CN117879017A - Energy storage system control method and energy storage system - Google Patents
Energy storage system control method and energy storage system Download PDFInfo
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- CN117879017A CN117879017A CN202410277072.4A CN202410277072A CN117879017A CN 117879017 A CN117879017 A CN 117879017A CN 202410277072 A CN202410277072 A CN 202410277072A CN 117879017 A CN117879017 A CN 117879017A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 358
- 238000000034 method Methods 0.000 title claims abstract description 72
- 238000012545 processing Methods 0.000 claims abstract description 22
- 238000001514 detection method Methods 0.000 claims description 12
- 238000005286 illumination Methods 0.000 claims description 12
- 238000009413 insulation Methods 0.000 claims description 12
- 230000008569 process Effects 0.000 claims description 12
- 238000012544 monitoring process Methods 0.000 claims description 11
- 238000004092 self-diagnosis Methods 0.000 claims description 6
- 238000007726 management method Methods 0.000 description 26
- 238000013461 design Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000009467 reduction Effects 0.000 description 3
- 230000002159 abnormal effect Effects 0.000 description 2
- 230000005856 abnormality Effects 0.000 description 2
- 230000008878 coupling Effects 0.000 description 2
- 238000010168 coupling process Methods 0.000 description 2
- 238000005859 coupling reaction Methods 0.000 description 2
- 230000007257 malfunction Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000003287 optical effect Effects 0.000 description 2
- 238000003825 pressing Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- HEZMWWAKWCSUCB-PHDIDXHHSA-N (3R,4R)-3,4-dihydroxycyclohexa-1,5-diene-1-carboxylic acid Chemical compound O[C@@H]1C=CC(C(O)=O)=C[C@H]1O HEZMWWAKWCSUCB-PHDIDXHHSA-N 0.000 description 1
- 201000010743 Lambert-Eaton myasthenic syndrome Diseases 0.000 description 1
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- 230000006641 stabilisation Effects 0.000 description 1
- 238000011105 stabilization Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/001—Methods to deal with contingencies, e.g. abnormalities, faults or failures
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
- H02J2300/26—The renewable source being solar energy of photovoltaic origin involving maximum power point tracking control for photovoltaic sources
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides an energy storage system control method and an energy storage system, wherein the method comprises the following steps: pre-charging an energy storage converter of a target energy storage system to perform voltage lifting treatment on the direct-current bus voltage until the direct-current bus voltage of the target energy storage system meets preset conditions; sequentially performing high-voltage treatment on each component of a first electric cabinet of a target energy storage system, wherein the first electric cabinet is any electric cabinet of the target energy storage system; if any component of the first electric cabinet fails to be subjected to high voltage, performing low-voltage processing on the first electric cabinet, and performing high-voltage processing on the next electric cabinet of the first electric cabinet in the target energy storage system; and if the high voltage on the first electric cabinet is successful, performing high voltage treatment on the next electric cabinet of the first electric cabinet in the target energy storage system.
Description
Technical Field
The application relates to the technical field of energy storage control, in particular to an energy storage system control method and an energy storage system.
Background
The energy storage system may be based on different requirements, and various corresponding designs exist. The various design schemes lead to complex operation conditions, so that the control modes of the energy storage system are different under different design schemes and operation scenes, and the energy storage system is not controlled sufficiently.
Disclosure of Invention
The purpose of the application is to provide an energy storage system control method and an energy storage system, which can better realize the control of the energy storage system under various different designs.
In a first aspect, the present invention provides a method for controlling an energy storage system, including: pre-charging an energy storage converter of a target energy storage system to perform voltage lifting treatment on the direct-current bus voltage until the direct-current bus voltage of the target energy storage system meets preset conditions; sequentially performing high-voltage treatment on each component of a first electric cabinet of a target energy storage system, wherein the first electric cabinet is any electric cabinet of the target energy storage system; if any component of the first electric cabinet fails to be subjected to high voltage, performing low-voltage processing on the first electric cabinet, and performing high-voltage processing on the next electric cabinet of the first electric cabinet in the target energy storage system; and if the high voltage on the first electric cabinet is successful, performing high voltage treatment on the next electric cabinet of the first electric cabinet in the target energy storage system.
According to the embodiment, the upper high voltage can be controlled one by one based on the minimum unit electric cabinet of the energy storage system, and the control of the energy storage system under different designs can be better compatible. Further, the high voltage on the previous electric cabinet is successfully processed on the next electric cabinet, and the high voltage on the all electric cabinets is realized in a one-by-one mode. Or, the upper high voltage process of the next electric cabinet can be continued after the failure of the upper high voltage of the previous electric cabinet is determined, and the upper high voltage processes of other electric cabinets are not affected even if the electric cabinet is stored abnormally, so that the control of the energy storage system can be better realized, and the service provided by the effective units of the energy storage system can be better exerted.
In an alternative embodiment, the method further comprises: judging whether any component of the first electric cabinet fails or not, or whether any component of the first electric cabinet is successfully high-voltage within a first appointed duration; and if the component of the first electric cabinet fails or fails to be high-voltage over a first designated time period, indicating that the component fails to be high-voltage.
In the embodiment, the fact that the electric cabinet is not successfully powered on by high voltage can be determined in two ways, the influence of the abnormality of the electric cabinet on the system starting can be reduced through the time limit of the first appointed duration, and the control efficiency of the energy storage system is improved.
In an alternative embodiment, the determining whether the component of the first electric cabinet malfunctions includes: and acquiring self-diagnosis data of the components of the first electric cabinet through an energy storage domain controller of the target energy storage system, and judging whether the components of the first electric cabinet have faults or not according to the self-diagnosis data.
In an alternative embodiment, the determining whether the component of the first electric cabinet malfunctions includes: and diagnosing the components of the first electric cabinet through the energy storage domain controller of the target energy storage system so as to judge whether the components of the first electric cabinet have faults or not.
In the embodiment, the fault can be found through two modes of active reporting and passive finding, so that the fault can be found more accurately, the fault omission rate is reduced, and the probability of unsuccessful starting of the energy storage system caused by the fault can be reduced.
In an alternative embodiment, the method further comprises: after high voltage is applied to each component of the first electric cabinet, performing insulation detection on the first electric cabinet; and if the insulation detection of the first electric cabinet is passed, the high voltage on the first electric cabinet is represented to be successful.
In the embodiment, the electric cabinet can be further subjected to insulation detection, so that the safety of the energy storage system can be improved.
In an alternative embodiment, the method further comprises: and after all the electric cabinets of the target energy storage system are subjected to high-voltage treatment, performing high-voltage treatment on the energy storage converter of the target energy storage system.
In an alternative embodiment, the preset condition includes that the difference between the dc bus voltage and the battery voltage is not less than a specified voltage threshold; the method further comprises the steps of: judging whether the difference value between the direct current bus voltage of the target energy storage system and the battery voltage of the target energy storage system is smaller than a specified voltage threshold value or not; and if the difference value is smaller than the specified voltage threshold value, executing the step of pre-charging the energy storage converter of the target energy storage system to carry out the voltage lifting treatment on the direct current bus voltage until the difference value between the direct current bus voltage and the battery voltage is not smaller than the specified voltage threshold value, and then carrying out the high voltage treatment on the electric cabinet of the target energy storage system.
In the above embodiment, by judging the difference between the dc bus voltage of the target energy storage system and the battery voltage of the target energy storage system, when the energy storage converter cannot provide work, the energy storage converter can be lifted and pressed first, and after the lifting and pressing are successful, the electric cabinet is lifted and pressed, so that the control of the energy storage system can cover various situations more comprehensively, and the control effectiveness and success rate of the energy storage system are improved.
In an alternative embodiment, the method further comprises: and if the voltage of the direct current bus is not successfully increased until the difference value between the direct current bus voltage and the battery voltage of the target energy storage system is not smaller than a specified voltage threshold, performing low-voltage processing on the target energy storage system.
In the above embodiment, after the voltage lifting fails, the target energy storage system may be further subjected to a low-voltage treatment, so that the situation that an abnormal energy storage service is provided due to the high voltage success on the energy storage system which cannot normally work can be reduced.
In an alternative embodiment, the preset condition includes that the difference between the dc bus voltage and the battery voltage is not less than a specified voltage threshold; if the photovoltaic module of the target energy storage system does not have illumination, the energy storage converter of the target energy storage system is precharged to carry out voltage raising treatment on the voltage of the direct current bus, and the method comprises the following steps: according to a preset initial value, the energy storage converter of the target energy storage system is precharged through a power supply until the voltage of the direct current bus of the target energy storage system reaches the starting second electric cabinet; after the second electric cabinet is started, the energy storage domain controller of the target energy storage system pre-charges the energy storage converter according to the maximum voltage control of the second electric cabinet so as to carry out voltage lifting treatment on the direct current bus voltage until the difference value between the direct current bus voltage and the battery voltage of the target energy storage system is not smaller than a specified voltage threshold value, and then carries out high-voltage treatment on the electric cabinet of the target energy storage system.
In the above embodiment, the energy storage converter may be pre-charged by raising the dc bus voltage and performing high-voltage processing on the electric cabinet of the energy storage system after the pre-charging is successful, where the photovoltaic module of the energy storage system has no illumination, and the photovoltaic module may be powered by other power sources.
In an alternative embodiment, the pre-charging the energy storage converter of the target energy storage system by switching in a power supply until the dc bus voltage of the target energy storage system reaches the start-up second electric cabinet includes: performing first pre-charging on an energy storage converter of the target energy storage system through a power supply to raise the voltage of the direct current bus, and starting the converter of the second electric cabinet when the voltage of the direct current bus is not smaller than the starting voltage of the converter of the second electric cabinet; and controlling to close an auxiliary source relay of the second electric cabinet so as to supply the converted direct-current bus voltage to a battery management system of the second electric cabinet through a direct-current converter of the second electric cabinet, so as to start the battery management system to start the second electric cabinet.
In an alternative embodiment, the method further comprises: performing fault monitoring on each component of the target energy storage system through an energy storage domain controller of the target energy storage system; after any one component is monitored to have faults, if the type of the faults is component faults, controlling the high voltage of the faulty component; and if the type of the fault is a system fault, controlling the target energy storage system to lower high voltage.
In the above embodiment, the energy storage domain controller may be further configured to actively monitor the failure of each component of the target energy storage system, so that a suitable high-voltage-down mode may be selected to lower the high voltage of the component of the energy storage system when the component fails, thereby reducing the influence of the failed component on the operation of the energy storage system, and also enabling the energy storage system to continue to operate.
In an alternative embodiment, the controlling the sub-assembly high pressure process includes: reducing the power of the assembly; and monitoring the real-time power of the component until the real-time power of the component is smaller than a first power threshold value, or controlling the component to lower high voltage after a period of time for starting to reduce the power of the component exceeds a second specified period of time.
In the above embodiment, when the real-time power of the component is smaller than the first power threshold, the component with the fault control is further pressed down, so that the relay is cut off when the power of the component is not reduced to the allowable power threshold, and the service life of the component is affected. Furthermore, the high voltage of the component can be controlled based on the fact that the time length of the high voltage is longer than the second designated time length, so that long-time clamping in the high voltage process can be avoided, and the control efficiency of the energy storage system is improved.
In an alternative embodiment, the method further comprises: and determining the second appointed duration according to the level of the fault of the monitored component.
In an alternative embodiment, the controlling the target energy storage system low-voltage includes: reducing the power of an electric cabinet, an energy storage converter and a maximum power point tracking controller of the target energy storage system; and monitoring the real-time power of the electric cabinet and the energy storage converter until the real-time power of the electric cabinet and the energy storage converter is smaller than a first power threshold, or controlling the electric cabinet and the energy storage converter to lower high voltage until the time for starting to reduce power exceeds a third designated time so as to realize the target energy storage system to lower high voltage.
In an alternative embodiment, the method further comprises: and determining the third appointed duration according to the level of the fault of the monitored component.
In the above embodiment, the energy storage domain controller may be further configured to actively monitor each component of the target energy storage system for a fault, so that the energy storage system may be selectively pressurized under a condition that the component has a fault and the normal use of the energy storage system is affected by the fault, so that the influence of the fault component on the energy storage system is reduced, the probability of a safety accident caused by the work provided by the fault energy storage system is also reduced, and the working safety of the energy storage system is improved. Furthermore, the high-voltage of the energy storage system can be controlled based on the fact that the time length of planning the high-voltage to be controlled exceeds the third specified time length, so that the energy storage system can be prevented from being blocked in the high-voltage process for a long time, and the control efficiency of the energy storage system is improved.
In a second aspect, the present invention provides an energy storage system comprising: the photovoltaic module, the energy storage domain controller, the energy storage converter, the electric cabinet and the maximum power point tracking controller; the energy storage system is configured to perform the energy storage system control method according to any one of the foregoing embodiments.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic architecture diagram of an energy storage system according to an embodiment of the present disclosure;
FIG. 2 is a schematic diagram of a portion of an energy storage system according to an embodiment of the present disclosure;
FIG. 3 is a flowchart of a method for controlling an energy storage system according to an embodiment of the present disclosure;
FIG. 4 is a second flowchart of a method for controlling an energy storage system according to an embodiment of the present disclosure;
FIG. 5 is a third flowchart of a method for controlling an energy storage system according to an embodiment of the present disclosure;
FIG. 6 is a fourth flowchart of a method for controlling an energy storage system according to an embodiment of the present disclosure;
FIG. 7 is a fifth flowchart of a method for controlling an energy storage system according to an embodiment of the present disclosure;
fig. 8 is a sixth flowchart of a method for controlling an energy storage system according to an embodiment of the present application.
Icon: 110-a photovoltaic module; 120-an energy storage domain controller; 130-an energy storage converter; 140-an electric cabinet; 141-a battery management system; 142-dc converter; 150-a maximum power point tracking controller; 160-auxiliary source.
Detailed Description
The technical solutions in the embodiments of the present application will be described below with reference to the drawings in the embodiments of the present application.
It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures. Meanwhile, in the description of the present application, the terms "first", "second", and the like are used only to distinguish the description, and are not to be construed as indicating or implying relative importance.
The current start to energy storage system is generally through energy storage system's shift knob one-key start, this shift knob sets up in the direct current side generally, can start through pressing shift knob one-key when energy storage system shut down, energy storage system can switch on inside direct current busbar earlier, output the electric quantity in order to start Battery Management System (BMS) and power consumption load through direct current converter (DC/DC) switching power supply with battery inside first, BMS controller starts the work after high-voltage relay high-voltage in order to change auxiliary source power supply from battery inside into system direct current busbar end, the battery outside output continues to maintain BMS and power consumption load's normal work, in order to accomplish energy storage system's last high-voltage process. The on-off of the grid-connected switch at the alternating current side of the system can be controlled according to the voltage condition at the power grid side, the energy storage converter is selected to work in a grid-connected mode or an off-grid mode, and finally the operation of the energy storage system is realized. This one-touch approach may result in a failure of the entire energy storage system when there is a failure of some of the components in the energy storage system, or when there is a high calendering on the components or when there is a failure to successfully put high pressure on the components.
Based on the above, the control method of the energy storage system can be used for increasing the voltage on the electric cabinets of the energy storage system one by one, and even if the individual electric cabinets cannot be successfully increased in voltage, the control method can be used for increasing the voltage on the next electric cabinet, so that the effective electric cabinet can be started. Therefore, the starting of the energy storage system and the work of the energy storage system are not affected even if the individual electric cabinets cannot successfully supply high voltage.
In the following, for ease of understanding, the energy storage system to be controlled will be described. The energy storage system provided by the embodiment of the application can be an optical storage direct current coupling system. As shown in fig. 1, the energy storage system may include: photovoltaic (PV) modules, energy storage domain controllers 120 (Local Energy Management System, LEMS) may also be referred to as local energy management systems, energy storage converters 130 (Power Conversion System, PCS), electrical cabinets 140, and maximum power point tracking controllers 150 (Maximum Power Point Tracking, MPPT).
In this embodiment, the electric cabinet 140 includes a battery, a battery management system 141 (Battery Management System, abbreviated as BMS), and a direct current converter 142 (DC-to-DC converter, abbreviated as DCDC). In the example shown in fig. 1, the energy storage system may include n energy storage systems, namely a first electrical cabinet, a second electrical cabinet, …, and an nth electrical cabinet.
In the example shown in fig. 1, the energy storage system is an optical storage dc coupling system, and the energy storage domain controller 120 controls the operation of the whole energy storage system, which includes operations such as high-voltage power-on and power-off, bus voltage stabilization, energy distribution, fault handling, and the like. The energy storage converter 130 performs ac-side and dc-side current conversion. The battery management system 141 controls battery charging or discharging to enable storage and release of energy. The dc converter 142 may perform voltage control according to the battery system voltage and the dc bus voltage; the photovoltaic module 110 may convert the illumination into electrical energy. The maximum power point tracking controller 150 may perform maximum power tracking control.
Fig. 2 shows a schematic diagram of a portion of the architecture of an energy storage system. The photovoltaic module 110, the energy storage domain controller 120, the energy storage converter 130, the electrical cabinet 140, and the maximum power point tracking controller 150 are shown, as well as the battery management system 141 and the dc converter 142 contained in the electrical cabinet 140. In the example shown in fig. 2, the maximum power point tracking controller 150 includes an auxiliary source 160, the energy storage converter 130 also includes the auxiliary source 160, and the dc converter 142 also includes the auxiliary source 160.
The maximum power point tracking controller 150 has voltage output when the photovoltaic module 110 has illumination, and the battery management system 141 and the auxiliary source 160 of the direct current converter 142 can normally communicate after power is supplied; when the photovoltaic module 110 is not illuminated, the battery management system 141 and the auxiliary source 160 of the dc converter 142 are not powered and cannot communicate. The power supplied by the energy storage domain controller 120 and the auxiliary source 160 of the energy storage converter 130 is derived from the power grid.
In this embodiment, the energy storage domain controller 120 may monitor each component of the energy storage system to obtain the status of each component, and discover the abnormality of each component in time. For example, the energy storage domain controller 120 obtains whether a component has a fault by communicating with the component. The various components may also communicate with the energy storage domain controller 120 to report their own status.
The upper high voltage flow and the lower high voltage flow of the energy storage system are described below in connection with an energy storage system control method. Referring to fig. 3, a flowchart of a method for controlling an energy storage system according to an embodiment of the present application is shown. The steps of the method provided in this embodiment may be performed by the energy storage system described above. The specific flow shown in fig. 3 will be described in detail.
Step 210, pre-charging the energy storage converter of the target energy storage system to perform voltage raising treatment on the direct current bus voltage until the direct current bus voltage of the target energy storage system meets a preset condition.
Step 220 is executed again when the dc bus voltage satisfies a predetermined condition.
And 220, sequentially performing high-voltage processing on all components of the first electric cabinet of the target energy storage system.
The first electric cabinet is any electric cabinet of the target energy storage system.
For example, the electrical cabinets of the energy storage system may be numbered in advance, and the high voltages on the electrical cabinets may be sequentially numbered. For example, the high voltage on the electric cabinet can be performed sequentially from small to large according to the number of the electric cabinet.
For example, the first electrical cabinet may be the i-th electrical cabinet, and then the next electrical cabinet of the first electrical cabinet may be the i+1-th electrical cabinet. In the example shown in fig. 1, the energy storage system includes n electrical cabinets, and the value of i is any positive integer less than n.
In the embodiment, after high voltage is applied to each component of the first electric cabinet, insulation detection is performed on the first electric cabinet; if the insulation detection of the first electric cabinet is passed, the high voltage on the first electric cabinet is successfully represented.
In one case, if any of the components of the first electrical cabinet fail at high voltage; step 240 is performed. In another case, step 240 may also be performed after the high voltage on the first electrical cabinet is successful.
Optionally, it may also be determined, before step 220, whether there is illumination on the photovoltaic module of the target energy storage system, and whether the voltage difference between the dc bus voltage and the battery voltage of the target energy storage system is greater than or equal to the specified voltage threshold. When there is illumination in the photovoltaic module, and the voltage difference between the dc bus voltage and the battery voltage of the target energy storage system is greater than or equal to the specified voltage threshold, the above-mentioned step 220 is executed again.
And 240, performing low-voltage treatment on the first electric cabinet.
Step 260 is performed after the completion of step 240.
Step 260, performing high-voltage processing on the next electric cabinet of the first electric cabinet in the target energy storage system.
The above steps 220 and 260 are repeated until all the electrical cabinets of the target energy storage system are subjected to the upper high voltage process.
As shown in fig. 4, step 270 may also be performed after the high voltage flow on the electrical cabinet of the target energy storage system is traversed.
Step 270, performing upper high voltage processing on the energy storage converter of the target energy storage system.
Illustratively, if the high voltage is requested from the energy storage converter and the energy storage converter is not successfully powered up for a third specified period of time after the request is issued, step 280 is performed to power the target energy storage system down.
If the energy storage converter can successfully carry out high voltage, the energy storage converter can be subjected to insulation detection, and if the insulation resistance value is normal, the high voltage on the target energy storage system is determined to be successful.
Through the steps, even if the individual electric cabinets cannot successfully carry out high voltage, the residual electric cabinets can be subjected to high voltage treatment so as to realize power supply by using other electric cabinets. And the effective utilization rate of the energy storage system is improved.
In order to improve that each electric cabinet of going up high voltage can normally work, go up the high voltage in-process to each subassembly of first electric cabinet, can discern the fault condition of subassembly of first electric cabinet. Based on this, the energy storage system control method may further include: step 231, determining whether a component of the first electrical cabinet is malfunctioning.
In one embodiment, the self-diagnosis data of the components of the first electric cabinet can be obtained through the energy storage domain controller of the target energy storage system, and whether the components of the first electric cabinet have faults or not is judged according to the self-diagnosis data.
In another embodiment, the components of the first electrical cabinet are diagnosed by an energy storage domain controller of the target energy storage system to determine if the components of the first electrical cabinet are malfunctioning.
Step 232, whether any of the components of the first electrical cabinet are successfully powered up for a first specified period of time.
And if the component of the first electric cabinet fails or fails to be high-voltage for more than a first designated time, indicating that the high-voltage on the component fails.
The first specified duration may be set as desired. For example, the duration of the integer multiple of the duration required for high voltage on the components of the electrical cabinet of a conventional energy storage system may be based. For example, if the time period required to activate one of the components of the electrical cabinet is 0.5s, the first specified time period may be determined to be 2s, 2.5s, 3s, etc.
The following components of the cabinet include a battery management system and a dc converter. To describe the flow of high voltage on the first electrical cabinet.
Illustratively, the components of the electrical cabinet include a battery management system and a dc converter. Sequentially performing the high voltage processing procedure on each component of the first electric cabinet of the target energy storage system may include: performing high-voltage treatment on a battery management system of the first electric cabinet; after the battery management system of the first electric cabinet finishes high voltage, the direct current converter of the first electric cabinet is subjected to high voltage; after the direct current converter of the first electric cabinet finishes high voltage, insulating detection is carried out on the first electric cabinet; if the insulation detection of the first electric cabinet is passed, the high voltage on the first electric cabinet is successfully represented.
Alternatively, the first electric cabinet may be subjected to a low-voltage process when any one of the components of the battery management system and the dc converter of the first electric cabinet fails. Alternatively, the energy storage system may be subjected to a low-voltage process when any one of the components of the battery management system and the dc converter of the first electric cabinet fails.
Alternatively, the first electric cabinet may be subjected to the low-voltage processing when any one of the components in the battery management system and the dc converter of the first electric cabinet is not successfully subjected to the high-voltage exceeding the first specified period. The processing mode firstly enables the normal electric cabinet to be high in voltage, the energy storage system can operate, photovoltaic energy can be utilized to the maximum extent, and the power supply requirement is met.
Alternatively, the energy storage system may be subjected to a low-voltage treatment when any one of the battery management system and the dc converter of the first electric cabinet fails to be subjected to a high voltage for more than a first specified period of time. The processing mode needs to ensure that the electric cabinets of the target energy storage system are normal, the energy storage system can only operate, and the shutdown maintenance work of the energy storage system can be reduced.
When the difference between the voltage of the direct current bus of the energy storage system and the voltage of the battery is too large to meet the voltage required by high voltage on the energy storage converter of the energy storage system, the energy storage converter cannot be started to work successfully. Thus, as shown in fig. 5, the preset conditions described above may include that the difference between the dc bus voltage and the battery voltage is not less than a specified voltage threshold. The energy storage system control method may further include the following steps before performing step 210.
Step 201, determining whether a difference between a dc bus voltage of the target energy storage system and a battery voltage of the target energy storage system is less than a specified voltage threshold.
If the difference is less than the specified voltage threshold, step 210 is performed. If the difference is not less than the specified voltage threshold, step 220 is performed.
Alternatively, the dc bus voltage may be collected by an energy storage converter and the battery voltage may be collected by a battery management system. The energy storage domain controller can acquire data acquired by the energy storage converter and data acquired by the battery management system to judge whether the difference value between the direct current bus voltage of the target energy storage system and the battery voltage of the target energy storage system is smaller than a specified voltage threshold.
Wherein the specified voltage threshold is a calibratable value. For example, the specified voltage threshold may be 90V, 100V, 110V, etc.
Illustratively, the step 210 may include a step 211 of pre-charging the energy storage converter of the target energy storage system to step-up the dc bus voltage until the difference between the dc bus voltage and the battery voltage is not less than a specified voltage threshold.
If the dc bus voltage is raised, the difference between the dc bus voltage and the battery voltage is not less than the specified voltage threshold, and step 220 is performed.
If the voltage of the dc bus is not successfully raised to the difference between the dc bus voltage and the battery voltage is not less than the specified voltage threshold, step 280 is performed.
And 280, performing downward high-pressure treatment on the target energy storage system.
In one embodiment, when the target energy storage system needs to be subjected to high voltage, the power of an electric cabinet, an energy storage converter and a maximum power point tracking controller of the target energy storage system can be reduced; and monitoring the real-time power of the electric cabinets and the energy storage converters until the real-time power of all the electric cabinets and the energy storage converters is smaller than a first power threshold value, and controlling the high voltage of the electric cabinets and the energy storage converters to realize the high voltage of the target energy storage system.
The first power threshold may be set according to an actual use condition of the target energy storage device, or may be set according to a design architecture of the target energy storage device, for example, the first power may be 2kw.
In another embodiment, when the target energy storage system needs to be subjected to high voltage, the power of an electric cabinet, an energy storage converter and a maximum power point tracking controller of the target energy storage system can be reduced; and monitoring the real-time power of the electric cabinets and the energy storage converters, and if the time length for starting the power reduction exceeds the fourth appointed time length, controlling the high voltage of the electric cabinets and the energy storage converters still to realize the high voltage of the target energy storage system if the real-time power of all the electric cabinets and the energy storage converters is not smaller than the first power threshold value.
Alternatively, the fourth specified duration may be set as desired. For example, the fourth specified duration may be different depending on the level of the fault. For example, the fourth specified duration may be set to a relatively short duration for some serious faults, for example, at this time the fourth specified duration may be 2s, 2.5s, or the like. As another example, the fourth specified duration may be set to a relatively long duration for some minor faults, for example, at which time the fourth specified duration may be 4.5s, 5s, 6s, etc.
Through the flow, under the condition that the voltage of the direct-current bus does not meet the requirement, the voltage raising treatment can be performed firstly, so that the energy storage converter can successfully carry out high voltage, the energy storage converter can carry out current conversion between an alternating current side and a direct current side, and the target energy storage system can work more stably and lowly after the high voltage is completed. Under the condition that the energy storage converter cannot successfully supply high voltage, the high voltage of the target energy storage system can be controlled, the probability of abnormal operation of the target energy storage system can be reduced, and the safety of the operation of the target energy storage system is improved.
In one case, when the photovoltaic module of the target energy storage system is not illuminated, the auxiliary sources of the battery management system and the dc converter are not powered and cannot communicate. The auxiliary source power supply of the energy storage converter and the energy storage domain controller is derived from a power grid. Based on this, as shown in fig. 6, the method for controlling an energy storage system provided in the embodiment of the present application may further include:
step 202, determining whether there is illumination in the photovoltaic module of the target energy storage system.
If there is no illumination of the photovoltaic module, step 210 described above may include step 212 and step 213.
Step 212, pre-charging the energy storage converter of the target energy storage system by accessing a power supply according to the preset initial value until the voltage of the direct current bus of the target energy storage system reaches the start-up second electric cabinet.
The preset initial value may be a value set as needed, which may be set in advance after enabling the method to achieve control of the energy storage system, by which the energy storage converter is pre-charged, for example.
The energy storage converter of the target energy storage system is subjected to first pre-charging through a power supply so as to raise the voltage of the direct current bus, and when the voltage of the direct current bus is not smaller than the starting voltage of the converter of the second electric cabinet, the converter of the second electric cabinet is started; and controlling to close an auxiliary source relay of the second electric cabinet so as to supply power to a battery management system of the second electric cabinet through the converted direct current bus voltage of the direct current converter of the second electric cabinet, so as to start the battery management system to start the second electric cabinet.
And step 213, after the second electric cabinet is started, the energy storage domain controller of the target energy storage system pre-charges the energy storage converter according to the maximum voltage control of the second electric cabinet so as to carry out voltage lifting treatment on the direct-current bus voltage.
Until the difference between the voltage of the direct current bus and the voltage of the battery is not smaller than the specified voltage threshold, the step 220 is performed on the electric cabinet of the target energy storage system.
Through the steps, the high-voltage flow on the target energy storage system can be realized. Inevitably, during the use of the target energy storage system, some components may be failed, and in order to improve the working stability of the target energy storage system, as shown in fig. 7, the control method of the energy storage system according to the embodiment of the present application may further include the following steps.
Step 310, fault monitoring is performed on each component of the target energy storage system by the energy storage domain controller of the target energy storage system.
After any component is monitored to fail, if the type of failure is component failure, step 320 is performed. If the type of fault is a system fault, step 330 is performed.
Step 320, control the high voltage at the failed component.
Illustratively, when the component is required to be at a high voltage, the power of the component requiring the high voltage can be reduced; and monitoring the real-time power of the component until the real-time power of the component is smaller than a first power threshold value, or controlling the component to lower high voltage from the time when the power of the component needing to lower high voltage is reduced to exceed a second designated time.
Wherein the second specified duration may be determined based on the level of failure of the monitored component. Wherein the higher the risk level of failure of the component, the shorter the second specified time period, for example, when the risk level of failure is high, the second specified time period may be set to a time period of 1.5s, 2s, 2.5s, or the like. The lower the risk level of failure of the component, the longer the second specified time period, the second specified time period may be set to be 5s, 5.5s, 6s, etc. in time period.
If the failed component is one of the upper high voltage electrical cabinets, the electrical cabinet may be requested to be powered down at high voltage. Illustratively, the under-cabinet high voltage flow may be expressed as: starting to reduce the power of the electric cabinet, calculating the real-time power of the electric cabinet, waiting for the power reduction of the electric cabinet, and simultaneously carrying out high-voltage overtime timing under the electric cabinet, wherein if the power of the electric cabinet is smaller than a first power threshold corresponding to the electric cabinet or the time length from starting to reduce the power of the electric cabinet exceeds a second designated time length, the high-voltage under the electric cabinet can be requested. Specifically, the high voltage of the direct current converter of the electric cabinet is requested and the time-out of the high voltage of the direct current converter is timed, and when the high voltage of the direct current converter is successful or the high voltage of the direct current converter is requested to be time-out, the high voltage of the battery management system of the electric cabinet can be requested.
In this embodiment, if there is no high voltage on the electric cabinet and the electric cabinet has no fault, when the voltage difference between the dc bus voltage and the battery voltage is not less than the specified voltage threshold, the high voltage on the electric cabinet is requested again, and the high voltage flow on the electric cabinet is executed.
In this embodiment, when all the electric cabinets in the target energy storage system are under high voltage, the system working mode is photovoltaic power grid.
If the failed component is an energy storage converter, the energy storage converter may be requested to be powered down at a high voltage.
Illustratively, the low-high voltage flow of the energy storage converter may be expressed as: starting to reduce the power of the energy storage converter, calculating the real-time power of the energy storage converter, waiting for the power reduction of the energy storage converter, timing the high voltage of the energy storage converter overtime, and requesting the high voltage of the energy storage converter if the power of the energy storage converter is smaller than a first power threshold corresponding to the energy storage converter or the time for starting to reduce the power of the energy storage converter exceeds a second designated time. When the energy storage converter is under high voltage, the working mode of the target energy storage system is photovoltaic and the energy storage system.
Step 330, control the target energy storage system to lower high voltage.
Illustratively, when the target energy storage system is required to be at high voltage, the power of an electric cabinet, an energy storage converter and a maximum power point tracking controller of the target energy storage system can be reduced; and monitoring the real-time power of the electric cabinets and the energy storage converters until the real-time power of all the electric cabinets and the energy storage converters is smaller than a first power threshold value, or the time for starting to reduce the power exceeds a third specified time, and controlling the high voltage of the electric cabinets and the energy storage converters to realize the high voltage of the target energy storage system.
In this embodiment, the third specified duration is determined according to the level of the failure of the monitored component.
Wherein the third specified duration may be determined based on the level of failure of the monitored component. The third specified duration may be set to be 1.5s, 2s, 2.5s, etc. when the risk level of the system failure caused by the component is higher, for example, the third specified duration is shorter. When serious faults occur, high voltage can be quickly lowered, and the probability of more serious accidents caused by the fault target energy storage system is reduced.
The lower the risk level of the failure of the component, the longer the third specified duration, the third specified duration may be set to a duration of 5s, 5.5s, 6s, 7s, 8s, or the like. When a slight fault occurs, the power can be reduced for a longer time, so that the relay is prevented from being cut off when the power of the electric cabinet or the energy storage converter is not reduced to an allowable power threshold value, and the service life of the assembly is prevented from being influenced.
The severity level of the failure of the component can be set according to the actual situation.
After all components of the target energy storage system have completed the high-voltage down, it may be determined again by the flow of fig. 3-6 whether the target energy storage system meets the high-voltage down.
As shown in fig. 8, the following describes the energy storage system control method provided in the embodiment of the present application with reference to an example:
Step 410, determining whether there is illumination in the photovoltaic module of the target energy storage system.
If no illumination exists, step 420 is performed; if there is illumination, step 440 is performed.
Step 420, according to a preset initial value of the energy storage system, the energy storage converter of the target energy storage system is pre-charged by accessing a power supply until the voltage of the direct current bus of the target energy storage system reaches to start one of the electric cabinets.
Step 430, after one of the electric cabinets is started, the energy storage domain controller of the target energy storage system pre-charges the energy storage converter according to the maximum voltage control of the started electric cabinet so as to perform voltage lifting treatment on the direct current bus voltage.
Until the difference between the voltage of the direct current bus and the voltage of the battery is not smaller than the specified voltage threshold, the upper high voltage processing is performed on the electric cabinet of the target energy storage system through steps 460 to 480.
In this embodiment, if the dc bus voltage cannot be raised to meet the difference between the dc bus voltage and the battery voltage not less than the specified voltage threshold, step 490 is performed to lower the high voltage on the target energy storage system.
Step 440, determining whether the difference between the dc bus voltage of the target energy storage system and the battery voltage of the target energy storage system is less than a specified voltage threshold.
If the difference is less than the specified voltage threshold, then step 450 is performed; if the difference is not less than the specified voltage threshold, then the electrical cabinet of the target energy storage system is subjected to a high voltage processing through steps 460 through 480.
Step 450, pre-charging the energy storage converter of the target energy storage system to perform voltage raising treatment on the direct current bus voltage until the difference value between the direct current bus voltage and the battery voltage is not smaller than the specified voltage threshold.
And step 460, performing upper high-voltage treatment on the target electric cabinet of the target energy storage system.
The target electric cabinet can be any electric cabinet in the target energy storage system. For example, the upper high voltage of the target electric cabinet can be achieved by performing upper high voltage processing on the components of the target electric cabinet and then performing insulation detection on the target electric cabinet.
If any component in the high voltage process on the target electric cabinet fails to successfully perform high voltage or insulation detection on the target electric cabinet fails, the high voltage processing can be performed on the target electric cabinet through step 470.
And 470, performing downward high-voltage processing on the target electric cabinet.
And 480, performing upper high-voltage processing on the next electric cabinet of the target electric cabinets in the target energy storage system.
By repeating the above steps 460 to 480, the high voltage is applied to each electric cabinet of the target energy storage system.
Step 490, performing a low-voltage process on the target energy storage system.
Additional details regarding this example may be found in the previous step descriptions, which are not repeated here.
In the method provided by the embodiment of the application, the starting of the target energy storage system in different scenes can be realized, various control modes are realized on the components and the up-down high-voltage flow of the target energy storage system, the system can be ensured to operate under different working conditions, and the influence of system shutdown is reduced.
The foregoing description is only of the preferred embodiments of the present application and is not intended to limit the same, but rather, various modifications and variations may be made by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application should be included in the protection scope of the present application. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further definition or explanation thereof is necessary in the following figures.
The foregoing is merely specific embodiments of the present application, but the scope of the present application is not limited thereto, and any person skilled in the art can easily think about changes or substitutions within the technical scope of the present application, and the changes and substitutions are intended to be covered by the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (16)
1. A method of controlling an energy storage system, comprising:
pre-charging an energy storage converter of a target energy storage system to perform voltage lifting treatment on the direct-current bus voltage until the direct-current bus voltage of the target energy storage system meets preset conditions;
sequentially performing high-voltage treatment on each component of a first electric cabinet of a target energy storage system, wherein the first electric cabinet is any electric cabinet of the target energy storage system;
if any component of the first electric cabinet fails to be subjected to high voltage, performing low-voltage processing on the first electric cabinet, and performing high-voltage processing on the next electric cabinet of the first electric cabinet in the target energy storage system;
and if the high voltage on the first electric cabinet is successful, performing high voltage treatment on the next electric cabinet of the first electric cabinet in the target energy storage system.
2. The method according to claim 1, wherein the method further comprises:
judging whether any component of the first electric cabinet fails or not, or whether any component of the first electric cabinet is successfully high-voltage within a first appointed duration;
and if the component of the first electric cabinet fails or fails to be high-voltage over a first designated time period, indicating that the component fails to be high-voltage.
3. The method of claim 2, wherein the determining whether a component of the first electrical cabinet is malfunctioning comprises:
and acquiring self-diagnosis data of the components of the first electric cabinet through an energy storage domain controller of the target energy storage system, and judging whether the components of the first electric cabinet have faults or not according to the self-diagnosis data.
4. The method of claim 2, wherein the determining whether a component of the first electrical cabinet is malfunctioning comprises:
and diagnosing the components of the first electric cabinet through the energy storage domain controller of the target energy storage system so as to judge whether the components of the first electric cabinet have faults or not.
5. The method according to claim 1, wherein the method further comprises:
after high voltage is applied to each component of the first electric cabinet, performing insulation detection on the first electric cabinet;
and if the insulation detection of the first electric cabinet is passed, the high voltage on the first electric cabinet is represented to be successful.
6. The method according to any one of claims 1-5, further comprising:
and after all the electric cabinets of the target energy storage system are subjected to high-voltage treatment, performing high-voltage treatment on the energy storage converter of the target energy storage system.
7. The method according to any one of claims 1 to 5, wherein the preset condition includes a difference between the dc bus voltage and the battery voltage being not less than a specified voltage threshold;
the method further comprises the steps of:
judging whether the difference value between the direct current bus voltage of the target energy storage system and the battery voltage of the target energy storage system is smaller than a specified voltage threshold value or not;
and if the difference value is smaller than the specified voltage threshold value, executing the step of pre-charging the energy storage converter of the target energy storage system to carry out the voltage lifting treatment on the direct current bus voltage until the difference value between the direct current bus voltage and the battery voltage is not smaller than the specified voltage threshold value, and then carrying out the high voltage treatment on the electric cabinet of the target energy storage system.
8. The method of claim 7, wherein the method further comprises:
and if the voltage of the direct current bus is not successfully increased until the difference value between the direct current bus voltage and the battery voltage is not smaller than a specified voltage threshold, performing low-high voltage processing on the target energy storage system.
9. The method according to any one of claims 1 to 5, wherein the preset condition includes a difference between the dc bus voltage and the battery voltage being not less than a specified voltage threshold;
If the photovoltaic module of the target energy storage system does not have illumination, the energy storage converter of the target energy storage system is precharged to carry out voltage raising treatment on the voltage of the direct current bus, and the method comprises the following steps:
according to a preset initial value, the energy storage converter of the target energy storage system is precharged through a power supply until the voltage of the direct current bus of the target energy storage system reaches the starting second electric cabinet;
after the second electric cabinet is started, the energy storage domain controller of the target energy storage system pre-charges the energy storage converter according to the maximum voltage control of the second electric cabinet so as to carry out voltage lifting treatment on the direct current bus voltage until the difference value between the direct current bus voltage and the battery voltage of the target energy storage system is not smaller than a specified voltage threshold value, and then carries out high-voltage treatment on the electric cabinet of the target energy storage system.
10. The method of claim 9, wherein pre-charging the energy storage converter of the target energy storage system by switching in a power supply until the dc bus voltage of the target energy storage system reaches a start-up second electrical cabinet, comprising:
performing first pre-charging on an energy storage converter of the target energy storage system through a power supply to raise the voltage of the direct current bus, and starting the converter of the second electric cabinet when the voltage of the direct current bus is not smaller than the starting voltage of the converter of the second electric cabinet;
And controlling to close an auxiliary source relay of the second electric cabinet so as to supply the converted direct-current bus voltage to a battery management system of the second electric cabinet through a direct-current converter of the second electric cabinet, so as to start the battery management system to start the second electric cabinet.
11. The method according to any one of claims 1-5, further comprising:
performing fault monitoring on each component of the target energy storage system through an energy storage domain controller of the target energy storage system;
after any one component is monitored to have faults, if the type of the faults is component faults, controlling the high voltage of the faulty component;
and if the type of the fault is a system fault, controlling the target energy storage system to lower high voltage.
12. The method of claim 11, wherein said controlling said sub-assembly high pressure process comprises:
reducing the power of the assembly;
and monitoring the real-time power of the component until the real-time power of the component is smaller than a first power threshold value, or controlling the component to lower high voltage after a period of time for starting to reduce the power of the component exceeds a second specified period of time.
13. The method according to claim 12, wherein the method further comprises:
And determining the second appointed duration according to the level of the fault of the monitored component.
14. The method of claim 11, wherein said controlling the target energy storage system low-pressure comprises:
reducing the power of an electric cabinet, an energy storage converter and a maximum power point tracking controller of the target energy storage system;
and monitoring the real-time power of the electric cabinet and the energy storage converter until the real-time power of the electric cabinet and the energy storage converter is smaller than a first power threshold, or controlling the electric cabinet and the energy storage converter to lower high voltage until the time for starting to reduce the power of the component exceeds a third specified time so as to realize the target energy storage system to lower high voltage.
15. The method of claim 14, wherein the method further comprises:
and determining the third appointed duration according to the level of the fault of the monitored component.
16. An energy storage system, comprising: the photovoltaic module, the energy storage domain controller, the energy storage converter, the electric cabinet and the maximum power point tracking controller;
the energy storage system is configured to perform the energy storage system control method of any one of the preceding claims 1-15.
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