Photovoltaic optimizer calibration device and working method thereof

Abstract

The present invention discloses a photovoltaic optimizer calibration device and a working method thereof, belonging to the field of solar photovoltaic power generation technology. It includes a circuit board positioning jig, a pressure plate, a control and detection module, a communication module, an external DC photovoltaic simulation power supply, an external DC load and a voltage and current detection unit. The circuit board positioning jig and the pressure plate can accurately and reliably position the photovoltaic optimizer circuit board, quickly and batch calibrate the voltage, current and power accuracy of the photovoltaic optimizer, reduce the maximum power point tracking deviation, improve the efficiency of the photovoltaic optimizer, and whether the MPPT function is normal, which can significantly shorten the calibration time and improve production efficiency; by connecting to the host computer, the control of the calibration device and the analysis and comparison of the data can be quickly realized. Batch and accurate calibration of photovoltaic optimizers is achieved, labor costs are reduced, and quality assurance is provided for the normal use of photovoltaic components.

Description

Technical Field

[0001] The invention belongs to the technical field of solar photovoltaic power generation, and in particular relates to a photovoltaic optimizer calibration device and a working method thereof. Background Art

[0002] The photovoltaic optimizer can achieve maximum power point tracking (MPPT) for each photovoltaic component, ensuring that each photovoltaic module in the photovoltaic system can output the maximum amount of electrical energy. Since the precision of electronic components purchased by the photovoltaic optimizer in mass production has deviations, the program burned in is in the initial state. When used directly, the photovoltaic optimizer cannot obtain accurate voltage, current and power values. The maximum power point tracking power of the photovoltaic optimizer will have deviations, resulting in reduced efficiency; the photovoltaic optimizer cannot communicate accurate data externally. Summary of the invention

[0003] In order to solve the defects existing in the above-mentioned prior art, the purpose of the present invention is to provide a photovoltaic optimizer calibration device and a working method thereof, which can conveniently and quickly calibrate the photovoltaic optimizer with high accuracy and efficiency.

[0004] The present invention is achieved through the following technical solutions:

[0005] The present invention discloses a photovoltaic optimizer calibration device, including a circuit board positioning fixture, a pressing plate, a control and detection module, a communication module, an external DC photovoltaic simulation power supply, an external DC load and a voltage and current detection unit;

[0006] The pressure plate is provided with a plurality of contacts and interfaces connected to the control and detection module, and the wiring between the contacts and the positive and negative poles of the external DC photovoltaic simulation power supply, and the wiring between the contacts and the positive and negative poles of the external DC load are respectively connected to the voltage and current detection unit;

[0007] The communication module is arranged between the contact and the wiring of the positive and negative poles of the external DC load; the communication module, the external DC photovoltaic simulation power supply, the external DC load and the voltage and current detection unit are respectively connected to the control and detection module;

[0008] When in use, the circuit board positioning fixture fixes the photovoltaic optimizer circuit board on the pressure plate, the positive and negative poles of the input end and the positive and negative poles of the output end of the photovoltaic optimizer circuit board are respectively connected to the contacts on the pressure plate, and the initialization port of the photovoltaic optimizer circuit board is connected to the interface on the pressure plate; the control and detection module is connected to the host computer.

[0009] Preferably, the contacts on the pressure plate include a first circular contact, a second circular contact, a third circular contact, and a fourth circular contact, and the interface is a 10-pin pin interface; the voltage and current detection unit includes a first voltmeter, a first ammeter, a second voltmeter, and a second ammeter;

[0010] The first circular contact is connected to the negative pole of the external DC photovoltaic simulation power supply, the second circular contact is connected to the positive pole of the external DC photovoltaic simulation power supply, the first voltmeter is arranged between the first circular contact and the second circular contact, and the first ammeter is arranged between the second circular contact and the positive pole of the external DC photovoltaic simulation power supply; the third circular contact is connected to the positive pole of the external DC load, the fourth circular contact is connected to the negative pole of the external DC load, the second voltmeter is arranged between the third circular contact and the fourth circular contact, and the second ammeter is arranged between the third circular contact and the positive pole of the external DC load; the first voltmeter, the first ammeter, the second voltmeter and the second ammeter are respectively connected to the control and detection module.

[0011] Preferably, the circuit board positioning fixture includes a base, a wrench, a connecting mechanism and a clamping plate; the base is connected to the wrench, the wrench is connected to the clamping plate through the connecting mechanism, and a plurality of pressing pins are provided on the clamping plate.

[0012] Preferably, the control and detection module includes a single-chip microcomputer and a first interface, a second interface, a third interface and a fourth interface connected to the single-chip microcomputer; the first interface is connected to the interface on the pressure plate, the second interface is connected to the external DC photovoltaic simulation power supply, the third interface is connected to the external DC load, and the fourth interface is connected to the host computer; the single-chip microcomputer is connected to the communication module and the voltage and current detection unit.

[0013] Further preferably, the single chip microcomputer is a stm32F4xx built with a LABview development environment.

[0014] Preferably, the communication module matches the communication module on the photovoltaic optimizer circuit board.

[0015] The present invention discloses a working method of the photovoltaic optimizer calibration device, comprising:

[0016] Operate the circuit board positioning fixture to fix the photovoltaic optimizer circuit board on the pressing plate, connect the positive and negative poles of the input end and the positive and negative poles of the output end of the photovoltaic optimizer circuit board to the contacts on the pressing plate respectively, connect the initialization port of the photovoltaic optimizer circuit board to the interface on the pressing plate, and the host computer burns the firmware into the photovoltaic optimizer circuit board through the interface on the pressing plate;

[0017] The upper computer controls the external DC photovoltaic simulation power supply to a constant voltage mode and the external DC load to a no-load mode through the control and detection module; the control and detection module reads the input and output voltages of the photovoltaic optimizer circuit board measured by the voltage and current detection unit, and the control and detection module sets the first input and output voltage initial value of the photovoltaic optimizer circuit board through the interface on the pressure plate, so that it is consistent with the input and output voltage of the photovoltaic optimizer circuit board measured by the voltage and current detection unit. After setting, the external DC photovoltaic simulation power supply voltage value is changed, and the above steps are repeated to obtain the second input and output voltage initial value; the upper computer controls the external DC photovoltaic simulation power supply to a constant current mode and the external DC load to a constant voltage mode through the control and detection module; the control and detection module reads the input and output voltages of the photovoltaic optimizer circuit board measured by the voltage and current detection unit. The control and detection module sets the first input and output current initial value of the photovoltaic optimizer circuit board through the interface on the pressure plate, so that it is consistent with the input and output current of the photovoltaic optimizer circuit board measured by the voltage and current detection unit, and changes the external DC photovoltaic simulation power supply current value after setting, and repeats the above steps to obtain the second input and output current initial value; by comparing the first input and output voltage initial value, the first input and output current initial value, the second input and output voltage initial value and the second input and output current initial value of the photovoltaic optimizer circuit board read from the communication module by the control and detection module, and the first input and output voltage initial value, the first input and output current initial value, the second input and output voltage initial value and the second input and output current initial value read from the interface on the pressure plate, it is determined whether the communication function of the photovoltaic optimizer circuit board is normal;

[0018] The control and detection module reads the IV curve of a pre-stored photovoltaic component from the host computer. The control and detection module controls the external DC photovoltaic simulation power supply to change the voltage and current within a preset time according to the IV curve, thereby changing the input and output voltage and current values ​​of the photovoltaic optimizer circuit board; the control and detection module controls the external DC load to a constant voltage mode. The control and detection module obtains a power value according to the voltage and current values ​​of the IV curve, and compares it with the input and output power of the photovoltaic optimizer circuit board obtained from the voltage and current detection unit to determine whether the maximum power tracking efficiency value and the electrical efficiency value are accurate.

[0019] Compared with the prior art, the present invention has the following beneficial technical effects:

[0020] The present invention discloses a photovoltaic optimizer calibration device, which can accurately and reliably position the photovoltaic optimizer circuit board through the circuit board positioning fixture and the pressure plate, and can conveniently and quickly complete the calibration of various functions of the photovoltaic optimizer through the control and detection module, the communication module, the external DC photovoltaic simulation power supply, the external DC load and the voltage and current detection unit; by connecting to the host computer, the control of the calibration device and the analysis and comparison of the data can be quickly realized. The photovoltaic optimizer can be accurately and accurately calibrated in batches, the labor cost is reduced, and the quality assurance is provided for the normal use of photovoltaic components.

[0021] The working method of the photovoltaic optimizer verification device disclosed in the present invention can quickly and batch-verify the voltage, current and power accuracy of the photovoltaic optimizer, reduce the maximum power point tracking deviation, improve the efficiency of the photovoltaic optimizer, and whether the MPPT function is normal, which can significantly shorten the verification time and improve production efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the overall structure of the photovoltaic optimizer verification device of the present invention;

[0023] Figure 2 is a schematic top view of a pressing plate of the present invention;

[0024] Figure 3 It is a connection principle diagram of the control and detection module of the present invention.

[0025] In the figure: 1-circuit board positioning fixture, 11-base, 12-wrench, 13-connecting mechanism, 14-pressing plate, 15-pressing pin; 2-pressing plate, 21-first circular contact, 22-second circular contact, 23-third circular contact, 24-fourth circular contact, 25-10pin pin interface; 3-control and detection module, 31-first interface, 32-second interface, 33-third interface, 34-fourth interface, 35-single chip microcomputer; 4-communication module; 5-external DC photovoltaic simulation power supply, 51-external DC photovoltaic simulation power supply negative pole, 52-external DC photovoltaic simulation power supply positive pole; 6-external DC load, 61-external DC load positive pole, 62-external DC load negative pole; 7-voltage and current detection unit, 71-first voltmeter, 72-first ammeter, 73-second voltmeter, 74-second ammeter. DETAILED DESCRIPTION

[0026] The present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments, the contents of which are intended to explain the present invention rather than to limit it:

[0027] like Figure 1The photovoltaic optimizer calibration device of the present invention comprises a circuit board positioning fixture 1, a pressing plate 2, a control and detection module 3, a communication module 4, an external DC photovoltaic simulation power supply 5, an external DC load 6 and a voltage and current detection unit 7; the circuit board positioning fixture 1 comprises a base 11, a wrench 12, a connecting mechanism 13 and a clamping plate 14; the base 11 is connected to the wrench 12, the wrench 12 is connected to the clamping plate 14 through the connecting mechanism 13, and a plurality of pressing pins 15 are provided on the clamping plate 14. The control and detection module 3, the communication module 4, the external DC photovoltaic simulation power supply 5, the external DC load 6 and the voltage and current detection unit 7 can be arranged inside the base 11.

[0028] like Figure 2 The contacts on the pressure plate 2 include a first circular contact 21, a second circular contact 22, a third circular contact 23, and a fourth circular contact 24, and the interface is a 10-pin pin interface 25; the voltage and current detection unit 7 includes a first voltmeter 71, a first ammeter 72, a second voltmeter 73, and a second ammeter 74; the first circular contact 21 is connected to the negative pole 51 of the external DC photovoltaic simulation power supply, the second circular contact 22 is connected to the positive pole 52 of the external DC photovoltaic simulation power supply, and the first voltmeter 71 is arranged between the first circular contact 21 and The first ammeter 72 is arranged between the second circular contact 22 and the positive pole 52 of the external DC photovoltaic simulation power supply; the third circular contact 23 is connected to the positive pole 61 of the external DC load, the fourth circular contact 24 is connected to the negative pole 62 of the external DC load, and the communication module 4 is arranged between the contact and the connection between the positive and negative poles of the external DC load 6; the second voltmeter 73 is arranged between the third circular contact 23 and the fourth circular contact 24, and the second ammeter 74 is arranged between the third circular contact 23 and the positive pole 61 of the external DC load.

[0029] The communication module 4 matches the communication module on the photovoltaic optimizer circuit board. When the communication module on the photovoltaic optimizer circuit board adopts the currently commonly used PLC communication module, the communication module 4 is also a PLC communication module, which mainly includes a carrier transformer, a carrier generator and a development device, and has the functions of sending and receiving. The single-chip microcomputer 35 sends information through the serial port, and the signal is combined with the baseband signal generated by the carrier generator in the communication module 4, and after power amplification, a high-frequency signal is generated on the power line through the carrier transformer and transmitted to the PLC communication module on the photovoltaic optimizer circuit board.

[0030] like Figure 3The control and detection module 3 includes a single-chip microcomputer 35 and a first interface 31, a second interface 32, a third interface 33 and a fourth interface 34 connected to the single-chip microcomputer 35, wherein the second interface 32, the third interface 33 and the fourth interface 34 are com ports; the first interface 31 is connected to the interface on the pressing plate 2, the second interface 32 is connected to the external DC photovoltaic simulation power supply 5, the third interface 33 is connected to the external DC load 6, and the fourth interface 34 is connected to the host computer. The single-chip microcomputer 35 is connected to the communication module 4, the first voltmeter 71, the first ammeter 72, the second voltmeter 73 and the second ammeter 74. The single-chip microcomputer 35 can adopt the stm32F4xx with the LABview development environment.

[0031] When in use, the circuit board positioning fixture 1 places the back of the photovoltaic optimizer circuit board close to the pressure plate 2, the positive and negative poles of the input end and the positive and negative poles of the output end of the photovoltaic optimizer circuit board are respectively connected to the first circular contact 21, the second circular contact 22, the third circular contact 23 and the fourth circular contact 24, and the initialization port of the photovoltaic optimizer circuit board is connected to the 10-pin pin interface 25.

[0032] When the above photovoltaic optimizer verification device is working:

[0033] Operate the circuit board positioning fixture 1 to fix the photovoltaic optimizer circuit board on the pressing plate 2. The positive and negative poles of the input end and the positive and negative poles of the output end of the photovoltaic optimizer circuit board are respectively connected to the contacts on the pressing plate 2. The initialization port of the photovoltaic optimizer circuit board is connected to the interface on the pressing plate 2. The upper computer burns the firmware into the photovoltaic optimizer circuit board through the interface on the pressing plate 2.

[0034] The upper computer controls the external DC photovoltaic simulation power supply 5 to a constant voltage mode and the external DC load 6 to a no-load mode through the control and detection module 3; the control and detection module 3 reads the input and output voltages of the photovoltaic optimizer circuit board measured by the voltage and current detection unit 7, and the control and detection module 3 sets the first input and output voltage initial value of the photovoltaic optimizer circuit board through the interface on the pressure plate 2, so that it is consistent with the input and output voltage of the photovoltaic optimizer circuit board measured by the voltage and current detection unit 7, and after setting, changes the voltage value of the external DC photovoltaic simulation power supply 5, and repeats the above steps to obtain the second input and output voltage initial value; the upper computer controls the external DC photovoltaic simulation power supply 5 to a constant current mode and the external DC load 6 to a constant voltage mode through the control and detection module 3; the control and detection module 3 reads the input and output currents of the photovoltaic optimizer circuit board measured by the voltage and current detection unit 7, and the control and detection module 3 The first input and output current initial value of the photovoltaic optimizer circuit board is set through the interface on the pressure plate 2 to make it consistent with the input and output current of the photovoltaic optimizer circuit board measured by the voltage and current detection unit 7. After setting, the current value of the external DC photovoltaic simulation power supply 5 is changed, and the above steps are repeated to obtain the second input and output current initial value; by comparing the first input and output voltage initial value, the first input and output current initial value, the second input and output voltage initial value and the second input and output current initial value of the photovoltaic optimizer circuit board read from the communication module 4 by the control and detection module 3, and the first input and output voltage initial value, the first input and output current initial value, the second input and output voltage initial value and the second input and output current initial value read from the interface on the pressure plate 2, it is determined whether the communication function of the photovoltaic optimizer circuit board is normal; since the voltage and current are both linearly related, two sets of data are tested for both the voltage and current.

[0035] The control and detection module 3 reads the IV curve of a pre-stored photovoltaic module from the host computer, and the control and detection module 3 controls the external DC photovoltaic simulation power supply 5 to change the voltage and current within a period of time according to the IV curve, thereby changing the input and output voltage and current values ​​of the photovoltaic optimizer circuit board; the control and detection module 3 controls the external DC load 6 to be in constant voltage mode, and the control and detection module 3 obtains the power value according to the voltage and current values ​​of the IV curve, and compares it with the input and output power of the photovoltaic optimizer circuit board obtained from the voltage and current detection unit 7 to determine whether the maximum power tracking efficiency value and the electrical efficiency value are accurate. In order to improve the accuracy of the verification, the low load IV curve and the high load IV curve can be used to determine whether the maximum power tracking efficiency value and the electrical efficiency value are accurate.

[0036] It should be noted that the above is only a part of the implementation of the present invention, and equivalent changes made to the system described in the present invention are all included in the protection scope of the present invention. Those skilled in the art of the present invention can replace the specific examples described in a similar manner, as long as they do not deviate from the structure of the present invention or exceed the scope defined by the claims, they all belong to the protection scope of the present invention.

Claims

1. A photovoltaic optimizer calibration device, characterized in that: It comprises a circuit board positioning fixture (1), a pressing plate (2), a control and detection module (3), a communication module (4), an external DC photovoltaic simulation power supply (5), an external DC load (6) and a voltage and current detection unit (7); The pressure plate (2) is provided with a plurality of contacts and interfaces connected to the control and detection module (3); the wiring between the contacts and the positive and negative poles of the external DC photovoltaic simulation power supply (5) and the wiring between the contacts and the positive and negative poles of the external DC load (6) are respectively connected to the voltage and current detection unit (7); The communication module (4) is disposed between the contact and the positive and negative poles of the external DC load (6); the communication module (4), the external DC photovoltaic simulation power supply (5), the external DC load (6) and the voltage and current detection unit (7) are respectively connected to the control and detection module (3); When in use, the circuit board positioning fixture (1) fixes the photovoltaic optimizer circuit board on the pressing plate (2); the positive and negative poles of the input end and the positive and negative poles of the output end of the photovoltaic optimizer circuit board are respectively connected to the contacts on the pressing plate (2); the initialization port of the photovoltaic optimizer circuit board is connected to the interface on the pressing plate (2); the control and detection module (3) is connected to the host computer; The contacts on the pressure plate (2) include a first circular contact (21), a second circular contact (22), a third circular contact (23), and a fourth circular contact (24); the interface is a 10-pin interface (25); the voltage and current detection unit (7) includes a first voltmeter (71), a first ammeter (72), a second voltmeter (73), and a second ammeter (74); The first circular contact (21) is connected to the negative pole (51) of the external DC photovoltaic simulation power supply, the second circular contact (22) is connected to the positive pole (52) of the external DC photovoltaic simulation power supply, the first voltmeter (71) is arranged between the first circular contact (21) and the second circular contact (22), and the first ammeter (72) is arranged between the second circular contact (22) and the positive pole (52) of the external DC photovoltaic simulation power supply; the third circular contact (23) is connected to the positive pole (61) of the external DC load, the fourth circular contact (24) is connected to the negative pole (62) of the external DC load, the second voltmeter (73) is arranged between the third circular contact (23) and the fourth circular contact (24), and the second ammeter (74) is arranged between the third circular contact (23) and the positive pole (61) of the external DC load; the first voltmeter (71), the first ammeter (72), the second voltmeter (73) and the second ammeter (74) are respectively connected to the control and detection module (3); The circuit board positioning fixture (1) comprises a base (11), a wrench (12), a connecting mechanism (13) and a pressing plate (14); the base (11) is connected to the wrench (12), the wrench (12) is connected to the pressing plate (14) via the connecting mechanism (13), and a plurality of pressing pins (15) are provided on the pressing plate (14).

2. The photovoltaic optimizer calibration device according to claim 1, characterized in that: The control and detection module (3) comprises a single-chip microcomputer (35) and a first interface (31), a second interface (32), a third interface (33), and a fourth interface (34) connected to the single-chip microcomputer (35); the first interface (31) is connected to an interface on the pressing plate (2), the second interface (32) is connected to an external DC photovoltaic simulation power supply (5), the third interface (33) is connected to an external DC load (6), and the fourth interface (34) is connected to a host computer; the single-chip microcomputer (35) is connected to the communication module (4) and the voltage and current detection unit (7).

3. The photovoltaic optimizer calibration device according to claim 2, characterized in that: The single chip microcomputer (35) is a stm32F4xx with LABview development environment.

4. The photovoltaic optimizer calibration device according to claim 1, characterized in that: The communication module (4) matches the communication module on the photovoltaic optimizer circuit board.

5. The working method of the photovoltaic optimizer verification device according to any one of claims 1 to 4, characterized in that: include: The circuit board positioning jig (1) is operated to fix the photovoltaic optimizer circuit board on the pressing plate (2); the positive and negative poles of the input end and the positive and negative poles of the output end of the photovoltaic optimizer circuit board are respectively connected to the contacts on the pressing plate (2); the initialization port of the photovoltaic optimizer circuit board is connected to the interface on the pressing plate (2); and the upper computer burns the firmware into the photovoltaic optimizer circuit board through the interface on the pressing plate (2); The upper computer controls the external DC photovoltaic simulation power supply (5) to a constant voltage mode and controls the external DC load (6) to a no-load mode through the control and detection module (3); the control and detection module (3) reads the input and output voltages of the photovoltaic optimizer circuit board measured by the voltage and current detection unit (7); the control and detection module (3) sets the first input and output voltage initial value of the photovoltaic optimizer circuit board through the interface on the pressure plate (2) so that it is consistent with the input and output voltage of the photovoltaic optimizer circuit board measured by the voltage and current detection unit (7); after setting, the voltage value of the external DC photovoltaic simulation power supply (5) is changed, and the above steps are repeated to obtain the second input and output voltage initial value; The upper computer controls the external DC photovoltaic simulation power supply (5) to a constant current mode and controls the external DC load (6) to a constant voltage mode through the control and detection module (3); the control and detection module (3) reads the input and output current of the photovoltaic optimizer circuit board measured by the voltage and current detection unit (7); the control and detection module (3) sets the first input and output current initial value of the photovoltaic optimizer circuit board through the interface on the pressure plate (2) so that it is consistent with the input and output current of the photovoltaic optimizer circuit board measured by the voltage and current detection unit (7); after setting, the current value of the external DC photovoltaic simulation power supply (5) is changed, and the above steps are repeated to obtain the second input and output current initial value; By comparing the first input-output voltage initial value, the first input-output current initial value, the second input-output voltage initial value, and the second input-output current initial value of the photovoltaic optimizer circuit board read by the control and detection module (3) from the communication module (4), and the first input-output voltage initial value, the first input-output current initial value, the second input-output voltage initial value, and the second input-output current initial value read from the interface on the pressure plate (2), it is determined whether the communication function of the photovoltaic optimizer circuit board is normal; The control and detection module (3) reads a pre-stored IV curve of a photovoltaic module from a host computer, and the control and detection module (3) controls an external DC photovoltaic simulation power supply (5) to change voltage and current within a preset time according to the IV curve, thereby changing the input and output voltage and current values ​​of the photovoltaic optimizer circuit board; the control and detection module (3) controls the external DC load (6) to a constant voltage mode, and the control and detection module (3) obtains a power value according to the voltage and current values ​​of the IV curve, and compares it with the input and output power of the photovoltaic optimizer circuit board obtained from the voltage and current detection unit (7), so as to determine whether the maximum power tracking efficiency value and the electrical efficiency value are accurate.

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