Photovoltaic power measuring equipment

Abstract

The invention belongs to the technical field of photovoltaic measurement, and particularly relates to photovoltaic power measurement equipment which comprises a variable load circuit, a current acquisition circuit and a voltage acquisition circuit. The dip angle measuring device comprises a dip angle measuring module used for generating magnetic parameters and space parameters, and the processing device is used for generating dip angle parameters according to the magnetic parameters and the space parameters; the battery measuring device comprises a battery electric quantity detection circuit which is used for collecting a battery voltage signal of the photovoltaic module to be measured and outputting the battery voltage signal to the processing device. On the basis of having a photovoltaic module power measurement function, the equipment integrates a photovoltaic module inclination angle measurement function and a battery measurement function, the application range of the equipment is obviously expanded, and convenience is provided for installation of the photovoltaic module, so that various test requirements can be met, and the measurement functions are comprehensive.

Description

Technical Field

[0001] The present application relates to the technical field of photovoltaic component measurement, and in particular to a photovoltaic power measurement device. Background Art

[0002] Photovoltaic power measurement equipment evaluates key parameters such as cell conversion efficiency and power output by measuring the current-voltage characteristic curve of photovoltaic cells under different light and temperature conditions. In related technologies, existing photovoltaic power measurement equipment has relatively single functions and can only test basic power parameters of photovoltaic panels, such as voltage and current. In particular, during the installation and testing of photovoltaic panels, it is crucial to determine and record the optimal light angle, but existing products lack the tilt angle test function.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] In view of at least one of the above technical problems, the present application provides a photovoltaic power measurement device.

[0005] The present application provides a photovoltaic power measurement device, including: a power measurement device, a tilt angle measurement device, a battery measurement device and a processing device;

[0006] The power measurement device includes: a variable load circuit, a current acquisition circuit and a voltage acquisition circuit, wherein the variable load circuit is used to change its own load to adjust the current in the photovoltaic module to be tested, the current acquisition circuit is used to collect the current signal in the photovoltaic module to be tested, the voltage acquisition circuit is used to collect the voltage signal in the photovoltaic module to be tested, and the processing device is used to obtain the circuit parameters of the photovoltaic module according to the current signal and the voltage signal;

[0007] The inclination measuring device comprises: an inclination measuring module, the inclination measuring module is used to generate magnetic parameters and spatial parameters, and the processing device is used to generate the inclination parameters according to the magnetic parameters and the spatial parameters;

[0008] The battery measuring device comprises: a battery power detection circuit, which is used to collect the battery voltage signal of the photovoltaic component to be tested and output it to the processing device.

[0009] One of the above technical solutions has at least one of the following advantages or beneficial effects: on the basis of the photovoltaic module power measurement function, the device integrates the inclination measurement function of the photovoltaic module and the battery measurement function, which significantly expands the application scope of the equipment and facilitates the installation of photovoltaic modules, thereby being able to meet various testing needs and having comprehensive measurement functions.

[0010] In some possible implementations, the variable load circuit includes: a PWM control circuit and a variable load controlled circuit, the PWM control circuit is connected to the variable load controlled circuit, the PWM control circuit is used to provide a PWM signal to the variable load controlled circuit, the variable load controlled circuit is connected to the photovoltaic component to be tested, and the variable load controlled circuit is used to adjust the load according to the PWM signal, thereby adjusting the current in the photovoltaic component to be tested.

[0011] In some possible implementations, the variable load controlled circuit includes: a first adjustment unit, a first variable resistance unit, a second adjustment unit, a second variable resistance unit, a third adjustment unit and a third variable resistance unit, the positive phase input ends of the first adjustment unit, the second adjustment unit and the third adjustment unit are all connected to the PWM control circuit, the first end of the first variable resistance unit is connected to the first adjustment unit, the second end of the first variable resistance unit is connected to the photovoltaic component to be tested, the first end of the second variable resistance unit is connected to the second adjustment unit, the second end of the second variable resistance unit is connected to the photovoltaic component to be tested, the first end of the third variable resistance unit is connected to the third adjustment unit, the second end of the third variable resistance unit is connected to the photovoltaic component to be tested, and the third ends of the first variable resistance unit, the second variable resistance unit and the third variable resistance unit are connected in common.

[0012] In some possible implementations, the first variable resistance unit, the second variable resistance unit, and the third variable resistance unit are all MOS tubes.

[0013] In some possible implementations, the first regulating unit, the second regulating unit, and the third regulating unit are all operational amplifiers.

[0014] In some possible implementations, the tilt angle measurement module is a chip integrating a magnetometer and an accelerometer.

[0015] In some possible implementations, the tilt angle measurement module is communicatively connected to the processing device via IIC.

[0016] In some possible implementations, the battery power detection circuit includes: an analog switch and a battery gear circuit, the battery gear circuit is connected between the photovoltaic component to be tested and the processing device, and the analog switch is controlled by the processing device and selectively connected to a branch of the battery gear circuit.

[0017] In some possible implementations, the battery gear circuit includes a first gear branch, a second gear branch, and a third gear branch.

[0018] In some possible implementations, the analog switch has a first control terminal and a second control terminal respectively connected to the processing device;

[0019] When the first control terminal is at a low level and the second control terminal is at a high level, the analog switch is connected to the first gear branch;

[0020] When the first control terminal is at a high level and the second control terminal is at a low level, the analog switch is connected to the second gear branch;

[0021] When the first control terminal is at a high level and the second control terminal is at a high level, the analog switch is connected to the third gear branch.

[0022] The present application is further described below in conjunction with the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic diagram of a photovoltaic power measurement device provided in an embodiment of the present application;

[0025] Figure 2 A schematic diagram of a power measurement device provided in an embodiment of the present application;

[0026] Figure 3 A schematic diagram of a variable load circuit provided in an embodiment of the present application;

[0027] Figure 4 A circuit diagram of a variable load circuit provided in an embodiment of the present application;

[0028] Figure 5 A circuit diagram of a battery power detection circuit provided in an embodiment of the present application; DETAILED DESCRIPTION

[0029] In order to make the above-mentioned purposes, features and advantages of the present application more obvious and easy to understand, the specific embodiments of the present application are described in detail below in conjunction with the accompanying drawings. In the following description, many specific details are set forth to facilitate a full understanding of the present application. However, the present application can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without violating the connotation of the present application, so the present application is not limited by the specific embodiments disclosed below.

[0030] like Figures 1 to 5As shown, this embodiment provides a photovoltaic power measurement device, including: a power measurement device 100, a tilt measurement device 200, a battery power measurement device 300 and a processing device. Based on the photovoltaic module power measurement function, this device integrates the tilt measurement function of the photovoltaic module and the battery measurement function, which significantly expands the application range of the device and provides convenience for the installation of photovoltaic modules, so as to meet various testing needs and have comprehensive measurement functions. In addition, this device has a convenient tilt measurement function, which is convenient for finding and recording the tilt corresponding to the maximum power; at the same time, the dedicated battery measurement function can identify the power of batteries of different properties; photovoltaic power measurement, fast and convenient measurement of the maximum power of photovoltaic panels.

[0031] It is understood that a photovoltaic component is a photovoltaic solar device, which includes but is not limited to photovoltaic panels and photovoltaic cells.

[0032] The photovoltaic power measurement device in this embodiment is introduced below.

[0033] like Figures 1 to 5 As shown, the power measurement device 100 includes: a variable load circuit 110, a current acquisition circuit 120 and a voltage acquisition circuit 130. The variable load circuit 110 is used to change its own load to adjust the current in the photovoltaic component to be tested, the current acquisition circuit 120 is used to collect the current signal in the photovoltaic component to be tested, and the voltage acquisition circuit 130 is used to collect the voltage signal in the photovoltaic component to be tested. The processing device is used to obtain the circuit parameters of the photovoltaic component according to the current signal and the voltage signal.

[0034] In practical applications, the variable load circuit 110 is connected to the photovoltaic module to achieve the effect of changing the current in the photovoltaic module to be tested. The current signal in the photovoltaic module to be tested is collected through the current acquisition circuit 120. The voltage signal in the photovoltaic module to be tested is collected through the voltage acquisition circuit 130. The processing device receives the current signal and the voltage signal and calculates the circuit parameters of the photovoltaic module.

[0035] It is understandable that the photovoltaic module circuit parameters include but are not limited to the open circuit voltage, short circuit voltage, and maximum power point of the photovoltaic cell.

[0036] The inclination measuring device 200 comprises: an inclination measuring module, the inclination measuring module is used to generate magnetic parameters and spatial parameters, and a processing device is used to generate inclination parameters according to the magnetic parameters and spatial parameters.

[0037] The inclination measurement module is a chip that integrates a magnetometer and an accelerometer. The magnetometer is responsible for measuring magnetic field data, and determines the heading angle, that is, the angle between the current direction and the magnetic north, by measuring the horizontal component of the geomagnetic field. In the northern hemisphere, the geomagnetic field is tilted toward the ground, and the X-axis and Y-axis data of the magnetometer can be used to calculate the heading angle. When the device rotates horizontally, the heading angle varies between 0°-360°. The accelerometer is used to measure the inclination angle.

[0038] The inclination measurement module is connected to the processing device through IIC. The gravity distribution and magnetic field data in the three-dimensional space are transmitted to the processing device through IIC through the signal processing and ADC data acquisition part. The processing device generates inclination parameters based on magnetic parameters and spatial parameters, wherein the magnetic parameters are collected by the magnetometer and the spatial parameters are collected by the accelerometer.

[0039] In actual use, first place the photovoltaic power measurement device horizontally and perform angle calibration to ensure the accuracy of the measurement. After the calibration is completed, when the maximum power point of the photovoltaic panel is measured, just place the photovoltaic power measurement device parallel to the photovoltaic panel to read and record the optimal tilt angle of the photovoltaic panel on the LCD screen. This process simplifies the operation steps and improves the convenience and accuracy of the measurement.

[0040] In addition, the tilt measurement module may encounter a variety of errors during measurement, including sensitivity error, zero offset, nonlinear error, and temperature-induced error. In order to improve the accuracy of the measurement, the following calibration measures can be taken: First, the photovoltaic power measurement device is placed on a surface of known level, and the zero point of the tilt measurement module is adjusted to eliminate the zero offset error. Secondly, by calibrating the photovoltaic power measurement device at different temperatures and establishing a temperature compensation model, the impact of temperature changes on the measurement results can be reduced. In addition, the output data of the tilt measurement device 200 is linearized using a software algorithm, which helps to reduce nonlinear errors.

[0041] The battery capacity measuring device 300 comprises: a battery capacity detection circuit, which is used to collect the battery voltage signal of the photovoltaic component to be tested and output it to the processing device.

[0042] In actual applications, the battery power detection circuit collects the battery voltage signal of the photovoltaic module to be tested, outputs it to the processing device, and then displays it on the LCD screen. When the power is sufficient, the LCD screen displays "GOOD", when the power is low, it displays "LOW", and when the power is exhausted, it displays "BAD". When the power is displayed as "BAD", it means that the battery is no longer usable.

[0043] like Figures 1 to 5As shown, in some embodiments, the variable load circuit 110 includes: a PWM control circuit 111 and a variable load controlled circuit 112, the PWM control circuit 111 is connected to the variable load controlled circuit 112, the PWM control circuit 111 is used to provide a PWM signal to the variable load controlled circuit 112, the variable load controlled circuit 112 is connected to the photovoltaic component to be tested, and the variable load controlled circuit 112 is used to adjust the load according to the PWM signal, thereby adjusting the current in the photovoltaic component to be tested.

[0044] First, the load of the variable load controlled circuit 112 is adjusted by a PWM signal, thereby adjusting the current in the photovoltaic module to be tested. The PWM control method can achieve high-precision current regulation, because the duty cycle of the PWM signal can be accurately controlled, and the change of the duty cycle can linearly change the equivalent resistance of the load, thereby finely adjusting the current in the photovoltaic module. For example, when performing a maximum power point tracking (MPPT) test on a photovoltaic module, accurately adjusting the current helps to quickly and accurately find the maximum power output point of the photovoltaic module. In addition, the resolution of PWM control is higher, and PWM control can achieve continuous current regulation in a wide range, which is very beneficial for studying the performance characteristics of photovoltaic modules under different operating currents.

[0045] Secondly, due to the flexibility of PWM signal control, the variable load controlled circuit 112 can quickly respond to the control signal and efficiently adjust the load, which enables the entire test circuit to complete the test of the performance of the photovoltaic module under different load conditions in a shorter time, thereby improving the test efficiency.

[0046] Again, the use of PWM regulation can prevent the photovoltaic module from being damaged due to abnormal conditions such as overcurrent during the test process. The PWM control circuit can accurately control the rise and fall speed of the current according to the preset parameters. For example, when it is found that the current has a tendency to exceed the safe range, the load current can be reduced by quickly adjusting the duty cycle of the PWM signal to protect the photovoltaic module. The variable load controlled circuit 112 is connected to the photovoltaic module to be tested. This connection method allows the load regulation process to be closely coordinated with the photovoltaic module. When testing the short-circuit current and other limit parameters of the photovoltaic module, the load can be approached to a short-circuit state by gradually changing the PWM signal, rather than directly short-circuiting, thereby reducing the impact on the photovoltaic module and extending the service life of the photovoltaic module.

[0047] like Figures 1 to 5As shown, in some embodiments, the variable load controlled circuit 112 includes: a first adjustment unit U1-C, a first variable resistance unit Q1, a second adjustment unit U1-B, a second variable resistance unit Q4, a third adjustment unit U1-A and a third variable resistance unit Q6, the positive phase input ends of the first adjustment unit U1-C, the second adjustment unit U1-B and the third adjustment unit U1-A are all connected to the PWM control circuit 111, the first end of the first variable resistance unit Q1 is connected to the first adjustment unit U1-C, the second end of the first variable resistance unit Q1 is connected to the photovoltaic component to be tested, the first end of the second variable resistance unit Q4 is connected to the second adjustment unit U1-B, the second end of the second variable resistance unit Q4 is connected to the photovoltaic component to be tested, the first end of the third variable resistance unit Q6 is connected to the third adjustment unit U1-A, the second end of the third variable resistance unit Q6 is connected to the photovoltaic component to be tested, and the third ends of the first variable resistance unit Q1, the second variable resistance unit Q4 and the third variable resistance unit Q6 are connected in common.

[0048] Specifically, the first variable resistance unit Q1 , the second variable resistance unit Q4 , and the third variable resistance unit Q6 are all MOS tubes.

[0049] Specifically, the first regulating unit U1 -C, the second regulating unit U1 -B, and the third regulating unit U1 -A are all operational amplifiers.

[0050] The first adjustment unit U1-C controls the first variable resistance unit Q1, the second adjustment unit U1-B controls the second variable resistance unit Q4, and the third adjustment unit U1-A controls the third variable resistance unit Q6. Since the control methods of the first adjustment unit U1-C, the second adjustment unit U1-B, and the third adjustment unit U1-A are the same, the first adjustment unit U1-C controlling the first variable resistance unit Q1 is taken as an example for introduction.

[0051] In actual applications, the first adjustment unit U1-C receives and amplifies the PWM signal, and then outputs it to the first variable resistance unit Q1. The gate-source voltage of the first variable resistance unit Q1 changes, so that the first variable resistance unit Q1 is in the variable resistance area and has a certain drain-source resistance.

[0052] Exemplarily, when the duty cycle of the PWM signal increases, the output voltage of the first adjustment unit U1-C increases, and the gate-source voltage of the first variable resistance unit Q1 increases. As the gate-source voltage of the first variable resistance unit Q1 increases, the drain-source resistance of the first variable resistance unit Q1 decreases, which means that the current passing through the first variable resistance unit Q1 increases, thereby changing the voltage of the load connected to the first variable resistance unit Q1.

[0053] like Figures 1 to 5As shown, in some embodiments, the battery power detection circuit 300 includes: an analog switch U15 and a battery gear circuit 310, the battery gear circuit is connected between the photovoltaic component to be tested and the processing device, and the analog switch U15 is controlled by the processing device and selectively connected to a branch of the battery gear circuit. Through the control of the processing device, the gear switching is completed to achieve different voltage range measurements.

[0054] like Figures 1 to 5 As shown, in some embodiments, the battery gear circuit includes a first gear branch 311, a second gear branch 312 and a third gear branch.

[0055] The first gear branch 311 is used to measure the 1.5V battery gear. The first gear branch 311 has a first load resistor R61, and the resistance of the first load resistor R61 is 30Ω. When the analog switch U15 is connected to the first gear branch 311, if the battery voltage reaches or exceeds 1.31V, the LCD screen will display "GOOD", indicating that the battery power is in the best state. When the battery voltage is between 1.3V and 0.95V, the LCD screen will display "LOW", which means that the battery power is low. If the battery voltage drops to 0.94V or below, the LCD screen will display "BAD", indicating that the battery can no longer be used.

[0056] The second gear branch 312 is used to measure the 9V battery gear. The second gear branch 312 has a second load resistor R60, and the resistance of the second load resistor R60 is 900Ω. When the measured battery voltage is ≥7.8V, the LCD displays GOOD, indicating that the battery power is in the best state. When the battery voltage is in the middle value of 7.7V to 5.7V, the LCD displays "LOW", indicating that the battery power is in a low power state; if the measured battery voltage drops to ≤5.6V, the LCD displays BAD, indicating that the battery can no longer be used.

[0057] The third gear branch 313 is used to measure the 12V battery gear. The third gear branch 313 has a third load resistor R63, and the resistance of the third load resistor R63 is 240Ω. When the measured battery voltage is ≥10.5V, the LCD displays GOOD, indicating that the battery power is in the best state. When the battery voltage is in the middle value of 10.4V to 7.6V, the LCD displays "LOW", indicating that the battery power is in a low power state. If the measured battery voltage drops to ≤7.5V, the LCD displays BAD, indicating that the battery can no longer be used.

[0058] like Figures 1 to 5As shown, in some embodiments, the analog switch U15 has a first control end and a second control end respectively connected to the processing device; when the first control end is at a low level and the second control end is at a high level, the analog switch U15 is connected to the first gear branch 311; when the first control end is at a high level and the second control end is at a low level, the analog switch U15 is connected to the second gear branch 312; when the first control end is at a high level and the second control end is at a high level, the analog switch U15 is connected to the third gear branch 313.

[0059] In the description of the present application, it should be understood that the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of the present application, "plurality" means at least two, such as two, three, etc., unless otherwise clearly and specifically defined.

[0060] In the embodiments of the present application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral one; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0061] The above are only preferred embodiments of the present application, and do not constitute any formal limitation on the present application. Any technician familiar with the art can use the above disclosed methods and technical contents to make many possible changes and modifications to the technical solution of the present application without departing from the scope of the technical solution of the present application, or modify it into an equivalent embodiment of equivalent changes. Therefore, all equivalent changes made according to the shape, structure and principle of the present application without departing from the content of the technical solution of the present application should be included in the protection scope of the present application.

Claims

1. A photovoltaic power measurement device, characterized in that: include: Power measuring device, inclination measuring device, battery measuring device and processing device; The power measurement device includes: a variable load circuit, a current acquisition circuit and a voltage acquisition circuit, wherein the variable load circuit is used to change its own load to adjust the current in the photovoltaic assembly to be tested, the current acquisition circuit is used to collect the current signal in the photovoltaic assembly to be tested, the voltage acquisition circuit is used to collect the voltage signal in the photovoltaic assembly to be tested, and the processing device is used to obtain the photovoltaic assembly circuit parameters according to the current signal and the voltage signal; The inclination measuring device comprises: an inclination measuring module, the inclination measuring module is used to generate magnetic parameters and spatial parameters, and the processing device is used to generate the inclination parameters according to the magnetic parameters and the spatial parameters; The battery measuring device comprises: a battery power detection circuit, which is used to collect the battery voltage signal of the photovoltaic component to be tested and output it to the processing device.

2. The photovoltaic power measurement device according to claim 1, characterized in that: The variable load circuit includes: a PWM control circuit and a variable load controlled circuit, the PWM control circuit is connected to the variable load controlled circuit, the PWM control circuit is used to provide a PWM signal to the variable load controlled circuit, the variable load controlled circuit is connected to the photovoltaic component to be tested, and the variable load controlled circuit is used to adjust the load according to the PWM signal, thereby adjusting the current in the photovoltaic component to be tested.

3. The photovoltaic power measurement device according to claim 2, characterized in that: The variable load controlled circuit includes: a first adjustment unit, a first variable resistance unit, a second adjustment unit, a second variable resistance unit, a third adjustment unit and a third variable resistance unit, wherein the positive phase input ends of the first adjustment unit, the second adjustment unit and the third adjustment unit are all connected to the PWM control circuit, the first end of the first variable resistance unit is connected to the first adjustment unit, the second end of the first variable resistance unit is connected to the photovoltaic component to be tested, the first end of the second variable resistance unit is connected to the second adjustment unit, the second end of the second variable resistance unit is connected to the photovoltaic component to be tested, the first end of the third variable resistance unit is connected to the third adjustment unit, the second end of the third variable resistance unit is connected to the photovoltaic component to be tested, and the third ends of the first variable resistance unit, the second variable resistance unit and the third variable resistance unit are connected in common.

4. The photovoltaic power measurement device according to claim 3, characterized in that: The first variable resistance unit, the second variable resistance unit and the third variable resistance unit are all MOS tubes.

5. The photovoltaic power measurement device according to claim 3, characterized in that: The first regulating unit, the second regulating unit and the third regulating unit are all operational amplifiers.

6. The photovoltaic power measurement device according to claim 1, characterized in that: The inclination angle measurement module is a chip integrating a magnetometer and an accelerometer.

7. The photovoltaic power measurement device according to claim 1, characterized in that: The tilt angle measurement module is communicatively connected with the processing device via IIC.

8. The photovoltaic power measurement device according to claim 1, characterized in that: The battery power detection circuit includes: an analog switch and a battery gear circuit, the battery gear circuit is connected between the photovoltaic component to be tested and the processing device, and the analog switch is controlled by the processing device and selectively conducts with a branch of the battery gear circuit.

9. The photovoltaic power measurement device according to claim 8, characterized in that: The battery gear circuit includes a first gear branch, a second gear branch and a third gear branch.

10. The photovoltaic power measurement device according to claim 9, characterized in that: The analog switch has a first control terminal and a second control terminal respectively connected to the processing device; When the first control terminal is at a low level and the second control terminal is at a high level, the analog switch is connected to the first gear branch; When the first control terminal is at a high level and the second control terminal is at a low level, the analog switch is connected to the second gear branch; When the first control terminal is at a high level and the second control terminal is at a high level, the analog switch is connected to the third gear branch.

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