CN114465260B - Control method for balancing photovoltaic energy storage battery - Google Patents
Control method for balancing photovoltaic energy storage battery Download PDFInfo
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- CN114465260B CN114465260B CN202210363018.2A CN202210363018A CN114465260B CN 114465260 B CN114465260 B CN 114465260B CN 202210363018 A CN202210363018 A CN 202210363018A CN 114465260 B CN114465260 B CN 114465260B
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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
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/44—Methods for charging or discharging
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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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
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00302—Overcharge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00306—Overdischarge protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0047—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with monitoring or indicating devices or circuits
- H02J7/0048—Detection of remaining charge capacity or state of charge [SOC]
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/007—Regulation of charging or discharging current or voltage
- H02J7/00712—Regulation of charging or discharging current or voltage the cycle being controlled or terminated in response to electric parameters
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/34—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering
- H02J7/35—Parallel operation in networks using both storage and other dc sources, e.g. providing buffering with light sensitive cells
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/42—Methods or arrangements for servicing or maintenance of secondary cells or secondary half-cells
- H01M10/425—Structural combination with electronic components, e.g. electronic circuits integrated to the outside of the casing
- H01M2010/4271—Battery management systems including electronic circuits, e.g. control of current or voltage to keep battery in healthy state, cell balancing
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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
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- Y—GENERAL 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Manufacturing & Machinery (AREA)
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a control method for balancing a photovoltaic energy storage battery, wherein the method comprises the following steps: collecting photovoltaic grid-connected power; determining photovoltaic output fluctuation rate based on the photovoltaic grid-connected power; comparing the photovoltaic output fluctuation rate with a preset limit value to obtain a first comparison result of the photovoltaic output fluctuation rate and the preset limit value; the battery charging mode is controlled based on the first comparison result, and the battery is charged by using different modes under different conditions, so that the problem of battery equalization can be solved on the basis of smooth photovoltaic power generation output, and the service life of the battery is prolonged.
Description
Technical Field
The invention relates to the field of new energy, in particular to a control method for balancing a photovoltaic energy storage battery.
Background
With the increase of photovoltaic power generation, the defects are gradually exposed in the use process. Moreover, after the utilization and popularization of renewable energy sources are increasingly restricted by factors such as large fluctuation of power output of the photovoltaic power generation system, configuration of energy storage in the grid-connected photovoltaic power generation system becomes one of the research directions of large-scale energy storage systems at present.
An energy storage system configuration mode aiming at smoothing photovoltaic power generation output generally configures a centralized energy storage system at a photovoltaic power generation side, and the existing research has proposed a hybrid energy storage system adopting a storage battery and a super capacitor and further proposed a control method for stabilizing the output power of wind power generation by using the hybrid energy storage system. The control method overcomes the defects of the energy storage device when the energy storage device is used alone to a certain extent, considers the requirement of power grid dispatching in the compensation process, and can well restrain the output power of the wind power generation system.
However, in the prior art, the problems that the battery is overcharged and overdischarged due to manufacturing deviation, abnormal charging and discharging working conditions and the like of an energy storage unit consisting of a storage battery pack and a super capacitor in a hybrid energy storage system, and the service life of the battery is shortened are not considered.
Disclosure of Invention
Therefore, the technical problem to be solved by the present invention is to overcome the problem of the prior art that the service life of the battery is shortened due to overcharge and overdischarge of the battery, thereby providing a control method for balancing a photovoltaic energy storage battery.
The invention provides a control method for balancing photovoltaic energy storage cells, which comprises the following steps: collecting photovoltaic grid-connected power; determining photovoltaic output fluctuation rate based on photovoltaic grid-connected power; comparing the photovoltaic output fluctuation rate with a preset limit value to obtain a first comparison result of the photovoltaic output fluctuation rate and the preset limit value; the battery charging mode is controlled based on the first comparison result.
The invention provides a control method for balancing photovoltaic energy storage cells, which further comprises the following steps: acquiring energy storage enabling state information, photovoltaic output information, adjustable margin information and current grid-connected power; determining an energy storage actual output value according to the energy storage enabling state information, the photovoltaic output information, the adjustable margin information and the current grid-connected power; and regulating the photovoltaic power generation output according to the actual output value of the stored energy if the photovoltaic output fluctuation rate is greater than or equal to the preset limit value according to the first comparison result.
Optionally, determining an actual output value of the energy storage according to the energy storage enabling state information, the photovoltaic output information, the adjustable margin information and the current grid-connected power, and including: when the energy storage enabling state information indicates that the energy storage unit can be used for outputting photovoltaic energy, determining a current energy storage output target value based on the photovoltaic output information; according to the photovoltaic output information and the current grid-connected power, determining a smoothing mode of the energy storage unit on the photovoltaic output; and determining an actual energy storage output value based on the current energy storage output target value and the adjustable margin information according to the smoothing mode of the energy storage unit on the photovoltaic output.
Optionally, adjusting the photovoltaic power generation output according to the actual output value of the stored energy includes: and smoothing the power of the photovoltaic power generation output according to the actual output value of the stored energy to enable the photovoltaic output power to reach the target output power.
Optionally, controlling the mode of charging the battery based on the first comparison result includes: charging the battery by using the generator if the photovoltaic output fluctuation rate is greater than or equal to a preset limit value according to the first comparison result; comparing the photovoltaic output power with the target output power to obtain a second comparison result of the photovoltaic output power and the target output power if the photovoltaic output fluctuation rate is smaller than the preset limit value according to the first comparison result; charging the battery with the photovoltaic or the motor based on the second comparison result.
Optionally, determining a charging mode of the battery based on the second comparison result, wherein the charging mode includes charging the battery with the photovoltaic or/and the engine, comprising: according to the second comparison result, if the photovoltaic output power is larger than the target output power, comparing the photovoltaic output margin with the electric quantity required to be supplemented by the battery unit to obtain a third comparison result of the photovoltaic output margin and the electric quantity required to be supplemented by the battery unit, and determining the charging mode of the battery to be charging the battery by utilizing the photovoltaic or charging the battery by utilizing the photovoltaic and the generator based on the third comparison result; and charging the battery by using the generator if the photovoltaic output power is less than or equal to the target output power according to the second comparison result.
Optionally, charging the battery with a photovoltaic or charging the battery with a photovoltaic and a generator, comprising: collecting battery unit information, wherein the battery unit information comprises the electric quantity of a battery unit, and the battery comprises a plurality of battery units; comparing the electric quantity of the battery unit with a preset electric quantity, and judging whether the electric quantity of the battery unit is lower than the preset electric quantity; when the electric quantity of the battery unit is lower than the preset electric quantity, calculating the electric quantity required to be supplemented by the battery unit, wherein the electric quantity required to be supplemented by the battery unit is the difference value of the electric quantity of the battery unit and the preset electric quantity; if the photovoltaic output surplus electric quantity is larger than or equal to the electric quantity required to be supplemented by the battery unit according to the third comparison result, charging the battery unit by utilizing the photovoltaic; and calculating the difference value between the electricity quantity needed to be supplemented by the battery unit and the photovoltaic surplus electricity quantity according to the third comparison result when the photovoltaic surplus electricity quantity is smaller than the electricity quantity needed to be supplemented by the battery unit, and charging the battery unit by utilizing the photovoltaic and the generator.
Optionally, charging the battery with a generator, comprising: collecting battery unit information, wherein the battery unit information comprises the electric quantity of a battery unit, and the battery comprises a plurality of battery units; comparing the electric quantity of the battery unit with a preset electric quantity, and judging whether the electric quantity of the battery unit is lower than the preset electric quantity; and when the electric quantity of the battery unit is lower than the preset electric quantity, the battery is charged by using the generator.
The present invention provides a computer device comprising: the control system comprises a memory and a processor, wherein the memory and the processor are mutually connected in a communication way, the memory is used for storing a computer program, and the computer program is executed by the processor to enable the processor to execute the control method in any embodiment of the invention.
The invention provides a computer-readable storage medium, which is characterized by being used for storing computer instructions and realizing a control method in any embodiment of the invention when the computer instructions are executed by a processor.
In the embodiment of the invention, the photovoltaic grid-connected power is acquired; determining photovoltaic output fluctuation rate based on photovoltaic grid-connected power; comparing the photovoltaic output fluctuation rate with a preset limit value to obtain a first comparison result of the photovoltaic output fluctuation rate and the preset limit value; controlling a battery charging mode based on the first comparison result; the battery unit can always keep a certain electric quantity, the problem that the service life of the battery is shortened due to overcharge and overdischarge of the battery is solved, and the service life of the battery is prolonged.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a method for balancing and controlling a photovoltaic energy storage cell according to an embodiment of the present invention.
Fig. 2 is a flowchart of battery equalization control according to an embodiment of the present invention.
Fig. 3 is a flowchart of smooth control of output power of photovoltaic power generation according to an embodiment of the present invention.
Fig. 4 is a calculation flowchart of determining an actual output value of stored energy according to an embodiment of the present invention.
Fig. 5 is a control flow chart of charging a battery using photovoltaic power according to an embodiment of the present invention.
Fig. 6 is a control flow chart of charging a battery by using a photovoltaic device and a generator according to an embodiment of the present invention.
Fig. 7 is a control flow chart of charging a battery by using a generator according to an embodiment of the present invention.
Fig. 8 is a schematic diagram of a computer device according to an embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, belong to the protection scope of the present invention.
The embodiment provides a control method for solving the problems of cell equalization and smooth photovoltaic power generation output, as shown in fig. 1, the method comprises the following steps:
step S1: collecting photovoltaic grid-connected power, wherein the photovoltaic grid-connected power refers to the power of a power transmission line of a generator set when the power transmission line is connected with a power transmission network, and the collected photovoltaic grid-connected power comprises the photovoltaic grid-connected power at the current moment and the last moment;
step S2: the photovoltaic output fluctuation rate is determined based on the photovoltaic grid-connected power, the photovoltaic output fluctuation rate is obtained through calculation of grid-connected power difference values at two adjacent sampling moments and the photovoltaic rated installed capacity, and the formula is as follows:
wherein
The photovoltaic output fluctuation rate is represented by,
representing the difference value of the photovoltaic grid-connected power at two adjacent sampling moments,
representing the photovoltaic rated installed capacity.
Step S3: comparing the photovoltaic output fluctuation rate with a preset limit value to obtain a first comparison result of the photovoltaic output fluctuation rate and the preset limit value;
step S4: controlling a battery charging mode based on the first comparison result, and charging the battery by using the generator if the first comparison result indicates that the photovoltaic output fluctuation rate is greater than or equal to a preset limit value; and if the first comparison result is that the photovoltaic output fluctuation rate is smaller than the preset limit value, comparing the photovoltaic output power with the target output power to obtain a second comparison result of the photovoltaic output power and the target output power.
If the second comparison result is that the photovoltaic output power is less than or equal to the target output power, the battery is charged by the generator; if the second comparison result is that the photovoltaic output power is larger than the target output power, the photovoltaic output is margin-added
The difference value between the current quantity of the battery unit and the preset quantity of the battery unit when the battery unit needs to be supplemented with the electric quantity
Comparing to obtain the photovoltaic output margin
And the battery unit needs to be supplemented with electric quantity
And determining whether to charge the battery using the photovoltaic or the photovoltaic and the generator based on the third comparison result.
If the third comparison result shows that the surplus electric quantity of the photovoltaic output is greater than or equal to the electric quantity of the battery unit and the electric quantity needs to be supplemented
Charging the battery unit by utilizing the photovoltaic;
according to the third comparison result, the photovoltaic output surplus electric quantity is smaller than the electric quantity of the battery unit, and the electric quantity needs to be supplemented
And calculating the difference value between the electric quantity required to be supplemented by the battery unit and the surplus electric quantity of the photovoltaic output, and charging the battery unit by utilizing the photovoltaic and the generator.
According to the control method for balancing the photovoltaic energy storage battery, the battery is charged through the photovoltaic and the generator, the problem that energy is unevenly distributed among the energy storage units is solved, the service life of the battery is prolonged, the photovoltaic power quality is improved, energy is saved, and the photovoltaic absorption capacity is improved; a specific battery equalization control strategy is shown in fig. 2.
Preferably, in step S3, when the first comparison result is that the photovoltaic output fluctuation ratio is greater than or equal to a preset limit, the result further includes: the control flow for smoothing the photovoltaic power generation output power according to the actual energy storage output value to make the photovoltaic output power reach the target output power, and specifically, smoothing the photovoltaic power generation output power is shown in fig. 3.
Specifically, the power smoothing is performed on the photovoltaic power generation output according to the actual output value of the stored energy, so that the photovoltaic output power reaches the target output power, and the method comprises the following steps: acquiring energy storage enabling state information, photovoltaic output information, adjustable margin information and current grid-connected power; determining an actual energy storage output value according to the energy storage enabling state information, the photovoltaic output information, the adjustable margin information and the current grid-connected power; the controller issues the actual Energy storage output value to an Energy Management System (EMS), and the EMS smoothes the power of the photovoltaic power generation output to reach a target output power value.
Specifically, determining the actual output value of the stored energy according to the stored energy enabling state information, the photovoltaic output information, the adjustable margin information and the current grid-connected power comprises: judging whether the energy storage unit can enable the photovoltaic output or not based on the energy storage enabling state information, if so, smoothing the photovoltaic output by using the energy storage unit, and if not, not performing photovoltaic smoothing operation; and calculating the current energy storage output target value based on the photovoltaic output information. Obtaining the maximum chargeable power value or the maximum amplifiable power value based on the adjustable margin information; firstly, under the condition that an energy storage unit can smooth a photovoltaic, combining photovoltaic output information, calculating a current energy storage output target value by using a low-pass filtering algorithm, namely decomposing current photovoltaic grid-connected power and the current energy storage output target value by using the low-pass filtering algorithm; then, judging the current photovoltaic output power and the current photovoltaic grid-connected power, if the current photovoltaic output power is larger than the current photovoltaic grid-connected power, storing the current photovoltaic output margin (which is equivalent to smoothing photovoltaic output by charging the energy storage unit) by the energy storage unit, further judging the current energy storage output target value and the maximum chargeable power value, and if the current energy storage output target value is larger than the maximum chargeable power value, judging that the actual energy storage output value is equal to the maximum chargeable power value; if the current energy storage output target value is smaller than the maximum chargeable active value, the actual energy storage output value is equal to the current energy storage output target value; if the current photovoltaic output power is smaller than the current photovoltaic grid-connected power, the energy storage unit is required to discharge to compensate the difference value between the current photovoltaic grid-connected power and the current photovoltaic output power (namely, the photovoltaic output is smoothed through the discharge of the energy storage unit), at the moment, the current energy storage output target value and the maximum amplifiable value are further judged, and if the current energy storage output target value is larger than the maximum amplifiable value, the actual energy storage output value is equal to the maximum amplifiable value; if the current energy storage output target value is less than the maximum releasable power value, the actual energy storage output value is equal to the current energy storage output target value; the specific process of determining the actual energy storage output value is shown in fig. 4, and finally, smoothing of photovoltaic output is achieved through charging or discharging of the energy storage unit, so that photovoltaic output power meets grid connection requirements, and volatility caused by photovoltaic grid connection is reduced.
Preferably, in step S4, charging the battery cell using photovoltaic power includes: collecting battery unit information; comparing the electric quantity of the battery unit with a preset electric quantity, and judging whether the electric quantity of the battery unit is lower than the preset electric quantity; when the electric quantity of the battery unit is lower than the preset electric quantity, calculating the electric quantity to be supplemented by the battery unit, namely the difference value between the electric quantity of the battery unit and the preset electric quantity; make photovoltaic output surplus electric quantity
And the battery unit needs to be supplemented with electric quantity
Comparing to obtain the surplus electric quantity of the photovoltaic output
And the battery unit needs to be supplemented with electric quantity
Based on the third comparison result, judging whether the switching circuit is controlled to charge the battery by utilizing the photovoltaic or charge the battery by utilizing the photovoltaic and the generator; if the third comparison result indicates that the photovoltaic output surplus electric quantity is greater than or equal to the electric quantity required to be supplemented by the battery unit (
) If the battery capacity is larger than or equal to the preset capacity, the controller controls the switching circuit to stop charging the battery unitCharging; the control flow of charging the battery by using photovoltaic is shown in fig. 5.
Preferably, in step S4, charging the battery unit with the photovoltaic and the generator includes: collecting battery unit information; comparing the electric quantity of the battery unit with a preset electric quantity, and judging whether the electric quantity of the battery unit is lower than the preset electric quantity; when the electric quantity of the battery unit is lower than the preset electric quantity, calculating the electric quantity which needs to be supplemented by the battery unit, namely the difference value between the electric quantity of the battery unit and the preset electric quantity; make photovoltaic output surplus electric quantity 
And the battery unit needs to be supplemented with electric quantity
Comparing to obtain the surplus electric quantity of the photovoltaic output
And the battery unit needs to be supplemented with electric quantity
Based on the third comparison result, judging whether the switching circuit is controlled to charge the battery by utilizing the photovoltaic or charge the battery by utilizing the photovoltaic and the generator; if the third comparison result shows that the photovoltaic power surplus electric quantity is less than the electric quantity to be supplemented by the battery unit (
) If the battery power is larger than or equal to the preset power, the controller controls the switching circuit to finish charging the battery unit; the control flow of charging the battery with the photovoltaic and the generator is shown in fig. 6.
Preferably, in step S4, the charging the battery with the generator includes: collecting battery unit information, wherein the battery unit is a battery unit; comparing the electric quantity of the battery unit with a preset electric quantity, and judging whether the electric quantity of the battery unit is lower than the preset electric quantity; when the electric quantity of the battery unit is lower than the preset electric quantity, the controller controls the switching circuit to charge the battery by using the generator, and when the electric quantity of the battery is larger than or equal to the preset electric quantity, the controller controls the switching circuit to finish charging the battery unit; fig. 7 shows a control flow of charging the battery with the generator.
The present embodiment provides a computer device, as shown in fig. 8, the computer device may include at least one processor 41, at least one communication interface 42, at least one communication bus 43, and at least one memory 44, where the communication interface 42 may include a Display screen (Display) and a Keyboard (Keyboard), and the optional communication interface 42 may also include a standard wired interface and a standard wireless interface. The Memory 44 may be a Random Access Memory (RAM) or a non-volatile Memory (non-volatile Memory), such as at least one disk Memory. The memory 44 may alternatively be at least one memory device located remotely from the aforementioned processor 41. Wherein the processor 41 may be combined with the apparatus described in fig. 8, the memory 44 stores an application program, and the processor 41 calls the program code stored in the memory 44 for executing the control steps of the balancing of the photovoltaic energy storage cell of any of the above-mentioned method embodiments.
The communication bus 43 may be a Peripheral Component Interconnect (PCI) bus, an Extended Industry Standard Architecture (EISA) bus, or the like. The communication bus 43 may be divided into an address bus, a data bus, a control bus, etc. For ease of illustration, only one thick line is shown in FIG. 8, but this is not intended to represent only one bus or type of bus.
The memory 44 may include a volatile memory (RAM), such as a random-access memory (RAM); the memory may also include a non-volatile memory (such as a flash memory), a hard disk (HDD) or a solid-state drive (SSD); the memory 44 may also comprise a combination of the above kinds of memories.
The processor 41 may be a Central Processing Unit (CPU), a Network Processor (NP), or a combination of a CPU and an NP.
The processor 41 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a Programmable Logic Device (PLD), or a combination thereof. The PLD may be a Complex Programmable Logic Device (CPLD), a field-programmable gate array (FPGA), General Array Logic (GAL), or any combination thereof. Optionally, the memory 44 is also used to store program instructions. The processor 41 may call a program instruction to implement the control method for balancing the photovoltaic energy storage battery in any embodiment of the present invention.
The present embodiment provides a computer-readable storage medium, where computer-executable instructions are stored, where the computer-executable instructions may execute the method for controlling the balancing of the photovoltaic energy storage cell in any of the method embodiments described above. The storage medium may be a magnetic Disk, an optical Disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a Hard Disk (Hard Disk Drive, abbreviated as HDD) or a Solid State Drive (SSD), etc.; the storage medium may also comprise a combination of memories of the kind described above.
It is to be understood that the above examples are illustrative only for the purpose of clarity of description and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (7)
1. A control method for balancing a photovoltaic energy storage battery is characterized by comprising the following steps:
Collecting photovoltaic grid-connected power;
determining photovoltaic output fluctuation rate based on the photovoltaic grid-connected power;
comparing the photovoltaic output fluctuation rate with a preset limit value to obtain a first comparison result of the photovoltaic output fluctuation rate and the preset limit value;
controlling a battery charging mode based on the first comparison result;
the controlling of the mode of charging the battery based on the first comparison result includes:
when the first comparison result shows that the photovoltaic output fluctuation rate is greater than or equal to the preset limit value, a generator is used for charging a battery;
when the first comparison result is that the photovoltaic output fluctuation rate is smaller than the preset limit value, comparing the photovoltaic output power with the target output power to obtain a second comparison result of the photovoltaic output power and the target output power;
determining a charging mode of the battery based on the second comparison result, wherein the charging mode comprises charging the battery by utilizing the photovoltaic or/and the engine;
the determining a charging mode of the battery based on the second comparison result includes:
when the second comparison result is that the photovoltaic output power is larger than the target output power, comparing the photovoltaic output margin with the electric quantity required to be supplemented by the battery unit to obtain a third comparison result of the photovoltaic output margin and the electric quantity required to be supplemented by the battery unit;
Determining a charging mode of the battery to be charging the battery with the photovoltaic or charging the battery with the photovoltaic and the generator based on a third comparison result;
when the second comparison result is that the photovoltaic output power is smaller than or equal to the target output power, determining that the charging mode of the battery is to charge the battery by using a generator;
the charging of the battery by the photovoltaic or the charging of the battery by the photovoltaic and the generator comprises the following steps:
collecting battery unit information, wherein the battery unit information comprises the electric quantity of a battery unit, and a battery comprises a plurality of battery units;
comparing the electric quantity of the battery unit with a preset electric quantity, and judging whether the electric quantity of the battery unit is lower than the preset electric quantity;
when the electric quantity of the battery unit is lower than the preset electric quantity, calculating the electric quantity required to be supplemented by the battery unit, wherein the electric quantity required to be supplemented by the battery unit is the difference value between the electric quantity of the battery unit and the preset electric quantity;
when the third comparison result shows that the photovoltaic output surplus electric quantity is larger than or equal to the electric quantity required to be supplemented by the battery unit, charging the battery unit by utilizing photovoltaic;
and when the third comparison result shows that the photovoltaic output surplus electric quantity is smaller than the electric quantity to be supplemented by the battery unit, calculating a difference value between the electric quantity to be supplemented by the battery unit and the photovoltaic output surplus electric quantity, and charging the battery unit by utilizing the photovoltaic and the generator.
2. The control method according to claim 1, characterized by further comprising:
acquiring energy storage enabling state information, photovoltaic output information, adjustable margin information and current grid-connected power;
determining an actual output value of the stored energy according to the stored energy enabling state information, the photovoltaic output information, the adjustable margin information and the current grid-connected power;
and when the first comparison result shows that the fluctuation rate of the photovoltaic output is greater than or equal to a preset limit value, regulating the photovoltaic power generation output according to the actual output value of the stored energy.
3. The control method according to claim 2, wherein the determining an actual output value of stored energy according to the stored energy enabled state information, the photovoltaic output information, the adjustable margin information, and the current grid-connected power comprises:
when the energy storage enabling state information indicates that the energy storage unit can be photovoltaic output enabling, determining a current energy storage output target value based on the photovoltaic output information;
determining a smoothing mode of the energy storage unit for photovoltaic output according to the photovoltaic output information and the current grid-connected power;
and determining an actual energy storage output value according to the smoothing mode of the energy storage unit on the photovoltaic output, the current energy storage output target value and the adjustable margin information.
4. The control method according to claim 2, wherein the adjusting the photovoltaic power generation output according to the actual energy storage output value comprises:
and smoothing the power of the photovoltaic power generation output according to the energy storage actual output value to enable the photovoltaic output power to reach the target output power.
5. The control method according to claim 1, wherein the charging the battery with the generator includes:
collecting battery unit information, wherein the battery unit information comprises the electric quantity of a battery unit, and a battery comprises a plurality of battery units;
comparing the electric quantity of the battery unit with a preset electric quantity, and judging whether the electric quantity of the battery unit is lower than the preset electric quantity;
and when the electric quantity of the battery unit is lower than the preset electric quantity, the battery is charged by using the generator.
6. A computer device, comprising: a memory and a processor, communicatively connected to each other, the memory for storing a computer program which, when executed by the processor, causes the processor to carry out the control method according to any one of claims 1 to 5.
7. A computer-readable storage medium for storing computer instructions which, when executed by a processor, implement a control method as claimed in any one of claims 1 to 5.
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| US20160233679A1 (en) | 2013-10-18 | 2016-08-11 | State Grid Corporation Of China | A method and system for control of smoothing the energy storage in wind phtovolatic power fluctuation based on changing rate |
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