CN107069897B - Photovoltaic power station management system and method - Google Patents
Photovoltaic power station management system and method Download PDFInfo
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- CN107069897B CN107069897B CN201710432702.0A CN201710432702A CN107069897B CN 107069897 B CN107069897 B CN 107069897B CN 201710432702 A CN201710432702 A CN 201710432702A CN 107069897 B CN107069897 B CN 107069897B
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- 238000000034 method Methods 0.000 title claims abstract description 21
- 238000007726 management method Methods 0.000 claims description 23
- 238000010248 power generation Methods 0.000 claims description 18
- 230000009471 action Effects 0.000 description 4
- 230000005611 electricity Effects 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 241000112598 Pseudoblennius percoides Species 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 239000003245 coal Substances 0.000 description 1
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Classifications
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- H02J7/0026—
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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
- 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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- 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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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention provides a photovoltaic power station battery management system and a method, wherein the management system comprises the following components: a battery array, a coulometer, a timer, a central processing unit, and a controller; wherein each cell in the array of cells is connected to a coulombmeter; the central processing unit is respectively connected with the coulometer, the timer and the controller; the controller is connected to each of the cells in the array of cells. By applying the photovoltaic power station battery management system provided by the embodiment of the invention, the battery can be prevented from being overcharged when batteries with different capacities are charged.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic power station management system and a method.
Background
With the increasing severity of environmental pollution caused by coal power generation, clean energy is gaining more attention, and photovoltaic power generation technology is widely applied particularly with the nearly infinite advantage of sunlight. In addition, photovoltaic panels are also referred to as photovoltaic power generation panels, photovoltaic modules, and the like.
At present, the photovoltaic power generation technology mainly utilizes a photovoltaic power generation plate to generate electric energy under the action of sunlight, and meanwhile, the electric energy is stored in a battery. If a plurality of batteries are connected in series or in parallel to form a battery array, then an inverter is connected to the battery array, the battery array can be connected to a power transmission line to supply power to users.
Because the capacities of the batteries of the battery array are different, if the batteries are charged for the same time period, the batteries with lower capacities are overcharged, and if the batteries are overcharged, unexpected accidents can occur, so how to prevent the batteries from being overcharged when the batteries with different capacities are charged is a technical problem to be solved.
Disclosure of Invention
The invention aims to provide a photovoltaic power station battery management system and a photovoltaic power station battery management method, so as to achieve the purpose of preventing battery overcharge when batteries with different capacities are charged. The specific technical scheme is as follows:
to achieve the above object, an embodiment of the present invention provides a photovoltaic power station battery management system, including: a battery array, a coulometer, a timer, a central processing unit, and a controller; wherein each cell in the array of cells is connected to a coulombmeter; the central processing unit is respectively connected with the coulometer, the timer and the controller; the controller is connected with each battery in the battery array; wherein,
the battery array includes at least one battery;
the coulometer is used for measuring the current electric quantity of each battery in the battery array;
the timer is used for timing according to a first instruction sent by the central processing unit;
the central processing unit is used for judging whether the electric quantity of each battery reaches the nominal capacity of all the batteries according to the reading of the coulombmeter for each battery in the battery array; if the electric quantity of the battery reaches the nominal capacity of the battery, a second instruction is sent to the controller so that the controller disconnects the battery from the charging circuit; if the electric quantity of the battery does not reach the nominal capacity of the battery, a first instruction is sent to the timer so that the timer starts to count, and if the electric quantity of the battery does not increase within a preset time period after the timer starts, a second instruction is sent to the controller so that the controller disconnects the battery from the charging circuit;
and the controller is used for disconnecting the battery from the charging circuit under the condition of receiving a second instruction sent by the central processing unit.
Optionally, the battery array includes batteries corresponding to all photovoltaic modules in the photovoltaic power station.
Optionally, the central processing unit is specifically configured to determine, for each battery in the battery array, whether the electric quantity of the battery reaches the nominal capacity of all the batteries according to the reading of the coulomb meter in the charging period of the battery; if the electric quantity of the battery reaches the nominal capacity of the battery, a second instruction is sent to the controller so that the controller disconnects the battery from the charging circuit; and if the electric quantity of the battery does not reach the nominal capacity of the battery, sending a first instruction to the timer so as to enable the timer to start timing, and under the condition that the electric quantity of the battery is not increased within a preset time period after the timing is started, sending a second instruction to the controller so as to enable the controller to disconnect the battery from the charging circuit.
Optionally, the central processing unit is specifically configured to determine, for each battery in the battery array, whether the electric quantity of the battery reaches an average capacity of all batteries in all the battery array according to a reading of a coulomb meter in a charging period of the battery; if the electric quantity of the battery reaches the average capacity, a second instruction is sent to the controller so that the controller disconnects the battery from the charging circuit; and if the electric quantity of the battery does not reach the average capacity, sending a first instruction to the timer so as to enable the timer to start timing, and under the condition that the electric quantity of the battery is not increased within a preset time period after the timing is started, sending a second instruction to the controller so as to enable the controller to disconnect the battery from the charging circuit.
Optionally, the charging period is a period from a time when the power generation condition of the photovoltaic module is first met to a time when the power generation condition of the photovoltaic module is not last met in the day.
Optionally, the charging period is a duration between a start time preset by a user and an end time preset by the user.
In order to solve the problems in the prior art, the embodiment of the invention also provides a photovoltaic power station battery management method, which comprises the following steps:
receiving a current charge of each cell in the array of cells measured by the coulometer; the battery array includes at least one battery;
judging whether the electric quantity of each battery reaches the nominal capacity of all the batteries according to the reading of a coulombmeter for each battery in the battery array; when the electric quantity of the battery reaches the nominal capacity of the battery, a second instruction is sent to the controller so that the controller disconnects the battery from a charging circuit; if the electric quantity of the battery does not reach the nominal capacity of the battery, a first instruction is sent to the timer so that the timer starts to count;
and sending a second instruction to the controller under the condition that the electric quantity of the battery is not increased within a preset time period after the timing is started, so that the controller disconnects the battery from the charging circuit.
Optionally, the determining, for each battery in the battery array, whether the electric quantity of the battery reaches the nominal capacity of all the batteries according to the reading of the coulomb meter includes:
for each cell in the array of cells, determining whether the charge of the cell reaches the nominal capacity of all the cells based on the coulomb meter reading during the charge cycle of the cell.
Optionally, the determining, for each battery in the battery array, whether the electric quantity of the battery reaches the nominal capacity of all the batteries according to the reading of the coulomb meter includes:
for each battery in the battery array, judging whether the electric quantity of the battery reaches the average capacity of all batteries in the battery array according to the reading of a coulombmeter in the charging period of the battery.
Optionally, the charging period is a period from a time when the power generation condition of the photovoltaic module is first met to a time when the power generation condition of the photovoltaic module is not last met in the day.
The embodiment of the invention provides a photovoltaic power station battery management system and a method, wherein the management system comprises the following components: a battery array, a coulometer, a timer, a central processing unit, and a controller; wherein each cell in the array of cells is connected to a coulombmeter; the central processing unit is respectively connected with the coulometer, the timer and the controller; the controller is connected with each battery in the battery array; wherein the battery array comprises at least one battery; the coulometer is used for measuring the current electric quantity of each battery in the battery array; the timer is used for timing according to a first instruction sent by the central processing unit; the central processing unit is used for judging whether the electric quantity of each battery reaches the nominal capacity of all the batteries according to the reading of the coulombmeter for each battery in the battery array; if the electric quantity of the battery reaches the nominal capacity of the battery, a second instruction is sent to the controller so that the controller disconnects the battery from the charging circuit; if the electric quantity of the battery does not reach the nominal capacity of the battery, a first instruction is sent to the timer so that the timer starts to count, and if the electric quantity of the battery does not increase within a preset time period after the timer starts, a second instruction is sent to the controller so that the controller disconnects the battery from the charging circuit; and the controller is used for disconnecting the battery from the charging circuit under the condition of receiving a second instruction sent by the central processing unit.
By the adoption of the photovoltaic power station battery management system and the photovoltaic power station battery management method, when the electric quantity of the battery is not increased within the preset duration, the battery is disconnected from the charging circuit, and the battery can be prevented from being overcharged when the batteries with different capacities are charged. Of course, it is not necessary for any one product or method of practicing the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the embodiments of the invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a photovoltaic power station battery management system according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a photovoltaic power station battery management method according to an embodiment of the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the problems in the prior art, the embodiment of the invention provides a photovoltaic power station battery management system.
Fig. 1 is a schematic structural diagram of a photovoltaic power station battery management system according to an embodiment of the present invention, where the management system includes: a battery array (101), a coulometer (102), a timer (103), a central processing unit (104), and a controller (105); wherein each cell of the array of cells (101) is connected to a coulometer (102); the central processing unit (104) is respectively connected with the coulometer (102), the timer (103) and the controller (105); the controller (105) is connected to each cell of the array of cells (101); wherein,
the battery array (101) comprises at least one battery;
-said coulometer (102) for measuring the current charge of each cell in said array of cells (101);
the timer (103) is used for timing according to a first instruction sent by the central processing unit (104);
the central processing unit (104) is used for judging whether the electric quantity of each battery in the battery array (101) reaches the nominal capacity of all the batteries according to the reading of the coulombmeter; if the electric quantity of the battery reaches the nominal capacity of the battery, sending a second instruction to the controller (105) so as to enable the controller (105) to disconnect the battery from the charging circuit; if the electric quantity of the battery does not reach the nominal capacity of the battery, a first instruction is sent to the timer (103) so that the timer (103) starts to count, and if the electric quantity of the battery does not increase within a preset time period after the start of counting, a second instruction is sent to the controller (105) so that the controller (105) disconnects the battery from the charging circuit;
the controller (105) is used for disconnecting the battery from the charging circuit under the condition of receiving a second instruction sent by the central processing unit (104).
Optionally, in a specific implementation manner of the embodiment of the present invention, the battery array (101) includes batteries corresponding to all photovoltaic modules in the photovoltaic power station.
Optionally, in a specific implementation manner of the embodiment of the present invention, the central processing unit (104) is specifically configured to determine, for each battery in the battery array (101), whether the electric quantity of the battery reaches the nominal capacity of all the batteries according to the reading of the coulomb meter in the charging period of the battery; if the electric quantity of the battery reaches the nominal capacity of the battery, sending a second instruction to the controller (105) so as to enable the controller (105) to disconnect the battery from the charging circuit; and if the electric quantity of the battery does not reach the nominal capacity of the battery, sending a first instruction to the timer (103) so that the timer (103) starts to count, and if the electric quantity of the battery does not increase within a preset time period after counting, sending a second instruction to the controller (105) so that the controller (105) disconnects the battery from the charging circuit.
Optionally, in a specific implementation manner of the embodiment of the present invention, the central processor (104) is specifically configured to determine, for each battery in the battery array (101), whether, during a charging period of the battery, an electric quantity of the battery reaches an average capacity of all batteries in all the battery array (101) according to a reading of a coulomb meter; if the electric quantity of the battery reaches the average capacity, a second instruction is sent to the controller (105) so that the controller (105) disconnects the battery from the charging circuit; and if the electric quantity of the battery does not reach the average capacity, sending a first instruction to the timer (103) so that the timer (103) starts to count, and if the electric quantity of the battery does not increase within a preset time period after the start of counting, sending a second instruction to the controller (105) so that the controller (105) disconnects the battery from the charging circuit.
Optionally, in a specific implementation manner of the embodiment of the present invention, the charging period is a period from a time when the power generation condition of the photovoltaic module is first met to a time when the power generation condition of the photovoltaic module is not last met in the day.
For example, in a natural day, after the sun rises, the sunlight intensity is enough to enable the photovoltaic module to generate electricity at the corresponding moment, and after the afternoon sun moves below the horizon, the sunlight intensity is insufficient to enable the photovoltaic module to generate electricity at the corresponding moment; it will be appreciated that between the two times, if the intensity of the sun's light is insufficient to continue the generation of electricity by the photovoltaic module, this will not have an effect on the determination of the charging cycle.
Optionally, in a specific implementation manner of the embodiment of the present invention, the charging period is a duration between a start time preset by a user and an end time preset by the user.
Illustratively, the battery array includes a battery 1, a battery 2, a battery 3, a battery 4, and a battery 5.
Assume that the start time of the charging cycle is 08:00:00, the end time is 18:00:00, and the power of battery 1 is 1Ah, the power of battery 2 is 1Ah, the power of battery 3 is 1.4Ah, the power of battery 4 is 1.6Ah, and the power of battery 5 is 2Ah at 12:00:00.
The highest of the five batteries is 2Ah of battery 5, so battery 1, battery 2, battery 3 and battery 4 do not reach 2Ah, and thus the central processor (104) sends a first instruction to the timer (103) for each of battery 1, battery 2, battery 3 and battery 4. The timer (103) counts time for each of the battery 1, the battery 2, the battery 3, and the battery 4 after receiving the first instruction. The preset duration is 10 minutes, if the electric quantity of the battery 1 is not increased within the duration of 12:00:00 to 12:10:00, which indicates that the battery 1 is full and charging is not needed to be continued, and therefore the central processor (104) sends a second instruction to the timer (103). After the timer (103) receives the second instruction, the connection between the charging circuit and the battery 1 is cut off.
In practical applications, it may be determined that the battery 1 is full, if the power of the other battery continues to increase, and the power of the battery 1 does not increase.
By applying the photovoltaic power station battery management system provided by the embodiment of the invention shown in the figure 1, when the electric quantity of the battery is not increased within the preset duration, the connection between the battery and the charging circuit is disconnected, so that the battery can be prevented from being overcharged when the batteries with different capacities are charged.
Corresponding to the embodiment shown in fig. 1 of the present invention, the embodiment of the present invention further provides a method for managing the battery of the photovoltaic power station.
Fig. 2 is a schematic flow chart of a method for managing a photovoltaic power station battery according to an embodiment of the present invention, as shown in fig. 2, where the method includes:
s101: receiving a current charge of each cell in the array of cells measured by the coulometer; the battery array includes at least one battery;
s102: judging whether the electric quantity of each battery reaches the nominal capacity of all the batteries according to the reading of a coulombmeter for each battery in the battery array; when the electric quantity of the battery reaches the nominal capacity of the battery, a second instruction is sent to the controller so that the controller disconnects the battery from a charging circuit; if the electric quantity of the battery does not reach the nominal capacity of the battery, a first instruction is sent to the timer so that the timer starts to count;
s103: and sending a second instruction to the controller under the condition that the electric quantity of the battery is not increased within a preset time period after the timing is started, so that the controller disconnects the battery from the charging circuit.
Optionally, in a specific implementation manner of the embodiment of the present invention, for each battery in the battery array, determining, according to a reading of a coulomb meter, whether the electric quantity of the battery reaches the nominal capacity of all the batteries includes:
for each cell in the array of cells, determining whether the charge of the cell reaches the nominal capacity of all the cells based on the coulomb meter reading during the charge cycle of the cell.
Optionally, in a specific implementation manner of the embodiment of the present invention, for each battery in the battery array, determining, according to a reading of a coulomb meter, whether the electric quantity of the battery reaches the nominal capacity of all the batteries includes:
for each battery in the battery array, judging whether the electric quantity of the battery reaches the average capacity of all batteries in the battery array according to the reading of a coulombmeter in the charging period of the battery.
Optionally, in a specific implementation manner of the embodiment of the present invention, the charging period is a period from a time when the power generation condition of the photovoltaic module is first met to a time when the power generation condition of the photovoltaic module is not last met in the day.
By applying the battery management method of the photovoltaic power station provided by the embodiment of the invention shown in the figure 2, when the electric quantity of the battery is not increased within the preset duration, the connection between the battery and the charging circuit is disconnected, so that the battery can be prevented from being overcharged when the batteries with different capacities are charged.
It is noted that relational terms such as first and second, and the like are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
In this specification, each embodiment is described in a related manner, and identical and similar parts of each embodiment are all referred to each other, and each embodiment mainly describes differences from other embodiments. In particular, for system embodiments, since they are substantially similar to method embodiments, the description is relatively simple, as relevant to see a section of the description of method embodiments.
The foregoing description is only of the preferred embodiments of the present invention and is not intended to limit the scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention are included in the protection scope of the present invention.
Claims (7)
1. A photovoltaic power plant battery management system, the management system comprising: a battery array (101), a coulometer (102), a timer (103), a central processing unit (104), and a controller (105); wherein each cell of the array of cells (101) is connected to a coulometer (102); the central processing unit (104) is respectively connected with the coulometer (102), the timer (103) and the controller (105); the controller (105) is connected to each cell of the array of cells (101); wherein,
the battery array (101) comprises at least one battery;
-said coulometer (102) for measuring the current charge of each cell in said array of cells (101);
the timer (103) is used for timing according to a first instruction sent by the central processing unit (104);
the controller (105) is used for disconnecting the battery from the charging circuit under the condition of receiving a second instruction sent by the central processing unit (104);
the central processing unit (104) is specifically configured to determine, for each battery in the battery array (101), whether the electric quantity of the battery reaches the nominal capacity of all the batteries according to the reading of the coulomb meter in the charging period of the battery; if the electric quantity of the battery reaches the nominal capacity of the battery, sending a second instruction to the controller (105) so as to enable the controller (105) to disconnect the battery from the charging circuit; if the electric quantity of the battery does not reach the nominal capacity of the battery, a first instruction is sent to the timer (103) so that the timer (103) starts to count, and if the electric quantity of the battery does not increase within a preset time period after the start of counting, a second instruction is sent to the controller (105) so that the controller (105) disconnects the battery from the charging circuit;
the central processing unit (104) is specifically configured to determine, for each battery in the battery array (101), whether the electric quantity of the battery reaches the average capacity of all the batteries in all the battery array (101) according to the reading of the coulomb meter in the charging period of the battery; if the electric quantity of the battery reaches the average capacity, a second instruction is sent to the controller (105) so that the controller (105) disconnects the battery from the charging circuit; if the electric quantity of the battery does not reach the average capacity, a first instruction is sent to the timer (103) so that the timer (103) starts to count, and if the electric quantity of the battery does not increase within a preset time period after the start of counting, a second instruction is sent to the controller (105) so that the controller (105) disconnects the battery from the charging circuit;
the charging period is a duration from a starting time preset by a user to an ending time preset by the user.
2. The photovoltaic power plant cell management system according to claim 1, characterized in that the cell array (101) comprises cells corresponding to all photovoltaic modules in the photovoltaic power plant.
3. The photovoltaic power plant battery management system of claim 1, wherein the charging period is a period of time between a time of day when the photovoltaic module power generation condition is first met and a time of day when the photovoltaic module power generation condition is last not met.
4. A management method for a photovoltaic power plant cell management system according to any one of claims 1-3, characterized in that the method comprises:
receiving a current charge of each cell in the array of cells measured by the coulometer; the battery array includes at least one battery;
judging whether the electric quantity of each battery reaches the nominal capacity of all the batteries according to the reading of a coulombmeter for each battery in the battery array; when the electric quantity of the battery reaches the nominal capacity of the battery, a second instruction is sent to the controller so that the controller disconnects the battery from a charging circuit; if the electric quantity of the battery does not reach the nominal capacity of the battery, a first instruction is sent to the timer so that the timer starts to count;
and sending a second instruction to the controller under the condition that the electric quantity of the battery is not increased within a preset time period after the timing is started, so that the controller disconnects the battery from the charging circuit.
5. The method of claim 4, wherein for each cell in the array of cells, determining from the coulomb meter reading whether the charge of the cell reaches the nominal capacity of all of the cells comprises:
for each cell in the array of cells, determining whether the charge of the cell reaches the nominal capacity of all the cells based on the coulomb meter reading during the charge cycle of the cell.
6. The method of claim 5, wherein for each cell in the array of cells, determining from the coulomb meter reading whether the charge of the cell reaches the nominal capacity of all of the cells comprises:
for each battery in the battery array, judging whether the electric quantity of the battery reaches the average capacity of all batteries in the battery array according to the reading of a coulombmeter in the charging period of the battery.
7. The method of claim 6, wherein the charging period is a period of time between a time of day when the power generation condition of the photovoltaic module is first satisfied and a time of day when the power generation condition of the photovoltaic module is last not satisfied.
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| CN110456282A (en) * | 2019-06-30 | 2019-11-15 | 安徽宇艳智能机械科技有限公司 | A kind of battery check device used suitable for mine narrow gauge electric car |
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