CN110266095B - Photovoltaic power generation system and cleaning control method thereof - Google Patents
Photovoltaic power generation system and cleaning control method thereof Download PDFInfo
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- 238000004140 cleaning Methods 0.000 title claims abstract description 152
- 238000010248 power generation Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 37
- 238000004891 communication Methods 0.000 claims abstract description 71
- 230000007246 mechanism Effects 0.000 claims abstract description 20
- 230000005611 electricity Effects 0.000 claims abstract description 6
- 238000005507 spraying Methods 0.000 claims description 31
- 239000000428 dust Substances 0.000 claims description 25
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 22
- 238000007405 data analysis Methods 0.000 claims description 8
- 239000007921 spray Substances 0.000 claims description 6
- 238000004806 packaging method and process Methods 0.000 claims description 2
- 230000008569 process Effects 0.000 description 5
- 238000009825 accumulation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000001514 detection method Methods 0.000 description 3
- 230000006870 function Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000004590 computer program Methods 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000012423 maintenance Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 238000002834 transmittance Methods 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
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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
- 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
- H02S40/10—Cleaning arrangements
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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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Abstract
The application discloses a photovoltaic power generation system and a cleaning control method thereof, which aim to reduce the cost of an automatic cleaning device. The system comprises a communication switchboard and a photovoltaic inverter with the same multi-path structure, wherein the photovoltaic inverter comprises inverter main circuits and inverter controllers, the input of each inverter main circuit is independent, the output of each inverter main circuit is parallel, the communication switchboard is in communication connection with each inverter controller, and in addition: the system also comprises cleaning device executing mechanisms which are arranged in one-to-one correspondence with the photovoltaic inverters; the photovoltaic inverter also comprises a switching power supply, the switching power supply gets electricity from the inverter main circuit, the electric energy output end of the switching power supply is connected to the power supply interface of the cleaning device executing mechanism corresponding to the photovoltaic inverter, and the control end of the switching power supply is connected to the inverter controller; the inversion controller is used for calculating the next best cleaning date of the photovoltaic group string connected to the photovoltaic inverter of the current path, reporting the calculated date to the communication switchboard, and controlling the switching power supply to supply power to the outside when receiving a cleaning instruction issued by the communication switchboard.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a photovoltaic power generation system and a cleaning control method thereof.
Background
Dust is easily accumulated on an outdoor solar cell panel which is exposed outdoors all the year round, the light transmittance of the surface of the solar cell panel is weakened by the dust accumulation, the photoelectric conversion efficiency of the solar cell panel is reduced, and the local dust accumulation can also cause a hot spot effect to bring potential safety hazards, so that the dust accumulation solar cell panel is necessary to be effectively cleaned.
Automatic cleaning devices (such as cleaning robots, water cleaning devices and the like) introduced at the present stage in the photovoltaic power station are independent of the photovoltaic power station on software and hardware, are independently controlled and operate, and are high in cost.
Disclosure of Invention
In view of this, the invention provides a photovoltaic power generation system and a cleaning control method thereof, so as to reduce the investment cost of an automatic cleaning device.
The utility model provides a photovoltaic power generation system, includes communication switchboard and the same photovoltaic inverter of multichannel structure, photovoltaic inverter includes contravariant main circuit and inversion controller, and each contravariant main circuit input is independent, the output is parallelly connected, communication switchboard and each inversion controller communication connection, wherein:
the photovoltaic power generation system also comprises cleaning device executing mechanisms which are arranged in one-to-one correspondence with the photovoltaic inverters;
the photovoltaic inverter also comprises a switching power supply, the switching power supply obtains electricity from the inverter main circuit, the electric energy output end of the switching power supply is connected to a power interface of a cleaning device executing mechanism corresponding to the photovoltaic inverter, and the control end of the switching power supply is connected to the inverter controller;
the inversion controller is used for calculating the next best cleaning date of the photovoltaic group string connected to the photovoltaic inverter of the current path, reporting the calculated date to the communication switchboard, and controlling the switching power supply to supply power to the outside when receiving a cleaning instruction issued by the communication switchboard.
Optionally, each inverter controller in the photovoltaic power generation system is in communication connection with a cloud;
correspondingly, the inverter controller is specifically used for packaging and uploading voltage and current data of the photovoltaic inverter of the current path throughout the day to a cloud end, calculating the dust loss degree of the string by using a big data analysis algorithm through the cloud end, and sending the calculated dust loss degree of the string to the inverter controller; and then the inverter controller calculates the day capable of obtaining the maximum profit as the next best cleaning date of the photovoltaic string connected on the photovoltaic inverter according to the string dust loss degree and the local meteorological data.
Optionally, all the cleaning device actuators form a spraying pipe network together;
the spraying pipe network comprises a main pipeline provided with a water pump and a plurality of branch spraying pipelines with electromagnetic valves which are branched from the main pipeline, and each branch spraying pipeline is respectively responsible for cleaning a photovoltaic group string connected to one photovoltaic inverter;
and the electric energy output end of the switching power supply is connected to the pipeline valve corresponding to the photovoltaic inverter.
Optionally, the communication switchboard is further used for issuing a cleaning instruction to the inverter controller when the time reaches the date calculated by the inverter controller, and only one inverter controller is issued with the cleaning instruction at the same time.
Optionally, the inverter controller sets the self-state flag position to a first preset value when the time reaches the self-calculated date, and sets the self-state flag position to a second preset value when the time does not reach the self-calculated date or when the photovoltaic string connected to the photovoltaic inverter in the current path is completely cleaned;
and the communication switchboard screens out one inverter controller with the highest priority from the inverter controllers with the current state flag bit of the second preset value, and issues a cleaning instruction.
Optionally, the spraying pipe network further comprises a frequency converter;
the communication switchboard is used for controlling the frequency converter to regulate and modulate the pressure and the frequency of the water pump while issuing the cleaning instruction.
A cleaning control method for a photovoltaic power generation system comprises a communication switchboard and a plurality of photovoltaic inverters with the same structure, wherein each photovoltaic inverter comprises an inverter main circuit and an inverter controller, the input of each inverter main circuit is independent, the output of each inverter main circuit is connected in parallel, the communication switchboard is in communication connection with each inverter controller, and the cleaning control method comprises the following steps:
the photovoltaic power generation system also comprises cleaning device executing mechanisms which are arranged in one-to-one correspondence with the photovoltaic inverters;
the photovoltaic inverter also comprises a switching power supply, the switching power supply obtains electricity from the inverter main circuit, the electric energy output end of the switching power supply is connected to a power interface of a cleaning device executing mechanism corresponding to the photovoltaic inverter, and the control end of the switching power supply is connected to the inverter controller;
the cleaning control method of the photovoltaic power generation system comprises the following steps:
the inversion controller calculates the next optimal cleaning date of the photovoltaic string connected to the photovoltaic inverter of the current path;
reporting the calculated date to the communication switchboard;
and when receiving a cleaning instruction sent by the communication switchboard, controlling the switching power supply to supply power to the outside.
Optionally, each inverter controller in the photovoltaic power generation system is in communication connection with a cloud;
the inverter controller calculates the next best cleaning date of the photovoltaic string connected to the photovoltaic inverter, and specifically comprises:
the inversion controller packs voltage and current data of the photovoltaic inverter all day long and uploads the voltage and current data to the cloud end, the cloud end calculates the cluster dust loss degree by using a big data analysis algorithm, and the calculated cluster dust loss degree is issued to the inversion controller;
and the inverter controller calculates the day capable of obtaining the maximum profit as the next best cleaning date of the photovoltaic string connected on the photovoltaic inverter according to the received string dust loss degree and the local meteorological data.
Optionally, all the cleaning device actuators form a spraying pipe network together;
the spraying pipe network comprises a main pipeline provided with a water pump and a plurality of branch spraying pipelines with electromagnetic valves which are branched from the main pipeline, and each branch spraying pipeline is respectively responsible for cleaning a photovoltaic group string connected to one photovoltaic inverter;
the electric energy output end of the switching power supply is connected to a pipeline valve corresponding to the photovoltaic inverter in the circuit;
the cleaning control method of the photovoltaic power generation system further comprises the following steps:
and the communication switchboard issues a cleaning instruction to the inverter controllers with the time reaching the date calculated by the inverter controllers, and only one inverter controller is issued with the cleaning instruction at the same time.
Optionally, the spraying pipe network further comprises a frequency converter;
the cleaning control method of the photovoltaic power generation system further comprises the following steps:
and the communication switchboard is used for controlling the frequency converter to regulate and modulate the pressure and the frequency of the water pump while issuing a cleaning instruction.
According to the technical scheme, the known automatic cleaning device for the photovoltaic cell panel comprises a cleaning controller and a cleaning device executing mechanism, the inverter controller is reused as the cleaning controller, meanwhile, the power supply of the cleaning device executing mechanism is changed into a mode that a switching power supply directly gets power from an inverter main circuit, and related data transmission in a cleaning function is completed by directly utilizing an existing communication system in a photovoltaic power generation system, so that the use of one controller, one power supply and one set of communication system is omitted, the photovoltaic power station and the automatic cleaning device can be effectively shared on software and hardware resources, and the cost is reduced.
Secondly, the invention also provides a concept of cleaning the distributed power station, the cleaning work of the solar cell panel of the whole photovoltaic power station is carried out by regions, and all photovoltaic group strings connected to one photovoltaic inverter are taken as a cleaning region, so that the cleaning operation can be carried out in a targeted manner according to different cleaning requirements of each cleaning region, the granularity of the cleaning region is increased, and the flexibility is increased.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic diagram of a photovoltaic power generation system disclosed in the prior art;
FIG. 2 is a schematic structural diagram of a photovoltaic power generation system according to an embodiment of the present invention;
FIG. 3 is a flowchart of a cleaning control method for a photovoltaic power generation system according to an embodiment of the present invention;
fig. 4 is a flowchart of another cleaning control method for a photovoltaic power generation system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. 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 invention.
The photovoltaic power generation system disclosed by the embodiment of the invention is obtained by improving the traditional photovoltaic power generation system, and the traditional software and hardware resources in the traditional photovoltaic power generation system are reused to the maximum extent to construct the automatic cleaning device for the photovoltaic cell panel, so that the investment of extra resources is reduced, and the cost is reduced.
As shown in fig. 1, the components of the conventional photovoltaic power generation system include a communication switchboard and a plurality of photovoltaic inverters with the same structure, wherein:
the photovoltaic inverter comprises an inverter main circuit 100 and an inverter controller 200; the input end of each main inverter circuit 100 is independently connected with a plurality of photovoltaic strings (the photovoltaic strings are formed by connecting a plurality of solar panels in series), and the output ends of all the main inverter circuits 100 are connected with a power grid in parallel; in practical application, in order to reduce cable connection at the output end of the main inverter circuit 100, improve system reliability, and facilitate construction and maintenance, an ac combiner cabinet is generally required to be additionally arranged at the output end of the main inverter circuit 100, as shown in fig. 1;
the inverter controller 200 is configured to control the inverter main circuit 100 to convert a direct current output by the photovoltaic string accessed by the inverter main circuit into an alternating current;
the communication switchboard is in communication connection with each inversion controller 200 to overall plan the inversion operation state of each path of photovoltaic inverter; the communication connection mode between the communication switchboard and each inverter controller 200 generally adopts RS-485 communication.
Based on the photovoltaic power generation system shown in fig. 1, the embodiment of the invention discloses the photovoltaic power generation system shown in fig. 2, which is specifically described as follows:
in fig. 2, a cleaning device actuator corresponding to each path of photovoltaic inverter is added, the cleaning device may be a cleaning robot actuator or a water cleaning device actuator, but is not limited thereto, and fig. 2 only uses the water cleaning device actuator as an example;
the improved photovoltaic inverters have the same structure, and specifically, the photovoltaic inverter further comprises a switching power supply 300, the switching power supply 300 takes power from the main inverter circuit 100, the power output end of the switching power supply 300 is connected to the power interface of the cleaning device executing mechanism corresponding to the photovoltaic inverter, and the control end of the switching power supply 300 is connected to the inverter controller 200;
the inversion controller 200 is used for calculating the next best cleaning date of the photovoltaic string connected to the photovoltaic inverter of the current path, reporting the calculated date to the communication switchboard, controlling the switching power supply 300 to supply power to the outside when receiving a cleaning instruction issued by the communication switchboard, and starting cleaning the photovoltaic string connected to the photovoltaic inverter of the current path by the cleaning device executing mechanism corresponding to the photovoltaic inverter of the current path at the moment; the communication switchboard is used for comprehensively planning the cleaning work of the actuating mechanisms of the cleaning devices, for example, a cleaning instruction is issued to the inverter controller when the time reaches the date calculated by the inverter controller 200, and the communication switchboard can also adjust the time for issuing the cleaning instruction according to the requirement.
As can be seen from the above description, in the embodiment of the present invention, the inverter controller 200 is reused as the cleaning controller, and the power supply of the cleaning device actuator is changed to be directly powered from the inverter main circuit 100 by the switching power supply 300, and the related data transmission in the cleaning function is also directly completed by using the existing communication system in the photovoltaic power generation system, so that the use of one controller, one power supply and one set of communication system is omitted, the effective use of the photovoltaic power station and the automatic cleaning device on software and hardware resources is realized, and the cost is reduced.
Secondly, the embodiment of the invention also provides a concept of cleaning the distributed power station, the cleaning work of the solar panel of the whole photovoltaic power station is carried out by regions, and all photovoltaic group strings connected to one photovoltaic inverter are taken as a cleaning region, so that the cleaning operation can be carried out in a targeted manner according to different cleaning requirements of each cleaning region, the granularity of the cleaning region is increased, and the flexibility is increased.
Moreover, due to the influence of natural condition changes, the cleaning date of the solar cell panel is uncertain every time, and in order to avoid the phenomenon that the cleaning is too frequent or not timely, the inverter controller 200 reasonably judges the next best cleaning date in the embodiment of the invention, so that the condition that the cleaning time arrangement is unreasonable is avoided.
The switching power supply 300 has a basic function of converting a voltage obtained from the inverter main circuit 100 into a power supply voltage required for an actuator of the cleaning apparatus. The switching power supply 300 in the embodiment of the present invention may be a dc switching power supply or an ac switching power supply, depending on whether the cleaning device actuator is a dc powered device or an ac powered device.
Optionally, the inverter controller 200 calculates the next best cleaning date, specifically: the inversion controller 200 acquires voltage and current data of the photovoltaic inverter of the road all day, performs cluster dust loss detection by using a big data analysis algorithm, and calculates the day on which the maximum profit can be obtained as the next best cleaning date of the photovoltaic cluster connected to the photovoltaic inverter of the road according to the cluster dust loss and local meteorological data.
Optionally, each inverter controller in the photovoltaic power generation system shown in fig. 1 is also in communication connection with a cloud. Correspondingly, the photovoltaic power generation system shown in fig. 2, which uses the big data analysis algorithm to perform the string dust loss detection, may also be transferred to the cloud end to complete the detection, that is: the inversion controller 200 packs the voltage and current data of the photovoltaic inverter of the road all day and uploads the voltage and current data to the cloud, the cloud calculates the dust loss degree of the cluster by using a big data analysis algorithm, and sends the calculated dust loss degree of the cluster to the corresponding inversion controller 200, and then the inversion controller 200 calculates the day capable of obtaining the maximum profit as the next best cleaning date of the photovoltaic cluster connected to the photovoltaic inverter of the road according to the dust loss degree of the cluster and the local meteorological data.
Certainly, the cloud can also be used as a monitoring platform to monitor the inversion work of the whole photovoltaic power generation system and simultaneously monitor the cleaning work of the whole photovoltaic power generation system. The staff utilizes mobile terminal and high in the clouds communication, can monitor whole photovoltaic power generation system's contravariant, cleaning work anytime and anywhere.
Optionally, in any one of the photovoltaic power generation systems disclosed above in the embodiments of the present invention, it is recommended that the cleaning device execution mechanism is a water cleaning device execution mechanism, and all the water cleaning device execution mechanisms together form a spraying pipe network, as shown in fig. 2;
the spraying pipe network comprises a main pipe 10 and a plurality of branch spraying pipes 20 branched from the main pipe 10; a water pump is arranged on the main pipeline 10; each branch spraying pipeline 20 is provided with an electromagnetic valve 30 for controlling the on-off of the branch; each branch spraying pipeline 20 is respectively responsible for cleaning all photovoltaic group strings connected to one photovoltaic inverter;
the electric energy output end of the switching power supply 300 is connected to the electromagnetic valve 30 corresponding to the photovoltaic inverter, the branch spraying pipeline 20 where the electromagnetic valve 30 is located is opened after the electromagnetic valve is powered on, the water pump can send the water in the water tank to the opened branch spraying pipeline 2, and then the water is sprayed to all photovoltaic group strings connected to the photovoltaic inverter through the spray head at the front end to be cleaned.
Optionally, when the spraying pipe network is adopted, the communication switchboard is configured to issue a cleaning instruction to the inverter controller whose time reaches the date calculated by the inverter controller 200, and in order to achieve a better spraying effect, the communication switchboard only issues a cleaning instruction to one inverter controller 200 at the same time.
Specifically, the inverter controller 200 sets the self-state flag to a first preset value (for example, set to 1) when the time reaches the self-calculated date, and sets the self-state flag to a second preset value (for example, set to 0) when the time does not reach the self-calculated date or when the photovoltaic string connected to the photovoltaic inverter is completely cleaned. The communication switchboard selects the inverter controller with the highest priority from the inverter controllers 200 with the status flag bit of the current day being the second preset value, and issues a cleaning instruction.
Taking the first preset value as 1 and the second preset value as 0 as an example, the communication switchboard specifically comprises: when the state flag bits of all the inverter controllers 200 are detected to be 0 on the same day, no cleaning instruction is issued; when detecting that only one inverter controller 200 has a status flag bit of 1 on the same day, issuing a cleaning instruction to the inverter controller 200 with the status flag bit of 1; when the condition flag bits of a plurality of inverter controllers 200 are 1 at the same day, a cleaning instruction is sent to one inverter controller 200 with the highest priority, the inverter controller 200 receiving the cleaning instruction sets the condition flag bit of the inverter controller to 0 after the photovoltaic string connected to the photovoltaic inverter of the current path is cleaned, and at the moment, the communication switchboard can detect a new inverter controller 200 with the highest priority and send the cleaning instruction, so that the photovoltaic string in the next area can be cleaned after the photovoltaic string in one area is cleaned.
The inverter controller with the highest priority is selected from the inverter controllers 200 with the current status flag bit being the second preset value, for example, the inverter controller with the smallest ID in the inverter controllers 200 with the current status flag bit being the second preset value.
Optionally, the spraying pipe network further comprises a frequency converter; correspondingly, the communication switchboard is used for controlling the frequency converter to carry out pressure regulation and frequency modulation on the water pump when issuing the cleaning instruction, so that the consistency of the spray washing water pressure of the photovoltaic group strings in each region is ensured.
Corresponding to the system embodiment, the embodiment of the invention also discloses a cleaning control method of the photovoltaic power generation system. The photovoltaic power generation system comprises a communication switchboard and a plurality of photovoltaic inverters with the same structure, each photovoltaic inverter comprises an inverter main circuit and an inverter controller, the input of each inverter main circuit is independent, the output of each inverter main circuit is connected in parallel, and the communication switchboard is in communication connection with each inverter controller; in addition, the photovoltaic power generation system also comprises cleaning device executing mechanisms which are arranged in one-to-one correspondence with the photovoltaic inverters; the photovoltaic inverter also comprises a switch power supply, the switch power supply obtains electricity from the inverter main circuit, the electric energy output end of the switch power supply is connected to the power interface of the cleaning device executing mechanism corresponding to the photovoltaic inverter, and the control end of the switch power supply is connected to the inverter controller.
As shown in fig. 3, the method for controlling cleaning of a photovoltaic power generation system includes:
step S01: the inversion controller calculates the next optimal cleaning date of the photovoltaic string connected to the photovoltaic inverter of the current path;
step S02: reporting the calculated date to the communication switchboard;
step S03: and when receiving a cleaning instruction sent by the communication switchboard, controlling the switching power supply to supply power to the outside.
Optionally, each inverter controller in the photovoltaic power generation system is in communication connection with a cloud, and at this time, the photovoltaic power generation system cleaning control method is as shown in fig. 4, and specifically includes:
step S11: the inversion controller packs voltage and current data of the photovoltaic inverter all day long and uploads the voltage and current data to the cloud end, the cloud end calculates the cluster dust loss degree by using a big data analysis algorithm, and the calculated cluster dust loss degree is issued to the inversion controller;
step S12: and calculating the day capable of obtaining the maximum profit as the next best cleaning date of the photovoltaic string connected on the photovoltaic inverter of the current path according to the received string dust loss degree and the local meteorological data.
Step S13: reporting the calculated date to the communication switchboard;
step S14: and when receiving a cleaning instruction sent by the communication switchboard, controlling the switching power supply to supply power to the outside.
Optionally, all the cleaning device actuators form a spraying pipe network together;
the spraying pipe network comprises a main pipeline provided with a water pump and a plurality of branch spraying pipelines with electromagnetic valves which are branched from the main pipeline, and each branch spraying pipeline is respectively responsible for cleaning a photovoltaic group string connected to one photovoltaic inverter;
the electric energy output end of the switching power supply is connected to a pipeline valve corresponding to the photovoltaic inverter in the circuit;
correspondingly, the cleaning control method of the photovoltaic power generation system further comprises the following steps:
and the communication switchboard issues a cleaning instruction to the inverter controllers with the time reaching the date calculated by the inverter controllers, and only one inverter controller is issued with the cleaning instruction at the same time.
Optionally, the spraying pipe network further comprises a frequency converter; correspondingly, the cleaning control method of the photovoltaic power generation system further comprises the following steps:
and the communication switchboard is used for controlling the frequency converter to regulate and modulate the pressure and the frequency of the water pump while issuing a cleaning instruction.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other. The method disclosed by the embodiment corresponds to the system disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the system part for description.
In this document, relational terms such as first and second, and the like may be 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. Also, 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, the use of the verb "comprise a" to define an element does not exclude the presence of another, identical element in a process, method, article, or apparatus that comprises the element.
Those of skill would further appreciate that the various illustrative elements and algorithm steps described in connection with the embodiments disclosed herein may be implemented as electronic hardware, computer software, or combinations of both, and that the various illustrative components and steps have been described above generally in terms of their functionality in order to clearly illustrate this interchangeability of hardware and software. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
It will be understood by those skilled in the art that all or part of the processes of the methods of the embodiments described above can be implemented by a computer program, which can be stored in a computer-readable storage medium, and when executed, can include the processes of the embodiments of the methods described above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), or the like.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the embodiments. Thus, the present embodiments are not intended to be limited to the embodiments shown herein but are to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A photovoltaic power generation system comprises a communication switchboard and a plurality of photovoltaic inverters with the same structure; the photovoltaic inverter comprises inverter main circuits and an inverter controller, wherein the input end of each inverter main circuit is independently connected with a photovoltaic group string, the output end of each inverter main circuit is connected with a power grid in parallel, and the inverter controller is used for controlling the inverter main circuits to convert direct current output by the photovoltaic group strings connected with the inverter main circuits into alternating current; the communication switchboard is in communication connection with each inversion controller and is used for overall planning the inversion running state of each path of photovoltaic inverter; the method is characterized in that:
the photovoltaic power generation system also comprises cleaning device executing mechanisms which are arranged in one-to-one correspondence with the photovoltaic inverters;
the photovoltaic inverter also comprises a switching power supply, the switching power supply obtains electricity from the inverter main circuit, the electric energy output end of the switching power supply is connected to a power interface of a cleaning device executing mechanism corresponding to the photovoltaic inverter, and the control end of the switching power supply is connected to the inverter controller;
the inversion controller is used for calculating the next best cleaning date of the photovoltaic group string connected to the photovoltaic inverter of the current path, reporting the calculated date to the communication switchboard, and controlling the switching power supply to supply power to the outside when receiving a cleaning instruction issued by the communication switchboard.
2. The photovoltaic power generation system of claim 1, wherein each inverter controller in the photovoltaic power generation system is in communication connection with a cloud;
correspondingly, the inverter controller is specifically used for packaging and uploading voltage and current data of the photovoltaic inverter of the current path throughout the day to a cloud end, calculating the dust loss degree of the string by using a big data analysis algorithm through the cloud end, and sending the calculated dust loss degree of the string to the inverter controller; and then the inverter controller calculates the day capable of obtaining the maximum profit as the next best cleaning date of the photovoltaic string connected on the photovoltaic inverter according to the string dust loss degree and the local meteorological data.
3. The photovoltaic power generation system of claim 1 or 2, wherein all cleaning device actuators together form a spray pipe network;
the spraying pipe network comprises a main pipeline provided with a water pump and a plurality of branch spraying pipelines with electromagnetic valves which are branched from the main pipeline, and each branch spraying pipeline is respectively responsible for cleaning a photovoltaic group string connected to one photovoltaic inverter;
and the electric energy output end of the switching power supply is connected to the pipeline valve corresponding to the photovoltaic inverter.
4. The photovoltaic power generation system of claim 3, wherein the communication switchboard is reused to issue the cleaning command to the inverter controllers whose time reaches the date calculated by the inverter controller, and only one inverter controller is issued with the cleaning command at the same time.
5. The photovoltaic power generation system according to claim 4, wherein the inverter controller sets the self-state flag to a first preset value when the time reaches the self-calculated date, and sets the self-state flag to a second preset value when the time does not reach the self-calculated date or when the photovoltaic string connected to the local photovoltaic inverter is completely cleaned;
and the communication switchboard screens out one inverter controller with the highest priority from the inverter controllers with the current state flag bit of the second preset value, and issues a cleaning instruction.
6. The photovoltaic power generation system of claim 5, wherein the spray network further comprises a frequency converter;
the communication switchboard is used for controlling the frequency converter to regulate and modulate the pressure and the frequency of the water pump while issuing the cleaning instruction.
7. A cleaning control method for a photovoltaic power generation system comprises a communication switchboard and a plurality of photovoltaic inverters with the same structure; the photovoltaic inverter comprises inverter main circuits and an inverter controller, wherein the input end of each inverter main circuit is independently connected with a photovoltaic group string, the output end of each inverter main circuit is connected with a power grid in parallel, and the inverter controller is used for controlling the inverter main circuits to convert direct current output by the photovoltaic group strings connected with the inverter main circuits into alternating current; the communication switchboard is in communication connection with each inversion controller and is used for overall planning the inversion running state of each path of photovoltaic inverter; the method is characterized in that:
the photovoltaic power generation system also comprises cleaning device executing mechanisms which are arranged in one-to-one correspondence with the photovoltaic inverters;
the photovoltaic inverter also comprises a switching power supply, the switching power supply obtains electricity from the inverter main circuit, the electric energy output end of the switching power supply is connected to a power interface of a cleaning device executing mechanism corresponding to the photovoltaic inverter, and the control end of the switching power supply is connected to the inverter controller;
the cleaning control method of the photovoltaic power generation system comprises the following steps:
the inversion controller calculates the next optimal cleaning date of the photovoltaic string connected to the photovoltaic inverter of the current path;
reporting the calculated date to the communication switchboard;
and when receiving a cleaning instruction sent by the communication switchboard, controlling the switching power supply to supply power to the outside.
8. The photovoltaic power generation system cleaning control method according to claim 7, wherein each inverter controller in the photovoltaic power generation system is in communication connection with a cloud;
the inverter controller calculates the next best cleaning date of the photovoltaic string connected to the photovoltaic inverter, and specifically comprises:
the inversion controller packs voltage and current data of the photovoltaic inverter all day long and uploads the voltage and current data to the cloud end, the cloud end calculates the cluster dust loss degree by using a big data analysis algorithm, and the calculated cluster dust loss degree is issued to the inversion controller;
and the inverter controller calculates the day capable of obtaining the maximum profit as the next best cleaning date of the photovoltaic string connected on the photovoltaic inverter according to the received string dust loss degree and the local meteorological data.
9. The photovoltaic power generation system cleaning control method according to claim 7 or 8, wherein all cleaning device actuators together form a spray pipe network;
the spraying pipe network comprises a main pipeline provided with a water pump and a plurality of branch spraying pipelines with electromagnetic valves which are branched from the main pipeline, and each branch spraying pipeline is respectively responsible for cleaning a photovoltaic group string connected to one photovoltaic inverter;
the electric energy output end of the switching power supply is connected to a pipeline valve corresponding to the photovoltaic inverter in the circuit;
the cleaning control method of the photovoltaic power generation system further comprises the following steps:
and the communication switchboard issues a cleaning instruction to the inverter controllers with the time reaching the date calculated by the inverter controllers, and only one inverter controller is issued with the cleaning instruction at the same time.
10. The photovoltaic power generation system cleaning control method according to claim 9, wherein the spray pipe network further comprises a frequency converter;
the cleaning control method of the photovoltaic power generation system further comprises the following steps:
and the communication switchboard is used for controlling the frequency converter to regulate and modulate the pressure and the frequency of the water pump while issuing a cleaning instruction.
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