CN115714448A - Charging device and charging control method - Google Patents
Charging device and charging control method Download PDFInfo
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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
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- 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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- 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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
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- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
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Abstract
The application provides a charging device and a charging control method, and relates to the technical field of charging. The method comprises the following steps: the system comprises a maximum power point tracking module, a first electric energy conversion module and a charging control module; the at least one light energy generating device is electrically connected with the maximum power point tracking module and is used for transmitting electric energy obtained by adopting light conversion to the maximum power point tracking module; the maximum power point tracking module is electrically connected with the first electric energy conversion module and used for tracking the maximum current and voltage value of the electric energy, and if the maximum power of the electric energy is larger than or equal to the preset load power, the electric energy is output to the first electric energy conversion module by adopting the maximum power; the first electric energy conversion module is electrically connected with the charging control module to convert the first direct-current voltage of the electric energy into a second direct-current voltage, so that the charging control module charges the load according to the second direct-current voltage. The electric energy is converted only once without frequent conversion, so that the loss of the electric energy in the conversion process is reduced, and the utilization rate of the electric energy is improved.
Description
Technical Field
The present disclosure relates to the field of charging technologies, and in particular, to a charging device and a charging control method.
Background
Solar energy has advantages such as universality, innocuity, reserves are big, use for a long time, converts solar energy into electric energy and can practice thrift the electric wire netting power consumption, along with electric automobile's popularization, becomes more and more important with solar energy conversion electric energy in order to satisfy electric automobile's electric energy demand.
In the related art, the direct current generated by photovoltaic power generation is transmitted to the commercial power, and the commercial power is adopted to charge the electric automobile. Specifically, the direct current generated by photovoltaic power generation is sequentially converted into direct current (AC) and direct current (DC/DC) through a DC/DC converter and a DC/AC converter of a grid-connected inverter and an AC/DC converter and a DC/DC converter of an On-board charger of an On-board battery charger, so as to charge the electric vehicle.
However, in the related art, the direct current generated by the photovoltaic power generation needs to be converted into the alternating current through the inverter, and then the converted alternating current is converted into the direct current again through the vehicle-mounted charging device to charge the electric vehicle, so that the current needs to be frequently converted, and the utilization rate of the electric energy is reduced.
Disclosure of Invention
An object of the present invention is to provide a charging device and a charging control method, so as to solve the above technical problems in the related art.
In order to achieve the above purpose, the embodiments of the present application adopt the following technical solutions:
in a first aspect, an embodiment of the present application provides a charging device, including: the system comprises a maximum power point tracking module, a first electric energy conversion module and a charging control module;
at least one optical energy generating device is electrically connected with the maximum power point tracking module and is used for transmitting electric energy obtained by adopting light conversion to the maximum power point tracking module;
the maximum power point tracking module is electrically connected with the first electric energy conversion module and is used for tracking the maximum current and voltage value of the electric energy, and if the maximum power of the electric energy is greater than or equal to the preset load power, the maximum power is adopted to output the electric energy to the first electric energy conversion module;
the first electric energy conversion module is electrically connected with the charging control module to convert the first direct-current voltage of the electric energy into a second direct-current voltage, so that the charging control module charges a load according to the second direct-current voltage.
Optionally, the method further includes: a second electric energy conversion module;
the second electric energy conversion module is respectively electrically connected with the maximum power point tracking module and the energy storage battery, and is used for converting the first direct-current voltage of the electric energy output by the maximum power point tracking module into a third direct-current voltage and charging the energy storage battery according to the third direct-current voltage.
Optionally, the method further includes: the inverter module and the controller;
the controller is respectively in communication connection with the inversion module, the maximum power point tracking module and the second electric energy conversion module, and the inversion module is electrically connected with the charging control module;
the controller is used for controlling the maximum power point tracking module to transmit the electric energy to the inversion module when the second electric energy conversion module indicates that the energy storage battery is fully charged; and the inversion module is used for converting the alternating current output by the power grid into direct current and transmitting the direct current to a load through the charging control module.
Optionally, the controller is further in communication connection with the first electric energy conversion module, and the first electric energy conversion module is electrically connected with the second electric energy conversion module;
the maximum power point tracking module is used for acquiring light intensity information sent by the at least one light energy power generation device and sending the light intensity information to the controller;
the controller is configured to obtain the generated power of the at least one light energy power generation device through the maximum power point tracking module according to the light intensity information, and control the second electric energy conversion module to output the electric energy in the energy storage battery to the first electric energy conversion module and/or control the inverter module to output the electric energy in the power grid to the first electric energy conversion module according to the generated power, the preset load power and the battery power.
Optionally, the inversion module is an inversion grid-connected module or an inversion grid-connected module.
In a second aspect, an embodiment of the present application provides a charging control method applied to the charging device of any one of the first aspects, where the method includes:
at least one optical energy power generation device adopts electric energy obtained by light conversion and transmits the electric energy to a maximum power point tracking module;
the maximum power point tracking module acquires the electric energy transmitted by the at least one optical energy power generation device, tracks the maximum current and voltage value of the electric energy, and outputs the electric energy to the first electric energy conversion module by adopting the maximum power if the maximum power of the electric energy is greater than or equal to a preset load power;
the first electric energy conversion module converts the first direct-current voltage of the electric energy into a second direct-current voltage and outputs the second direct-current voltage through the charging control module;
the charging control module charges a load according to the second direct-current voltage.
Optionally, the maximum power point tracking module obtains the electric energy transmitted by the at least one optical energy power generation device, tracks a maximum current and voltage value of the electric energy, and outputs the electric energy to the first electric energy conversion module by using the maximum power if the maximum power of the electric energy is greater than or equal to a preset load power, including:
if the maximum power of the electric energy is larger than the preset load power, the maximum power point tracking module outputs first electric energy to the load through the first electric energy conversion module and outputs second electric energy to the energy storage battery through the second electric energy conversion module according to the preset load power; wherein a sum of energies of the first electrical energy and the second electrical energy is the electrical energy.
Optionally, the method further includes:
if the second electric energy conversion module detects that the energy storage battery is fully charged, the second electric energy conversion module sends full charge information to a controller;
the controller receives the full information and controls the maximum power point tracking module to transmit the electric energy to the inversion module according to the full information;
the inversion module converts the electric energy from direct current into alternating current and transmits the alternating current to a power grid.
Optionally, the method further includes:
the at least one light energy generating device sends light intensity information to the controller through the maximum power point tracking module;
the controller acquires the generated power of the at least one light energy generating device through the maximum power point tracking module according to the light intensity information;
the controller controls the second electric energy conversion module to output the electric energy in the energy storage battery to the first electric energy conversion module and/or controls the inversion module to output the electric energy in the power grid to the first electric energy conversion module according to the generated power, the preset load power and the battery power.
Optionally, the light intensity information includes first light intensity information and second light intensity information acquired at different times;
the controller obtains the generated power of the at least one light energy generating device through the maximum power point tracking module according to the light intensity information, and the method comprises the following steps:
when the controller detects that the first light intensity information is smaller than a first preset threshold value, the controller acquires the generated power of the at least one light energy generating device through the maximum power point tracking module;
after the controller obtains the generated power of the at least one light energy generating device through the maximum power point tracking module according to the light intensity information, the method further includes:
the controller detects that the second light intensity information is smaller than a second preset threshold value.
Optionally, the controller controls the second electric energy conversion module to output the electric energy in the energy storage battery to the first electric energy conversion module and/or controls the inverter module to output the electric energy in the power grid to the first electric energy conversion module according to the generated power, the preset load power and the battery power, and includes:
if the controller determines that the generated power and the battery power meet the preset load power, the second electric energy conversion module is controlled to output the electric energy in the energy storage battery to the first electric energy conversion module;
if the controller determines that the generated power and the battery power do not meet the preset load power, the second electric energy conversion module is controlled to output the electric energy in the energy storage battery to the first electric energy conversion module, and the inversion module is controlled to output the electric energy in the power grid to the first electric energy conversion module.
Optionally, if the inversion module is an inversion grid-connected and grid-disconnected module, the controller controls the inversion grid-connected and grid-disconnected module to disconnect from the grid when determining that the power grid has a power failure; and when the power grid is determined not to be powered off, controlling the inversion grid connection and disconnection module to be connected to the grid.
The beneficial effect of this application is: an embodiment of the present application provides a charging device, including: the system comprises a maximum power point tracking module, a first electric energy conversion module and a charging control module; the at least one light energy generating device is electrically connected with the maximum power point tracking module and is used for transmitting electric energy obtained by adopting light conversion to the maximum power point tracking module; the maximum power point tracking module is electrically connected with the first electric energy conversion module and used for tracking the maximum current and voltage value of the electric energy, and if the maximum power of the electric energy is larger than or equal to the preset load power, the electric energy is output to the first electric energy conversion module by adopting the maximum power; the first electric energy conversion module is electrically connected with the charging control module to convert the first direct-current voltage of the electric energy into a second direct-current voltage, so that the charging control module charges the load according to the second direct-current voltage. The first direct current voltage of the electric energy transmitted by the maximum power point tracking module is converted into the second direct current voltage by the first electric energy conversion module, the charging control module can charge the load according to the second direct current voltage, only once conversion is carried out on the electric energy, frequent conversion is not needed, loss of the electric energy in the conversion process is reduced, and the utilization rate of the electric energy is improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained from the drawings without inventive effort.
Fig. 1 is a schematic structural diagram of a charging device according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of a charging device according to an embodiment of the present disclosure;
fig. 3 is a schematic structural diagram of a charging device according to an embodiment of the present disclosure;
fig. 4 is a schematic structural diagram of a charging device according to an embodiment of the present disclosure;
fig. 5 is a schematic flowchart of a charging control method according to an embodiment of the present disclosure;
fig. 6 is a schematic flowchart of a charging control method according to an embodiment of the present disclosure;
fig. 7 is a schematic flowchart of a charging control method according to an embodiment of the present disclosure;
fig. 8 is a flowchart illustrating a charging control method according to an embodiment of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments.
Thus, the following detailed description of the embodiments of the present application, presented in the accompanying drawings, is not intended to limit the scope of the claimed application, but is merely representative of selected embodiments of the application. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the description of the present application, it should be noted that if the terms "upper", "lower", etc. are used for indicating the orientation or positional relationship based on the orientation or positional relationship shown in the drawings or the orientation or positional relationship which is usually arranged when the product of the application is used, the description is only for convenience of describing the application and simplifying the description, but the indication or suggestion that the referred device or element must have a specific orientation, be constructed in a specific orientation and operation, and thus, cannot be understood as the limitation of the application.
Furthermore, the terms "first," "second," and the like in the description and in the claims of the present application and in the above-described drawings are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It should be understood that the data so used may be interchanged under appropriate circumstances such that embodiments of the application described herein may be implemented in sequences other than those illustrated or described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed, but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
It should be noted that the features of the embodiments of the present application may be combined with each other without conflict.
In the related art, direct current generated by photovoltaic power generation is transmitted to commercial power, and the commercial power is adopted to charge the electric automobile. Specifically, the direct current generated by photovoltaic power generation is sequentially converted into direct current (DC/DC) and direct current (AC/DC) through a DC/DC converter and a DC/AC converter of a grid-connected inverter and an On-board battery charger (On-board charger) and then converted into direct current (AC/DC) to charge the electric vehicle. However, in the related art, the dc generated by the photovoltaic power generation is transmitted to the commercial power, and the commercial power is used to charge the electric vehicle, which requires frequent conversion of the current, thereby reducing the utilization rate of the electric energy.
To solve the foregoing technical problems in the related art, an embodiment of the present application provides a charging device, where at least one optical energy power generation device converts light into electric energy, a maximum power point tracking module outputs electric energy to a first electric energy conversion module using maximum power, the first electric energy conversion module converts a first direct current voltage of the electric energy into a second direct current voltage, and a charging control module can charge a load according to the second direct current voltage, only once convert the electric energy, without performing frequent conversion, reduce loss of the electric energy in a conversion process, and improve a utilization rate of the electric energy.
A charging device provided in an embodiment of the present application is explained below.
Fig. 1 is a schematic structural diagram of a charging device according to an embodiment of the present disclosure, and as shown in fig. 1, the charging device 100 may include: a maximum power point tracking module 101, a first electric energy conversion module 102, and a charging control module 103.
At least one optical energy power generation device 200 is electrically connected to the maximum power point tracking module 101, and is configured to transmit electric energy obtained by light conversion to the maximum power point tracking module 101; the maximum power point tracking module 101 is electrically connected to the first electric energy conversion module 102, and is configured to track a maximum current and voltage value of the electric energy, and output the electric energy to the first electric energy conversion module 102 by using the maximum power if the maximum power of the electric energy is greater than or equal to the power of the preset load 300; the first power conversion module 102 is electrically connected to the charging control module 103 to convert the first dc voltage of the power into a second dc voltage, so that the charging control module 103 charges the load 300 according to the second dc voltage.
It should be noted that the light energy generating devices 200 may be photovoltaic panels, and the number of the light energy generating devices 200 may be determined according to actual needs, for example, the number of the light energy generating devices 200 may be 2 or 4, which is not specifically limited in the embodiment of the present application.
In this embodiment of the present application, the Maximum Power Point Tracking module 101 may be an MPPT (Maximum Power Point Tracking, module 101); the first power conversion module 102 may be an isolated DC/DC module.
In some embodiments, at least one of the photovoltaic power generation apparatuses 200 uses the electrical energy obtained by the light conversion and transmits the electrical energy to the maximum power point tracking module 101; the maximum power point tracking module 101 acquires the electric energy, tracks the maximum current and voltage value of the electric energy, and judges whether the maximum power of the electric energy is greater than or equal to the power of a preset load 300, if so, the maximum power is adopted to output the electric energy to the first electric energy conversion module 102; the first electric energy conversion module 102 converts the first direct current voltage of the electric energy into a second direct current voltage, and transmits the second direct current voltage to the charging control module 103; the charging control module 103 charges the load 300 according to the second direct-current voltage.
In the embodiment of the present application, the load 300 may be an electric vehicle, and the charging control module 103 may be a vehicle charging control module; of course, the load 300 may be other types of electric loads 300, and the type of the charging control module 103 may be set according to the type of the load 300.
In summary, the embodiment of the present application provides a charging device 100, including: a maximum power point tracking module 101, a first electric energy conversion module 102 and a charging control module 103; the at least one light energy generating device 200 is electrically connected to the maximum power point tracking module 101, and is configured to transmit electric energy obtained by light conversion to the maximum power point tracking module 101; the maximum power point tracking module 101 is electrically connected to the first electric energy conversion module 102, and is configured to track a maximum current and voltage value of the electric energy, and output the electric energy to the first electric energy conversion module 102 by using the maximum power if the maximum power of the electric energy is greater than or equal to the power of the preset load 300; the first power conversion module 102 is electrically connected to the charging control module 103 to convert the first dc voltage of the power into a second dc voltage, so that the charging control module 103 charges the load 300 according to the second dc voltage. The first electric energy conversion module 102 converts the first direct current voltage of the electric energy transmitted by the maximum power point tracking module 101 into the second direct current voltage, and the charging control module 103 can charge the load 300 according to the second direct current voltage, only performs one conversion on the electric energy, does not need to perform frequent conversion, reduces the loss of the electric energy in the conversion process, and improves the utilization rate of the electric energy.
Optionally, fig. 2 is a schematic structural diagram of a charging device 100 provided in an embodiment of the present application, and as shown in fig. 2, the charging device 100 may further include: a second power conversion module 104;
the second electric energy conversion module 104 is electrically connected to the maximum power point tracking module 101 and the energy storage battery 400, and is configured to convert the first direct-current voltage of the electric energy output by the maximum power point tracking module 101 into a third direct-current voltage, and charge the energy storage battery 400 according to the third direct-current voltage.
In some embodiments, the maximum power point tracking module 101 may further output the electric energy to the second electric energy conversion module 104, and the second electric energy conversion module 104 converts the first direct-current voltage of the electric energy into a third direct-current voltage and charges the energy storage battery 400 according to the third direct-current voltage.
It should be noted that the maximum power point tracking module 101 may preferentially charge the load 300 through the first electric energy conversion module 102 and the charging control module 103, and then charge the energy storage battery 400 through the second electric energy conversion module 104; of course, the load 300 and the energy storage battery 400 may also be charged at the same time, which is not particularly limited in the embodiment of the present application.
Additionally, the second power conversion module 104 may be an isolated DC/DC module.
Optionally, fig. 3 is a schematic structural diagram of a charging device 100 provided in an embodiment of the present application, and fig. 4 is a schematic structural diagram of the charging device 100 provided in the embodiment of the present application, as shown in fig. 3 and 4, the method may further include: an inverter module 105 and a controller 106.
The inverter module 105 is electrically connected with the maximum power point tracking module 101, the inverter module 105 is further electrically connected with the power grid 500, the controller 106 is respectively in communication connection with the inverter module 105, the maximum power point tracking module 101 and the second electric energy conversion module 104, and the inverter module 105 is electrically connected with the charging control module 103;
the controller 106 is configured to control the maximum power point tracking module 101 to transmit electric energy to the inverter module 105 when the second electric energy conversion module 104 indicates that the energy storage battery 400 is fully charged, and the inverter module 105 is configured to convert ac power output by the power grid 500 into dc power and transmit the dc power to the load 300 through the charging control module 103.
The inverter module 105 may also be configured to convert the electric energy from the direct current to an alternating current, and transmit the alternating current to the power grid 500.
In some embodiments, if the second power conversion module 104 detects that the energy storage battery 400 is fully charged, the second power conversion module 104 sends a fully charged message to the controller 106; the controller 106 receives the full charge information and controls the maximum power point tracking module 101 to transmit electric energy to the inverter module 105 according to the full charge information, and the inverter module 105 converts the alternating current output by the power grid into direct current, or converts the electric energy transmitted by the maximum power point tracking module 101 into a second direct current voltage and transmits the second direct current voltage to the load 300 through the charge control module 103.
In addition, the inverter module 105 may also perform a power selling operation, convert the electric energy transmitted by the maximum power point tracking module 101 from direct current to alternating current, and transmit the alternating current to the power grid 500.
In the embodiment of the present application, when the energy storage battery 400 is fully charged, the electric energy generated by the light energy power generation device 200 can be sold to the power grid 500, so that the profit is increased.
It should be noted that, as shown in fig. 4, the controller 106, the inverter module 105, the maximum power point tracking module 101, and the second electric energy conversion module 104 may be connected to a main line to implement communication connection.
Optionally, as shown in fig. 4, the controller 106 is further communicatively connected to the first power conversion module 102, and the first power conversion module 102 is electrically connected to the second power conversion module 104;
the maximum power point tracking module 101 is configured to obtain light intensity information sent by at least one light energy power generation device 200, and send the light intensity information to the controller 106;
in addition, the controller 106 is configured to obtain the generated power of at least one optical energy power generation device 200 through the maximum power point tracking module 101 according to the light intensity information, and control the second power conversion module 104 to output the electric energy in the energy storage battery 400 to the first power conversion module 102 and/or control the inverter module 105 to output the electric energy in the power grid 500 to the first power conversion module 102 according to the generated power, the power of the preset load 300 and the battery power.
In the embodiment of the present application, the controller 106 may determine whether the photovoltaic power is unstable according to the light intensity information; if the photovoltaic power generation device is unstable, the photovoltaic power is compensated by adopting the electric energy in the energy storage battery 400 and/or the electric energy in the power grid 500 according to the power generation power, the preset load 300 power and the battery power, so that the electric energy provided by the charging device 100 can meet the preset load 300 power required by the load 300, the fluctuation difference of the photovoltaic power is supplemented in real time, the load 300 is stably charged, and the charging reliability is improved.
Optionally, the inversion module 105 is an inversion grid-connected module or an inversion grid-connected module.
A charging control method provided in an embodiment of the present application will be explained below, and the charging control method is applied to the charging device.
Fig. 5 is a schematic flowchart of a charging control method according to an embodiment of the present application, and as shown in fig. 5, the charging control method may include:
s501, at least one optical energy power generation device adopts electric energy obtained through light conversion and transmits the electric energy to the maximum power point tracking module.
S502, the maximum power point tracking module acquires electric energy transmitted by at least one optical energy power generation device, tracks the maximum current and voltage value of the electric energy, and outputs the electric energy to the first electric energy conversion module by adopting the maximum power if the maximum power of the electric energy is larger than or equal to the preset load power.
S503, the first electric energy conversion module converts the first direct current voltage of the electric energy into a second direct current voltage, and the second direct current voltage is output through the charging control module.
And S504, the charging control module charges the load according to the second direct current voltage.
Optionally, the step of obtaining, by the maximum power point tracking module in S502, the electric energy transmitted by the at least one optical energy power generation device, and tracking a maximum current and voltage value of the electric energy, where if the maximum power of the electric energy is greater than or equal to a preset load power, a process of outputting the electric energy to the first electric energy conversion module by using the maximum power may include:
if the maximum power of the electric energy is larger than the preset load power, the maximum power point tracking module outputs the first electric energy to the load through the first electric energy conversion module according to the preset load power, and outputs the second electric energy to the energy storage battery through the second electric energy conversion module;
wherein the energy sum of the first electric energy and the second electric energy is electric energy. The first electric energy is one part of electric energy, and the second electric energy is the other part of electric energy.
In the embodiment of the application, the first electric energy in the electric energy is transmitted to the load, the second electric energy in the electric energy is transmitted to the energy storage battery, and the load and the energy storage battery are charged simultaneously.
Optionally, the second electric energy conversion module converts the first direct-current voltage of the electric energy into a third direct-current voltage, and charges the energy storage battery according to the third direct-current voltage.
Optionally, fig. 6 is a schematic flow chart of a charging control method provided in the embodiment of the present application, and as shown in fig. 6, the method may further include:
s601, if the second electric energy conversion module detects that the energy storage battery is fully charged, the second electric energy conversion module sends full-charge information to the controller;
s602, the controller receives the full information and controls the maximum power point tracking module to transmit electric energy to the inversion module according to the full information;
and S603, converting the electric energy from the direct current into alternating current by the inverter module, and transmitting the alternating current to a power grid.
Optionally, fig. 7 is a schematic flowchart of a charging control method provided in the embodiment of the present application, and as shown in fig. 7, the method further includes:
s701, at least one piece of light energy power generation equipment sends light intensity information to a controller through a maximum power point tracking module;
s702, the controller acquires the generated power of at least one piece of light energy generating equipment through a maximum power point tracking module according to the light intensity information;
and S703, the controller controls the second electric energy conversion module to output the electric energy in the energy storage battery to the first electric energy conversion module and/or controls the inversion module to output the electric energy in the power grid to the first electric energy conversion module according to the generated power, the preset load power and the battery power.
It should be noted that, for explanation and effects of the above method, reference may be made to the charging device described in fig. 1 to fig. 4, which is not described in detail herein.
Optionally, the light intensity information includes first light intensity information and second light intensity information collected at different times.
Fig. 8 is a flowchart illustrating a charging control method according to an embodiment of the present application, and as shown in fig. 8, a process of acquiring, by the controller in S702, the generated power of at least one optical energy power generation device through the maximum power point tracking module according to the light intensity information may include:
s801, when the controller detects that the first light intensity information is smaller than a first preset threshold value, the controller obtains the generated power of at least one light energy generating device through a maximum power point tracking module.
After the process of acquiring the generated power of at least one optical energy power generation device by the maximum power point tracking module according to the light intensity information by the controller in S702, the method may further include:
s802, the controller detects that the second light intensity information is smaller than a second preset threshold value.
In some embodiments, the controller may determine whether the first light intensity information is a first preset threshold, and then obtain the generated power of the at least one light energy power generation device through the maximum power point tracking module; the controller may further determine whether the second light intensity information is smaller than a second preset threshold, and if so, execute the process of S703.
Optionally, the controller controls the second power conversion module to output the electric energy in the energy storage battery to the first power conversion module and/or controls the inverter module to output the electric energy in the power grid to the first power conversion module according to the generated power, the preset load power and the battery power, and includes:
if the controller determines that the power generation power and the battery power meet the preset load power, the second electric energy conversion module is controlled to output the electric energy in the energy storage battery to the first electric energy conversion module;
and if the controller determines that the generated power and the battery power do not meet the preset load power, the controller controls the second electric energy conversion module to output the electric energy in the energy storage battery to the first electric energy conversion module, and controls the inverter module to output the electric energy in the power grid to the first electric energy conversion module.
The photovoltaic power generation electric energy is transmitted to a load through the first electric energy conversion module and the charging control module in sequence; electric energy in the energy storage battery is transmitted to a load sequentially through the maximum power point tracking module, the second electric energy conversion module, the first electric energy conversion module and the charging control module; the electric energy in the power grid is transmitted to the load through the inverter module, the first electric energy conversion module and the charging control module in sequence.
In addition, the battery power may be a preset maximum output power of the energy storage battery.
In some embodiments, if the controller determines that the generated power and the battery power satisfy the preset load power, the controller may use a difference between the preset load power and the generated power as the output power of the energy storage battery; and controlling the second electric energy conversion module to output the electric energy in the energy storage battery to the first electric energy conversion module according to the output power of the energy storage battery, and certainly, controlling the maximum power point tracking module to output the electric energy to the first electric energy conversion module according to the generated power.
It should be noted that, when the controller determines that the generated power is unstable according to the light intensity information, the controller may preferentially adopt the electric energy in the energy storage battery to compensate the generated power, and use the electric energy generated by the photovoltaic power generation and the electric energy in the energy storage battery to charge the load at the same time, so that the charging of the load is more stable.
In other embodiments, if the controller determines that the generated power and the battery power do not satisfy the preset load power, the controller may use a difference between the preset load power and the generated power and the battery power as the output power of the power grid; the second electric energy conversion module is controlled to output the electric energy in the energy storage battery to the first electric energy conversion module with the battery power, the inversion module is controlled to output the electric energy in the power grid to the first electric energy conversion module with the power grid output power, and certainly, the maximum power point tracking module also needs to be controlled to output the electric energy to the first electric energy conversion module with the generated power.
In addition, if the controller determines that the generated power does not meet the preset load power and the second electric energy conversion module indicates that no electricity is stored in the energy storage battery, the controller can use the difference value between the preset load power and the generated power as the output power of the power grid; and the control inversion module outputs the electric energy in the power grid to the first electric energy conversion module by the output power of the power grid, and controls the maximum power point tracking module to output the electric energy to the first electric energy conversion module by the generated power.
In addition, if the controller determines that the generated power does not meet the preset load power and the power grid has power failure, the controller can use the difference value between the preset load power and the generated power as the output power of the energy storage battery; and controlling the second electric energy conversion module to output the electric energy in the energy storage battery to the first electric energy conversion module according to the output power of the energy storage battery, and certainly, controlling the maximum power point tracking module to output the electric energy to the first electric energy conversion module according to the generated power.
Optionally, if the inversion module is an inversion grid-connected and grid-disconnected module, the controller controls the inversion grid-connected and grid-disconnected module to disconnect from the grid when determining that the power grid has a power failure; and when the power grid is determined not to be powered off, controlling the inversion grid-connected and off-grid module to be connected to the grid.
In summary, an embodiment of the present application provides a charging control method, including: at least one optical energy power generation device adopts electric energy obtained by light conversion and transmits the electric energy to the maximum power point tracking module; the maximum power point tracking module acquires electric energy transmitted by at least one optical energy power generation device, tracks the maximum current and voltage value of the electric energy, and outputs the electric energy to the first electric energy conversion module by adopting the maximum power if the maximum power of the electric energy is greater than or equal to the preset load power; the first electric energy conversion module converts the first direct-current voltage of the electric energy into a second direct-current voltage and transmits the second direct-current voltage to the charging control module; and the charging control module charges the load according to the second direct-current voltage. The first direct current voltage of the electric energy transmitted by the maximum power point tracking module is converted into the second direct current voltage by the first electric energy conversion module, the charging control module can charge the load according to the second direct current voltage, only once conversion is carried out on the electric energy, frequent conversion is not needed, loss of the electric energy in the conversion process is reduced, and the utilization rate of the electric energy is improved.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (10)
1. A charging device, comprising: the system comprises a maximum power point tracking module, a first electric energy conversion module and a charging control module;
at least one optical energy generating device is electrically connected with the maximum power point tracking module and is used for transmitting electric energy obtained by adopting light conversion to the maximum power point tracking module;
the maximum power point tracking module is electrically connected with the first electric energy conversion module and is used for tracking the maximum current and voltage value of the electric energy, and if the maximum power of the electric energy is greater than or equal to the preset load power, the maximum power is adopted to output the electric energy to the first electric energy conversion module;
the first electric energy conversion module is electrically connected with the charging control module to convert the first direct-current voltage of the electric energy into a second direct-current voltage, so that the charging control module charges a load according to the second direct-current voltage.
2. The apparatus of claim 1, further comprising: a second power conversion module;
the second electric energy conversion module is respectively electrically connected with the maximum power point tracking module and the energy storage battery and is used for converting the first direct-current voltage of the electric energy output by the maximum power point tracking module into a third direct-current voltage and charging the energy storage battery through the third direct-current voltage.
3. The apparatus of claim 2, further comprising: the inverter module and the controller;
the controller is respectively in communication connection with the inversion module, the maximum power point tracking module and the second electric energy conversion module, and the inversion module is electrically connected with the charging control module;
the controller is used for controlling the maximum power point tracking module to transmit the electric energy to the inversion module when the second electric energy conversion module indicates that the energy storage battery is fully charged; and the inversion module is used for converting the alternating current output by the power grid into direct current and transmitting the direct current to a load through the charging control module.
4. The apparatus of claim 3, wherein the controller is further in communication with the first power conversion module, the first power conversion module being electrically connected to the second power conversion module;
the maximum power point tracking module is used for acquiring light intensity information sent by the at least one light energy power generation device and sending the light intensity information to the controller;
the controller is configured to obtain the generated power of the at least one light energy power generation device through the maximum power point tracking module according to the light intensity information, and control the second electric energy conversion module to output the electric energy in the energy storage battery to the first electric energy conversion module and/or control the inverter module to output the electric energy in the power grid to the first electric energy conversion module according to the generated power, the preset load power and the battery power.
5. A charging control method applied to the charging device according to any one of claims 1 to 4, the method comprising:
at least one optical energy power generation device adopts electric energy obtained by light conversion and transmits the electric energy to a maximum power point tracking module;
the maximum power point tracking module acquires the electric energy transmitted by the at least one optical energy power generation device, tracks the maximum current and voltage value of the electric energy, and outputs the electric energy to the first electric energy conversion module by adopting the maximum power if the maximum power of the electric energy is greater than or equal to a preset load power;
the first electric energy conversion module converts the first direct-current voltage of the electric energy into a second direct-current voltage and outputs the second direct-current voltage through the charging control module;
the charging control module charges a load according to the second direct-current voltage.
6. The method of claim 5, wherein the charging device further comprises: the second electric energy conversion module is electrically connected with the maximum power point tracking module and the energy storage battery respectively;
the maximum power point tracking module obtains the electric energy transmitted by the at least one optical energy power generation device, tracks a maximum current and voltage value of the electric energy, and outputs the electric energy to a first electric energy conversion module by adopting the maximum power if the maximum power of the electric energy is greater than or equal to a preset load power, and the maximum power point tracking module comprises:
if the maximum power of the electric energy is larger than the preset load power, the maximum power point tracking module outputs first electric energy to the load through the first electric energy conversion module and outputs second electric energy to the energy storage battery through the second electric energy conversion module according to the preset load power; wherein the sum of the energies of the first electrical energy and the second electrical energy is the electrical energy.
7. The method of claim 6, wherein the charging device further comprises: the inverter module and the controller; the controller is respectively in communication connection with the inversion module, the maximum power point tracking module and the second electric energy conversion module, and the inversion module is electrically connected with the charging control module; the controller is also in communication connection with the first electric energy conversion module, and the first electric energy conversion module is electrically connected with the second electric energy conversion module;
the method further comprises the following steps:
the at least one light energy generating device sends light intensity information to the controller through the maximum power point tracking module;
the controller acquires the generated power of the at least one light energy generating device through the maximum power point tracking module according to the light intensity information;
the controller controls the second electric energy conversion module to output the electric energy in the energy storage battery to the first electric energy conversion module and/or controls the inversion module to output the electric energy in the power grid to the first electric energy conversion module according to the generated power, the preset load power and the battery power.
8. The method of claim 7, wherein the light intensity information comprises first and second light intensity information collected at different times;
the controller obtains the generated power of the at least one light energy generating device through the maximum power point tracking module according to the light intensity information, and the method comprises the following steps:
the controller detects that the first light intensity information is smaller than a first preset threshold value, and the generated power of the at least one light energy generating device is obtained through the maximum power point tracking module;
after the controller obtains the generated power of the at least one light energy generating device through the maximum power point tracking module according to the light intensity information, the method further includes:
the controller detects that the second light intensity information is smaller than a second preset threshold value.
9. The method according to claim 8, wherein the controller controls the second power conversion module to output the electric energy in the energy storage battery to the first power conversion module and/or controls the inverter module to output the electric energy in the power grid to the first power conversion module according to the generated power, the preset load power and the battery power, and comprises:
if the controller determines that the generated power and the battery power meet the preset load power, the second electric energy conversion module is controlled to output the electric energy in the energy storage battery to the first electric energy conversion module;
and if the controller determines that the generated power and the battery power do not meet the preset load power, the controller controls the second electric energy conversion module to output the electric energy in the energy storage battery to the first electric energy conversion module, and controls the inverter module to output the electric energy in the power grid to the first electric energy conversion module.
10. The method according to claim 7, wherein if the inversion module is an inversion grid-connected and grid-disconnected module, the controller controls the inversion grid-connected and grid-disconnected module to disconnect from the grid when determining that the power grid fails; and when the power grid is determined not to be powered off, controlling the inversion grid connection and disconnection module to be connected to the grid.
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