A photovoltaic protocol converter based on power line carrier communication technology

Abstract

This invention discloses a photovoltaic protocol converter based on power line carrier communication technology, comprising: a power line carrier chip, a power supply filter circuit, a carrier coupling circuit, a zero-crossing circuit, a power amplifier circuit, a main control chip circuit, a 485 circuit, a clock circuit, a level conversion circuit, a wireless communication circuit, an ESAM circuit, and a FLASH circuit. The 485 circuit is connected to an external inverter to acquire inverter information and perform information exchange. After acquiring the information, the main control unit circuit transmits the information as a single-phase dual-mode module through the carrier module interface. This photovoltaic protocol converter can collect, process, and monitor the power generation and consumption information of photovoltaic users in real time, improving the information monitoring of photovoltaic power generation and making the power consumption process safer and more reliable for users, thus solving the problem of information collection being impossible in traditional photovoltaic power supply systems.

Description

Technical Field

[0001] This invention relates to the field of photovoltaic power communication technology, and more specifically to a photovoltaic protocol converter based on power line carrier communication technology. Background Technology

[0002] Photovoltaic power generation systems are a new type of power generation system that utilizes the photovoltaic effect of solar cell semiconductor materials to directly convert solar radiation energy into electrical energy. With the development of science and technology, photovoltaic power has become ubiquitous in daily life, playing a vital role in street lighting, photovoltaic energy storage, and residential solar power systems. Complex photovoltaic systems can be integrated into the power grid. The application of photovoltaic power not only significantly reduces environmental pollution but also lowers household electricity costs, playing a crucial role in environmental improvement.

[0003] Power line carrier communication (PLC) is a type of power system communication that uses power transmission lines as the carrier signal transmission medium. Because power transmission lines have a very robust supporting structure and are equipped with three or more conductors (typically three good conductors and one or two overhead ground wires), they can transmit power frequency current while simultaneously transmitting carrier signals, making it both economical and highly reliable. This integrated approach has become a preferred communication method for most power sectors. Combining PLC with photovoltaic power generation systems can reduce costs, improve communication convenience and reliability, and enable its widespread application in photovoltaic power systems.

[0004] In the field of photovoltaic power systems, researching practical scenarios for high-efficiency, low-cost, and large-scale applications is currently the forefront and an important development direction for photovoltaic power generation. However, in practical applications, it has been found that solar energy is greatly affected by weather changes, resulting in a constantly unstable power system during 24 / 7 photovoltaic power generation and consumption. This instability severely restricts the use of photovoltaic energy. Photovoltaic protocol converters can solve this instability problem, but currently available photovoltaic protocol converters on the market have relatively limited functions. Most simply connect to inverters to read and transmit inverter information, without addressing power quality allocation and monitoring, and their monitoring capabilities are weak, leading to slow upgrade speeds. Summary of the Invention

[0005] To address this, the present invention proposes a photovoltaic protocol converter based on power line carrier communication technology, which can collect, process, and monitor the power generation and consumption information of photovoltaic users in real time, improve the information monitoring of photovoltaic power generation, make the power consumption of users safer and more reliable, and solve the aforementioned problems existing in the photovoltaic protocol converters currently used in power supply systems.

[0006] A photovoltaic protocol converter based on power line carrier communication technology includes: a power line carrier chip, a power supply filter circuit, a carrier coupling circuit, a zero-crossing circuit, a power amplifier circuit, a main control chip circuit, a 485 circuit, a clock circuit, and a level conversion circuit. The power line carrier chip modulates and demodulates the carrier signal through the carrier coupling circuit, transmits data via the power line, and connects to at least one grid concentrator. The power supply filter circuit filters the input power supply to provide the operating voltage for the photovoltaic protocol converter. The carrier coupling circuit transmits the input information received by the power line carrier to the power line carrier chip via carrier coupling, and transmits the output information of the power line carrier sent by the power line carrier chip via carrier coupling and the power line to a secondary information processing device. The zero-crossing circuit determines when the power line crosses zero and then transmits the information. The power amplifier circuit is used to... After the signal output from the chip is amplified, it is loaded onto the power line and transmitted to the information processing device via the carrier coupling circuit. The main control chip circuit processes the information transmitted from the 485 circuit and then transmits the processed information to the external connection device via the 485 circuit. It also transmits information to the power line carrier chip via the level conversion circuit, and then the carrier coupling circuit transmits the output information to the information processing device. The 485 circuit transmits information from the external inverter to the main control chip circuit and transmits control commands from the main control chip circuit back to the external inverter for interaction. The clock circuit stores the device time and transmits the information to the information processing device via the main control chip circuit. The level conversion circuit performs level conversion on the serial port signal between the main control chip circuit and the power line carrier chip, serving as a level conversion and protection circuit.

[0007] Furthermore, the power line carrier chip transmits the output information to the power grid concentrator through the carrier coupling circuit.

[0008] Furthermore, it also includes: a wireless communication circuit connected to the main control chip circuit, used for remotely upgrading the main control chip circuit.

[0009] Furthermore, it also includes an ESAM circuit, connected to the main control chip circuit, used to encrypt the meter number of the photovoltaic protocol converter.

[0010] Furthermore, it also includes: a FLASH circuit connected to the power line carrier chip.

[0011] The beneficial effects of the technical solution of this invention are reflected in the following: The photovoltaic protocol converter of this invention uses power line carrier communication technology, which has the advantages of not requiring wiring, high reliability, and long communication distance. It is suitable for transmission communication between building groups and can be used on a large scale in photovoltaic power generation scenarios. Moreover, for large-scale power generation scenarios of multi-node photovoltaic power systems, the power line carrier communication technology of the photovoltaic protocol converter has greater advantages than wireless communication. At the same time, the photovoltaic protocol converter is also compatible with inverter models from most manufacturers, and can achieve the advantages of simple operation, high efficiency, and high reliability, showing great potential in photovoltaic power generation systems. Attached Figure Description

[0012] Figure 1 This is a structural block diagram of a photovoltaic protocol converter based on power line carrier communication technology according to an embodiment of the present invention.

[0013] Figure 2 This is a circuit diagram of the power line carrier chip in the photovoltaic protocol converter of this invention.

[0014] Figure 3 This is a circuit diagram of the power filter circuit in the photovoltaic protocol converter according to an embodiment of the present invention.

[0015] Figure 4 This is a circuit diagram of the carrier coupling circuit in the photovoltaic protocol converter of this invention.

[0016] Figure 5 This is a circuit diagram of the zero-crossing circuit in the photovoltaic protocol converter of this invention.

[0017] Figure 6 This is a circuit diagram of the power amplifier circuit in the photovoltaic protocol converter of this invention.

[0018] Figure 7 This is a circuit diagram of the main control chip circuit in the photovoltaic protocol converter of this invention.

[0019] Figure 8 This is a circuit diagram of the 485 circuit in the photovoltaic protocol converter of this invention.

[0020] Figure 9 This is a circuit diagram of the RTC clock circuit in the photovoltaic protocol converter of this invention.

[0021] Figure 10 This is a circuit diagram of the level conversion circuit in the photovoltaic protocol converter of this invention.

[0022] Figure 11 This is a circuit diagram of the wireless communication circuit in the photovoltaic protocol converter according to an embodiment of the present invention.

[0023] Figure 12 This is a circuit diagram of the ESAM circuit in the photovoltaic protocol converter of this invention.

[0024] Figure 13 This is a circuit diagram of the FLASH circuit in the photovoltaic protocol converter of this invention. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be understood that the embodiments provided are for illustrative purposes only and are not intended to limit the scope of the invention. Those skilled in the art will be able to make various modifications and improvements without departing from the concept of the present invention, and these modifications and improvements are all within the scope of protection of the present invention.

[0026] The purpose of this invention is to utilize the advantages of power line carrier communication technology in photovoltaic power systems to improve the informatization and visualization of power systems, and to develop a new type of power electronic device based on power line carrier communication technology as the core and wireless communication and 485 communication as auxiliary technologies.

[0027] More specifically, this invention combines photovoltaic power generation with the inverter system and uses power line carrier communication technology to collect data and control the photovoltaic power system in real time, greatly improving the system's stability and real-time monitoring capabilities.

[0028] Therefore, the purpose of this invention is to design a photovoltaic protocol converter based on power line carrier communication technology, which enables information exchange among photovoltaic users by collecting and real-time monitoring their power generation and consumption information. Please refer to... Figure 1 The photovoltaic protocol converter includes: a power line carrier chip 00, a power supply filter circuit 10, a carrier coupling circuit 20, a zero-crossing circuit 30, a power amplifier circuit 40, a main control chip circuit 50, a 485 circuit 60, a clock circuit 70, a level conversion circuit 80, a wireless communication circuit 90, an ESAM circuit 100, and a FLASH circuit 110. The power line carrier chip 00 is simultaneously connected to the carrier coupling circuit 20, the zero-crossing circuit 30, the power amplifier circuit 40, the level conversion circuit 80, and the FLASH circuit 110. The main control chip circuit 50 is simultaneously connected to the 485 circuit 60, the clock circuit 70, the level conversion circuit 80, the wireless communication circuit 90, and the ESAM circuit 100. The power supply filter circuit 10 is connected to each of the above circuit modules, filtering the input power and inputting the filtered voltage to each of the above circuit modules to provide operating voltage for each circuit module of the photovoltaic protocol converter.

[0029] Continue to refer to Figure 1The power line carrier chip 00 modulates and demodulates the carrier signal through the carrier coupling circuit 20, and transmits the data via the power line, connecting to at least one grid concentrator. The power line carrier chip 00 transmits the output information to the grid concentrator through the carrier coupling circuit 20. In one specific embodiment, the circuit structure of the power line carrier chip 00 is as follows: Figure 2 As shown, a carrier chip U5 is used for implementation. The circuit mainly includes the carrier chip U5 and its peripheral circuits, as well as a crystal oscillator XL1. In an exemplary embodiment, the carrier chip U5 may be, for example, an LME3960A1 / QFN80 chip. Those skilled in the art should understand that this model is only an example, and other known carrier chips can be used instead. Their peripheral circuits are all known in the art and will not be described in detail here.

[0030] Continue to refer to Figure 1 The power filter circuit 10 is used to provide the operating voltage for the entire photovoltaic protocol converter. Specifically, the power filter circuit 10 and... Figure 1 The other circuit modules shown are all connected, and their function is to filter the input power supply and input the filtered voltage to the other circuit modules to provide them with operating voltage. In a specific embodiment, the circuit structure of the power supply filtering circuit 10 is as follows: Figure 3 As shown, it mainly includes: DC-DC power chip UA1, conducting diodes D7 and D8, energy storage inductors LA1 and LB1, energy storage capacitor CF1, DC-DC power chip U6, energy storage inductor L17, filter inductors L18 and L19, and feedback resistors R39 and R41.

[0031] Continue to refer to Figure 1 The carrier coupling circuit 20 is used to transmit the input information received by the power line carrier PLC to the power line carrier chip 00 via carrier coupling, and to transmit the output information of the power line carrier sent by the power line carrier chip 00 to the information processing device via carrier coupling and power lines. In a specific embodiment, the circuit structure of the carrier coupling circuit 20 is as follows: Figure 4 As shown, its circuit mainly includes a coupling transformer T1, a semiconductor discharge tube TSS1, a Zener diode TSS2, Schottky diodes D3 and D4, plus external filter resistors and capacitors.

[0032] The main function of the zero-crossing circuit 30 is to transmit information when it is determined that the power line is at a zero-crossing point. In a specific embodiment, the circuit structure of the zero-crossing circuit 30 is as follows: Figure 5 As shown, its circuit structure includes an overcurrent sampling chip U3, an optocoupler diode U4, and their peripheral circuits, where R18, R19, R21, and R22 are voltage divider resistors.

[0033] Continue to refer to Figure 1The power amplifier circuit 40 amplifies the signal output from the power line carrier chip 00, and then loads it onto the power line via the carrier coupling circuit 20 for transmission to the information processing device. In a specific embodiment, the circuit structure of the power amplifier circuit 40 is as follows: Figure 6 As shown, it is mainly implemented using a power amplifier chip U1, and the circuit structure includes the power amplifier chip U1 and its peripheral circuits.

[0034] Continue to refer to Figure 1 The main control chip circuit 50 processes the information transmitted from the 485 circuit 60, and then transmits the processed information to the external connection device via the 485 circuit 60. It also transmits the information to the power line carrier chip 00 via the level conversion circuit 80, and then the carrier coupling circuit 20 transmits the output information to the information processing device. In a specific embodiment, the circuit structure of the main control chip circuit 50 is as follows: Figure 7 As shown, it is implemented using a main control chip U7 (e.g., APM32E103RCT6). The circuit structure includes the main control chip U7 and its peripheral circuits, as well as the crystal oscillator Y1.

[0035] Continue to refer to Figure 1 The 485 circuit 60 is connected to an external inverter and is used to transmit information from the external inverter to the main control chip circuit 50, while simultaneously transmitting control commands from the main control chip circuit 50 back to the external inverter for interaction. In a specific embodiment, the circuit structure of the 485 circuit 60 is as follows: Figure 8 As shown, U8 is a 485 converter chip, VP8, VP9, ​​D5, and D7 are Zener diodes, along with other resistors and capacitors.

[0036] The clock circuit 70 stores the device time and transmits the information to the information processing device via the main control chip circuit 50. In an exemplary embodiment, the circuit structure of the clock circuit 70 is as follows: Figure 9 As shown, it is an RTC (real-time) clock, which is implemented using a clock chip U5 (such as RX8025T-UB). The circuit structure includes the clock chip U5 and its peripheral circuits.

[0037] Continue to refer to Figure 1 The level conversion circuit 80 is used to convert the serial port signal between the main control chip circuit 50 and the power line carrier chip 00, serving as both a level conversion and protection circuit. In an exemplary embodiment, the circuit structure of the level conversion circuit 80 is as follows: Figure 10 As shown, Q1 and Q2 are transistors, D9 is a diode, and other pull-up resistors are also included.

[0038] Continue to refer to Figure 1The wireless communication circuit 90 is connected to the main control chip circuit 50 and is used for remotely upgrading the main control chip circuit 50. In an exemplary embodiment, the circuit structure of the wireless communication circuit 90 is as follows: Figure 11 As shown, it is implemented using a wireless communication chip U10 (such as BLE02D), and the circuit structure includes the wireless communication chip U10 and its peripheral circuits.

[0039] Continue to refer to Figure 1 The ESAM (Embedded Secure Access Module) circuit 100 is connected to the main control chip circuit 50 and is used to encrypt the meter number of the photovoltaic protocol converter. In an exemplary embodiment, the circuit structure of the ESAM circuit 100 is as follows: Figure 12 As shown, it is implemented using the ESAM chip U9, and the circuit structure includes the ESAM chip U9 and its peripheral circuits.

[0040] Continue to refer to Figure 1 The FLASH circuit 110 is connected to the power line carrier chip 00, and one exemplary circuit structure is as follows: Figure 13 As shown, this can be achieved using a U4 memory chip (such as BY25Q32CSTIG).

[0041] The above description, in conjunction with specific preferred embodiments, provides a further detailed explanation of the present invention. It should not be construed that the specific implementation of the present invention is limited to these descriptions. For those skilled in the art, several equivalent substitutions or obvious modifications can be made without departing from the concept of the present invention, and all such modifications, achieving the same performance or purpose, should be considered within the scope of protection of the present invention.

Claims

1. A photovoltaic protocol converter based on power line carrier communication technology, characterized in that, include: Power line carrier chip, power supply filter circuit, carrier coupling circuit, zero-crossing circuit, power amplifier circuit, main control chip circuit, 485 circuit, clock circuit and level conversion circuit; The power line carrier chip modulates and demodulates the carrier signal through the carrier coupling circuit, and transmits the data through the power line and connects to at least one power grid concentrator. The power filtering circuit provides the operating voltage for the photovoltaic protocol converter by filtering the input power supply; The carrier coupling circuit is used to transmit the input information received by the power line carrier to the power line carrier chip through carrier coupling, and to transmit the output information of the power line carrier sent by the power line carrier chip to the information processing device through carrier coupling and power line. The zero-crossing circuit transmits information by determining when the power line crosses zero. The power amplifier circuit is used to amplify the signal output by the power line carrier chip, and then load it onto the power line via the carrier coupling circuit and transmit it to the information processing device. The main control chip circuit is used to process the information transmitted from the 485 circuit, and then transmit the processed information to the external connection device via the 485 circuit. It is also used to transmit the information to the power line carrier chip through the level conversion circuit, and then the carrier coupling circuit transmits the output information to the information processing device. The 485 circuit is used to transmit information from the external inverter to the main control chip circuit, and at the same time, the control commands of the main control chip circuit are transmitted back to the external inverter for interaction. The clock circuit is used to store the device time and transmits the information to the information processing device through the main control chip circuit; The level conversion circuit is used to convert the serial port signal between the main control chip circuit and the power line carrier chip, serving as a level conversion and protection circuit.

2. The photovoltaic protocol converter as described in claim 1, characterized in that, The power line carrier chip transmits the output information to the power grid concentrator through the carrier coupling circuit.

3. The photovoltaic protocol converter as described in claim 1, characterized in that, Also includes: A wireless communication circuit, connected to the main control chip circuit, is used for remotely upgrading the main control chip circuit.

4. The photovoltaic protocol converter as described in claim 3, characterized in that, Also includes: The ESAM circuit, connected to the main control chip circuit, is used to encrypt the meter number of the photovoltaic protocol converter.

5. The photovoltaic protocol converter as described in claim 4, characterized in that, Also includes: The FLASH circuit is connected to the power line carrier chip.

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