CN110912184A - Multi-channel photovoltaic system control method and device, controller and system - Google Patents
Multi-channel photovoltaic system control method and device, controller and system Download PDFInfo
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- 238000012423 maintenance Methods 0.000 description 5
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
- H02S40/36—Electrical components characterised by special electrical interconnection means between two or more PV modules, e.g. electrical module-to-module connection
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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
Abstract
The embodiment of the application provides a control method, a control device and a control system for a multi-path photovoltaic system, and relates to the technical field of photoelectricity.
Description
Technical Field
The application belongs to the technical field of photoelectricity, and particularly relates to a multi-channel photovoltaic system control method, a multi-channel photovoltaic system control device, a multi-channel photovoltaic system controller and a multi-channel photovoltaic system control system.
Background
With the popularization of household photovoltaic systems, demand scenes of joint use of a plurality of photovoltaic system branches gradually appear, and the existing photovoltaic system linkage scheme is that the photovoltaic systems of all the branches are connected in parallel after being converted (inverted). However, this linkage method requires a plurality of branch photovoltaic systems to operate simultaneously, which undoubtedly increases the system operation cost and maintenance cost.
Disclosure of Invention
In order to solve the problems of high system operation cost and high cost in the existing photovoltaic system linkage scheme at least to a certain extent, the application provides a multi-path photovoltaic system control method, a multi-path photovoltaic system control device, a multi-path photovoltaic system controller and a multi-path photovoltaic system linkage system, and the multi-path photovoltaic system control method, the multi-path photovoltaic system control device, the multi-path photovoltaic system controller and the multi-path photovoltaic system linkage system are used for reducing the operation cost.
In order to achieve the purpose, the following technical scheme is adopted in the application:
in a first aspect, a multi-channel photovoltaic system control method is provided, including:
determining the electric quantity output requirement of the first branch photovoltaic system;
and if the electric quantity output requirement is larger than the electric quantity output capacity of the first branch photovoltaic system, connecting the stage circuit before current transformation in at least one second branch photovoltaic system in parallel with the stage circuit before current transformation in the first branch photovoltaic system so as to enable the electric quantity output of the first branch photovoltaic system to meet the electric quantity output requirement.
In a second aspect, a multi-channel photovoltaic system control device is provided, which includes:
the demand determining module is used for determining the electric quantity output demand of the first branch photovoltaic system;
and the linkage control module is used for connecting the stage circuit before current transformation in at least one second branch photovoltaic system in parallel with the stage circuit before current transformation in the first branch photovoltaic system if the electric quantity output requirement is greater than the electric quantity output capacity of the first branch photovoltaic system, so that the electric quantity output of the first branch photovoltaic system meets the electric quantity output requirement.
In a third aspect, a controller is provided for performing the multi-channel photovoltaic system control method as described in any one of the above.
In a fourth aspect, there is provided a multi-branch photovoltaic system, comprising: the system comprises a main controller and a plurality of branch photovoltaic systems; in each two branch photovoltaic systems, a first switch is arranged between the tail ends of the stage circuits before current transformation; in each branch photovoltaic system, a second switch is arranged between the tail end of the stage circuit before current transformation and the subsequent stage circuit;
the main controller is used for determining the electric quantity output requirement of the first branch photovoltaic system; if the electric quantity output requirement is larger than the electric quantity output capacity of the first branch photovoltaic system, at least one second branch photovoltaic system is connected with the first switch between the first branch photovoltaic systems, and the second switch in the second branch photovoltaic system is disconnected correspondingly, so that the first branch photovoltaic system is connected with the at least one second branch photovoltaic system in parallel, and the electric quantity output of the first branch photovoltaic system meets the electric quantity output requirement.
According to the multi-path photovoltaic system control method, the multi-path photovoltaic system control device, the multi-path photovoltaic system control controller and the multi-path photovoltaic system, when the fact that the electric quantity output requirement of the first branch photovoltaic system is larger than the electric quantity output capacity of the first branch photovoltaic system is determined, the stage circuit before current transformation in the at least one path of second branch photovoltaic system is connected in parallel with the stage circuit before current transformation in the first branch photovoltaic system, so that the electric quantity output of the first branch photovoltaic system meets the electric quantity output requirement, and therefore the electric quantity output requirement on any branch is met through the parallel connection of the multiple branch photovoltaic systems.
In the scheme, the stage circuit before current transformation in the second branch photovoltaic system is connected in parallel with the stage circuit before current transformation in the first branch photovoltaic system to realize linkage of the multi-branch photovoltaic system, and the circuits in the current transformation stage and the subsequent stage in the second branch photovoltaic system are not required to be in a working state continuously, so that the operation cost and the maintenance cost of linkage of the multi-branch photovoltaic system are reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments or related technologies of the present application, the drawings needed to be used in the description of the embodiments or related technologies are briefly introduced below, it is obvious that the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.
FIG. 1 is a flow chart of a control method of a multi-branch photovoltaic system in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a control device of a multi-branch photovoltaic system in an embodiment of the present application;
fig. 3 is a schematic structural diagram of a multi-branch photovoltaic system in an embodiment of the present application.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the technical solutions of the present application will be described in detail below. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without making any creative effort, shall fall within the protection scope of the present application.
Example one
The embodiment of the invention provides a control method of a multi-branch photovoltaic system, which comprises the following steps as shown in fig. 1:
and S110, determining the electric quantity output requirement of the first branch photovoltaic system.
In the scheme, each branch photovoltaic system in the multi-branch photovoltaic system can independently complete all stages of circuits from photoelectric conversion (photovoltaic panel), current conversion (mainly inversion for the photovoltaic system) to electric quantity output. The electric quantity output here mainly includes output current.
In practical application scenarios, each branch photovoltaic system can serve the power consumption demand of a user home, a floor in a building, or even a company user. The user can select the electric quantity output demand of the branch photovoltaic system used by the user according to actual demands. These branch photovoltaic systems, which are dedicated to their own power needs with respect to these users, may be referred to as first branch photovoltaic systems.
And S120, if the electric quantity output requirement is larger than the electric quantity output capacity of the first branch photovoltaic system, connecting the stage circuit before current transformation in the at least one second branch photovoltaic system in parallel with the stage circuit before current transformation in the first branch photovoltaic system so that the electric quantity output of the first branch photovoltaic system meets the electric quantity output requirement.
When the electric quantity output requirement of a certain user is greater than the electric quantity output capacity of the first branch photovoltaic system used by the user, for example, the user turns on a large number of electric equipment at the same time, so that the required power supply current is increased and exceeds the current output capacity of the branch photovoltaic system used by the user. At this time, other branch photovoltaic systems (non-first branch photovoltaic systems) in the multi-branch photovoltaic system may be connected in parallel with the current first branch photovoltaic system. These so-called other branch photovoltaic systems are the second branch photovoltaic systems described above. The second branch photovoltaic system may be an idle branch photovoltaic system.
In a specific embodiment, before the stage circuit before current transformation in the second branch photovoltaic system of at least one branch is connected in parallel with the stage circuit before current transformation in the first branch photovoltaic system, the method further includes:
determining that an idle second branch photovoltaic system exists. Only the second branch photovoltaic system which is idle can be used for linkage operation with the second branch photovoltaic system. Certainly, if no idle second branch photovoltaic system exists, the first branch photovoltaic system is controlled to output the maximum capacity electric quantity of the first branch photovoltaic system, so that the normal power consumption of users on other branch photovoltaic systems is prevented from being influenced while the power consumption requirement of the users is met as much as possible.
In a specific embodiment, a first switch is arranged between the tail ends of the stage circuits before current transformation in the first branch photovoltaic system and the second branch photovoltaic system;
correspondingly, the step of connecting the stage circuit before current transformation in the second branch photovoltaic system of at least one branch in parallel with the stage circuit before current transformation in the first branch photovoltaic system may include: and conducting a first switch in the at least one second branch photovoltaic system. The two branch photovoltaic systems to be connected in parallel are connected in parallel before current transformation by switching on the first switch, the output of the electric quantity after the parallel connection can be continuously processed by current transformation in the first branch photovoltaic system and a circuit at a subsequent stage, and finally the output of the first branch photovoltaic system is output from the output end of the first branch photovoltaic system and provided for a user.
In a specific embodiment, in the second branch photovoltaic system, a second switch is arranged between the tail end of the stage circuit before current transformation and the subsequent stage circuit;
correspondingly, in the process of conducting the first switch in the second branch photovoltaic system of at least one branch, the second switch in the corresponding second branch photovoltaic system is disconnected. By disconnecting the second switch, circuits in the current transformation stage and the subsequent stage of the photovoltaic system of the second branch circuit participating in parallel connection are in a non-working state, so that the operation cost and the maintenance cost of the system are reduced when the system is connected in parallel.
In a specific embodiment, if the power output requirement (of the first branch photovoltaic system) is not greater than the power output capability of the first branch photovoltaic system, the first branch photovoltaic system is controlled to output power meeting the power output requirement, so that the additional control cost caused by parallel connection of the systems is reduced as much as possible.
According to the control method of the multi-path photovoltaic system, when the electric quantity output requirement of the first branch photovoltaic system is determined to be larger than the electric quantity output capacity of the first branch photovoltaic system, the stage circuit before current transformation in the at least one path of second branch photovoltaic system is connected in parallel with the stage circuit before current transformation in the first branch photovoltaic system, so that the electric quantity output of the first branch photovoltaic system meets the electric quantity output requirement, and the electric quantity output requirement on any branch is met through the parallel connection of the multiple branch photovoltaic systems.
In the scheme, the stage circuit before current transformation in the second branch photovoltaic system is connected in parallel with the stage circuit before current transformation in the first branch photovoltaic system to realize linkage of the multi-branch photovoltaic system, and the circuits in the current transformation stage and the subsequent stage in the second branch photovoltaic system are not required to be in a working state continuously, so that the operation cost and the maintenance cost of linkage of the multi-branch photovoltaic system are reduced.
Example two
In order to implement the above multi-channel photovoltaic system control method cooperatively, an embodiment of the present invention provides a multi-channel photovoltaic system control apparatus, as shown in fig. 2, the apparatus includes:
a requirement determining module 210, configured to determine an electric quantity output requirement of the first branch photovoltaic system;
and the linkage control module 220 is configured to, if the electric quantity output requirement is greater than the electric quantity output capability of the first branch photovoltaic system, connect the stage circuit before current transformation in the at least one second branch photovoltaic system in parallel with the stage circuit before current transformation in the first branch photovoltaic system, so that the electric quantity output of the first branch photovoltaic system meets the electric quantity output requirement.
In a specific embodiment, in the first branch photovoltaic system and the second branch photovoltaic system, a first switch is disposed between ends of stage circuits before current transformation;
and the linkage control module 220 may be configured to turn on a first switch in the at least one second branch photovoltaic system.
In a specific embodiment, in the second branch photovoltaic system, a second switch is disposed between the end of the stage circuit before current transformation and the subsequent stage circuit;
the coordinated control module 220 may be configured to disconnect the second switch in the corresponding second branch photovoltaic system in the process of turning on the first switch in the second branch photovoltaic system of at least one path.
In a specific embodiment, the coordinated control module 220 may be further configured to determine that there is an idle second branch photovoltaic system before the stage circuit before the current transformation in the second branch photovoltaic system of the at least one branch is connected in parallel with the stage circuit before the current transformation in the first branch photovoltaic system.
In a specific embodiment, the linkage control module 220 is further configured to control the first branch photovoltaic system to output the maximum capacity electric quantity if there is no idle second branch photovoltaic system.
In a specific embodiment, the linkage control module 220 is further configured to control the first branch photovoltaic system to output the electric quantity meeting the electric quantity output requirement if the electric quantity output requirement is not greater than the electric quantity output capacity of the first branch photovoltaic system.
Further, the present embodiment also provides a controller, configured to execute any one of the above methods for controlling a multi-branch photovoltaic system.
Further, as shown in fig. 3, the present embodiment further provides a multi-branch photovoltaic system, including: a main controller 310 and a multi-branch photovoltaic system 320; in each two-branch photovoltaic system 320, a first switch 321 is arranged between the tail ends of the stage circuits before current transformation; in each branch photovoltaic system 320, a second switch 322 is arranged between the tail end of the stage circuit before current transformation and the subsequent stage circuit;
a main controller 310 for determining an electric quantity output requirement of the first branch photovoltaic system; if the electric quantity output requirement is larger than the electric quantity output capacity of the first branch photovoltaic system, a first switch 321 between the at least one second branch photovoltaic system and the first branch photovoltaic system is switched on, and a second switch 322 in the corresponding second branch photovoltaic system is switched off, so that the first branch photovoltaic system is connected with the at least one second branch photovoltaic system in parallel, and the electric quantity output of the first branch photovoltaic system meets the electric quantity output requirement.
In a specific embodiment, the first branch pv system may be any one of the plurality of branch pv systems 320, and the second branch pv system may be any one of the plurality of branch pv systems 320 that is not the first branch pv system.
In one embodiment, the main controller 310 may be a Graphic Display Controller (GDC). The GDC is electrically connected to the first switch 321 and the second switch 322 in each branch photovoltaic system 320, and the user controls the on/off state thereof.
In a specific embodiment, the main controller 310 controls the first switches 321 in the branch photovoltaic systems 320 that are not connected in parallel to be in an open state, so as to achieve the interlock.
The main controller 310 in this embodiment may include the functional modules of the multi-branch photovoltaic system control apparatus.
According to the multi-path photovoltaic system control method, the multi-path photovoltaic system control device, the multi-path photovoltaic system control controller and the multi-path photovoltaic system, when the fact that the electric quantity output requirement of the first branch photovoltaic system is larger than the electric quantity output capacity of the first branch photovoltaic system is determined, the stage circuit before current transformation in the at least one path of second branch photovoltaic system is connected in parallel with the stage circuit before current transformation in the first branch photovoltaic system, so that the electric quantity output of the first branch photovoltaic system meets the electric quantity output requirement, and therefore the electric quantity output requirement on any branch is met through the parallel connection of the multiple branch photovoltaic systems.
In the scheme, the stage circuit before current transformation in the second branch photovoltaic system is connected in parallel with the stage circuit before current transformation in the first branch photovoltaic system to realize linkage of the multi-branch photovoltaic system, and the circuits in the current transformation stage and the subsequent stage in the second branch photovoltaic system are not required to be in a working state continuously, so that the operation cost and the maintenance cost of linkage of the multi-branch photovoltaic system are reduced.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
It is understood that the same or similar parts in the above embodiments may be mutually referred to, and the same or similar parts in other embodiments may be referred to for the content which is not described in detail in some embodiments.
It should be noted that, in the description of the present application, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance. Further, in the description of the present application, the meaning of "a plurality" means at least two unless otherwise specified.
Any process or method descriptions in flow charts or otherwise described herein may be understood as: represents modules, segments or portions of code which include one or more executable instructions for implementing specific logical functions or steps of a process, and the scope of the preferred embodiments of the present application includes other implementations in which functions may be executed out of order from that shown or discussed, including substantially concurrently or in reverse order, depending on the functionality involved, as would be understood by those reasonably skilled in the art of the embodiments of the present application.
It should be understood that portions of the present application may be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, the various steps or methods may be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, any one or combination of the following techniques, which are known in the art, may be used: a discrete logic circuit having a logic gate circuit for implementing a logic function on a data signal, an application specific integrated circuit having an appropriate combinational logic gate circuit, a Programmable Gate Array (PGA), a Field Programmable Gate Array (FPGA), or the like.
It will be understood by those skilled in the art that all or part of the steps carried by the method for implementing the above embodiments may be implemented by hardware related to instructions of a program, which may be stored in a computer readable storage medium, and when the program is executed, the program includes one or a combination of the steps of the method embodiments.
In addition, functional units in the embodiments of the present application may be integrated into one processing module, or each unit may exist alone physically, or two or more units are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode. The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may also be stored in a computer readable storage medium.
The storage medium mentioned above may be a read-only memory, a magnetic or optical disk, etc.
In the description herein, reference to the description of the term "one embodiment," "some embodiments," "an example," "a specific example," or "some examples," etc., means that a particular feature, structure, material, or characteristic described in connection with the embodiment or example is included in at least one embodiment or example of the application. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
Although embodiments of the present application have been shown and described above, it is understood that the above embodiments are exemplary and should not be construed as limiting the present application, and that variations, modifications, substitutions and alterations may be made to the above embodiments by those of ordinary skill in the art within the scope of the present application.
Claims (11)
1. A multi-branch photovoltaic system control method is characterized by comprising the following steps:
determining the electric quantity output requirement of the first branch photovoltaic system;
and if the electric quantity output requirement is larger than the electric quantity output capacity of the first branch photovoltaic system, connecting the stage circuit before current transformation in at least one second branch photovoltaic system in parallel with the stage circuit before current transformation in the first branch photovoltaic system so as to enable the electric quantity output of the first branch photovoltaic system to meet the electric quantity output requirement.
2. The method according to claim 1, wherein a first switch is arranged between the end of the stage circuit before current transformation in the first branch photovoltaic system and the second branch photovoltaic system;
the step of connecting the stage circuit before current transformation in the second branch photovoltaic system of at least one branch in parallel with the stage circuit before current transformation in the first branch photovoltaic system comprises:
and switching on the first switch in the second branch photovoltaic system of the at least one branch.
3. The method according to claim 2, wherein a second switch is arranged between the end of the stage circuit before current transformation and the subsequent stage circuit in the second branch photovoltaic system;
the method further comprises the following steps: and in the process of switching on the first switch in the second branch photovoltaic system of the at least one path, switching off the second switch in the corresponding second branch photovoltaic system.
4. The method of claim 2, further comprising, prior to connecting the pre-converter stage circuit in the second branch photovoltaic system of at least one branch in parallel with the pre-converter stage circuit in the first branch photovoltaic system:
determining that there is an idle second branch photovoltaic system.
5. The method of claim 4, further comprising:
and if the second branch photovoltaic system is not idle, controlling the first branch photovoltaic system to output the self maximum capacity electric quantity.
6. The method of claim 1, further comprising:
and if the electric quantity output requirement is not greater than the electric quantity output capacity of the first branch photovoltaic system, controlling the first branch photovoltaic system to output the electric quantity meeting the electric quantity output requirement.
7. A multi-branch photovoltaic system control device, comprising:
the demand determining module is used for determining the electric quantity output demand of the first branch photovoltaic system;
and the linkage control module is used for connecting the stage circuit before current transformation in at least one second branch photovoltaic system in parallel with the stage circuit before current transformation in the first branch photovoltaic system if the electric quantity output requirement is greater than the electric quantity output capacity of the first branch photovoltaic system, so that the electric quantity output of the first branch photovoltaic system meets the electric quantity output requirement.
8. The device according to claim 7, wherein a first switch is arranged between the end of the stage circuit before current transformation in the first branch photovoltaic system and the second branch photovoltaic system;
and the linkage control module is used for conducting the first switch in the at least one second branch photovoltaic system.
9. The device according to claim 8, wherein a second switch is arranged between the end of the stage circuit before current transformation and the subsequent stage circuit in the second branch photovoltaic system;
the linkage control module is used for switching off the second switch in the corresponding second branch photovoltaic system in the process of switching on the first switch in the at least one second branch photovoltaic system.
10. A controller for performing the multi-branch photovoltaic system control method of any one of claims 1 to 6.
11. A multi-branch photovoltaic system, comprising: the system comprises a main controller and a plurality of branch photovoltaic systems; in each two branch photovoltaic systems, a first switch is arranged between the tail ends of the stage circuits before current transformation; in each branch photovoltaic system, a second switch is arranged between the tail end of the stage circuit before current transformation and the subsequent stage circuit;
the main controller is used for determining the electric quantity output requirement of the first branch photovoltaic system; if the electric quantity output requirement is larger than the electric quantity output capacity of the first branch photovoltaic system, at least one second branch photovoltaic system is connected with the first switch between the first branch photovoltaic systems, and the second switch in the second branch photovoltaic system is disconnected correspondingly, so that the first branch photovoltaic system is connected with the at least one second branch photovoltaic system in parallel, and the electric quantity output of the first branch photovoltaic system meets the electric quantity output requirement.
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| CN109167392A (en) * | 2018-10-09 | 2019-01-08 | 珠海格力电器股份有限公司 | A kind of system control method and photovoltaic system and air-conditioning system |
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Application publication date: 20200324 |