CN210724683U - Compound communication system of photovoltaic optimizer based on Lora and PLC - Google Patents

Compound communication system of photovoltaic optimizer based on Lora and PLC Download PDF

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Publication number
CN210724683U
CN210724683U CN201922235118.3U CN201922235118U CN210724683U CN 210724683 U CN210724683 U CN 210724683U CN 201922235118 U CN201922235118 U CN 201922235118U CN 210724683 U CN210724683 U CN 210724683U
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photovoltaic
module
lora
optimizer
communication
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高培鑫
李红勇
肖海斌
彭文博
余记远
李帆
刘大为
高虎
李元
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Huaneng Clean Energy Research Institute
Huaneng Group Technology Innovation Center Co Ltd
Huaneng Lancang River Hydropower Co Ltd
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Huaneng Clean Energy Research Institute
Huaneng Group Technology Innovation Center Co Ltd
Huaneng Lancang River Hydropower Co Ltd
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02DCLIMATE CHANGE MITIGATION TECHNOLOGIES IN INFORMATION AND COMMUNICATION TECHNOLOGIES [ICT], I.E. INFORMATION AND COMMUNICATION TECHNOLOGIES AIMING AT THE REDUCTION OF THEIR OWN ENERGY USE
    • Y02D30/00Reducing energy consumption in communication networks
    • Y02D30/70Reducing energy consumption in communication networks in wireless communication networks
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

The utility model discloses a photovoltaic optimizer composite communication system based on Lora and PLC belongs to photovoltaic power generation technical field. The detection unit of the power optimizer can collect the electric parameter data of the photovoltaic module in real time, the communication between the upper computer and the photovoltaic optimizer is carried out through the Lora communication module, and the communication between the photovoltaic optimizer and the photovoltaic optimizer is carried out through the PLC communication module. Through Lora communication module and PLC communication module, the host computer can master the actual behavior of every photovoltaic module in the photovoltaic system in real time to confirm photovoltaic module's positional information through photovoltaic optimizer's unique identification ID, and then issue control command according to the actual behavior, adjust photovoltaic optimizer's mode, guarantee photovoltaic module's normal work. The utility model discloses a compound communication system combines both, need not additionally to build communication network, and the cost is effectively reduced has improved the reliability and the stability of communication.

Description

Compound communication system of photovoltaic optimizer based on Lora and PLC
Technical Field
The utility model belongs to the technical field of the communication of photovoltaic optimizer, concretely relates to compound communication system of photovoltaic optimizer based on Lora and PLC.
Background
The photovoltaic optimizer can realize Maximum Power Point Tracking (MPPT) on each photovoltaic module, ensures that each photovoltaic module in a photovoltaic system can output electric energy to the maximum extent, has the functions of energy transmission, energy optimization, data acquisition and communication, and is suitable for being used in regions with serious mountain regions and roofs.
The current photovoltaic optimizer is single in communication mode, and generally adopts a wired communication method RS485 communication, bus communication, power line carrier PLC communication or a wireless communication method Lora technology. RS485 communication and bus communication methods are simple, but a communication network needs to be laid to increase construction cost, a power line carrier PLC (programmable logic controller) communication dispenses with a communication line, communication can be realized through an electric wire, but in a direct current system line, the ground capacitance is large, the filtering effect is large, the attenuation of a carrier signal along with the distance is fast, and the power generation efficiency is influenced by improving the transmitting power. The wireless communication Lora technology is small in size, strong in performance, strong in environmental adaptability and suitable for outdoor work, but cannot solve the problem of positioning of photovoltaic optimizers in a system, cannot determine which two adjacent photovoltaic optimizers are connected, is high in delay through wireless communication, and cannot meet the problem of communication of adjacent optimizers and issue instruction information to all photovoltaic optimizers in the system quickly.
Disclosure of Invention
In order to solve the existing problem, the utility model aims to provide a photovoltaic optimizer composite communication system based on Lora and PLC can fix a position every photovoltaic optimizer in the position of system, need not additionally to build communication network, and is with low costs, and the real-time of communication is good, and reliability and stability are high.
The utility model discloses a following technical scheme realizes:
the utility model discloses a photovoltaic optimizer composite communication system based on Lora and PLC, which comprises a photovoltaic optimizer connected with each photovoltaic component in a photovoltaic system, wherein the input end of the photovoltaic optimizer is connected with the corresponding photovoltaic component, and the output end of the photovoltaic optimizer is connected with other photovoltaic optimizers in series;
the photovoltaic optimizer comprises a processing unit and a power conversion unit, the power conversion unit is respectively connected with the processing unit and the photovoltaic module, and the input end and the output end of the power conversion unit are both connected with a detection unit; the processing unit is also connected with a Lora communication module and a PLC communication module;
the photovoltaic optimizer is connected with an upper computer through a Lora communication module and connected with PLC communication modules of other photovoltaic optimizers through PLC communication modules, and each photovoltaic optimizer is provided with a unique identification ID.
Preferably, the power conversion unit includes a boost synchronous rectification circuit.
Preferably, the detection unit comprises two shunt monitors for detecting the current at the input and output of the power conversion unit and two voltage dividers for detecting the voltage at the input and output of the power conversion unit.
Preferably, the upper computer comprises a Lora data acquisition module, a data processing module and a storage module; the Lora data acquisition module is interconnected with the communication of Lora communication module, and the Lora data acquisition module is connected with the data processing module, and the data processing module is connected and is connected with the storage module.
Preferably, the antennas of the Lora communication module and the PLC communication module are fixed on the outer wall of the photovoltaic optimizer casing without contact.
Further preferably, the photovoltaic optimizer housing is a non-metallic housing.
Compared with the prior art, the utility model discloses following profitable technological effect has:
the utility model discloses a compound communication system of photovoltaic optimizer based on Lora and PLC, photovoltaic module's electric parameter data can be gathered in real time to the detecting element of power optimizer to carry out the communication of host computer and photovoltaic optimizer through Lora communication module, carry out the communication between photovoltaic optimizer and the photovoltaic optimizer through PLC communication module. Through Lora communication module and PLC communication module, the host computer can master the actual behavior of every photovoltaic module in the photovoltaic system in real time to confirm photovoltaic module's positional information through photovoltaic optimizer's unique identification ID, and then issue control command according to the actual behavior, adjust photovoltaic optimizer's mode, guarantee photovoltaic module's normal work. The Lora communication module has the advantages of small size, strong environment adaptation capability, long propagation distance, more lower clients accepted by a single upper computer and capability of ensuring the reliability of information. The PLC communication module has the advantages that the timeliness of data and instruction information transmitted by the PLC communication module and adjacent photovoltaic optimizer strings is good, and the instructions of the upper computer can be rapidly issued to each photovoltaic optimizer, so that the real-time performance of the system is improved. The utility model discloses a compound communication system combines both, need not additionally to build communication network, and the cost is effectively reduced has improved the reliability and the stability of communication.
Furthermore, the antennas of the Lora communication module and the PLC communication module are not in contact with each other and are fixed on the inner wall of the shell of the photovoltaic optimizer, and mutual electromagnetic interference between the antennas is prevented.
Furthermore, the photovoltaic optimizer shell is a non-metal shell, so that the influence of electromagnetic interference on the communication effect is further reduced.
Drawings
Fig. 1 is a schematic structural diagram of the composite communication system of the photovoltaic optimizer based on Lora and PLC of the present invention;
fig. 2 is a functional structure diagram of the photovoltaic optimizer of the present invention;
fig. 3 is the utility model discloses a power line carrier PLC communication module's communication working principle diagram.
Detailed Description
The invention will be described in further detail with reference to the following drawings and specific examples, which are intended to illustrate and not to limit the invention:
as shown in fig. 2, the composite communication system of photovoltaic optimizer based on Lora and PLC of the present invention includes a photovoltaic optimizer connected to each photovoltaic module in the photovoltaic system, wherein the input end of the photovoltaic optimizer is connected to the corresponding photovoltaic module, and the output end of the photovoltaic optimizer is connected to other photovoltaic optimizers in series;
the photovoltaic optimizer comprises a processing unit and a power conversion unit, the power conversion unit is respectively connected with the processing unit and the photovoltaic module, and the power conversion unit comprises a boosting synchronous rectification circuit and is used for carrying out power conversion on the output of the photovoltaic module; the input end and the output end of the power conversion unit are both connected with a detection unit, and the detection unit comprises two shunt monitors for detecting the current of the input end and the current of the output end of the power conversion unit and two voltage dividers for detecting the voltage of the input end and the voltage of the output end of the power conversion unit; the processing unit is also connected with a Lora communication module and a PLC communication module;
the photovoltaic optimizer is connected with an upper computer through a Lora communication module, and the upper computer comprises a Lora data acquisition module, a data processing module and a storage module; the Lora data acquisition module is interconnected with the communication of Lora communication module, and the Lora data acquisition module is connected with the data processing module, and the data processing module is connected and is connected with the storage module. The photovoltaic optimizer is connected with PLC communication modules of other photovoltaic optimizers through a PLC communication module, and each photovoltaic optimizer is provided with a unique identification ID.
The antennas of the Lora communication module and the PLC communication module are not fixed on the outer wall of the photovoltaic optimizer shell in a contact mode, and the photovoltaic optimizer shell is a non-metal shell.
The processing unit may adopt MCU, and may adopt STM32F334C8T 6.
The Lora communication module may employ the RFM 98.
The PLC communication module may employ the MC 13250023.
The utility model discloses a compound communication system of photovoltaic optimizer based on Lora and PLC at the during operation:
when an upper computer needs to collect data of a certain string of photovoltaic optimizer string, confirming the position information of the photovoltaic optimizer string according to the unique identification ID of the photovoltaic optimizer, giving an instruction to Lora communication modules of all photovoltaic optimizers in the photovoltaic optimizer string by the upper computer, collecting electric parameter data (including input and output voltages and currents, PWM duty ratio and other data) of the input end and the output end of a power conversion unit by a detection unit, and sending the electric parameter data to PLC communication modules of adjacent photovoltaic optimizers through PLC communication modules; the processing unit of each photovoltaic optimizer in the photovoltaic optimizer string sorts the electrical parameter data of the photovoltaic optimizer and the electrical parameter data of adjacent photovoltaic optimizers according to the importance requirements of an upper computer on different electrical parameters, and then the electrical parameter data are sequentially uploaded to the upper computer through the Lora communication module; the upper computer analyzes and processes all the electric parameter data uploaded by the photovoltaic optimizer string, compares the electric parameter data of each photovoltaic optimizer with the electric parameter data of the photovoltaic optimizer received by the adjacent photovoltaic optimizer at the same time, and if the comparison is consistent, the data is considered to be reliable and recorded; if the comparison is inconsistent, the data is considered unreliable and not recorded;
when the upper computer sends an instruction, the upper computer sends the instruction to the Lora communication module of a certain photovoltaic optimizer, after the photovoltaic optimizer receives the instruction, the instruction is sent to the Lora communication module of the adjacent photovoltaic optimizer through the PLC communication module, the adjacent PLC communication modules communicate with each other through a handshaking method until all the photovoltaic optimizers receive the instruction sent by the upper computer, and the operation mode of all the photovoltaic optimizers is changed according to the instruction sent by the upper computer.
The method is high in automation degree, when the photovoltaic system works normally, the upper computer can master the working condition of each photovoltaic module in real time, and the working mode of the photovoltaic optimizer is adjusted according to actual conditions, so that the normal work of the photovoltaic modules is guaranteed. The communication mode of combining the Lora communication module and the PLC communication module fully exerts the advantages of the Lora communication module and the PLC communication module; the upper computer receives the local electrical parameter data uploaded by a single photovoltaic optimizer and the electrical parameter data of the photovoltaic optimizer uploaded by adjacent photovoltaic optimizers at the same time, records the data after comparison, avoids data failure caused by temporary faults of individual equipment or other reasons, improves the reliability and stability of communication, and provides powerful support for intelligent operation and maintenance of photovoltaic. The data with high importance can be ensured to have high priority, and the reliability of communication is further improved. And adjacent PLC communication modules communicate by adopting a handshaking method, so that the condition that data packets are lost due to gradual attenuation of the communication signal intensity of long-group serial power carrier is avoided.
The following is a specific embodiment for further explanation of the photovoltaic optimizer composite communication system based on Lora and PLC and its working method:
referring to fig. 1, a photovoltaic system includes s photovoltaic optimizers and an upper computer. The outputs of the m photovoltaic optimizers are connected in series to form a photovoltaic optimizer string, and the n photovoltaic optimizers are connected in series and parallel to form s photovoltaic optimizers in total. And the ith photovoltaic optimizer is connected in series with the (i-1) th photovoltaic optimizer and the (i + 1) th photovoltaic optimizer which are adjacent in the jth string of photovoltaic optimizers.
As shown in fig. 3, the power line carrier PLC module is divided into two parts, i.e., a transmitting part and a receiving part, the processing unit transmits information through a serial port, the logic processing unit combines signals with a fundamental frequency signal generated by the carrier generator, and the signal is amplified and transmitted to an adjacent photovoltaic optimizer through a carrier transformer to generate a high-frequency signal on a power line. The receiving part amplifies, detects and shapes the high-frequency signal transmitted by the power line proximity optimizer, extracts information and transmits the information to the serial port of the processing unit. The wave trap filters out high-frequency signals, and the power line carrier PLC module of the ith photovoltaic optimizer can only receive the (i-1) th photovoltaic optimizer and the (i + 1) th photovoltaic optimizer which are adjacent to the two photovoltaic optimizers and are connected in series at the positive and negative poles of the output end of the power line carrier PLC module.
The initialization steps of the composite communication system are as follows:
initializing step 1, the ith photovoltaic optimizer transmits the ID thereof to a power line carrier PLC module of an adjacent (i-1) th photovoltaic optimizer and a power line carrier PLC module of an (i + 1) th photovoltaic optimizer through the power line carrier PLC module of the ith photovoltaic optimizer;
initializing step 2, the ith photovoltaic optimizer receives ID numbers of the adjacent ith-1 photovoltaic optimizer and ith +1 photovoltaic optimizer through a power line carrier PLC module;
initializing step 3, the ith photovoltaic optimizer sends a network access request to the upper computer through a wireless communication Lora module, the upper computer agrees to access the network, registers and establishes a connection, and the ith photovoltaic optimizer receives data of the upper computer;
initializing step 4, the upper computer starts to acquire data required by all the networked photovoltaic optimizers, and the ith photovoltaic optimizer uploads the ID numbers of the ith photovoltaic optimizer and the i-1 and the (i + 1) th photovoltaic optimizers to the upper computer;
and 5, initializing, namely, starting pairing on the received ID of the photovoltaic optimizer by a data processing module of the upper computer. The data of the ith photovoltaic optimizer comprises IDs of the (i-1) th photovoltaic optimizer at the front end and the (i + 1) th photovoltaic optimizer at the rear end, the front end is paired with the front end, the front end is paired with the rear end to form n chains, and each chain has m IDs so as to determine the position of the photovoltaic optimizer in the array;
and 6, initializing, namely issuing the position information of the ith photovoltaic optimizer in the jth string of photovoltaic optimizers to the ith photovoltaic optimizer for storage by the upper computer.
The normal working steps of the composite communication mode are as follows:
step 1, when the upper computer needs to collect data of a j-th string of photovoltaic optimizer strings, the upper computer sends beacons to all the photovoltaic optimizers of the j-th string of photovoltaic optimizer strings to request to accelerate communication and collect data, and a processing unit of an ith photovoltaic optimizer of the j-th string starts to obtain the data of the photovoltaic optimizer from a power conversion unit;
in a normal working step 2, after the ith photovoltaic optimizer receives the beacon, the processing unit transmits the data collected from the power unit to the power line carrier PLC module of the adjacent ith-1 photovoltaic optimizer and the power line carrier PLC module of the (i + 1) th photovoltaic optimizer through the power line carrier PLC module of the processing unit;
step 3, in a normal working step, a processing unit of the ith photovoltaic optimizer receives data of the (i-1) th photovoltaic optimizer and the (i + 1) th photovoltaic optimizer which are adjacent through a power line carrier PLC module; the processing unit uploads the data of the three photovoltaic optimizers including the data of the local computer to an upper computer through a wireless communication Lora module;
step 4, in a normal working step, a data processing module of the upper computer analyzes and processes data of all photovoltaic optimizers of a j string of photovoltaic assembly strings, compares data collected by an ith photovoltaic optimizer with data of the ith photovoltaic optimizer, which is obtained by the communication between the ith photovoltaic optimizer and the i-1 th photovoltaic optimizer and the i +1 th photovoltaic optimizer from the power carrier PLC module, compares the data under the condition of determined time consistency, if the data are compared consistently, the data are considered to be reliable and recorded, and if the data are not compared consistently, the data are considered to be unreliable and not recorded;
and 5, normally working, when the upper computer sends an instruction, the Lora information acquisition module of the upper computer sends instruction information to the ith photovoltaic optimizer in the jth string, the photovoltaic optimizer which sends the instruction information to the (i-1) th photovoltaic optimizer and the (i + 1) th photovoltaic optimizer through the power line carrier PLC module, the (i-1) th photovoltaic optimizer transmits the instruction information to the (i-2) th photovoltaic optimizer, the (i + 1) th photovoltaic optimizer transmits the instruction information to the (i + 2) th photovoltaic optimizer, and so on, the instruction information can be transmitted to all the photovoltaic optimizers in the photovoltaic optimizer string, and all the optimizers change the running mode according to the instruction information.
It should be noted that the above description is only one of the embodiments of the present invention, and all equivalent changes made by the system described in the present invention are included in the protection scope of the present invention. The technical field of the present invention can be replaced by other embodiments described in a similar manner, without departing from the structure of the present invention or exceeding the scope defined by the claims, which belong to the protection scope of the present invention.

Claims (6)

1. A composite communication system of photovoltaic optimizers based on Lora and PLC is characterized by comprising a photovoltaic optimizer connected with each photovoltaic module in the photovoltaic system, wherein the input end of the photovoltaic optimizer is connected with the corresponding photovoltaic module, and the output end of the photovoltaic optimizer is connected with other photovoltaic optimizers in series;
the photovoltaic optimizer comprises a processing unit and a power conversion unit, the power conversion unit is respectively connected with the processing unit and the photovoltaic module, and the input end and the output end of the power conversion unit are both connected with a detection unit; the processing unit is also connected with a Lora communication module and a PLC communication module;
the photovoltaic optimizer is connected with an upper computer through a Lora communication module and connected with PLC communication modules of other photovoltaic optimizers through PLC communication modules, and each photovoltaic optimizer is provided with a unique identification ID.
2. The Lora-and-PLC-based photovoltaic optimizer composite communication system of claim 1, wherein the power conversion unit comprises a boost synchronous rectification circuit.
3. The Lora and PLC based photovoltaic optimizer composite communication system of claim 1, wherein the detection unit comprises two shunt monitors for detecting the current at the input and output of the power conversion unit and two voltage dividers for detecting the voltage at the input and output of the power conversion unit.
4. The Lora and PLC-based photovoltaic optimizer composite communication system according to claim 1, wherein the upper computer comprises a Lora data acquisition module, a data processing module and a storage module; the Lora data acquisition module is interconnected with the communication of Lora communication module, and the Lora data acquisition module is connected with the data processing module, and the data processing module is connected and is connected with the storage module.
5. The Lora and PLC-based photovoltaic optimizer composite communication system according to claim 1, wherein antennas of the Lora communication module and the PLC communication module are fixed on an outer wall of the photovoltaic optimizer housing without contact.
6. The Lora and PLC based photovoltaic optimizer composite communication system of claim 5, wherein the photovoltaic optimizer housing is a non-metal housing.
CN201922235118.3U 2019-12-13 2019-12-13 Compound communication system of photovoltaic optimizer based on Lora and PLC Active CN210724683U (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112186897A (en) * 2020-09-21 2021-01-05 合肥阳光新能源科技有限公司 Monitoring system, positioning method and device of photovoltaic module and storage medium

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN112186897A (en) * 2020-09-21 2021-01-05 合肥阳光新能源科技有限公司 Monitoring system, positioning method and device of photovoltaic module and storage medium
CN112186897B (en) * 2020-09-21 2022-09-13 阳光新能源开发股份有限公司 Monitoring system, positioning method and device of photovoltaic module and storage medium

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