CN-122016466-A - Photovoltaic module frame and connecting piece optimization method and system based on strength test

CN122016466ACN 122016466 ACN122016466 ACN 122016466ACN-122016466-A

Abstract

The invention belongs to the technical field of photovoltaic power generation engineering structure test and optimization, and provides a photovoltaic module frame and connecting piece optimization method and system based on an intensity test, wherein two ends of the frame are fixed through a preset upper clamp in a tensile test, purlines are fixed through a preset lower clamp in the tensile test, and the tensile test is performed; the method comprises the steps of fixing purlines by a clamp under a shearing test through the action of the clamp on the frame in a preset shearing test, conducting the shearing test on the frame, correcting according to the tensile measurement rigidity, the temperature correction coefficient and the pretightening force attenuation coefficient to obtain the tensile equivalent rigidity of the actual working condition, correcting according to the linear section slope and the environment friction correction coefficient to obtain the shearing equivalent rigidity of the actual working condition, taking the difference between the environment such as temperature and the actual working condition environment of the photovoltaic module service into consideration, conducting component optimization according to the tensile equivalent rigidity of the actual working condition and the shearing equivalent rigidity of the actual working condition obtained through correction, and guaranteeing the optimization effect of the photovoltaic module.

Inventors

ZHANG ZHENLI
ZHANG YALIN
WANG JINMEI
YIN LIKUN
SU LE
CHEN ZE
Wei Dailin
Shan Daiying
LI SHUANGBAO

Assignees

山东电力工程咨询院有限公司

Dates

Publication Date: 20260512
Application Date: 20260130

Claims (10)

1. The photovoltaic module frame and connecting piece optimization method based on the strength test is characterized by using a test piece comprising a frame, purlines and bolts, and comprises the following steps: Fixing two ends of a frame through a preset tensile test upper clamp, fixing purlines through a preset tensile test lower clamp, and carrying out a tensile test to determine tensile measurement rigidity of a connecting piece bolt; The method comprises the steps that through the action of a preset shearing test upper clamp on a frame, the frame fixes purlines through a shearing test lower clamp, the shearing test is carried out, and the linear section slope of a connecting piece bolt is determined; Correcting according to the tensile measurement rigidity, the temperature correction coefficient and the pretightening force attenuation coefficient to obtain the tensile equivalent rigidity of the actual working condition; And optimizing the test piece according to the tensile equivalent stiffness under the actual working condition and the shearing equivalent stiffness under the actual working condition.
2. The method for optimizing photovoltaic module frame and connecting piece based on strength test as claimed in claim 1, wherein the actual condition tensile equivalent stiffness The method comprises the following steps: ; ; Wherein, the Rigidity is measured for stretch; Is a temperature correction coefficient; Is a pretightening force attenuation coefficient; the target working condition extreme temperature; Is the measured temperature; Is the structural sensitivity coefficient caused by the difference of metal thermal expansion.
3. The method for optimizing photovoltaic module frame and connecting piece based on strength test as claimed in claim 1, wherein the actual condition shear equivalent stiffness The method comprises the following steps: ; Wherein, the For the linear segment slope measured by the test, Is the vertical load increment; is the increment of vertical displacement; is an environmental friction correction coefficient.
4. The photovoltaic module frame and connecting piece optimization method based on the strength test according to claim 1 is characterized in that if the tensile equivalent stiffness of an actual working condition is smaller than a preset lower limit value, the stiffness is insufficient, the preset torque is increased at the moment, the tensile test is conducted again after the bolts of a higher level are replaced or the wall thickness of the frame is increased, if the tensile equivalent stiffness of the actual working condition is larger than a preset upper limit value, the performance is excessive, the bolt specification is reduced or the purlin thickness is reduced at the moment, the tensile test is conducted again, and if the tensile equivalent stiffness of the actual working condition is within a range between the preset lower limit value and the preset upper limit value, the qualification is judged, and the current torque value, the bolt model and the structural parameters are used as final construction basis.
5. The method for optimizing a photovoltaic module frame and a connecting piece based on an intensity test according to claim 1, wherein if the shear stiffness is lower than a theoretical value and the shear displacement corresponding to the yield point is smaller than a preset value, the premature slippage is judged, and the gasket is added.
6. The method of optimizing photovoltaic module frames and connectors according to claim 1, wherein the tensile test upper fixture comprises a first sleeve, a second sleeve, a containing cavity arranged between the first sleeve and the second sleeve, and a first connecting column arranged outside the containing cavity, the tensile test lower fixture comprises a first clamping plate, a second clamping plate, and a plurality of first adjusting rods arranged between the first clamping plate and the second clamping plate, the shear test upper fixture comprises a push plate and a second connecting column vertically arranged on the push plate, and the shear test lower fixture comprises a third clamping plate, a fourth clamping plate, and a plurality of second adjusting rods arranged between the third clamping plate and the fourth clamping plate.
7. Photovoltaic module frame and connecting piece optimizing system based on intensity test, its characterized in that has used the test piece that includes frame, purlin and bolt, the system includes: the tensile test module is configured to fix two ends of the frame through a preset tensile test upper clamp and fix the purline through a preset tensile test lower clamp, and perform a tensile test to determine tensile measurement rigidity of the connecting piece bolt; The shearing test module is configured to determine the linear section slope of the connecting piece bolt through the action of a preset shearing test upper clamp on the frame, the frame fixes the purline through a shearing test lower clamp and the shearing test is carried out; the correction module is configured to obtain the actual working condition tensile equivalent stiffness through correction according to the tensile measurement stiffness, the temperature correction coefficient and the pretightening force attenuation coefficient; and the optimizing module is configured to optimize the test piece according to the tensile equivalent stiffness of the actual working condition and the shearing equivalent stiffness of the actual working condition.
8. A computer readable storage medium having stored thereon a computer program, which when executed by a processor, implements the steps of the method for optimizing a photovoltaic module bezel and connector based on intensity tests according to any of claims 1-6.
9. An electronic device comprising a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor, when executing the program, implements the steps of the method for optimizing photovoltaic module rims and connectors based on intensity tests according to any of claims 1-6.
10. A computer program product, characterized in that it comprises a computer program which, when executed by a processor, implements the steps of the method for optimizing photovoltaic module rims and connectors based on intensity tests according to any of the claims 1-6.

Description

Photovoltaic module frame and connecting piece optimization method and system based on strength test Technical Field The invention belongs to the technical field of photovoltaic power generation engineering structure test and optimization, and particularly relates to a photovoltaic module frame and connecting piece optimization method and system based on an intensity test. Background The node formed by the frame, the bolts and the purlines in the photovoltaic module belongs to a key force transmission path, and the node bears a vertical drawing effect under the action of wind suction. Under the action of lateral wind or gust, the aerodynamic force on the surface of the component can form a horizontal component in the plane of the component and the purline, so that the nodes generate shearing and relative sliding trend. In order to improve the stability of the frame and purlin connection, verification is generally performed through a test mode. The environment such as the temperature of the test scene in the indoor or fixed place has a certain gap with the actual working condition environment of the photovoltaic module service, so that certain errors exist between the data obtained by traditional verification and the related data of the module under the actual working condition, and the module optimizing effect is poor. In addition, when the node test is carried out by the existing test equipment and mode, the frame and the purline cannot be effectively clamped, the connection details of the frame, the bolts and the C-shaped steel purline of the assembly are required to be greatly simplified, the complex boundary conditions such as the actual pre-tightening of the bolts, the bearing of the hole edges, the friction of the contact surface of the frame and the purline and the like cannot be reflected, the local stress concentration of the node is not enough, and the assembly optimizing effect is further influenced. Disclosure of Invention In order to solve the problems, the invention provides a method and a system for optimizing a photovoltaic module frame and a connecting piece based on an intensity test, wherein the method and the system are used for correcting and obtaining the tensile equivalent stiffness of an actual working condition according to the tensile measurement stiffness, a temperature correction coefficient and a pretightening force attenuation coefficient; the difference between the environment such as temperature and the actual working condition environment of the photovoltaic module service is considered, and the module optimization is carried out by the actual working condition tensile equivalent stiffness and the actual working condition shear equivalent stiffness obtained through correction, so that the photovoltaic module optimization effect is ensured. In order to achieve the above object, the present invention is realized by the following technical scheme: in a first aspect, the invention provides a method for optimizing a frame and a connecting piece of a photovoltaic module based on an intensity test, which uses a test piece comprising the frame, purlines and bolts, wherein the method comprises the following steps: Fixing two ends of a frame through a preset tensile test upper clamp, fixing purlines through a preset tensile test lower clamp, and carrying out a tensile test to determine tensile measurement rigidity of a connecting piece bolt; The method comprises the steps that through the action of a preset shearing test upper clamp on a frame, the frame fixes purlines through a shearing test lower clamp, the shearing test is carried out, and the linear section slope of a connecting piece bolt is determined; Correcting according to the tensile measurement rigidity, the temperature correction coefficient and the pretightening force attenuation coefficient to obtain the tensile equivalent rigidity of the actual working condition; And optimizing the test piece according to the tensile equivalent stiffness under the actual working condition and the shearing equivalent stiffness under the actual working condition. Further, the actual condition tensile equivalent stiffnessThe method comprises the following steps: ; ; Wherein, the Rigidity is measured for stretch; Is a temperature correction coefficient; Is a pretightening force attenuation coefficient; the target working condition extreme temperature; Is the measured temperature; Is the structural sensitivity coefficient caused by the difference of metal thermal expansion. Further, the actual working condition shear equivalent stiffnessThe method comprises the following steps: ; Wherein, the For the linear segment slope measured by the test,Is the vertical load increment; is the increment of vertical displacement; is an environmental friction correction coefficient. Further, if the tensile equivalent stiffness of the actual working condition is smaller than a preset lower limit value, the stiffness is insufficient, at the moment, the