energy storage control protection method as claimed in claim 1, which is characterized by comprising a primary control protection device and a secondary control protection device, wherein the primary control protection device comprises a battery management unit BMU, a battery cluster management unit BCMS, a first battery cluster direct current monitoring unit and a first control switch; the secondary control protection device comprises a battery stack management system BAMS, an energy storage management system EMS, a second battery cluster direct current monitoring unit, an energy storage converter PCS and a second control switch, and the primary control protection device is controlled by the secondary control protection device;
the energy storage control protection system comprises a plurality of battery PACKs, wherein the battery PACKs are connected in series to form battery clusters, the battery clusters form battery cluster branches and battery cluster main circuits, each battery cluster branch is provided with a battery cluster management unit BCMS, the battery cluster main circuit is provided with a battery stack management system BAMS, and the battery stack management system BAMS is connected with an energy storage management system EMS; the first control switch is arranged on the battery cluster branch circuit, and the second control switch is arranged on the battery cluster main circuit; the energy storage converter PCS is arranged on the battery cluster main circuit, a first end of the energy storage converter PCS is connected with the second control switch, and a second end of the energy storage converter PCS is connected with the second battery cluster direct current monitoring unit; the first battery cluster direct current monitoring unit is arranged on a battery cluster branch and connected with the battery cluster management unit BCMS;
the battery management unit BMU is arranged in the battery PACK, and is used for monitoring data of the battery PACK and uploading the data to the battery cluster management unit BCMS.
6. The energy storage control protection system of claim 5, wherein the first control switch comprises a service switch MSD and a contactor, and the second control switch comprises a circuit breaker.
7. The energy storage control protection system of claim 5, further comprising an isolation transformer, wherein an input of the isolation transformer is connected to a power grid, and wherein an output of the isolation transformer is connected to the second control switch.
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