Four-fusion monitoring terminal

Abstract

The utility model relates to the technical field of monitoring terminals, in particular to a four-fusion monitoring terminal, which comprises a terminal body, the terminal body comprises an upper shell and a mounting base, a rectangular groove facing inwards is formed in the front of the upper shell, and a multimode communication module is adaptively mounted in the rectangular groove; an electric energy sampling module, a protocol conversion module, an open circuit protection module, a microcontroller and a power supply module are arranged in the terminal body, the microcontroller is electrically connected with the electric energy sampling module, the protocol conversion module and the multimode communication module, and the open circuit protection module is electrically connected with the power supply module. By integrating the structures of the multimode communication module, the electric energy sampling module, the protocol conversion module, the microcontroller and the like, the problem that a communication interface and a communication protocol of the photovoltaic inverter are not uniform is solved, the functions of harmonic detection, open circuit protection and the like on a high-voltage power grid line can be realized, and the safety and the reliability of photovoltaic grid connection are improved.

Description

TECHNICAL FIELD

[0001] The utility model relates to monitoring terminal technical field, concretely is a four can fuse monitoring terminal. BACKGROUND

[0002] Distributed photovoltaic has the characteristics such as dispersity, randomness, intermittence, due to the limitation of the end of power grid capacity, mass distributed photovoltaic access power grid, caused power grid flow direction change, local voltage over-limit, relay protection misoperation and many other problems. Therefore, the State Grid Corporation proposes that all photovoltaic grid-connected access must realize the "four can" requirements of observability, measurability, adjustability and controllability.

[0003] But due to the distributed photovoltaic inverter and other assets belonging to the user, and there is no inverter communication interface and communication protocol and other related standards can be executed in the early stage, leading to hundreds of brands of inverter communication interface and communication protocol are different, different types of photovoltaic inverter when wiring monitoring interface can not be unified matching, need again single configuration photovoltaic interface converter and photovoltaic protocol converter;At the same time, for the photovoltaic power generation system grid operation of high-voltage line, the scene also needs to increase a photovoltaic grid-connected monitoring unit to realize the acquisition and control of inverter, leading to hardware cost, construction cost, construction complexity etc. are very high, the debugging efficiency is extremely low. UTILITARIAN CONTENT

[0004] In order to solve the above problems, the utility model provides a kind of four can fusion monitoring terminal, including terminal body, the terminal body includes upper shell and installation base, the upper and lower ends of the installation base are provided with the terminal portion of integrally formed wiring terminal;The wiring terminal portion includes input wiring terminal and output wiring terminal, input wiring terminal is used to be electrically connected with photovoltaic inverter;Output wiring terminal is used to be connected with high-voltage grid line;

[0005] The upper shell is fixedly installed in the middle part of installation base, the front of the upper shell is provided with the rectangular recess towards interior, the rectangular recess is adapted to install multimode communication module;The terminal body is internally provided with electric energy sampling module, protocol conversion module, circuit protection module, microcontroller and power supply module, and the microcontroller is electrically connected with electric energy sampling module, protocol conversion module, multimode communication module, circuit protection module and power supply module respectively electrically connected;

[0006] The electric energy sampling module includes current sensor, signal conditioning circuit, analog-digital converter and metering chip;The current sensor is respectively connected in series on input wiring terminal and output wiring terminal, and the current sensor is electrically connected with signal conditioning circuit;The signal conditioning circuit is electrically connected with metering chip through analog-digital converter.

[0007] In order to realize the detection of harmonic power of high-voltage power grid line, the signal conditioning circuit comprises a step-down conversion circuit, an isolation filter circuit and a signal amplification circuit, and the step-down conversion circuit is connected with the signal amplification circuit through the isolation filter circuit.

[0008] In the specific embodiment, the step-down conversion circuit comprises a sampling resistor R1, a sampling resistor R2, a resistor R3 and an operational amplifier U1, the sampling resistor R1 is connected with the reverse input end of the operational amplifier U1, the sampling resistor R2 is respectively connected with one end of the resistor R3 and the positive input end of the operational amplifier U1, the other end of the resistor R3 is grounded, and the output end of the operational amplifier U1 is connected with the isolation filter circuit.

[0009] In order to realize the uploading of monitoring data of the four-fusion monitoring terminal, the multi-mode communication module comprises a carrier communication unit, a conversion unit and an Ethernet communication unit, and can support dual-mode carrier communication and network communication transmission.

[0010] In order to realize the communication information transmission with the photovoltaic inverter, the upper shell is further provided with a communication interface terminal, and the communication interface terminal comprises an RJ45 interface and an RS485 wiring terminal.

[0011] Meanwhile, the communication interface terminal is located at the front side of the wiring terminal part and avoids the screw tightening direction of the wiring terminal part, so as to facilitate normal line installation.

[0012] The power supply module is electrically connected with the single-phase incoming line terminal of the input wiring terminal and takes power from the A-phase input wiring terminal.

[0013] The protocol conversion module comprises a protocol conversion chip and a register, the protocol conversion chip is electrically connected with the register, and the protocol conversion chip samples APM32E103.

[0014] In order to realize the controllable operation of the four-fusion monitoring terminal, the circuit protection module is provided with an electronic tripper.

[0015] In order to facilitate the equipment maintenance of daily inspection personnel, the upper shell is further embedded with a display screen and function keys for operation, and the display screen and the function keys are respectively electrically connected with the microcontroller.

[0016] The beneficial effect is that the utility model provides a four can fuse monitoring terminal, through the structure such as integrated multimode communication module, electric energy sampling module, protocol conversion module, circuit protection module, microcontroller and power supply module, solve the problem that distributed photovoltaic inverter communication interface and communication protocol are not unified, realize the unified monitoring and control to different brand, different model photovoltaic inverter. This terminal can collect photovoltaic inverter electric energy data in real time, upload to the superior station concentrator, and adjust photovoltaic inverter output power according to control instruction, at the same time, the four can fuse monitoring terminal can realize the harmonic detection of high voltage power grid line, circuit protection, off-grid control and other functions, improve the security and reliability of photovoltaic grid connection, realize the observability, measurability, adjustability, controllability of photovoltaic grid connection, reduce hardware cost, construction cost and debugging complexity, improve the debugging efficiency. BRIEF DESCRIPTION OF DRAWINGS

[0017] Figure 1 It is terminal body structure diagram of four can fuse monitoring terminal;

[0018] Figure 2 It is circuit diagram of four can fuse monitoring terminal;

[0019] Figure 3 It is buck conversion circuit diagram;

[0020] 1, upper shell;2, mounting base;3, terminal portion;4, multimode communication module;5, communication interface terminal;6, display screen;7, function button. DETAILED DESCRIPTION

[0021] The exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings.

[0022] Referring to Figures 1-2 The embodiment provides a four can fuse monitoring terminal, including terminal body, the terminal body includes upper shell 1 and mounting base 2, the upper and lower ends of mounting base 2 are provided with the terminal portion 3 of integrated molding;The terminal portion 3 includes input terminal and output terminal, wherein the input terminal is electrically connected with photovoltaic inverter, for receiving photovoltaic electric energy of photovoltaic inverter inversion conversion;The output terminal is connected with high voltage power grid line, for inputting photovoltaic electric energy into high voltage power grid line, realizes photovoltaic grid connection.

[0023] The upper shell 1 is fixedly installed on the middle part of the mounting base 2, a rectangular recess is formed in the front of the upper shell 1 and faces the inside, the rectangular recess is adapted to install a multi-mode communication module 4, the multi-mode communication module 4 can enable the four-fusible monitoring terminal to be in communication connection with a superior station concentrator, upload the collected data of the four-fusible monitoring terminal, and receive the instruction information of the superior station concentrator. Meanwhile, the multi-mode communication module 4 comprises a carrier wave communication unit, a conversion unit and an Ethernet communication unit, can support dual-mode carrier wave communication and network communication transmission, and realizes the observable functions of the four-fusible monitoring terminal.

[0024] The terminal body is internally provided with an electric energy sampling module, a protocol conversion module, a circuit protection module, a microcontroller and a power supply module, the microcontroller is electrically connected with the electric energy sampling module, the protocol conversion module, the multi-mode communication module 4 and the circuit protection module respectively. The power supply module is electrically connected with the single-phase incoming line terminal of the input terminal, takes electricity from the A-phase input terminal, is electrically connected with the microcontroller, and provides power supply for the four-fusible monitoring terminal.

[0025] The electric energy sampling module is electrically connected with the input terminal and the output terminal, on one hand, the electric energy sampling module can collect data of the input electric energy of the photovoltaic inverter, on the other hand, the electric energy sampling module can collect electric energy data of the high-voltage power grid line, detects the harmonics of the high-voltage power grid line, and is used for the four-fusible monitoring terminal to switch between grid-connected and off-grid of the photovoltaic inverter.

[0026] In order to realize the harmonic monitoring of the electric energy sampling module on the high-voltage power grid line, the electric energy sampling module comprises a current sensor, a signal conditioning circuit, an analog-to-digital converter and a metering chip. The current sensor adopts a Hall current sensor, the Hall current sensor is connected in series between the input terminal and the output terminal, the Hall current sensor is electrically connected with the signal conditioning circuit, a voltage signal is generated at the secondary side of the Hall current sensor through the mutual inductance principle, and the signal conditioning circuit receives the voltage and current signals for further processing. The signal conditioning circuit comprises a step-down conversion circuit, an isolation filter circuit and a signal amplification circuit, the step-down conversion circuit is connected with the isolation filter circuit and the signal amplification circuit, the step-down conversion circuit samples the voltage detected by the Hall circuit sensor, outputs a proportional voltage, removes high-frequency noise through the isolation filter, and is amplified twice through the signal amplification circuit. The signal conditioning circuit inputs the processed voltage signal to the analog-to-digital converter, the analog-to-digital converter converts the input electric signal into a digital signal and transmits it to the metering chip, and the metering chip performs final electric energy metering processing, and the metering chip adopts an ATT7022E chip.

[0027] As Figure 3As shown, the voltage reduction conversion circuit includes a sampling resistor R1, a sampling resistor R2, a resistor R3 and an operational amplifier U1, the sampling resistor R1 is connected to the reverse input end of the operational amplifier U1, the sampling resistor R2 is respectively connected to one end of the resistor R3 and the positive input end of the operational amplifier U1, the other end of the resistor R3 is grounded, and the output end of the operational amplifier U1 is connected to the isolation filter circuit. The voltage reduction conversion circuit reduces the voltage on the high-voltage side to the detection voltage range of the electric energy sampling module through two sampling resistors.

[0028] The four-fusion monitoring terminal realizes the monitoring and sampling of the output electric energy of the photovoltaic inverter through the electric energy sampling module, and uploads in real time to the distribution area concentrator through the multi-mode communication module 4. When receiving the regulation and control instruction of the distribution area concentrator, the regulation and control instruction is converted into a power adjustment signal recognizable by the photovoltaic inverter by the protocol conversion module, and is further transmitted to the photovoltaic inverter. In order to realize the communication control of different models of photovoltaic inverters, the protocol conversion module includes a protocol conversion chip and a register, the protocol conversion chip is electrically connected with the register, the protocol conversion chip is APM32E103, and the register stores the communication protocols of multiple photovoltaic inverters and can dynamically load the protocol library.

[0029] In addition, in order to realize the communication transmission between the four-fusion monitoring terminal and the photovoltaic inverter, the upper shell 1 is also provided with a communication interface terminal 5, one end of which is connected with the protocol conversion module, and the other end is connected with the photovoltaic inverter through a cable, and the communication interface terminal 5 includes an RJ45 interface and an RS485 wiring terminal. The communication interface terminal 5 is located on the front side of the wiring terminal part 3, and avoids the screw tightening direction of the wiring terminal part 3.

[0030] In order to realize the on-off grid control of the four-fusion monitoring terminal, the circuit breaker protection module is provided with an electronic release, which can control the on-off of electricity according to the trigger signal of the microcontroller. When the electric energy sampling module detects that there is a harmonic current in the high-voltage power grid line, the microcontroller actively triggers the circuit breaker protection module to perform circuit protection; when the multi-mode communication module 4 receives the on-grid instruction of the upper-level distribution area concentrator, the microcontroller triggers the circuit breaker protection module to automatically close and power on, realizing the on-grid power generation of photovoltaic electric energy.

[0031] In order to realize the daily inspection and maintenance of the four-fusion monitoring terminal, the upper shell 1 is also embeddedly installed with a display screen 6 and a function button 7 for operation, the display screen 6 and the function button 7 are respectively electrically connected with the microcontroller, and the power grid inspection personnel can control and view the detection data and operating state of the four-fusion monitoring terminal through the display screen 6 and the function button 7.

Claims

1. A four-fusible monitoring terminal, characterized by comprising: The terminal body comprises an upper shell and a mounting base, and the mounting base is provided with an integrally-formed wiring terminal part at its upper and lower ends; the wiring terminal part comprises an input wiring terminal and an output wiring terminal, the input wiring terminal is used for electrical connection with a photovoltaic inverter, and the output wiring terminal is used for connection with a high-voltage power grid line; The upper shell is fixedly mounted on the middle part of the mounting base, a rectangular recess is formed in the front face of the upper shell and faces the interior, and the rectangular recess is adapted to mount a multi-mode communication module; the terminal body is internally provided with an electric energy sampling module, a protocol conversion module, a circuit breaker protection module, a microcontroller and a power supply module, and the microcontroller is electrically connected with the electric energy sampling module, the protocol conversion module, the multi-mode communication module, the circuit breaker protection module and the power supply module, respectively. The electric energy sampling module comprises a current sensor, a signal conditioning circuit, an analog-to-digital converter and a metering chip; the current sensor is connected in series with the input wiring terminal and the output wiring terminal, respectively, and the current sensor is electrically connected with the signal conditioning circuit; the signal conditioning circuit is electrically connected with the metering chip through the analog-to-digital converter.

2. The four-fusible monitoring terminal according to claim 1, characterized by The signal conditioning circuit comprises a step-down conversion circuit, an isolation filter circuit and a signal amplification circuit, and the step-down conversion circuit is connected with the isolation filter circuit and the signal amplification circuit.

3. The four-fusible monitoring terminal according to claim 2, wherein The step-down conversion circuit comprises a sampling resistor R1, a sampling resistor R2, a resistor R3 and an operational amplifier U1, the sampling resistor R1 is connected with the reverse input end of the operational amplifier U1, the sampling resistor R2 is connected with one end of the resistor R3 and the positive input end of the operational amplifier U1, respectively, the other end of the resistor R3 is grounded, and the output end of the operational amplifier U1 is connected with the isolation filter circuit.

4. The four-fusible monitoring terminal according to claim 1, wherein The multi-mode communication module comprises a carrier communication unit, a conversion unit and an Ethernet communication unit.

5. The four-fusible monitoring terminal according to claim 1, wherein The upper shell is further provided with a communication interface terminal, and the communication interface terminal comprises an RJ45 interface and an RS485 wiring terminal.

6. The four-fusible monitoring terminal according to claim 5, wherein The communication interface terminal is located on the front side of the wiring terminal part and avoids the screw tightening direction of the wiring terminal part.

7. The four-fusible monitoring terminal according to claim 1, wherein The power supply module is electrically connected with the single-phase incoming terminal of the input wiring terminal and takes power from the A-phase input wiring terminal.

8. The four-fusible monitoring terminal according to claim 1, wherein The protocol conversion module comprises a protocol conversion chip and a register, the protocol conversion chip is electrically connected with the register, and the protocol conversion chip is an APM32E103.

9. The four-fusible monitoring terminal according to claim 1, wherein The circuit breaker protection module is provided with an electronic release.

10. The four-fusible monitoring terminal according to claim 1, wherein The upper shell is further embeddedly mounted with a display screen and functional keys for operation, and the display screen and the functional keys are electrically connected with the microcontroller, respectively.

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