CN207896934U - A kind of component generated energy contrast test device - Google Patents

Abstract

The utility model provides a kind of component generated energy contrast test device, detect the generated energy of corresponding number photovoltaic module in real time by multiple power detection devices, and exported by detection output, it realizes the real-time detection for multiple photovoltaic module generated energy, improves measurement accuracy compared with prior art；Also, the number of power detection device is less than preset value, reduces detection range, and then reduce testing cost compared with prior art.

Description

A comparison test device for power generation of components

technical field

The utility model relates to the technical field of photovoltaic power generation, in particular to a comparison test device for power generation of components.

Background technique

Photovoltaic power stations are mainly composed of photovoltaic modules, inverters, box transformers and other electrical equipment and component supports. The power generation of the overall power station has a great relationship with photovoltaic modules. The power generation effect of photovoltaic modules directly affects the total power generation of the power station. Therefore, choosing better photovoltaic modules can greatly improve the overall efficiency of the power station.

Since the factors that affect the power generation effect of photovoltaic modules are not only the types and specifications of photovoltaic modules, but also the power generation effect of the same photovoltaic module is very different in different regions and environments; therefore, in order to select suitable photovoltaic modules, the existing In the technology, professional equipment capable of measuring power generation is generally used for type selection.

The principle adopted by these professional equipment is to obtain data points intermittently, draw a data trend graph, and then calculate the power generation through formula integration. Due to the large deviation, it can only meet some low-precision scenarios. Moreover, in order to achieve a wide range of tests, these professional equipment often cost a lot, and a test equipment costs about 300,000.

Utility model content

The utility model provides a comparison test device for power generation of components to solve the problems of high cost and low precision in the prior art.

In order to achieve the above object, the technical scheme provided by the application is as follows:

A device for comparing power generation of components, including: a casing, an inverter, and N power detection devices, where N is a positive integer greater than 1 and less than a preset value; wherein:

The inverter and the N power detection devices are both arranged inside the casing;

The input terminals of the N power detection devices are respectively used as the positive poles of the N input terminals of the component power generation comparison test device, and are connected to the positive poles of the corresponding photovoltaic modules;

The output terminals of the N power detection devices are respectively connected to the positive poles of the DC side of the inverter;

The ground terminals of the N power detection devices are respectively connected to the negative poles of the DC side of the inverter, and serve as the negative poles of the N input terminals of the component power generation comparison test device, and the photovoltaic modules connected to their own input terminals. connected to the negative pole;

The signal terminals of the N power detection devices are used as the N detection output terminals of the component power generation comparison test device;

The AC side of the inverter is used as the power output end of the component power generation comparison test device, and is connected to the grid-connected power supply.

Preferably, the power detection device includes: a current sampling device and a DC meter; wherein:

The input end of the current sampling device is the input end of the power detection device;

The output end of the current sampling device is the output end of the power detection device;

The input end and output end of the current sampling device are respectively connected to the current sampling end of the DC ammeter;

The voltage sampling terminal of the DC ammeter is the ground terminal of the power detection device;

The output end of the DC ammeter is the signal end of the power detection device.

Preferably, the current sampling device is a shunt.

Preferably, it also includes: a waterproof meter box wrapping the DC meter.

Preferably, the housing is a waterproof protective box, and the waterproof protective box is provided with a toughened glass window at a position corresponding to the DC meter.

Preferably, it also includes: waterproof terminals provided at the power output terminal, the positive poles and negative poles of the N input terminals, and the N detection output terminals of the component power generation comparison test device.

Preferably, the power supply end of the DC ammeter is connected to the grid-connected power supply.

Preferably, N is 2, and the inverter is a micro inverter.

Preferably, the N detection output terminals of the component power generation comparison test device are connected to the host computer through a 485 serial port line.

The power generation comparison test device provided by the utility model detects the power generation of the corresponding number of photovoltaic modules in real time through a plurality of power detection devices, and outputs through the detection output terminal to realize real-time detection of the power generation of multiple photovoltaic modules. The prior art improves the measurement accuracy; moreover, the number of power detection devices is lower than the preset value, which reduces the detection range, thereby reducing the detection cost compared with the prior art.

Description of drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the accompanying drawings that need to be used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the accompanying drawings in the following description These are only some embodiments of the utility model, and those skilled in the art can also obtain other drawings based on these drawings without creative work.

Fig. 1 is a schematic structural diagram of a comparison test device for power generation of components provided by an embodiment of the present invention;

Fig. 2 is a schematic diagram of the connection of the component power generation comparison test device provided by the embodiment of the present invention;

Fig. 3 is an internal structure diagram of a device for comparing power generation of modules provided by another embodiment of the present invention.

Detailed ways

The following will clearly and completely describe the technical solutions in the embodiments of the application with reference to the drawings in the embodiments of the application. Apparently, the described embodiments are only some of the embodiments of the application, not all of them. Based on the embodiments in this application, all other embodiments obtained by persons of ordinary skill in the art without creative efforts fall within the protection scope of this application.

The utility model provides a comparison test device for power generation of components to solve the problems of high cost and low precision in the prior art.

Specifically, referring to FIG. 1 , the component power generation comparison test device includes: a housing, an inverter 102, and N power detection devices 101, where N is a positive integer greater than 1 and less than a preset value; where:

The inverter 102 and the N power detection devices 101 are both arranged inside the casing;

The input terminals of the N power detection devices 101 are respectively used as the positive poles of the N input terminals of the component power generation comparison test device, and are connected to the positive poles of the corresponding photovoltaic modules;

The output terminals of the N power detection devices 101 are respectively connected to the positive poles of the DC side of the inverter 102;

The ground terminals of the N power detection devices 101 are respectively connected to the negative poles of the DC side of the inverter 102, and are used as the negative poles of the N input terminals of the component power generation comparison test device, and are connected to the negative poles of the photovoltaic modules connected to the input terminals;

The signal terminals of the N power detection devices 101 are used as N detection output terminals of the component power generation comparison test device;

The AC side of the inverter 102 is used as the power output end of the component power generation comparison test device, and is connected to the grid-connected power supply. Preferably, the grid-connected power supply is AC220V power supply.

Preferably, N is 2, and the inverter 102 is a micro-inverter. Of course, N can also take other values, such as 3, depending on the specific application environment, and the selection of the inverter 102 will also change accordingly. All schemes for testing the power generation of components are within the protection scope of the present application.

Preferably, the N detection output terminals of the component power generation comparison test device are connected to the host computer through a 485 serial port line.

Figure 1 takes N=2 as an example to show, and Figure 2 is a schematic diagram of the connection of the power generation comparison test device for the power generation comparison test of two photovoltaic modules; the following takes N=2 as an example to explain the specific working principle :

When performing a comparison test of power generation, it is only necessary to connect the two input ends of the power generation comparison test device of the component to two corresponding photovoltaic modules. After ensuring the connection is correct, connect the power generation comparison test device of the component to With AC220V power supply, the overall equipment can operate normally.

Through the two power detection devices 101 in the component power generation comparison test device, the power generation of two photovoltaic modules can be directly and simultaneously measured in real time and accurately, and uploaded to the host computer through the 485 serial port line, and then directly view the two photovoltaic modules through the host computer. The power generation of photovoltaic modules, and save the data on the host computer.

The component power generation comparison test device provided in this embodiment detects the power generation of the corresponding number of photovoltaic modules in real time through a plurality of power detection devices 101, and realizes the real-time detection of the power generation of multiple photovoltaic modules by detecting the output of the output terminal. The data obtained by the test is real-time data, the error is very small, and the measurement accuracy is improved compared with the prior art; and the number of power detection devices 101 is lower than the preset value, which reduces the detection range, thereby reducing the power consumption compared with the prior art. Testing costs.

It is worth noting that the professional equipment that can measure power generation in the prior art can only be used in indoor environments due to the wide range of testing and the need for heat dissipation. However, the environment where photovoltaic modules are actually used usually has shadows and weak light. Factors that affect the power generation effect, such as temperature loss, pollution loss, etc., further increase the deviation between the test results and the actual situation.

However, the device for comparing power generation of the module provided in this embodiment generates very little heat during the test, and can be completely sealed as a tool for testing, which can adapt to harsh outdoor environments and improves the reliability of test results.

Another embodiment of the utility model also provides a specific device for comparing the power generation of components. On the basis of the above embodiment and FIG. 1, preferably, referring to FIG. 3, the power detection device 101 includes: a current sampling device 111 and DC meter 112; where:

The input end of the current sampling device 111 is the input end of the power detection device 101;

The output end of the current sampling device 111 is the output end of the power detection device 101;

The input end and the output end of the current sampling device 111 are respectively connected with the current sampling end of the DC ammeter 112;

The voltage sampling terminal of the DC ammeter 112 is the ground terminal of the power detection device 101;

The output end of the DC ammeter 112 is the signal end of the power detection device 101 .

Preferably, the current sampling device 111 is a shunt.

Preferably, the power supply terminal of the DC ammeter 112 is connected to a grid-connected power supply.

The DC meter 112 can directly display the data, which is convenient for observation, and can make the power generation comparison test device of this component applied in an environment without a host computer; if it is necessary to monitor the power generation comparison of each photovoltaic module in real time and save historical data, it can be reused 485 serial cable to upload to the host computer.

As shown in Figure 3, the resistance value R of the shunt is at the milliohm level, and it is connected in series in the circuit, which has almost no effect on the loop current value I formed by the power generation comparison test device of the module and the photovoltaic module. The DC meter 112 collects the voltage value U1 at both ends of the shunt, and the current value I obtained according to Ohm's law I=U/R, this current value is the current value I of the main circuit, that is, the current when the photovoltaic module is working. The DC meter 112 passes through and is on the positive and negative poles of the photovoltaic module, and can directly collect the voltage value U of the photovoltaic module when it is working, and can directly calculate the overall power generation of the photovoltaic module in any time period according to P=UI and W=Pt. It is also possible to directly measure the generated power at a certain moment.

In this embodiment, the component power generation comparison test device calculates the total power generation through real-time measurement of current and voltage values and integration. The data is very accurate and analytical, and can adapt to very rigorous tests.

Another embodiment of the utility model also provides a specific component power generation comparison test device, on the basis of the above embodiment and Figure 1, preferably, the component power generation comparison test device also includes: wrapped DC ammeter 112 Waterproof meter box.

Preferably, the casing is a waterproof protective box, and the waterproof protective box is provided with a toughened glass window at a position corresponding to the DC meter. Through the toughened glass window on the waterproof protection box, the data of the DC ammeter 112 can be directly observed.

Preferably, the device for comparing power generation of the module further includes: waterproof terminals provided at the power output end, the positive poles and negative poles of the N input terminals, and the N detection output ends of the device for comparing the power generation of the module.

In order to make the power generation comparison test device of the module adapt to the harsh outdoor environment, the power generation comparison test device of the module should also have a waterproof function. Therefore, in this embodiment, the power generation comparison test device of the module realizes External protection, and provide further waterproof protection for the DC ammeter 112 through a waterproof ammeter box.

The remaining structures and principles are the same as those of the above-mentioned embodiments, and will not be repeated here.

Each embodiment of the utility model is described in a progressive manner, each embodiment focuses on the differences from other embodiments, and the same and similar parts of each embodiment can be referred to each other.

The above descriptions are only preferred embodiments of the present utility model, and are not intended to limit the present utility model in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. Any person familiar with the art, without departing from the scope of the technical solution of the present utility model, can use the method and technical content disclosed above to make many possible changes and modifications to the technical solution of the utility model, or modify it to an equivalent change Equivalent embodiment. Therefore, any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention are still within the protection scope of the technical proposal of the present invention.

Claims (9)

1. A comparison test device for component power generation, characterized in that it includes: a casing, an inverter and N power detection devices, where N is a positive integer greater than 1 and less than a preset value; wherein: The inverter and the N power detection devices are both arranged inside the casing; The input terminals of the N power detection devices are respectively used as the positive poles of the N input terminals of the component power generation comparison test device, and are connected to the positive poles of the corresponding photovoltaic modules; The output terminals of the N power detection devices are respectively connected to the positive poles of the DC side of the inverter; The ground terminals of the N power detection devices are respectively connected to the negative poles of the DC side of the inverter, and serve as the negative poles of the N input terminals of the component power generation comparison test device, and the photovoltaic modules connected to their own input terminals. connected to the negative pole; The signal terminals of the N power detection devices are used as the N detection output terminals of the component power generation comparison test device; The AC side of the inverter is used as the power output end of the component power generation comparison test device, and is connected to the grid-connected power supply. 2. The device for comparing power generation of components according to claim 1, wherein the power detection device comprises: a current sampling device and a DC ammeter; wherein: The input end of the current sampling device is the input end of the power detection device; The output end of the current sampling device is the output end of the power detection device; The input end and output end of the current sampling device are respectively connected to the current sampling end of the DC ammeter; The voltage sampling terminal of the DC ammeter is the ground terminal of the power detection device; The output end of the DC ammeter is the signal end of the power detection device. 3 . The device for comparing power generation of components according to claim 2 , wherein the current sampling device is a shunt. 4 . 4 . The device for comparing power generation of components according to claim 2 , further comprising: a waterproof meter box enclosing the DC meter. 5 . 5 . The device for comparing power generation of components according to claim 2 , wherein the housing is a waterproof protective box, and the waterproof protective box is provided with a toughened glass window at a position corresponding to the DC meter. 5 . 6. The device for comparing power generation of components according to claim 2, further comprising: a power output terminal, N positive poles and negative poles of input terminals, and N detection outputs arranged on the power generation comparison test device for components. end of the waterproof terminal. 7. The device for comparing power generation of components according to claim 2, wherein the power supply end of the DC ammeter is connected to the grid-connected power supply. 8. The device for comparing power generation of components according to any one of claims 1-7, wherein N is 2, and the inverter is a micro-inverter. 9. The device for comparing power generation of components according to any one of claims 1-7, characterized in that the N detection output terminals of the device for comparing power generation of components are connected to the host computer through a 485 serial port line.