Photovoltaic inverter detection terminal

Abstract

The utility model discloses a photovoltaic inverter detection terminal. The terminal comprises an output electric quantity acquisition unit, an input voltage acquisition circuit, a switching value input circuit, a temperature acquisition circuit, an arc light acquisition unit, a master controller, a communication module and a relay control circuit, the communication module is used for sending the electric quantity parameter, the input voltage signal, the operation state signal, the temperature signal and the arc light signal to a cloud server under the control of the main controller, and receiving a remote control instruction sent by the cloud server; the relay control circuit is connected with the master controller, and the master controller controls the relay control circuit to work when any one of the electric quantity parameters, the input voltage signal, the temperature signal and the arc light signal exceeds a set threshold value or receives a remote control instruction so as to control the operation state of the photovoltaic inverter. According to the utility model, the collected signal is sent to the cloud server, and the operation state of the photovoltaic inverter can be controlled according to the remote control instruction, so that the remote monitoring and control requirements can be met.

Description

TECHNICAL FIELD

[0001] The utility model relates to photovoltaic inverter protection technical field, concretely relates to a photovoltaic inverter detection terminal. BACKGROUND

[0002] The photovoltaic inverter is the equipment for converting the direct current voltage generated by the photovoltaic panel into alternating voltage, and is one of the important components in the photovoltaic array system. The traditional photovoltaic inverter is a relatively independent device, and the current, temperature and other parameters of the photovoltaic inverter are collected locally to ensure the safe operation of the inverter, the monitoring function is relatively simple, and remote monitoring and control cannot be performed. With the expansion of the scale of the photovoltaic system and the development of intelligent technology, the photovoltaic inverter remote centralized monitoring control has obvious advantages and becomes the main development direction. The new photovoltaic inverter has the remote monitoring and control function, but the original photovoltaic inverters in the market still have certain use value. In order to make the original photovoltaic inverters meet the remote monitoring and control function, a detection terminal is needed to collect the related parameters of the photovoltaic inverter, and the corresponding control action can be performed according to the remote control instruction. SUMMARY

[0003] The utility model aims at the deficiency existing in prior art, provides a photovoltaic inverter detection terminal.

[0004] In order to achieve the above-mentioned purpose, the utility model provides a photovoltaic inverter detection terminal, comprising:

[0005] The output power acquisition unit is used to collect the power parameters output by the photovoltaic inverter.

[0006] The input voltage acquisition circuit is used to collect the input voltage signal of the photovoltaic inverter.

[0007] The on-off input circuit is used to obtain the running state signal of the photovoltaic inverter.

[0008] The temperature acquisition circuit is used to collect the temperature signal inside the photovoltaic inverter.

[0009] The arc light acquisition unit is used to collect the arc light signal inside the photovoltaic inverter.

[0010] The main control unit is connected with the output power acquisition unit, input voltage acquisition circuit, on-off input circuit, temperature acquisition circuit and arc light acquisition unit respectively to receive the power parameters collected by the output power acquisition unit, the input voltage signal collected by the input voltage acquisition circuit, the running state signal collected by the on-off input circuit, the temperature signal collected by the temperature acquisition circuit and the arc light signal collected by the arc light acquisition unit, and to judge whether the received power parameters, input voltage signal, temperature signal and arc light signal are respectively within the set threshold range.

[0011] The communication module is connected with the master controller, and is used for transmitting the electric quantity parameter, the input voltage signal, the running state signal, the temperature signal and the arc light signal to a cloud server under the control of the master controller, receiving a remote control instruction sent by the cloud server, and transmitting the remote control instruction to the master controller.

[0012] The relay control circuit is connected with the master controller, and the master controller controls the relay control circuit to work when any one of the electric quantity parameter, the input voltage signal, the temperature signal and the arc light signal exceeds a set threshold value or a remote control instruction is received, so as to control the running state of the photovoltaic inverter.

[0013] Further, the output electric quantity acquisition unit comprises:

[0014] The voltage transformer is used for acquiring the voltage signal output by the photovoltaic inverter.

[0015] The current transformer is used for acquiring the current signal output by the photovoltaic inverter.

[0016] The filter conversion circuit is connected with the voltage transformer and the current transformer respectively, and is used for converting the voltage signal and the current signal output by the photovoltaic inverter from current signal form to voltage signal form.

[0017] The metering chip is connected with the filter conversion circuit, so as to receive the voltage signal and the current signal output by the photovoltaic inverter in the form of voltage signal, and calculate the output power of the photovoltaic inverter according to the voltage signal and the current signal output by the photovoltaic inverter, and transmit the voltage signal, the current signal and the output power output by the photovoltaic inverter to the master controller.

[0018] Further, the temperature acquisition circuit comprises a PT100.

[0019] Further, the on-off quantity input circuit comprises a diode D4, a negative electrode of the diode D4 is connected with one end of a resistor R11, the other end of the resistor R11 is connected with a positive electrode of an input end of an optical coupler U5, a negative electrode of the input end of the optical coupler U5 is connected with the ground, and a positive electrode of an output end of the optical coupler U5 is connected with a positive electrode of a power supply, a negative electrode of the output end of the optical coupler U5 is connected with the master controller and one end of a resistor R12, the other end of the resistor R12 is connected with the ground.

[0020] Further, the relay control circuit comprises a resistor R13, one end of the resistor R13 is connected with the master controller, and the other end of the resistor R13 is connected with one end of a resistor R14 and a base of a triode Q1 respectively, the other end of the resistor R14 and an emitter of the triode Q1 are connected with the ground, a collector of the triode Q1 is connected with one end of a coil of a relay KA1, and the other end of the coil of the relay KA1 is connected with a positive electrode of the power supply.

[0021] Further, the power module is connected with the master controller to provide power voltage for the master controller.

[0022] Further, the man-machine interaction unit is connected with the master controller.

[0023] Beneficial effects: the utility model discloses a photovoltaic inverter output electric quantity parameter, input voltage signal, operating state signal, internal temperature signal and arc light signal are gathered, on one hand can detect and protect control photovoltaic inverter locally, still through communication module with the signal that gathers sends to cloud server, thereby can remote view photovoltaic inverter current state, and can according to need remote issue control instruction, and controller can according to remote control instruction control photovoltaic inverter's operating state, and then satisfy remote monitoring and control demand simultaneously. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 It is the principle block diagram of photovoltaic inverter detection terminal of the utility model embodiment;

[0025] Figure 2 It is the principle diagram of input voltage acquisition circuit of the utility model embodiment;

[0026] Figure 3 It is the principle diagram of switch quantity input circuit of the utility model embodiment;

[0027] Figure 4 It is the principle diagram of relay control circuit of the utility model embodiment. DETAILED DESCRIPTION

[0028] The utility model discloses further illustrate below in combination with the drawings and specific embodiment, and this embodiment is implemented under the premise of the utility model technical scheme, and should understand that these embodiments are only used for illustrating the utility model and are not used for limiting the scope of the utility model.

[0029] As Figures 1 to 4 The utility model embodiment provides a kind of photovoltaic inverter detection terminal, including output electric quantity acquisition unit 1, input voltage acquisition circuit 2, switch quantity input circuit 3, temperature acquisition circuit 4, arc light acquisition unit 5, master controller 6, communication module 7 and relay control circuit 8.

[0030] The output electric quantity acquisition unit 1 is used to acquire the electric quantity parameter output by the photovoltaic inverter. Specifically, the output electric quantity acquisition unit preferably comprises a voltage transformer 11, a current transformer 12, a filter conversion circuit 13 and a metering chip 14. The voltage transformer 11 is used to acquire the voltage signal output by the photovoltaic inverter. The current transformer 12 is used to acquire the current signal output by the photovoltaic inverter. The filter conversion circuit 13 is connected with the voltage transformer 11 and the current transformer 12 respectively. Since the signals output by the voltage transformer 11 and the current transformer 12 are in the form of current, the filter conversion circuit 13 is needed to convert the voltage signal output by the voltage transformer 11 and the current signal output by the current transformer 12 from the form of current to the form of voltage. The filter conversion circuit 13 is a prior art and will not be described in detail. The model of the metering chip 14 is preferably V9203. The metering chip 14 is connected with the filter conversion circuit 13 to receive the voltage signal and the current signal output by the photovoltaic inverter in the form of voltage signal, and to calculate the output power of the photovoltaic inverter according to the voltage signal and the current signal output by the photovoltaic inverter, and to send the voltage signal, the current signal and the output power output by the photovoltaic inverter to the main controller 6.

[0031] The input voltage acquisition circuit 2 is used to acquire the input voltage signal of the photovoltaic inverter. Specifically, refer to Figure 2 , wherein the resistors R1-R6 are used to convert the input voltage signal into a current signal. The operational amplifier U1 and its peripheral circuit constitute a current parallel negative feedback circuit. The optocoupler U4 can realize photoelectric isolation. The operational amplifier U2 and its peripheral circuit can convert the current signal into a voltage signal. The operational amplifier U3 and its peripheral circuit constitute an emitter follower, thereby improving the output load capacity.

[0032] The switch quantity input circuit 3 is used to acquire the running state signal of the photovoltaic inverter. The running state signal of the photovoltaic inverter includes running and stopping. Refer to Figure 3 , Figure 3 The circuit shown in the figure is one of the switch quantity inputs in the switch quantity input circuit 3. The actual switch quantity input circuit comprises several Figure 3 The circuit shown in the figure comprises a diode D4. The anode of the diode D4 is connected with the main switch or the contactor and other normally open / closed contacts for controlling the photovoltaic inverter. The cathode of the diode D4 is connected with one end of a resistor R11. The other end of the resistor R11 is connected with the input positive terminal of an optocoupler U5. The input negative terminal of the optocoupler U5 is connected with the ground. The output positive terminal of the optocoupler U5 is connected with the positive terminal of the power supply. The output negative terminal of the optocoupler U5 is connected with the main controller and one end of a resistor R12. The other end of the resistor R12 is connected with the ground. It is also preferred that a capacitor C8 is connected in parallel across the resistor R12.

[0033] The temperature acquisition circuit 4 comprises a PT100, which is used to acquire the temperature signal inside the photovoltaic inverter.

[0034] Arc light acquisition unit 5 includes several arc light probes for acquiring arc light signals within the photovoltaic inverter.

[0035] The main controller 6 preferably uses an STM32 series microcontroller, which is connected to the output power acquisition unit 1, the input voltage acquisition circuit 2, the switch input circuit 3, the temperature acquisition circuit 4, and the arc light acquisition unit 5 respectively. It receives the power parameters collected by the output power acquisition unit 1, the input voltage signal collected by the input voltage acquisition circuit 2, the operating status signal collected by the switch input circuit 3, the temperature signal collected by the temperature acquisition circuit 4, and the arc light signal collected by the arc light acquisition unit 5, and determines whether the received power parameters, input voltage signal, temperature signal, and arc light signal are within the set threshold range.

[0036] The communication module 7 can be a ROLA module or a 4G module. The communication module 7 is connected to the main controller 6 and is used to send power parameters, input voltage signals, operating status signals, temperature signals and arc light signals to the cloud server under the control of the main controller 6. It also receives remote control commands sent by the cloud server and sends the remote control commands to the main controller 6.

[0037] The relay control circuit 8 is connected to the main controller 6. The main controller 6 controls the relay control circuit to operate when any of the electrical parameters, input voltage signals, temperature signals, or arc flash signals exceed a set threshold, or when it receives a remote control command. This controls the operating status of the photovoltaic inverter, including controlling whether the photovoltaic inverter is started or stopped. For details, see [link to details]. Figure 4 , Figure 4 The diagram illustrates a portion of the relay control circuit; an actual relay control circuit comprises several... Figure 4 The circuit shown includes a resistor R13, one end of which is connected to the main controller, and the other end of which is connected to one end of a resistor R14 and the base of a transistor Q1. The other end of the resistor R14 and the emitter of the transistor Q1 are both connected to ground. The collector of the transistor Q1 is connected to one end of the coil of a relay KA1, and the other end of the coil of the relay KA1 is connected to the positive terminal of the power supply.

[0038] This embodiment of the utility model also includes a power module 9, which is connected to the main controller 6 to provide power voltage to the main controller 6.

[0039] This embodiment of the invention also includes a human-computer interaction unit 10, which is connected to the main controller 6. The human-computer interaction unit may include an LCD screen and multiple buttons, and can be used for parameter threshold setting and historical data querying, etc.

[0040] The above merely describes preferred embodiments of the present application, and it should be noted that other parts not specifically described are known in the art or common general knowledge to those skilled in the art. Without departing from the principles of the present application, several improvements and refinements can be made, and these improvements and refinements should also be considered within the scope of protection of the present application.

Claims

1. A photovoltaic inverter testing terminal, characterized in that, include: Output power acquisition unit, used to acquire power parameters output by photovoltaic inverter; Input voltage acquisition circuit, used to acquire the input voltage signal of photovoltaic inverter; A digital input circuit is used to acquire the operating status signal of the photovoltaic inverter; Temperature acquisition circuit, used to acquire temperature signals inside the photovoltaic inverter; Arc light acquisition unit, used to acquire arc light signals inside the photovoltaic inverter; The main controller is connected to the output power acquisition unit, the input voltage acquisition circuit, the switch input circuit, the temperature acquisition circuit, and the arc light acquisition unit, respectively, to receive the power parameters acquired by the output power acquisition unit, the input voltage signal acquired by the input voltage acquisition circuit, the operating status signal acquired by the switch input circuit, the temperature signal acquired by the temperature acquisition circuit, and the arc light signal acquired by the arc light acquisition unit, and to determine whether the received power parameters, input voltage signal, temperature signal, and arc light signal are within the set threshold range, respectively; The communication module is connected to the main controller and is used to send the power parameters, input voltage signal, operating status signal, temperature signal and arc light signal to the cloud server under the control of the main controller, and to receive remote control commands sent by the cloud server and send the remote control commands to the main controller. A relay control circuit is connected to the main controller. When any of the power parameters, input voltage signals, temperature signals, and arc signals exceed a set threshold or when a remote control command is received, the main controller controls the relay control circuit to operate, thereby controlling the operating status of the photovoltaic inverter.

2. The photovoltaic inverter testing terminal according to claim 1, characterized in that, The output power acquisition unit includes: Voltage transformers are used to collect the voltage signals output by photovoltaic inverters. Current transformers are used to collect the current signal output by photovoltaic inverters; A filtering and conversion circuit is connected to the voltage transformer and the current transformer respectively, and is used to convert the voltage signal and current signal output by the photovoltaic inverter from the current signal form to the voltage signal form. The metering chip is connected to the filtering and conversion circuit to receive the voltage and current signals output by the photovoltaic inverter in the form of voltage signals, calculate the output power of the photovoltaic inverter based on the voltage and current signals output by the photovoltaic inverter, and send the voltage, current and output power output by the photovoltaic inverter to the main controller.

3. A photovoltaic inverter testing terminal according to claim 1, characterized in that, The temperature acquisition circuit includes a PT100.

4. A photovoltaic inverter testing terminal according to claim 1, characterized in that, The digital input circuit includes a diode D4, the negative terminal of which is connected to one end of a resistor R11. The other end of the resistor R11 is connected to the positive input terminal of an optocoupler U5. The negative input terminal of the optocoupler U5 is connected to ground, and its positive output terminal is connected to the positive power supply terminal. The negative output terminal of the optocoupler U5 is connected to the main controller and one end of a resistor R12. The other end of the resistor R12 is connected to ground.

5. A photovoltaic inverter testing terminal according to claim 1, characterized in that, The relay control circuit includes a resistor R13. One end of the resistor R13 is connected to the main controller, and the other end is connected to one end of a resistor R14 and the base of a transistor Q1. The other end of the resistor R14 and the emitter of the transistor Q1 are both connected to ground. The collector of the transistor Q1 is connected to one end of the coil of a relay KA1, and the other end of the coil of the relay KA1 is connected to the positive terminal of the power supply.

6. A photovoltaic inverter testing terminal according to claim 1, characterized in that, It also includes a power module, which is connected to the main controller to provide power voltage to the main controller.

7. A photovoltaic inverter testing terminal according to claim 1, characterized in that, It also includes a human-computer interaction unit, which is connected to the main controller.

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