WO2021190283A1 - 一种光伏***及其通信方法 - Google Patents
一种光伏***及其通信方法 Download PDFInfo
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- WO2021190283A1 WO2021190283A1 PCT/CN2021/079464 CN2021079464W WO2021190283A1 WO 2021190283 A1 WO2021190283 A1 WO 2021190283A1 CN 2021079464 W CN2021079464 W CN 2021079464W WO 2021190283 A1 WO2021190283 A1 WO 2021190283A1
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- 238000004891 communication Methods 0.000 title claims abstract description 84
- 238000000034 method Methods 0.000 title claims abstract description 70
- 230000004044 response Effects 0.000 claims abstract description 108
- 230000000875 corresponding effect Effects 0.000 claims abstract description 49
- 230000008569 process Effects 0.000 claims description 14
- 238000009434 installation Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 8
- 230000009471 action Effects 0.000 description 3
- 230000001174 ascending effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000003993 interaction Effects 0.000 description 2
- 230000004913 activation Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000013480 data collection Methods 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000002452 interceptive effect Effects 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000010248 power generation Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/403—Bus networks with centralised control, e.g. polling
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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
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B3/00—Line transmission systems
- H04B3/54—Systems for transmission via power distribution lines
- H04B3/548—Systems for transmission via power distribution lines the power on the line being DC
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/02—Details
- H04L12/12—Arrangements for remote connection or disconnection of substations or of equipment thereof
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40039—Details regarding the setting of the power status of a node according to activity on the bus
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/40—Bus networks
- H04L12/40006—Architecture of a communication node
- H04L12/40045—Details regarding the feeding of energy to the node from the bus
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/423—Loop networks with centralised control, e.g. polling
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
- H04L12/00—Data switching networks
- H04L12/28—Data switching networks characterised by path configuration, e.g. LAN [Local Area Networks] or WAN [Wide Area Networks]
- H04L12/42—Loop networks
- H04L12/427—Loop networks with decentralised control
- H04L12/43—Loop networks with decentralised control with synchronous transmission, e.g. time division multiplex [TDM], slotted rings
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- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5429—Applications for powerline communications
- H04B2203/5445—Local network
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B2203/00—Indexing scheme relating to line transmission systems
- H04B2203/54—Aspects of powerline communications not already covered by H04B3/54 and its subgroups
- H04B2203/5462—Systems for power line communications
- H04B2203/547—Systems for power line communications via DC power distribution
Definitions
- the invention belongs to the technical field of photovoltaic grid-connected power generation, and more specifically, relates to a photovoltaic system and a communication method thereof.
- the 2017 U.S. Electrotechnical Act puts forward a requirement for rapid shutdown of photovoltaic systems, which requires that the voltage between any conductor and the ground within 1 foot of the photovoltaic array after the shutdown protection does not exceed 80V.
- Figure 1 is a schematic diagram of the communication data flow of this solution, that is, changes over time.
- This method combines the communication method of the host's name-calling and the slave response with the heartbeat protection mechanism. It can realize the two-way communication between the slave and the host while satisfying the heartbeat protection.
- the data collection of the slave can be realized in the system, such as voltage, current and Temperature, etc.; however, the use of the host's active query method causes the host to occupy more bus bandwidth.
- the purpose of the present invention is to provide a photovoltaic system and a communication method thereof, which are used for data transmission in a manner that the slave actively reports and the master responds, so that the master occupies less bus bandwidth.
- the first aspect of the present invention discloses a communication method for a photovoltaic system.
- a host computer is in communication with each slave machine, and each photovoltaic module outputs electric energy through the corresponding slave machine;
- the communication method includes:
- the slave sends a report signal to the host, and listens to the response signal of the host;
- the corresponding slave performs corresponding actions according to the response signal.
- the method further includes:
- the corresponding slave disconnects itself to disconnect the power output path of the corresponding photovoltaic module.
- the sending of a report signal from the slave to the master includes:
- Each of the slaves sends a report signal to the master one by one according to the reporting order of the preset list.
- the slave sending a report signal to the host and detecting the response signal of the host includes:
- Each of the slaves sends the report signal to the host one by one according to the report order of the preset list, and respectively listens to the response signal after sending the report signal.
- the slave sending a report signal to the host and detecting the response signal of the host includes:
- Each of the slaves sends the report signal to the master one by one according to the report order of the preset list
- each of the slaves After each of the slaves completes sending the report signal to the host, each of the slaves listens to the response signal together.
- the process of the host sending the response signal includes: the host sends a start command to each of the slaves Answer the signal to enable each of the slaves; or,
- the slave machine Before the slave machine sends a report signal to the master, it further includes: after the photovoltaic system is started, the master sends a start signal to each of the slaves until each of the slaves is turned on.
- the method before the host sends the response signal carrying the start command to each of the slaves, the method further includes:
- the host determines whether it meets the sending conditions of the response signal carrying the start command according to each of the report signals; if it meets the sending conditions of the response signal carrying the start command, the host sends the start command Answer the signal.
- the host determining whether it meets the sending condition of the response signal carrying the start command includes:
- the host computer calculates the sum of the voltage of each photovoltaic module according to the voltage of the corresponding photovoltaic module carried in each of the report signals, and determines whether the sum of the voltage of each photovoltaic module reaches the photovoltaic system The starting voltage of the mid-inverter;
- the report signal includes: own status information and/or own number.
- the response signal is a modulated signal
- the response signal is a simple signal that characterizes success/failure
- the response signal is an analog signal
- the response signal is a combined signal composed of a report signal of any one of the slaves and a corresponding simple signal representing success/failure.
- the photovoltaic system after the photovoltaic system is started, it further includes:
- the host updates the preset list in each of the slaves.
- the photovoltaic system after the photovoltaic system is installed, it further includes:
- the host sends the preset list to each of the slaves, so that the preset list is set in each of the slaves.
- the second aspect of the present invention discloses a photovoltaic system, including: a DC bus, at least one inverter, at least one master, N slaves, and N photovoltaic modules, where N is a positive integer;
- each slave machine The output ends of each slave machine are cascaded; the input ends of each slave machine are respectively connected to the output ends of each photovoltaic module in a one-to-one correspondence;
- the positive and negative poles of the cascaded slaves are connected to the DC side of the inverter through the DC bus;
- the host is in communication connection with each of the slaves
- the master and each of the slaves are used to execute the communication method of the photovoltaic system according to any one of the first aspect of the present invention.
- the slave machine is a shutdown device or an optimizer in the photovoltaic system.
- the host is a controller inside the inverter, and a communication connection between the host and each of the slaves is achieved through power line carrier communication or wireless communication; or,
- the host is: an independent controller that is set on the DC bus and communicates with each of the slaves through power line carrier communication; or,
- the master is an independent controller that realizes a communication connection with each of the slaves through wireless communication.
- the communication method of the photovoltaic system includes: each slave sends a report signal to the master, and listens to the response signal of the master; if at least one slave receives the response signal, the corresponding slave The machine executes corresponding actions according to the response signal; thus, the communication between the master and each slave is realized in the form of each slave actively sending a report signal, which avoids the master from adopting a roll call method and reduces the host’s response to bus resources. Occupied.
- Fig. 1 is a schematic diagram of communication data flow of an optimizer-based PLC communication method provided in the prior art
- Figure 2 is a schematic structural diagram of a photovoltaic system provided by an embodiment of the present invention.
- FIG. 3 is a flowchart of a photovoltaic system communication method provided by an embodiment of the present invention.
- FIG. 4 is a flowchart of another photovoltaic system communication method provided by an embodiment of the present invention.
- FIG. 5 is a schematic diagram of communication data flow of a photovoltaic system communication method provided by an embodiment of the present invention.
- FIG. 6 is a schematic diagram of communication data flow of a photovoltaic system communication method provided by an embodiment of the present invention.
- Fig. 7 is a schematic structural diagram of another photovoltaic system provided by an embodiment of the present invention.
- Fig. 8 is a schematic structural diagram of another photovoltaic system provided by an embodiment of the present invention.
- the terms “include”, “include” or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes no Other elements clearly listed, or also include elements inherent to this process, method, article, or equipment. If there are no more restrictions, the element defined by the sentence “including a" does not exclude the existence of other identical elements in the process, method, article, or equipment that includes the element.
- the embodiment of the present invention provides a communication method for a photovoltaic system, which is used to solve the problem that the query signal used by the master to query each slave in the prior art needs to carry the communication address of the corresponding slave, which causes the master to occupy more bus bandwidth. .
- FIG. 2 shows a schematic structural diagram of a photovoltaic system.
- the host 104 is communicatively connected with each slave 102, and each photovoltaic module 101 outputs electric energy through the corresponding slave 102.
- the communication method of the photovoltaic system includes:
- Each slave sends a report signal to the host, and listens to the response signal sent by the host.
- the response signal can be a simple signal that characterizes success/failure, that is, the response signal of the host is only used to characterize success/failure, and does not need to include the communication address information of the target communication slave. Therefore, the amount of data is relatively small. , Less broadband occupancy; it can also be a signal that carries commands such as turning on, turning off and obtaining information; it can also be a combined signal composed of any slave's report signal and its corresponding simple signals that characterize success/failure;
- the specific structure of the response signal is not specifically limited here, and it depends on the actual situation, and all are within the protection scope of the present application.
- the response signal can be an analog signal or a modulated signal; when the response signal is a signal of a different form, the composition content of the corresponding response signal is also different. Specifically, if the response signal is an analog signal, the response signal is the above-mentioned combined signal, that is, the response signal includes the report signal of any slave and its corresponding simple signal representing success/failure; if the response signal is a modulated signal, the response The signal is a simple signal that characterizes success/failure.
- the slave when the response signal is a modulated signal, such as a power line carrier signal or a wireless communication signal, the slave only needs the master's response signal to confirm the status of the master, and there is no need to use the signal combination reported by the slave to report the master's response. , That is, the response signal is a simple signal that characterizes success/failure.
- the response signal is an analog signal, it will be safer for the slave to use a combination of the reported signal of any slave and its corresponding simple signal that characterizes success/failure to make judgments, that is, the response signal is a combined signal.
- each slave to send a report signal to the master can be: each slave sends a report to the master one by one according to the reporting order of the preset list, or it can be other devices that can realize that each slave sends a report to the master one by one.
- the method of the signal such as reporting one by one at random, or reporting one by one in a change order, will not be repeated here, and they are all within the protection scope of this application.
- the preset list in each slave machine is configured by the master.
- the preset list is sent to each slave, so that each slave is stored in the preset list; that is, the master and each slave have the above preset list, and the preset list of the master and each slave is Consistent to ensure that all slaves in the photovoltaic system send report signals to the host in an orderly manner.
- the first slave sends a report signal to the master first
- the second slave sends a report signal to the master after the first slave sends a report to the master
- so on such as the first slave first sends a report to the master Send a report signal
- the nth slave sends a report signal to the master after the n-1th slave sends a report to the master
- n is the number of slaves.
- reporting order of the preset list can be arranged in ascending order, or in ascending order, that is, each slave machine can be in descending order of report.
- the reporting can also be done in ascending order of reporting, or can be reported in a random order, which is not specifically limited here, and all are within the protection scope of this application.
- the preset list is described in the order from smallest to largest, and the preset list is shown in Table 1.
- the first slave in the reporting order is slave A
- the second slave in the reporting order is slave B
- the third slave in the reporting order is slave C
- the reporting order The Nth slave is slave X
- the slave number is a unique number set at the factory, that is, the slave number can be used as the identity of the slave.
- each slave and the host can be that after each slave sends a report signal to the host, it listens to the response signal.
- the communication data flow is shown in Figure 5; it can also be that each host sends a report signal to the host. After that, they listen to the response signal together, and the communication data flow is shown in Fig. 6; the interaction mode used by each slave and the host is not specifically limited here, and it is all within the protection scope of this application.
- the above reported signal includes: its own status information such as voltage, current, temperature, etc., and/or its own serial number, that is, the slave serial number.
- step S102 is executed.
- the slave that receives the response signal executes a corresponding action according to the response signal.
- the action performed by the slave corresponds to the content in the response signal. If the response signal is a simple signal that characterizes success/failure, when the response signal indicates success, the slave device remains open; when the response signal indicates failure, the slave device Off.
- the actions of the slave and the content of the response signal are not limited to the above-mentioned corresponding relationship, and will not be repeated here, and they are all within the protection scope of this application.
- the response signal is another type of signal
- the corresponding relationship between the specific content of the response signal and the execution action will not be repeated here, and it depends on the actual situation, and they are all within the protection scope of the present application.
- each slave sends a report signal to the master, and listens to the response signal sent by the master; if at least one slave receives the response signal, the corresponding slave performs the corresponding action based on the response signal; thus, each slave takes the initiative Send the report signal to realize the communication between the master and each slave.
- the query frame sent by the host includes not only query commands or control commands, but also the address information of the target communication slave; in this application, the host does not actively send query frames. It only responds after receiving the report signal from the slave, which reduces the master's occupation of bus resources.
- the response signal of the host is only used to characterize success/failure, and there is no need to carry the communication address of each slave. Therefore, the occupation of bus resources by the host is further reduced.
- step S103 is executed.
- the slave that has not received the response signal within the preset time disconnects itself, so as to disconnect the electric energy output path of the corresponding photovoltaic module.
- the corresponding photovoltaic module cannot output electric energy. Therefore, the rapid shutdown of the photovoltaic system is realized and the safety of the photovoltaic system is improved.
- the corresponding slave disconnects itself, so that the power output path of the corresponding photovoltaic module is disconnected.
- the slave is quickly shut down to reduce the voltage of the DC bus in the photovoltaic system, avoiding the problem of aggravating the photovoltaic system failure due to the excessive voltage of the DC bus, and improving the safety and reliability of the photovoltaic system.
- the above-mentioned slaves send report signals to the master one by one according to the report order of the preset list, and the specific process of listening to the response signal is in a variety of situations, specifically:
- each slave sends a report signal to the master one by one according to the reporting order of the preset list
- the specific process of listening to the response signal is: each slave sends to the master one by one according to the reporting order of the preset list Report the signal, and listen to the response signal respectively after sending the report signal.
- slave 1 reports that slave 1 sends a report signal to the master
- the subsequent master response means that the master responds with a response signal after receiving the report signal from slave 1
- Slave 2 reports that slave 2 detects the corresponding response signal and sends a report signal to the master
- the subsequent master response means that the master responds to the response signal after receiving the report signal from slave 2
- slave N Reporting means that the slave N monitors the corresponding response signal and sends a report signal to the master.
- the subsequent master response means that the master responds with the reply signal after receiving the report signal from the slave N, where N is the number of slaves in the photovoltaic system.
- each slave and the master repeat the above steps.
- any slave sends a report signal to the master
- the next slave continues to send the report signal to the master; for example, in the slave 1
- the slave 2 continues to send the report signal to the master.
- the next slave continues to send a report signal to the master to avoid interruption of the communication of each slave.
- the master can respond uniformly after each slave sends the report signal, and no longer responds to the messages of each slave one by one; That is, each slave sends a report signal to the master one by one according to the reporting order of the preset list, and the specific process of listening to the response signal is: each slave sends a report signal to the master one by one according to the reporting order of the preset list; After finishing sending the report signal to the master, all slaves listen to the response signal together.
- slave 1 reports that is, slave 1 sends a report signal to the master
- slave 2 reports that is, slave 2 sends a report signal to the master
- the slave N sends a report signal to the master.
- the slave N reports that is, after all the slaves report.
- all the slaves listen to the response signal together, and the master responds with the response signal.
- each slave and master repeat the above steps.
- the host sends a preset list to each slave, so that each slave is provided with a preset list.
- the host receives the report signal from each slave, and the report signal includes their respective numbers.
- the host summarizes and sorts the numbers of all the slaves according to a preset program or external input to obtain See the preset list shown in Table 1, and then send the preset list to each slave.
- the photovoltaic system after the photovoltaic system is started, it also includes: the master updates the preset list in each slave.
- each slave and the master have a preset list. Therefore, the master can update the preset list of each slave by updating its own preset list. For example, after the master updates its own preset list, the The machine sends the updated preset list. After each slave receives the updated preset list from the master, it updates its own preset list; the specific process of this step is not limited to the above process, and can realize the preset list in each slave.
- the update process is within the protection scope of this application, and will not be repeated here. For example, when the number of the slave machine in the photovoltaic system changes, such as adding some slave machines or replacing some slave machines, the master will update its own preset list and send the preset list to each slave machine.
- the host sends the latest preset list stored by itself to each slave, depending on the actual situation, and all are within the protection scope of this application.
- each slave needs to control each slave to turn on, so that each photovoltaic module can realize electric energy output; after that, each slave can start to send a report signal to the host normally, such as periodically reporting its own Various status parameters, etc.
- the specific method for controlling the activation of each slave machine may depend on its application environment. In this embodiment, the following two optional methods are provided:
- the host After the photovoltaic system is started, the host starts to send a start signal to each slave until each slave is turned on. That is: first, the host sends a start signal to each slave; if the voltage of each photovoltaic module is always low, such as when the irradiance is insufficient in the morning, the host will continue to send the start signal according to its own predetermined period; As the irradiance increases, the voltage of each photovoltaic module gradually rises, and each slave is turned on according to the start signal to enable the corresponding photovoltaic module to realize electrical energy output.
- each slave machine After the photovoltaic system is started, each slave machine actively detects the voltage of the photovoltaic module and reports it. When the voltage of each photovoltaic module is high enough, the master will control each slave machine to turn on. That is: first, each slave device actively detects the voltage of the photovoltaic module connected to itself (ie its own input voltage), and then reports the voltage of the corresponding photovoltaic module to the host through the report signal; the host computer carries it according to each report signal.
- the startup of the photovoltaic system in the above content means that there are no other faults in the photovoltaic system other than the undervoltage of the DC bus, such as overvoltage and undervoltage of the grid, overvoltage and underfrequency of the grid voltage, and manual quick shutdown by pressing If the button is faulty, the photovoltaic system allows each slave to be turned on to enable each photovoltaic module to achieve electrical energy output.
- the communication function of the corresponding master is also activated; if each slave has been powered on, that is, there is auxiliary power supply, the communication function of each slave is activated; and if each slave has not been powered on, there is no auxiliary When power is supplied, the communication function of each slave is not activated.
- the host will continue to send the start signal regardless of whether each slave is powered on; that is, when the host sends the start signal to each slave, if Each slave does not respond, for example, the auxiliary power supply of each slave is disconnected at night, and each slave fails to respond after the master sends a start signal to each slave, then the master continues to send the start signal until each slave has auxiliary power supply and photovoltaic Turn on when the module voltage is sufficient.
- the master waits for each slave to be powered on. For example, after each slave has auxiliary power supply during the day, each slave actively detects the photovoltaic module voltage and sends a report signal, and then if the corresponding conditions are met , The host sends a response signal carrying the start command to enable each slave.
- This implementation manner can avoid that when each slave fails to respond for a long time, such as at night, the host continues to send the sending start signal for a long time; therefore, the implementation manner described in (2) is preferred.
- the sending condition of the response signal carrying the start command may also be: the number or proportion of the reported signal is received, and at least one of the communication success rates of each slave machine meets the corresponding preset condition; no further description is given here. , Depends on its application environment, and all are within the protection scope of this application.
- the embodiment of the present invention provides a photovoltaic system, see Figure 2, Figure 7 and Figure 8, including: DC bus 103, at least one inverter 105, at least one host 104, N slaves 102 and N photovoltaic modules 101 , N is a positive integer; where:
- each slave 102 The output of each slave 102 is cascaded; the input of each slave 102 is connected to the output of each photovoltaic module 101 in a one-to-one correspondence; the positive and negative poles of each slave 102 are cascaded with the inverter through the DC bus 103 The DC side of 105 is connected; the host 104 is communicatively connected with each slave 102.
- Each slave 102 and the host 104 constitute a communication system, and the communication content of the communication system includes: information transmission, service query, command control and other interactive operations.
- the slave 102 is a shutdown device or an optimizer in the photovoltaic system.
- the host 104 can be a controller inside the inverter 105 (as shown in FIG. 2), and the host 104 and each slave 102 can communicate with each other through power line carrier communication or wireless communication; the host 104 can also be independent
- the controller does not limit the specific form of the host 104 here, and it depends on the actual situation, and is within the protection scope of the present application.
- the host 104 may be: an independent controller (as shown in FIG. 7) that is set on the DC bus 103 and communicates with each slave 102 through power line carrier communication; the host 104 It can also be an independent controller that realizes communication connection with each slave 102 through wireless communication (as shown in FIG. 8); here, the position of the master 104 in the photovoltaic system is not limited, and it depends on the actual situation. All are within the protection scope of this application.
- the photovoltaic module 101 includes: at least one photovoltaic module; when the photovoltaic module 101 includes one photovoltaic module, the output terminal of the photovoltaic module is connected to the input terminal of the corresponding slave 102; the photovoltaic module 101 includes at least two photovoltaic modules When, the output terminals of each photovoltaic module are connected in parallel, and the connection point is connected with the input terminal of the corresponding slave 102; or, each photovoltaic module is connected in series to form a series branch, and the output terminal of the series branch is connected with the input terminal of the corresponding slave 102; Each photovoltaic module also adopts a connection relationship of series and parallel connection, which will not be repeated here, and they are all within the protection scope of the present application.
- each photovoltaic module 101 stops outputting, and there is no input power on the DC bus 103; when each slave 102 opens its own connection, each photovoltaic module 101 Both can realize electric energy output, and the electric energy on the DC bus 103 is inverted and output by the inverter 105.
- the master 104 and each slave 102 are used to execute the communication method of the photovoltaic system of any of the above embodiments.
- the process and principle of the communication method of the photovoltaic system please refer to the above embodiments for details, and will not be repeated here.
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Abstract
Description
上报顺序 | 从机编号 |
1 | 从机A |
2 | 从机B |
3 | 从机C |
… | … |
N | 从机X |
Claims (15)
- 一种光伏***的通信方法,其特征在于,所述光伏***中,主机与各个从机通信连接,各个光伏模块通过相应的从机进行电能输出;所述通信方法包括:所述从机向所述主机发送上报信号,并侦听所述主机的应答信号;若至少一个所述从机收到所述应答信号,则相应从机依据所述应答信号执行相应动作。
- 根据权利要求1所述的光伏***的通信方法,其特征在于,在所述从机向所述主机发送上报信号之后,还包括:若至少一个所述从机在预设时间内没有收到所述应答信号,则相应所述从机将自身的连接断开,以使相应所述光伏模块的电能输出路径断开。
- 根据权利要求2所述的光伏***的通信方法,其特征在于,所述从机向所述主机发送上报信号包括:各个所述从机按预设列表的上报顺序逐个向所述主机发送上报信号。
- 根据权利要求3所述的光伏***的通信方法,其特征在于,所述从机向所述主机发送上报信号,并侦所述主机的应答信号,包括:各个所述从机按所述预设列表的上报顺序,逐个向所述主机发送所述上报信号,并在发送所述上报信号后分别侦听所述应答信号。
- 根据权利要求3所述的光伏***的通信方法,其特征在于,所述从机向所述主机发送上报信号,并侦所述主机的应答信号,包括:各个所述从机按所述预设列表的上报顺序,逐个向所述主机发送所述上报信号;在各个所述从机均完成向所述主机发送上报信号后,各个所述从机一同侦听所述应答信号。
- 根据权利要求1所述的光伏***的通信方法,其特征在于,各个所述从机开通之前,各个从机向所述主机发送上报信号之后,所述主机发送所述应答信号的过程包括:所述主机向各个所述从机发送携带启动命令的应答信号,使各个所述从机开通;或者,在所述从机向所述主机发送上报信号之前,还包括:在所述光伏***启动后,所述主机向各个所述从机发送启动信号,直至各个所述从机开通。
- 根据权利要求6所述的光伏***的通信方法,其特征在于,所述主机向各个所述从机发送所述携带启动命令的应答信号之前,还包括:所述主机根据各个所述上报信号,判断是否符合所述携带启动命令的应答信号的发送条件;若符合所述携带启动命令的应答信号的发送条件,则所述主机发送所述携带启动命令的应答信号。
- 根据权利要求7所述的的光伏***的通信方法,其特征在于,所述主机判断是否符合携带启动命令的应答信号的发送条件,包括:所述主机根据各个所述上报信号中携带的相应所述光伏模块的电压,计算各个所述光伏模块的电压的和值,并判断各个所述光伏模块的电压的和值是否达到所述光伏***中逆变器的启动电压;若各个所述光伏模块的电压的和值达到所述光伏***中逆变器的启动电压,则判定符合所述携带启动命令的应答信号的发送条件。
- 根据权利要求1-8任一所述的光伏***的通信方法,其特征在于,所述上报信号包括:自身的状态信息和/或自身的编号。
- 根据权利要求1-8任一所述的光伏***的通信方法,其特征在于,若所述应答信号为调制信号,则所述应答信号为表征成功/失败的简单信号;若所述应答信号为模拟信号,则所述应答信号为任一所述从机的上报信号及其对应表征成功/失败的简单信号构成的组合信号。
- 根据权利要求2-8任一所述的光伏***的通信方法,其特征在于,在所述光伏***启动之后,还包括:所述主机对各个所述从机内的预设列表进行更新。
- 根据权利要求11所述的光伏***的通信方法,其特征在于,在所述光伏***安装完成之后,还包括:所述主机向各个所述从机发送所述预设列表,以使各个所述从机内均设置有所述预设列表。
- 一种光伏***,其特征在于,包括:直流总线、至少一个逆变器、至少一个主机、N个从机和N个光伏模块,N为正整数;各个所述从机的输出端级联;各个所述从机的输入端分别与各个光伏模块的输出端一一对应相连;各个所述从机级联后的正负极通过所述直流总线与所述逆变器的直流侧相连;所述主机与各个所述从机通信连接;所述主机和各个所述从机用于执行如权利要求1-12任一所述的光伏***的通信方法。
- 根据权利要求13所述的光伏***,其特征在于,所述从机为所述光伏***中的关断器或优化器。
- 根据权利要求13或14所述的光伏***,其特征在于,所述主机为所述逆变器内部的控制器,所述主机与各个所述从机之间通过电力线载波通信或无线通信的方式实现通信连接;或者,所述主机为:设置于所述直流总线上、通过电力线载波通信与各个所述从机之间实现通信连接的独立控制器;又或者,所述主机为:通过无线通信与各个所述从机之间实现通信连接的独立控制器。
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CN114094934A (zh) * | 2020-08-24 | 2022-02-25 | 丰郅(上海)新能源科技有限公司 | 光伏组件关断模块及关断方法 |
EP4203301A1 (en) * | 2020-08-24 | 2023-06-28 | Fonrich (Shanghai) New Energy Technology Co. Ltd. | Turn-off apparatus for photovoltaic module and turn-off method for photovoltaic module |
CN112017072B (zh) * | 2020-08-26 | 2024-05-14 | 阳光电源(上海)有限公司 | 光伏***、组串内设备的定位方法和mlpe设备及其排序方法 |
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