Protocol converter

Abstract

The protocol converter comprises a circuit board, an EEPROM (Electrically Erasable Programmable Read-Only Memory) storage module, an interface circuit module and a clock holding module, the circuit board is electrically connected with a power supply circuit module and a carrier communication processing module, the power supply circuit module supplies power to the carrier communication processing module, the EEPROM storage module stores configuration data and historical data, and the interface circuit module stores the configuration data and the historical data. The interface circuit module realizes communication between the carrier communication processing module and external equipment; the photovoltaic inverter is connected with the protocol converter through an RS-485I communication line, and exchanges data with the concentrator through a power line carrier; a distributed photovoltaic management platform is helped to realize the functions of automatic acquisition of power generation and power utilization information of photovoltaic users, metering abnormity monitoring, power quality monitoring, distributed energy monitoring, information interaction of intelligent power utilization equipment and the like, so as to realize group dispatching and group control, flexible grid-connected control and a distributed photovoltaic low-voltage flexible interconnection control system.

Description

Technical Field

[0001] The utility model relates to the technical field of photovoltaic power generation, in particular to a protocol converter. Background Art

[0002] The photovoltaic power generation system mainly includes solar cell modules, inverters, photovoltaic box-type transformers and photovoltaic box-type transformer measurement and control devices. The photovoltaic box-type transformer measurement and control device is the core protection device of the entire photovoltaic monitoring system. It mainly solves the problems that affect the safe and stable operation of the photovoltaic box-type transformer and reasonably arranges the inspection and maintenance of electrical equipment, thereby realizing remote management and automatic monitoring of various information of the photovoltaic box-type transformer.

[0003] In related technologies, traditional PV box-type transformer measurement and control devices transmit data via RS485 interfaces to the communication management unit of each power generation array. Simultaneously, other intelligent devices such as inverters, combiner boxes, and energy meters also transmit data to the communication management unit via RS485 interfaces. However, in the transition to active networks with two-way interaction between supply and demand, traditional networks typically use fixed point-to-point connections, lacking flexibility in response to changing business needs and making it difficult to adapt to the continuous access of distributed photovoltaics. Traditional network topologies are complex, with numerous devices and network topologies, increasing the difficulty of network management and maintenance. Utility Model Content

[0004] The purpose of the present invention is to provide a protocol converter to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned object, the present invention provides the following technical solution: a protocol converter, comprising a circuit board, a power supply circuit module and a carrier communication processing module being electrically connected to the circuit board, the power supply circuit module supplying power to the carrier communication processing module, the power supply circuit module using a single-phase AC power supply, the AC magnetic flux density generated in the working state being less than 0.5 mT, the power supply circuit module having a rated voltage of 220 V with an allowable deviation of -20% to +20%; a frequency of 50 Hz with an allowable deviation of -6% to +2%;

[0006] The carrier communication processing module collects power generation information from several photovoltaic inverters and exchanges data with the concentrator via the power carrier. The carrier communication processing module collects data from the photovoltaic inverters at the minute level. The collected data items include voltage, active power, reactive power, and power factor. The minute-level collection function and collection time interval can be set through remote or local commands for tasks and plans.

[0007] An EEPROM storage module, the EEPROM storage module being electrically connected to the carrier communication processing module via a circuit board, and the EEPROM storage module storing configuration data and historical data;

[0008] An interface circuit module, the interface circuit module being electrically connected to the carrier communication processing module via a circuit board, and the interface circuit module enabling communication between the carrier communication processing module and an external device;

[0009] A clock holding module is electrically connected to the carrier communication processing module and the EEPROM storage module through a circuit board, and the absolute value of the daily timing error of the clock holding module is ≤0.5s / d.

[0010] Furthermore, the circuit board is electrically connected to a Bluetooth module, which is electrically connected to the carrier communication processing module and the EEPROM storage module, and is used to set parameters and read inverter data; the circuit board is electrically connected to an RS-485 interface module, which is electrically connected to the interface circuit module, and is used to set parameters and read inverter data. Local maintenance of the protocol converter can be achieved through both the RS-485 interface module and the Bluetooth module.

[0011] Furthermore, an indicator light module is electrically connected to the circuit board, and the indicator light module is electrically connected to the carrier communication processing module. The indicator light module displays the working status, making it easy to check the working status.

[0012] Compared with the existing technology, the beneficial effects of the present invention are as follows: the photovoltaic inverter and the protocol converter are connected to the protocol converter through the RS-485I communication line, and the carrier communication processing module can collect the power generation information of a single or multiple photovoltaic inverters, and exchange data with the concentrator through the power carrier; it helps the distributed photovoltaic management platform to realize the automatic collection of photovoltaic users' power generation and power consumption information, metering anomaly monitoring, power quality monitoring, distributed energy monitoring, information interaction of intelligent power equipment and other functions, so as to realize group modulation and control, flexible grid-connected control, and realize distributed photovoltaic low-voltage flexible interconnected control system. BRIEF DESCRIPTION OF THE DRAWINGS

[0013] Figure 1 This is a circuit diagram of the radio frequency part of the carrier communication processing module of the utility model;

[0014] Figure 2 This is a circuit diagram of the communication chip and clock holding module of the carrier communication processing module of the utility model;

[0015] Figure 3 This is the status circuit diagram of the indicator light module of the utility model;

[0016] Figure 4 This is a circuit diagram of the indicator light module of the utility model;

[0017] Figure 5 This is a circuit diagram of the interface circuit module of the utility model;

[0018] Figure 6 This is a conversion circuit diagram of the interface circuit module of the utility model;

[0019] Figure 7 This is a circuit diagram of the power circuit module of the utility model;

[0020] Figure 8 This is the circuit diagram of the Bluetooth module of the utility model;

[0021] Figure 9 This is the CPU circuit diagram of the carrier communication processing module of the utility model;

[0022] Figure 10 This is a circuit diagram stored in the FLASH of the carrier communication processing module of the present invention;

[0023] Figure 11 This is the circuit diagram of the RS-485 interface module of the utility model. DETAILED DESCRIPTION

[0024] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0025] Example:

[0026] See also Figure 1-11 The utility model provides a technical solution: a protocol converter, comprising a circuit board, a power circuit module and a carrier communication processing module electrically connected to the circuit board, the power circuit module supplies power to the carrier communication processing module, the carrier communication processing module collects power generation information of a plurality of photovoltaic inverters and exchanges data with a concentrator via a power carrier;

[0027] The uplink communication mode of the carrier communication processing module supports the use of power line carrier HPLC / dual mode, adopting a pluggable module mode, the downlink communication mode supports the use of RS-485, and the maintenance channel supports the use of Bluetooth and RS-485;

[0028] The communication rates of the protocol converter are as follows: The baud rate of the upstream power line carrier communication supports 115200bps, the parity check mode is even parity, the data bit is 8 bits, and the stop bit is 1 bit. The maintenance RS-485 interface communication baud rate defaults to 9600bps, the parity check mode is even parity, the data bit is 8 bits, and the stop bit is 1 bit. When used as a maintenance interface, it supports a maximum of 115200bps. The downstream RS-485 interface communication baud rate defaults to 9600bps, the parity check mode is no parity, the data bit is 8 bits, and the stop bit is 1 bit. It can adapt to the inverter 485 interface rate to achieve automatic matching of the serial port;

[0029] An EEPROM storage module, the EEPROM storage module being electrically connected to the carrier communication processing module via a circuit board, and the EEPROM storage module storing configuration data and historical data;

[0030] An interface circuit module, the interface circuit module being electrically connected to the carrier communication processing module via a circuit board, and the interface circuit module enabling communication between the carrier communication processing module and an external device;

[0031] A clock holding module is electrically connected to the carrier communication processing module and the EEPROM storage module through a circuit board.

[0032] In this embodiment, the power supply circuit module uses AC single-phase power supply, and the AC magnetic flux density generated in the working state is less than 0.5mT. The rated voltage of the power supply circuit module is 220V, with an allowable deviation of -20% to +20%; the frequency is 50Hz, with an allowable deviation of -6% to +2%; the apparent power consumed by the protocol converter in the non-communication state should not exceed 5VA, and the active power should not exceed 3W; the apparent power consumed in the communication state should not exceed 8VA, and the active power should not exceed 5W.

[0033] In this embodiment, after a power outage, no data should be misread. When the power is restored, the saved data is not lost. The absolute value of the daily time error of the clock holding module is ≤0.5s / d.

[0034] In this embodiment, a Bluetooth module is electrically connected to the circuit board. The Bluetooth module is electrically connected to the carrier communication processing module and the EEPROM storage module. The Bluetooth module is used to set parameters and read inverter data.

[0035] In this embodiment, an RS-485 interface module is electrically connected to the circuit board. The RS-485 interface module is electrically connected to the interface circuit module. The RS-485 interface module is used to set parameters and read inverter data.

[0036] In this embodiment, an indicator light module is electrically connected to the circuit board, the indicator light module is electrically connected to the carrier communication processing module, and the indicator light module displays the working status.

[0037] The data collection functions of the protocol converter (hereinafter referred to as the converter) are as follows:

[0038] 1. Electricity data collection

[0039] The converter supports transparent and automatic collection of inverter data. It collects data on a minute-by-minute basis for all connected inverters, including voltage, active power, reactive power, and power factor. This minute-by-minute collection function and the interval between collections can be configured remotely or locally.

[0040] 2. Inverter data collection process description

[0041] a. When collecting data from the inverter, the converter first sends a switching command, instructing the adapter to switch to the grid's 485 channel. b. After receiving the command, the adapter must switch based on the cloud platform's data collection and respond with a response. c. After receiving the successful switching command from the adapter, the converter normally sends the Modbus protocol to collect inverter data. d. After the data collection is complete, the converter sends a switching command, instructing the adapter to switch to the inverter manufacturer's communication channel.

[0042] 3. Accuracy of collected data

[0043] The data collected by the converter from the inverter should be consistent with the inverter's indication. The converter's wired downlink channel reading success rate is >99%.

[0044] 4. Communication Protocol

[0045] The converter's uplink communication protocol supports DL / T698.45 and its extended protocols.

[0046] The downlink communication protocol supports the Modbus protocol used by major PV inverter manufacturers, including Ginlong, Growatt, GoodWe, Huawei, AISWEI, Sungrow, Chint, SAJ, and Sohang. It also supports extended protocols for communication with adapters.

[0047] 5.Support multiple readings with one copy

[0048] The converter supports two photovoltaic inverters and can realize data collection and control of multiple devices.

[0049] 6. Automatic protocol recognition

[0050] The converter supports the automatic identification function of the downstream Modbus protocol. The converter automatically identifies all inverter protocols connected to it and automatically converts the upstream DL / T698.45 protocol into the corresponding Modbus protocol for communication.

[0051] 7.Data forwarding function

[0052] The converter supports data forwarding between the concentrator and the inverter.

[0053] The functional configuration of the converter shall comply with the provisions of Table 1.

[0054] Table 1. Data acquisition function configuration of the converter

[0055]

[0056]

[0057] 8. Parameter setting and query function

[0058] The converter supports setting and querying parameters through the maintenance port, including clock, address, data aging time, etc.

[0059] The converter has a timing unit, and the absolute value of the daily timing error of the timing unit should be ≤0.5s / d. The converter can receive clock call and time synchronization commands from the concentrator or local handheld device.

[0060] 9. Local Features

[0061] The converter has status lights indicating operation, uplink communication, and downlink communication. The converter supports handheld devices to set parameters and read inverter data on-site via the Bluetooth communication interface and maintenance RS-485 interface.

[0062] 10. Maintenance function

[0063] The converter has self-checking and self-recovery functions.

[0064] The converter can detect whether the upstream and downstream communication units are working normally and can automatically recover when communication is abnormal.

[0065] After receiving the initialization command from the local maintenance interface, the converter initializes the hardware, parameter area, and data area respectively, sets the parameter area to the default value, and clears the data area to zero.

[0066] 11. Converter status indication

[0067] Running light - running status indicator light, red, the light flashes alternately for one second on and one second off, indicating that the converter is operating normally, and the light is always off, indicating that there is no power;

[0068] Carrier light - carrier communication status indicator, red and green, flashing red light indicates that the converter carrier channel is receiving data, and flashing green light indicates that the converter carrier channel is sending data;

[0069] Maintenance / uplink communication light - maintenance / uplink communication status indicator, red and green dual color, red light flashing means the converter uplink channel is receiving data, green light flashing means the converter uplink channel is sending data;

[0070] Downlink communication light - Downlink communication status indicator light, red and green. The red light flashes when the converter's downlink channel receives data, and the green light flashes when the converter's downlink channel sends data.

[0071] Although the embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and variations may be made to these embodiments without departing from the principles and spirit of the present invention, and the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A protocol converter, characterized in that: include: A circuit board, to which a power circuit module and a carrier communication processing module are electrically connected, the power circuit module supplies power to the carrier communication processing module, and the carrier communication processing module collects power generation information of a plurality of photovoltaic inverters and exchanges data with a concentrator via a power carrier; An EEPROM storage module, the EEPROM storage module being electrically connected to the carrier communication processing module via a circuit board, and the EEPROM storage module storing configuration data and historical data; An interface circuit module, the interface circuit module being electrically connected to the carrier communication processing module via a circuit board, and the interface circuit module enabling communication between the carrier communication processing module and an external device; A clock holding module is electrically connected to the carrier communication processing module and the EEPROM storage module through a circuit board.

2. A protocol converter according to claim 1, characterized in that: The power circuit module uses AC single-phase power supply, and the AC magnetic flux density generated in the working state is less than 0.5mT. The rated voltage of the power circuit module is 220V, with an allowable deviation of -20% to +20%; the frequency is 50Hz, with an allowable deviation of -6% to +2%.

3. The protocol converter according to claim 1, wherein: The absolute value of the daily timing error of the clock holding module is ≤0.5s / d.

4. The protocol converter according to claim 1, wherein: The circuit board is electrically connected to a Bluetooth module, which is electrically connected to the carrier communication processing module and the EEPROM storage module. The Bluetooth module is used to set parameters and read inverter data.

5. The protocol converter according to claim 1, wherein: The circuit board is electrically connected to an RS-485 interface module, which is electrically connected to the interface circuit module. The RS-485 interface module is used to set parameters and read inverter data.

6. The protocol converter according to claim 1, wherein: An indicator light module is electrically connected to the circuit board, the indicator light module is electrically connected to the carrier communication processing module, and the indicator light module displays the working status.

7. The protocol converter according to claim 1, wherein: The carrier communication processing module collects data from the photovoltaic inverter at the minute level. The collected data items include voltage, active power, reactive power, and power factor. The minute-level collection function and the collection time interval can be set through remote or local commands for tasks and plans.

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