CN108879958B - Distributed power supply system and communication crosstalk suppression method thereof - Google Patents
Distributed power supply system and communication crosstalk suppression method thereof Download PDFInfo
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- CN108879958B CN108879958B CN201810813159.3A CN201810813159A CN108879958B CN 108879958 B CN108879958 B CN 108879958B CN 201810813159 A CN201810813159 A CN 201810813159A CN 108879958 B CN108879958 B CN 108879958B
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00007—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using the power network as support for the transmission
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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
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00016—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus
- H02J13/00018—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using a wired telecommunication network or a data transmission bus using phone lines
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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
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
Abstract
The invention provides a distributed power supply system and a communication crosstalk suppression method thereof, which are applied to the technical field of communication control.A main controller sends a first instruction to slave equipment in a broadcast mode through wireless communication or power line carrier communication; the slave device analyzes the first instruction; the first characteristic codes are prestored in the slave equipment, and the slave equipment can execute the first instructions only when the slave equipment judges that the analysis result comprises the first characteristic codes, so that the operation control of corresponding power supply equipment is realized, namely, the instructions of the main controllers in different distributed power supply systems are distinguished through different first characteristic codes, and further the problem of communication crosstalk between different distributed power supply systems in the prior art is avoided.
Description
Technical Field
The invention relates to the technical field of communication control, in particular to a distributed power supply system and a communication crosstalk suppression method thereof.
Background
A distributed power system refers to a system having a plurality of power sources, such as a photovoltaic power generation system having a plurality of photovoltaic modules and photovoltaic inverters, or an energy storage system having a plurality of storage batteries and a power control system. A plurality of devices (e.g., power supply devices, monitoring devices, protection devices, etc.) in a distributed power system are generally controlled by a master controller, for example, in a photovoltaic power generation system having a plurality of photovoltaic inverters, all of the photovoltaic inverters are controlled by a master controller (sometimes also referred to as a station controller) to implement power on/off, active/reactive scheduling, etc. In view of the high cost and the high susceptibility of the cable for wired communication, a communication method without a dedicated communication cable, such as wireless communication and power line carrier communication, has been generally adopted in the prior art.
However, since two or more distributed power systems may be installed in a region with a small area, for example, two photovoltaic power generation systems are installed on the tops of two houses with a short distance, there will be a possibility that the main controllers of the two systems send command signals simultaneously in the region. If the wireless communication mode is adopted, since the area covered by the wireless signal is likely to contain devices in other distributed power supply systems, communication crosstalk may be caused, so that one of the distributed power supply systems erroneously receives or executes a signal or an instruction of another system. However, if the power line carrier communication method is adopted, communication crosstalk is also caused by the methods such as spatial radiation due to the antenna effect of the power lines, parasitic parameter coupling between the power lines, and the like, so that the carried signal is received by other power lines.
The influence of communication crosstalk on a broadcast instruction (such as a system crash stop) sent in a broadcast manner with a higher priority is more obvious because the broadcast instruction generally has a uniform format and generally needs to be executed by all devices together, and if a slave device cannot distinguish whether the broadcast instruction is sent by a main controller of the system, the system is likely to be disabled after the broadcast instruction is executed incorrectly, or other more serious consequences such as a safety accident occur.
Disclosure of Invention
The invention provides a distributed power supply system and a communication crosstalk suppression method thereof, which aim to solve the problem of communication crosstalk in the prior art.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
in a first aspect, the present invention provides a method for suppressing crosstalk in communication of a distributed power supply system, where the distributed power supply system includes: a master controller, a plurality of power supply devices, and at least one slave device; the method for suppressing the communication crosstalk of the distributed power system comprises the following steps:
the master controller sends a first instruction to the slave equipment in a broadcast mode through wireless communication or power line carrier communication;
the slave device analyzes the first instruction;
the slave equipment judges whether the analysis result comprises a first feature code or not; the first characteristic code is a code pre-stored in the slave device;
and if the analysis result comprises the first characteristic code, the slave equipment executes the first instruction so as to realize the operation control of the corresponding power supply equipment.
Optionally, after the slave device determines whether the analysis result includes the first feature code, the method for suppressing communication crosstalk in a distributed power supply system according to the first aspect of the present invention further includes:
and if the analysis result does not comprise the first feature code, the slave equipment ignores the first instruction.
Optionally, the first instruction is: the limitation of the output voltage, the output current, or the output power is released, and the system is started or stopped.
Optionally, before the master controller sends the first instruction to the slave device in a broadcast form through wireless communication or power line carrier communication, the method for suppressing communication crosstalk in a distributed power supply system according to the first aspect of the present invention further includes:
the main controller judges whether the first characteristic code is generated or recorded;
if the master controller records the first feature code, the master controller issues the first feature code to the slave device in a broadcast or unicast mode through wireless communication or power line carrier communication, or the slave device records the first feature code in a memory with power failure and data loss before leaving a factory; the first feature code is static code;
if the master controller randomly generates the first feature code according to a preset rule, the master controller issues the first feature code to the slave device in a broadcast or unicast mode through wireless communication or power line carrier communication; the first feature code is a dynamic code.
Optionally, if the master controller records the first feature code, the master controller issues the first feature code to the slave device in a broadcast or unicast manner through wireless communication or power line carrier communication, including:
if the master controller records the first feature code, the master controller issues the first feature code to the slave device in a broadcast mode through wireless communication or power line carrier communication in a system installation and debugging stage;
or, if the master controller records the first feature code, in a system installation and debugging stage, the master controller issues the first feature code to the slave device in a unicast manner through wireless communication or power line carrier communication according to a second feature code of the slave device prestored inside.
Optionally, after the main controller determines whether the first signature code is generated or recorded, the method for suppressing communication crosstalk of a distributed power supply system according to the first aspect of the present invention further includes:
if the master controller does not generate or record the first characteristic code, the master controller sends a second instruction to the slave device in a broadcast mode through wireless communication or power line carrier communication;
the slave device analyzes the second instruction;
the slave equipment judges whether the analysis result comprises a wildcard code or not; the wildcard code is a code pre-stored in the slave device;
and if the analysis result comprises the wildcard code, the slave equipment executes the second instruction to realize the operation control of the corresponding power supply equipment.
In a second aspect, the present invention provides a distributed power system, comprising: a master controller, a plurality of power supply devices, and at least one slave device; wherein:
the master controller is used for sending a first instruction to the slave equipment in a broadcast mode through wireless communication or power line carrier communication;
the slave equipment is used for analyzing the first instruction and judging whether an analysis result comprises a first feature code or not; the first characteristic code is a code pre-stored in the slave device; and if the analysis result comprises the first feature code, executing the first instruction to realize the operation control of the corresponding power supply equipment.
Optionally, the slave device is further configured to: after judging whether the analysis result includes the first feature code, if the analysis result does not include the first feature code, ignoring the first instruction.
Optionally, the first instruction is: the limitation of the output voltage, the output current, or the output power is released, and the system is started or stopped.
Optionally, the power supply device is a photovoltaic module or a storage battery.
Optionally, the main controller is further configured to: judging whether the first characteristic code is generated or recorded before transmitting a first instruction to the slave device in a broadcast form through wireless communication or power line carrier communication; if the first feature code is recorded, the first feature code is issued to the slave device in a broadcast or unicast mode through wireless communication or power line carrier communication, and the first feature code is a static code; if the master controller randomly generates the first feature code according to a preset rule, the first feature code is issued to the slave device in a broadcast or unicast mode through wireless communication or power line carrier communication; the first characteristic code is dynamic code;
or, the slave device is further configured to: if the first characteristic code is recorded in the main controller, the first characteristic code is recorded in a memory with no data loss after power failure before leaving a factory, and the first characteristic code is static code.
Optionally, if the first feature code is recorded, when the master controller is configured to issue the first feature code to the slave device through wireless communication or power line carrier communication, the master controller is specifically configured to:
if the first feature code is recorded, the first feature code is issued to the slave device in a broadcast mode through wireless communication or power line carrier communication in a system installation and debugging stage;
or, if the first feature code is recorded, in a system installation and debugging stage, the first feature code is issued to the slave device in a unicast manner through wireless communication or power line carrier communication according to a second feature code of the slave device prestored inside the system installation and debugging stage.
Optionally, the main controller is further configured to:
after judging whether the first feature code is generated or recorded, if the first feature code is not generated or recorded by the main controller, the main controller sends a second instruction to the slave device through wireless communication or power line carrier communication;
the slave device analyzes the second instruction;
the slave equipment judges whether the analysis result comprises a wildcard code or not; the wildcard code is a code pre-stored in the slave device;
and if the analysis result comprises the wildcard code, the slave equipment executes the second instruction to realize the operation control of the corresponding power supply equipment.
The invention provides a communication crosstalk suppression method of a distributed power supply system, which is characterized in that a main controller sends a first instruction to slave equipment in a broadcast mode through wireless communication or power line carrier communication; the slave equipment analyzes the first instruction; the first characteristic code is prestored in the slave equipment, and the slave equipment can execute the first instruction only when the slave equipment judges that the analysis result comprises the first characteristic code, so that the operation control of corresponding power supply equipment is realized; the main controller instructions in different distributed power systems are distinguished through different first characteristic codes, and therefore the problem of communication crosstalk between different distributed power systems in the prior art is solved.
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 flowchart of a method for suppressing communication crosstalk in a distributed power system according to an embodiment of the present invention;
fig. 2 is a flowchart of a communication crosstalk suppression method of another distributed power system according to an embodiment of the present invention;
fig. 3 is a block diagram of a distributed power supply system according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, 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 application.
Distributed power systems, such as photovoltaic power generation systems or energy storage systems, mainly include: a master controller, a plurality of power supply devices, and at least one slave device. When a plurality of distributed power systems are arranged in a close region, the method for suppressing communication crosstalk of the distributed power systems provided by the embodiment of the invention can be adopted.
A flowchart of a method for suppressing communication crosstalk in a distributed power supply system according to an embodiment of the present invention may be shown in fig. 1, where the method may include:
and S101, the master controller sends a first instruction to the slave device in a broadcast mode through wireless communication or power line carrier communication.
The master controller generally performs centralized control on a plurality of slave devices (such as power supply devices, monitoring devices, protection devices, and the like) in the distributed power supply system, and performs information transmission with each slave device through a communication mode without a dedicated communication cable, such as wireless communication or power line carrier communication, for example, a communication mode such as WIFI, Zigbee, Lora, NB-IoT, direct-current power line carrier, and alternating-current power line carrier.
And the main controller sends a first instruction to the slave equipment in combination with the actual operation condition of the distributed power supply system, so that the slave equipment in the signal transmission range can receive the first instruction, the effective control on the slave equipment and other equipment connected with the slave equipment is realized, and the safe and efficient operation of the distributed power supply system is ensured.
Optionally, for different operating conditions and preset control rules, the master controller needs to send different first instructions to the slave device to control the slave device to execute different actions. The first instruction sent by the master controller to the slave device at least comprises any one of limitation of output voltage, output current or output power, limitation removal of output voltage, output current or output power, start-up and stop.
For example, taking a photovoltaic system with a shutdown device as an example, each photovoltaic module is connected with one shutdown device, and when a fire or other dangerous situation occurs, the main controller is triggered manually to send the command, or the main controller automatically sends a first shutdown command to each shutdown device after actively recognizing the dangerous situation, and further shuts down each photovoltaic module through the shutdown device. Or when the photovoltaic system needs to be overhauled, the main controller sends a first shutdown instruction; after the photovoltaic system is overhauled, the main controller sends a starting first instruction. Or when the system is debugged and certain special safety regulations or function requirements are met, the main controller limits the output voltage, current or power of the distributed power supply; and releasing the limitation of the distributed power supply on the output voltage, the current or the power after the system debugging is finished.
And S102, the slave equipment analyzes the first instruction.
After receiving the first instruction sent by the main controller, the slave device needs to analyze the first instruction to obtain effective information in the first instruction.
It is conceivable that the master controller and the slave device transmit the first instruction in different communication manners, and accordingly, after receiving the first instruction, the slave device needs to analyze the first instruction in an analysis manner corresponding to the communication manner adopted when transmitting the first instruction, so as to accurately obtain the effective information in the first instruction. That is, before the first command is transmitted, a communication method should be preset between the master controller and the slave device, and further, the slave device determines a corresponding analysis method.
Step S103, the slave device judges whether the analysis result comprises the first feature code.
In order to ensure that the slave device can accurately judge whether the received first instruction is from a main controller belonging to the same distributed power system, the communication crosstalk suppression method of the distributed power system provided by the invention adds the first characteristic code in the code of each first instruction sent by the main controller.
Optionally, as described above, the main purpose of setting the first feature code is to ensure that the slave device can accurately determine whether the received first command is from the master controller belonging to the same distributed power system. Therefore, the first signature code may be selected to uniquely represent the main controller, such as a serial number, a factory number, or any other information that can uniquely represent the main controller. Of course, the first signature code may also be selected from other specific information, such as a code randomly generated by the main controller.
Further, no matter what form the first signature code takes, for any distributed power system, the slave device needs to pre-store the first signature code, and determine whether the received first command is from the master controller belonging to the same distributed power system according to the stored first signature code.
Therefore, if the slave device determines that the analysis result includes the pre-stored first feature code, it may be determined that the first command is from the master controller belonging to the same distributed power system, and then step S104 is performed; in contrast, if the slave device determines that the pre-stored first signature code is not included in the analysis result, it may be determined that the first command is from the master controller of another distributed power supply system, and step S105 needs to be performed.
And step S104, the slave device executes the first instruction to realize the operation control of the corresponding power supply device.
After the first instruction is judged to be originated from the main controller belonging to the same distributed power system, the slave device can execute the first instruction, and the operation control of the corresponding power supply device is realized.
Step S105, the slave device ignores the first instruction.
If the slave device determines that the received first command is from the master controller of the other distributed power system, the first command is ignored and is not executed.
According to the method for suppressing communication crosstalk of the distributed power supply system, through the above process, different distributed power supply systems can distinguish the main controller instruction through different first characteristic codes, so that the problem of communication crosstalk between different distributed power supply systems in the prior art is solved.
According to the method for suppressing the communication crosstalk of the distributed power supply system, the main controller instructions in different distributed power supply systems are distinguished through different first feature codes, so that to distinguish the main controller instructions in different distributed power supply systems, slave equipment belonging to the same distributed power supply system needs to acquire the first feature codes in advance.
Based on the premise, the embodiments of the present invention further provide a method for enabling the master controller and the slave device to obtain the first signature code before the master controller sends the first command to the slave device in a broadcast manner through wireless communication or power line carrier communication.
First, the main controller determines whether the first feature code is generated or recorded, and optionally, the main controller may determine whether the first feature code is generated or recorded by reading the content recorded in the internal memory.
Optionally, if the master controller records the first feature code, in a system installation and debugging stage or a stage where other systems are not put into formal operation, the master controller may broadcast the first feature code to each slave device through wireless communication or power line carrier communication, so that each slave device controlled by the master controller obtains the first feature code.
Or, if the main controller records the first feature code, the main controller can send the first feature code to each slave device in a unicast mode through wireless communication or power line carrier communication in a system installation and debugging stage or other stages where the system is not put into formal operation. Specifically, the master controller may obtain the second feature codes of the slave devices by a system networking algorithm (for example, each slave device sends the second feature codes of itself in a random sending manner), or by manually recording the second feature codes of the slave devices, and then entering the master control manner and the like, and further send the first feature codes to the slave devices one by one through wireless communication or power line carrier communication according to the second feature codes of the slave devices, so that each slave device controlled by the master controller obtains the first feature codes respectively.
After receiving the first feature code sent by the master controller, the slave device can store the first feature code in a memory which has no data loss when power is down. Or, before the slave device leaves the factory, namely, the first characteristic code of the master controller is recorded in the memory which has no data loss when the slave device is powered down.
For any main controller, the first feature code mentioned in the above embodiments is fixed, and as described above, it may be that the serial number, factory number, and the like of the main controller can uniquely represent the identification information of the main controller, and since such identification information is fixed and unchangeable, such first feature code is a static code.
It should be noted that, after receiving the first feature code, the slave device stores the first feature code in a memory, such as an EEPROM or a FLASH memory, which has no data loss when power is turned off, and it is necessary to ensure that the first feature code stored for the first time must be correct. Therefore, it is required to determine the matching relationship between the slave device and the master controller before the slave device receives and stores the first signature code, and to arrange the master controller and the slave device in the determined matching relationship strictly at the design stage or the construction stage of the distributed power supply system, so as to avoid that the master controller and the slave device which do not belong to the same matching relationship are provided in the same system, and the slave device stores the wrong first signature code.
Optionally, the first feature code may also be a dynamic code. The master controller randomly generates a first feature code according to a preset rule, for example, the first feature code is randomly generated after starting, the first feature code is changed once (or randomly) after a period of time, or the first feature code is generated or changed according to any recognizable rule of the slave device, then the first feature code is issued to the slave device in a broadcast or unicast mode through wireless communication or power line carrier communication, and the slave device only needs to store the first feature code in the RAM after receiving the first feature code. The dynamic codes are used for distinguishing and identifying the main controller, so that the running safety of the system can be improved, and the condition that the static codes are used maliciously is avoided.
By the method, the slave device can accurately obtain the first feature code of the main controller belonging to the same system, and further judge the source of the instruction according to the first feature code, and only when the slave device judges that the analysis result comprises the first feature code, the slave device can execute the instruction, so that the operation control of the corresponding power supply device is realized.
In practical applications, if the master controller does not generate or record the first feature code, the control of the corresponding slave device may be implemented through steps S201 to S205 as shown in fig. 2, which specifically include:
in step S201, the master controller transmits the second instruction to the slave device in a broadcast manner through wireless communication or power line carrier communication.
Optionally, an optional implementation of step S201 may be as shown in step S101 shown in fig. 1, and is not described here again.
In step S202, the slave device parses the second instruction.
Optionally, an optional implementation of step S202 may be as shown in step S102 shown in fig. 1, and is not described here again.
In step S203, the slave device determines whether the parsing result includes a wildcard code.
In order to implement the method provided by the embodiment of the invention, communication among devices of different manufacturers can be compatible with each other in the same distributed power system, a wildcard code needs to be prestored in a slave device, the wildcard code is different from a first characteristic code of a master controller, the wildcard code can be a universal code appointed by other manufacturers in the industry, and under a special condition, the wildcard code can also be a null code, namely, the wildcard code does not contain any effective information.
After receiving the second instruction sent by the main controller and analyzing the second instruction, the slave device can determine whether the second instruction contains the wildcard code. If the parsing result includes the wildcard code, step S204 is executed, and if the parsing result does not include the wildcard code, step S205 is executed.
In step S204, the slave device executes a second instruction to implement operation control for the corresponding power supply device.
After determining that the second instruction is from the master controller belonging to the same distributed power system, the slave device can execute the second instruction, thereby realizing the operation control of the corresponding power supply device.
In step S205, the slave device ignores the second instruction.
If the slave device determines that the received second instruction is from the master controller of the other distributed power system, the second instruction is ignored and is not executed.
According to the method for suppressing communication crosstalk of the distributed power supply system, the wildcard code is set in the second instruction, and the second instruction of the main controller in different distributed power supply systems is distinguished through the wildcard code, so that the slave device can accurately judge whether to execute the received second instruction, and the problem of communication crosstalk between different distributed power supply systems in the prior art is further solved.
Furthermore, as the wildcard code is adopted to identify the second instruction, the master controller and each slave device in the same distributed power system can be from different manufacturers, so that the universality of the device is improved, and particularly, when a certain slave device breaks down and needs to be replaced, more selection spaces are provided, the device is not limited to the product of the same manufacturer, the system repair time can be effectively shortened, and the working efficiency is improved.
It should be noted that, under the condition that the first feature code is not generated or recorded in the main controller, the issuing, analyzing, judging, executing or ignoring of the second instruction with the wildcard code is realized through steps S201 to S205, so that the problem of mutual interference of communication between different systems can be avoided; once the main controller detects that the first feature code is generated or recorded by itself, the main controller will implement issuing, analyzing, determining, and executing or ignoring the first command with the first feature code through steps S101 to S105, so as to avoid the problem of mutual interference between different systems, as shown in fig. 2. In addition, if the slave equipment is replaced due to failure, the system can be triggered to restart the networking algorithm, so that the newly added slave equipment is incorporated into the photovoltaic system; or manually recording the second characteristic code of the newly added slave equipment, and then recording the second characteristic code into the master controller, so that the newly added slave equipment is incorporated into the photovoltaic system. Then the system switches to steps S201 to S205 again, and the master controller may issue the first feature code to the newly replaced slave device in time according to the specific application environment, so that the whole system can switch to steps S101 to S105 again and apply the first command with the first feature code for control, so as to avoid the communication mutual interference (not shown) that may occur when the adjacent systems meet the same condition and adopt the wildcard code at the same time.
The distributed power system according to the embodiment of the present invention is described below, and the components involved in the distributed power system according to the present invention can implement the functions corresponding to the components mentioned in the method for suppressing crosstalk in communication of the distributed power system, in addition to the original corresponding functions of the components.
Referring to fig. 3, fig. 3 is a structural diagram of a distributed power supply system according to an embodiment of the present invention, and it can be seen from the diagram that the distributed power supply system according to the embodiment of the present invention includes: a master controller 103, a plurality of power supply devices 101 and at least one slave device 102. The inverter 104 and the grid 105 are components related to a photovoltaic power generation system, and the main controller 106 belongs to another distributed power system, which is not elaborated in detail in this section.
The master controller 103 is configured to send a first instruction to the slave device 102 in a broadcast form through wireless communication or power line carrier communication;
the slave device 102 is configured to analyze the first instruction and determine whether an analysis result includes a first feature code; the first feature code is a code pre-stored in the slave device 102; and if the analysis result comprises the first characteristic code, executing a first instruction to realize operation control on the corresponding power supply equipment 101.
In the distributed power supply system provided in the embodiment of the present invention, the slave device 102 prestores the first feature code of the master controller 103, and when the master controller 103 sends the first command for controlling, the first feature code is added to the first command, the slave device 102 analyzes the first command after receiving the first command, and if the first command includes the first feature code, the slave device 102 can determine that the source of the received first command is the same as the master controller 103 in the same distributed power supply system, and can further execute the first command, thereby implementing the operation control of the corresponding power supply device 101. According to the embodiment of the invention, the first instructions of the main controllers in different distributed power systems are distinguished through different first characteristic codes, so that the problem of communication crosstalk between different distributed power systems in the prior art is solved.
Optionally, the slave device 102 is further configured to: after judging whether the analysis result comprises the first feature code, if the analysis result does not comprise the first feature code, the first instruction is ignored.
Optionally, the first instruction is: the limitation of the output voltage, the output current, or the output power is released, and the system is started or stopped.
Optionally, the power supply device 101 is a photovoltaic module or a storage battery.
Optionally, the main controller 103 is further configured to: before transmitting the first instruction to the slave device 102 in a broadcast form through wireless communication or power line carrier communication, determining whether a first signature code is generated or recorded; if the first feature code is recorded, the first feature code is issued to the slave device 102 in a broadcast or unicast mode through wireless communication or power line carrier communication, and the first feature code is a static code; if the master controller randomly generates the first feature code according to a preset rule, the first feature code is issued to the slave device 102 in a broadcast or unicast mode through wireless communication or power line carrier communication; the first characteristic code is dynamic code;
alternatively, the slave device 102 is further configured to: if the main controller 103 records the first feature code, the first feature code is recorded in a memory which has no data loss when power is off before leaving the factory, and the first feature code is a static code.
Optionally, if the first feature code is recorded, when the master controller 103 issues the first feature code to the slave device 102 through wireless communication or power line carrier communication, the master controller is specifically configured to:
if the first feature code is recorded, the first feature code is issued to the slave device 102 in a broadcast manner through wireless communication or power line carrier communication in a system installation and debugging stage;
or, if the first feature code is recorded, in a system installation and debugging phase, the first feature code is issued to the slave device 102 in a unicast manner through wireless communication or power line carrier communication according to a second feature code of the slave device pre-stored inside.
Optionally, the main controller 103 is further configured to:
after judging whether the first feature code is generated or recorded, if the main controller 103 does not generate or record the first feature code, the main controller 103 sends a second instruction to the slave device 102 in a broadcast form through wireless communication or power line carrier communication;
the slave device 102 parses the second instruction;
the slave device 102 determines whether the parsing result includes a wildcard code; the wildcard code is a code pre-stored in the slave device 102;
if the parsing result includes the wildcard code, the slave device 102 executes a second instruction to implement operation control on the corresponding power device.
The master controller instructions in different distributed power systems are distinguished by adopting the wildcard codes, so that the problem of communication crosstalk between different distributed power systems in the prior art can be avoided, the master controller and each slave device in the same distributed power system can be sourced from different manufacturers, the universality of the device is improved, more selection spaces are provided when a certain slave device breaks down and needs to be replaced, the device is not limited to products of the same manufacturer, the system repair time can be effectively shortened, and the working efficiency is improved; the main controller can also issue a first characteristic code to the newly replaced slave equipment in time according to the specific application environment of the main controller, so that the whole system can be controlled by applying the first instruction with the first characteristic code again, and communication mutual interference which possibly occurs when adjacent systems meet the same condition and adopt wildcard codes at the same time is avoided.
The following describes an application process of the method for suppressing communication crosstalk of a distributed power supply system according to an embodiment of the present invention, by taking a photovoltaic power generation system as an example.
Referring to fig. 3, fig. 3 is a structural diagram of a distributed power supply system according to an embodiment of the present invention. In the system shown in fig. 3, the power supply apparatus 101 is a photovoltaic module, the slave apparatus 102 is a shutdown device provided in correspondence with the power supply apparatus 101, and the master controller 103 is a controller provided in correspondence with the shutdown device, and in addition, the system further includes an inverter 104 necessary for the photovoltaic power generation system, and a grid 105 connected to an output side of the photovoltaic power generation system. For ease of description, fig. 3 primarily shows a more complete photovoltaic power generation system, with only the main controller, i.e., the main controller 106, shown for other photovoltaic power generation systems.
As is known, for any photovoltaic power generation system, a shutdown device is installed on each photovoltaic module, and is used to perform actions of disconnecting the photovoltaic module from the photovoltaic array and stopping power generation after receiving a shutdown command. The output of the shutdown device is connected in series-parallel to the dc input of a photovoltaic inverter, i.e., inverter 104 in fig. 3, which converts dc power to ac power for transmission to the grid 105.
When the two photovoltaic power generation systems are installed at a short distance, the photovoltaic module of each photovoltaic power generation system is provided with a turn-off device, and the turn-off devices can execute safe turn-off of the photovoltaic modules after receiving turn-off instructions, so that the output voltage or power of the photovoltaic modules is reduced to a safe level. Referring to fig. 3, when a fire hazard occurs in the first photovoltaic power generation system where the master controller 106 is located, the master controller 106 of the first photovoltaic power generation system issues a module shutdown instruction through wireless communication, and since the two photovoltaic power generation systems are arranged at a short distance and the shutdown instruction is received by all shutdown devices in the two photovoltaic power generation systems, the shutdown instruction is also executed by another shutdown device, i.e., the slave device 102, in the second photovoltaic power generation system where no fire hazard occurs, so that power generation is stopped.
By adopting the method for inhibiting the communication crosstalk of the distributed power system provided by the embodiment of the invention, the situations can be effectively avoided.
The second photovoltaic power generation system is provided with a main controller, the main controller is provided with a unique number M1804260011, in the system installation and debugging stage, the main controller is communicated with all the turn-off devices through wireless communication and sends the number to the turn-off devices of all the photovoltaic modules in the second photovoltaic power generation system in a broadcasting mode, and after receiving the number M1804260011 of the main controller, all the turn-off devices are prestored in respective memories.
When the main controller with the number of M1804260011 sends a shutdown instruction, the shutdown instruction has a field of M1804260011, and after each shutdown device receives the shutdown instruction, the shutdown instruction is analyzed, whether the received shutdown instruction contains the field of M1804260011 is determined according to the analysis result, if the received shutdown instruction contains the field, the shutdown operation is executed, and if the received shutdown instruction does not contain the field, the instruction is ignored.
Correspondingly, if the main controller numbered M1804260012 in the first photovoltaic power generation system, that is, the main controller 106 in fig. 3, sends the start instruction in the normal operation process of the second photovoltaic power generation system, because the two photovoltaic power generation systems are closer in distance, the instruction sent by the main controller 106 in the broadcast manner can also be received by each shutdown device in the second photovoltaic power generation system, as described above, each shutdown device in the second photovoltaic power generation system analyzes after receiving the start instruction sent by the main controller 106, and finds that the start instruction does not include the M1806004211 field, it may be determined that the start instruction is from a different photovoltaic power generation system, and the start instruction is not executed. Thus, the influence of the communication crosstalk of other systems on the system is prevented.
The rest of the principle is the same as the above embodiments, and is not described in detail here.
The embodiments of the invention are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (13)
1. A method for suppressing crosstalk in communication in a distributed power system, the distributed power system comprising: a master controller, a plurality of power supply devices, and at least one slave device; the method for suppressing the communication crosstalk of the distributed power system comprises the following steps:
the master controller sends a first instruction to each slave device in a signal transmission range in a broadcast or unicast mode through wireless communication or power line carrier communication;
the slave device analyzes the first instruction;
the slave equipment judges whether the analysis result comprises a first feature code or not; the first characteristic code is a code pre-stored in the slave device, so that the slave device can judge whether the received first instruction is originated from the master controller belonging to the same distributed power supply system according to the stored first characteristic code; if the first characteristic code is a code issued to each slave device by the master controller, the first characteristic code is a static code or a dynamic code; if the first characteristic code is a code recorded by the slave device in a memory without losing data when the slave device loses power before leaving a factory, the first characteristic code is a static code;
and if the analysis result comprises the first characteristic code, the slave equipment executes the first instruction so as to realize the operation control of the corresponding power supply equipment.
2. The method for suppressing crosstalk in communication of a distributed power supply system according to claim 1, wherein after the slave device determines whether the analysis result includes the first signature code, the method further includes:
and if the analysis result does not comprise the first feature code, the slave equipment ignores the first instruction.
3. The method for suppressing crosstalk in communication of a distributed power supply system according to claim 1, wherein the first instruction is: the limitation of the output voltage, the output current, or the output power is released, and the system is started or stopped.
4. The method for suppressing crosstalk in communication in a distributed power supply system according to any one of claims 1 to 3, wherein before the master controller transmits the first command in a broadcast or unicast manner to each of the slave devices in a signal transmission range by wireless communication or power line carrier communication, the method further comprises:
the main controller judges whether the first characteristic code is generated or recorded;
if the master controller records the first feature code, the master controller issues the first feature code to each slave device in a signal transmission range in a broadcast or unicast mode through wireless communication or power line carrier communication, or the slave devices record the first feature code in a memory of the slave devices without losing data after power failure before leaving a factory, wherein the first feature code is static code;
if the master controller randomly generates the first feature code according to a preset rule, the master controller issues the first feature code to each slave device in a signal transmission range in a broadcast or unicast mode through wireless communication or power line carrier communication, wherein the first feature code is dynamic code.
5. The method for suppressing crosstalk in communication of a distributed power supply system according to claim 4, wherein if the master controller records the first signature code, the master controller issues the first signature code to each of the slave devices in a signal transmission range in a broadcast or unicast manner through wireless communication or power line carrier communication, including:
if the main controller records the first feature code, in a system installation and debugging stage, the main controller issues the first feature code to each slave device in a signal transmission range in a broadcast mode through wireless communication or power line carrier communication;
or, if the master controller records the first feature code, in a system installation and debugging stage, the master controller issues the first feature code to each slave device in a signal transmission range in a unicast manner through wireless communication or power line carrier communication according to a second feature code of the slave device prestored inside.
6. The method for suppressing crosstalk in communication of a distributed power supply system according to claim 4, wherein after the main controller determines whether the first signature code is generated or recorded, the method further comprises:
if the first characteristic code is not generated or recorded by the master controller, the master controller sends a second instruction to each slave device in a signal transmission range in a broadcast mode through wireless communication or power line carrier communication;
the slave device analyzes the second instruction;
the slave equipment judges whether the analysis result comprises a wildcard code or not; the wildcard code is a code pre-stored in the slave device;
and if the analysis result comprises the wildcard code, the slave equipment executes the second instruction to realize the operation control of the corresponding power supply equipment.
7. A distributed power system, comprising: a master controller, a plurality of power supply devices, and at least one slave device; wherein:
the master controller is used for sending a first instruction to each slave device in a signal transmission range in a broadcast or unicast mode through wireless communication or power line carrier communication;
the slave equipment is used for analyzing the first instruction and judging whether an analysis result comprises a first feature code or not; the first characteristic code is a code pre-stored in the slave device, so that the slave device can judge whether the received first instruction is originated from the master controller belonging to the same distributed power supply system according to the stored first characteristic code; if the analysis result comprises the first feature code, executing the first instruction to realize operation control on corresponding power supply equipment; if the first characteristic code is a code issued to each slave device by the master controller, the first characteristic code is a static code or a dynamic code; and if the first characteristic code is a code recorded by the slave device in a memory without losing data after power failure before leaving the factory, the first characteristic code is a static code.
8. The distributed power system of claim 7, wherein the slave device is further configured to: after judging whether the analysis result includes the first feature code, if the analysis result does not include the first feature code, ignoring the first instruction.
9. The distributed power system of claim 7, wherein the first instruction is to: the limitation of the output voltage, the output current, or the output power is released, and the system is started or stopped.
10. The distributed power system of claim 7, wherein the power device is a photovoltaic module or a battery.
11. The distributed power system of any of claims 7-10, wherein said master controller is further configured to:
judging whether the first characteristic code is generated or recorded before transmitting a first instruction in a broadcast or unicast mode to each slave device within a signal transmission range through wireless communication or power line carrier communication; if the first feature code is recorded, the first feature code is issued to each slave device in a signal transmission range in a broadcast or unicast mode through wireless communication or power line carrier communication, and the first feature code is static code; if the master controller randomly generates the first feature code according to a preset rule, the first feature code is issued to each slave device in a signal transmission range in a broadcast or unicast mode through wireless communication or power line carrier communication, and the first feature code is dynamic code;
or, the slave device is further configured to:
if the first characteristic code is recorded in the main controller, the first characteristic code is recorded in a memory with no data loss after power failure before leaving a factory, and the first characteristic code is static code.
12. The distributed power supply system according to claim 11, wherein the master controller is configured to, if the first signature code is recorded, when the first signature code is issued to each of the slave devices in a signal transmission range through wireless communication or power line carrier communication, specifically:
if the first characteristic code is recorded, in a system installation and debugging stage, the first characteristic code is issued to each slave device in a signal transmission range in a broadcast mode through wireless communication or power line carrier communication;
or, if the first feature code is recorded, in a system installation and debugging stage, according to a second feature code of the slave device prestored inside, the first feature code is issued to each slave device in a signal transmission range in a unicast manner through wireless communication or power line carrier communication.
13. The distributed power system of claim 11, wherein the master controller is further configured to:
after judging whether the first feature code is generated or recorded, if the first feature code is not generated or recorded by the main controller, the main controller sends a second instruction to each slave device in a signal transmission range through wireless communication or power line carrier communication;
the slave device analyzes the second instruction;
the slave equipment judges whether the analysis result comprises a wildcard code or not; the wildcard code is a code pre-stored in the slave device;
and if the analysis result comprises the wildcard code, the slave equipment executes the second instruction to realize the operation control of the corresponding power supply equipment.
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