CN-122026803-A - Testing device for solar photovoltaic system

CN122026803ACN 122026803 ACN122026803 ACN 122026803ACN-122026803-A

Abstract

The application discloses a testing device for a solar photovoltaic system, which comprises a device body, an irradiance acquisition unit, an angle detection unit, a data processing unit and a calibration compensation unit, wherein the irradiance acquisition unit, the angle detection unit, the data processing unit and the calibration compensation unit are integrated on the device body, the irradiance acquisition unit is used for acquiring irradiance original data of a photovoltaic system testing environment, the angle detection unit is matched with the irradiance acquisition unit and is used for detecting angle parameters of incident light relative to the irradiance acquisition unit in real time, the data processing unit is respectively and electrically connected with the irradiance acquisition unit and the angle detection unit and is used for receiving and preprocessing the original data and the angle parameters, and the calibration compensation unit is electrically connected with the data processing unit. Aiming at the problem of insufficient precision caused by angle deviation in irradiance measurement of the existing photovoltaic testing device, the application realizes the accurate calibration of irradiance angle deviation and remarkably improves the reliability of the testing data of the photovoltaic system.

Inventors

LI SHENGDONG
LV YULIN

Assignees

广西风默新能源有限公司

Dates

Publication Date: 20260512
Application Date: 20260327

Claims (8)

1. The testing device for the solar photovoltaic system is characterized by comprising a device body, and an irradiance acquisition unit, an angle detection unit, a data processing unit and a calibration compensation unit which are integrated on the device body; The irradiance acquisition unit is used for acquiring irradiance raw data of a photovoltaic system testing environment; The angle detection unit is matched with the irradiance acquisition unit and is used for detecting the angle parameter of incident light relative to the irradiance acquisition unit in real time; The data processing unit is respectively and electrically connected with the irradiance acquisition unit and the angle detection unit and is used for receiving and preprocessing the original data and the angle parameters; the calibration compensation unit is electrically connected with the data processing unit, and is used for calibrating and compensating irradiance original data based on the angle parameters and a preset error compensation model, and outputting accurate irradiance data.
2. The test device for a solar photovoltaic system according to claim 1, wherein the irradiance collection unit is integrated with a cosine correction unit that matches cosine response characteristics of a universal standard in the photovoltaic industry for suppressing measurement errors due to angular deviations.
3. The test device for a solar photovoltaic system according to claim 1, wherein the irradiance collection unit is provided with a directional light shielding unit in a matching manner, the directional light shielding unit is used for limiting an effective lighting angle range of the irradiance collection unit, and an inner wall of the directional light shielding unit adopts a extinction treatment process.
4. The test device for a solar photovoltaic system according to claim 1, further comprising a mechanical adjustment unit, wherein the mechanical adjustment unit is in transmission connection with the irradiance collection unit, and the calibration compensation unit drives the mechanical adjustment unit to adjust the posture of the irradiance collection unit according to the angle parameter output by the angle detection unit, so that the irradiance collection unit approaches to the vertical incident light direction.
5. The test device for a solar photovoltaic system according to claim 1, wherein the error compensation model is an angle-compensation coefficient lookup table model, the calibration compensation unit is internally provided with the lookup table model, and calibration compensation of irradiance raw data is completed by matching compensation coefficients corresponding to angle parameters.
6. The test device for a solar photovoltaic system according to claim 1, further comprising at least one auxiliary irradiance collection unit integrated with the device body at a fixed angle, wherein the calibration compensation unit constructs an angle error compensation logic based on a measured data association of the main irradiance collection unit and the auxiliary irradiance collection unit.
7. The testing device for the solar photovoltaic system according to claim 1, further comprising a photovoltaic module parameter acquisition unit, wherein the photovoltaic module parameter acquisition unit is electrically connected with the data processing unit and is used for acquiring electrical parameters of the photovoltaic module, and the calibration compensation unit is used for carrying out auxiliary calibration on irradiance original data by combining the association relation between the electrical parameters and irradiance.
8. The test device for a solar photovoltaic system according to any of claims 1 to 7, further comprising a calibration unit electrically connected to the calibration compensation unit for performing a standardized calibration procedure of reference calibration, angle error calibration and on-site review, updating the error compensation model parameters.

Description

Testing device for solar photovoltaic system Technical Field The application relates to the technical field of solar photovoltaic system testing, in particular to a testing device for a solar photovoltaic system. Background Along with the rapid development of the solar photovoltaic industry, the installation scale of a photovoltaic system is continuously enlarged, and the measurement accuracy requirement of a photovoltaic system testing device is increasingly improved. Irradiance is used as a core influence parameter of the power generation performance of the photovoltaic system, and the measurement accuracy directly determines the reliability of test results such as the conversion efficiency of the photovoltaic module, the power generation potential of the system and the like. At present, in the existing solar photovoltaic system testing device, irradiance acquisition units are easily affected by the angle of incident light, obvious cosine response errors exist, and particularly in outdoor testing scenes, the conditions of oblique incidence of the incident light, mounting posture deviation of the acquisition units and the like frequently occur, so that irradiance original measurement data deviation is larger. In the existing solutions, a part of devices are not provided with special angle calibration units, errors caused by angle deviation cannot be restrained only by means of the precision of the acquisition units, the part of the devices are complex in structure and high in cost, integrated linkage of angle detection and compensation is not realized, the part of devices are only in a single calibration mode, adaptability is poor, precision requirements of different test scenes cannot be met, a standardized calibration unit is lacked, and precision attenuation problems caused by ageing of the acquisition units are difficult to deal with. The above-mentioned prior art is not enough, leads to the photovoltaic system test data accuracy to be insufficient, and then influences the scientificity of photovoltaic system performance evaluation, fault diagnosis and operation and maintenance optimization, therefore, a need has arisen for a photovoltaic system test device that integrates angle detection, calibration compensation function, and simple structure, suitability are strong, can effectively correct irradiance angle deviation. For this purpose, a test device for a solar photovoltaic system is now proposed. Disclosure of Invention The present application aims to solve at least to some extent one of the technical problems in the above-described technology. In order to achieve the above object, a first aspect of the present application provides a testing device for a solar photovoltaic system, comprising a device body, and an irradiance acquisition unit, an angle detection unit, a data processing unit, and a calibration compensation unit integrated on the device body; The irradiance acquisition unit is used for acquiring irradiance raw data of a photovoltaic system testing environment; The angle detection unit is matched with the irradiance acquisition unit and is used for detecting the angle parameter of incident light relative to the irradiance acquisition unit in real time; The data processing unit is respectively and electrically connected with the irradiance acquisition unit and the angle detection unit and is used for receiving and preprocessing the original data and the angle parameters; The calibration compensation unit is electrically connected with the data processing unit, and is used for calibrating and compensating irradiance original data based on the angle parameters and a preset error compensation model, and outputting accurate irradiance data; According to the technical scheme, the integrated linkage of angle detection and calibration compensation is realized, the whole flow of irradiance collection, angle detection, data processing and calibration output is covered, various test scenes of the photovoltaic system are adapted, the measurement error caused by angle deviation can be effectively restrained, the reliability of test data is improved, the unit integration level is high, and the miniaturization requirement of the adapting device is met. In addition, the test device for a solar photovoltaic system according to the present application may further have the following additional technical features: As a further description of the above technical solution: The irradiance acquisition unit is integrated with a cosine correction unit which is matched with the cosine response characteristic of the universal standard in the photovoltaic industry and is used for restraining the measurement error caused by the angle deviation, the technical proposal does not need to rely on a software algorithm, the hardware directly outputs a high-precision measurement result, no calculation force is consumed, the outdoor environment interference resistance capability is high, the cosine correction unit and the acq