CN-122021145-A - Flexible foundation photovoltaic support structure design method suitable for goaf

CN122021145ACN 122021145 ACN122021145 ACN 122021145ACN-122021145-A

Abstract

Aiming at the problems of complex geological conditions and uneven ground surface subsidence of a goaf, the invention provides a subsidence response unit and an initial structural model by acquiring subsidence gradient distribution and foundation bearing capacity distribution, carrying out finite element simulation analysis, extracting displacement characteristic quantity and a connecting node stress state, establishing a response adaptability index system, constructing an objective function based on an adjustable parameter set, and iteratively updating parameters through a particle swarm optimization algorithm to finally generate an optimal structural design scheme.

Inventors

HUANG QIUQI
FAN HAIJUN
CHEN BIN
TANG GUANGXUE
HUANG KAIXI
WANG JIE

Assignees

杭州爱储数字能源技术有限公司

Dates

Publication Date: 20260512
Application Date: 20260122

Claims (7)

1. A design method of a flexible foundation photovoltaic bracket structure suitable for a goaf is characterized by comprising the following steps: S100, obtaining geological parameter information of a target goaf, wherein the geological parameter information comprises sedimentation gradient distribution and foundation bearing capacity distribution; s200, establishing an initial design model of the goaf flexible foundation photovoltaic support structure according to the acquired sedimentation gradient distribution and foundation bearing capacity distribution; S300, performing finite element simulation calculation on an initial design model, and simulating structural response under the actions of preset settlement load, wind load and snow load to obtain displacement characteristic quantity V of a key part of the structure and stress state M of a connecting node; S400, constructing a response adaptability index system W of the flexible basic structure based on the displacement characteristic quantity V and the stress state M of the connecting node; s500, carrying out association analysis on a response adaptability index system W and a structure adjustable parameter set P, and establishing an objective function F; S600, updating the structure adjustable parameter set P by adopting an iterative optimization algorithm to obtain an optimal flexible basic structure design parameter set To maximize the objective function F; s700 based on And generating a flexible basic photovoltaic bracket structural design scheme which is finally suitable for the goaf geological conditions and is used for practical construction and deployment.
2. The method for designing the flexible foundation photovoltaic support structure suitable for the goaf according to claim 1, wherein the structure-adjustable parameter set P comprises support height difference adjustment amplitude, flexible node rigidity coefficient and foundation spacing.
3. The method for designing the flexible foundation photovoltaic support structure for the goaf according to claim 1, wherein the step of establishing an initial design model of the flexible foundation photovoltaic support structure for the goaf comprises the following steps: s201, dividing a goaf into a plurality of settlement response units according to settlement gradient distribution, and determining a corresponding allowable basic displacement range for each settlement response unit; S202, determining arrangement intervals and basic bearing parameters of a flexible foundation according to foundation bearing capacity distribution corresponding to each settlement response unit, and taking the basic bearing parameters as boundary constraint conditions of an initial design model; s203, under the boundary constraint condition, constructing a three-dimensional structure model comprising flexible upright posts, flexible connection nodes and a basic contact surface; And S204, correlating the three-dimensional structure model with the spatial position relation of each settlement response unit to form an initial design model.
4. The method for designing the flexible foundation photovoltaic support structure suitable for the goaf according to claim 1, wherein the finite element simulation calculation of the initial design model comprises the following steps: s301, importing the initial design model into a finite element analysis platform, setting a nonlinear foundation spring unit according to geological parameters of each settlement response unit, and simulating basic contact boundary conditions; s302, applying a multi-condition combined load combination comprising uneven settlement load, regional wind load and equivalent snow load, and adopting a static loading mode to carry out initial design model solving; s303, recording vertical and lateral displacement of the top of each flexible upright post in the initial design model, calculating to obtain a displacement characteristic quantity V of a key part of the structure, and judging whether the displacement characteristic quantity V exceeds a preset displacement tolerance; s304, extracting the internal force response of each flexible connection node under the maximum deformation working condition, and generating a connection node stress state M.
5. The method for designing the flexible foundation photovoltaic support structure suitable for the goaf according to claim 1, wherein the construction of the response adaptability index system W of the flexible foundation structure comprises the following steps: S401, carrying out statistics normalization processing on displacement characteristic quantities of key parts of the structure, and extracting maximum displacement difference, average displacement and standard deviation as deformation indexes; s402, carrying out stress amplitude normalization on stress states of all flexible connection nodes, and extracting maximum bending moment, maximum shearing force and maximum axial force values as connection strength indexes; s403, constructing a two-dimensional response adaptability index vector containing deformation indexes and connection strength indexes based on the extracted connection strength indexes; S404, comparing the two-dimensional response adaptability index vector with a structural safety threshold value, and marking the two-dimensional response adaptability index vector as a response adaptability index system W.
6. The method for designing the flexible foundation photovoltaic support structure suitable for the goaf according to claim 2, wherein the correlation analysis of the response adaptability index system W and the structure adjustable parameter set P comprises the following steps: S501, a structure adjustable parameter set P is set, wherein the structure adjustable parameter set P comprises a support height difference adjustment amplitude, a rigidity coefficient of a flexible connection node and an arrangement interval of a flexible foundation, and the arrangement interval is respectively recorded as P1, P2 and P3; s502, constructing a function mapping relation between each index component in the P1, P2 and P3 and the response adaptability index system based on the structural finite element simulation calculation result; s503, a weighted square sum of the differences between the minimum indices and their corresponding safety thresholds is adopted as an expression of the objective function F.
7. The method for designing the flexible foundation photovoltaic bracket structure suitable for the goaf according to claim 1, wherein the updating of the structure-adjustable parameter set P by adopting the iterative optimization algorithm comprises the following steps: s601, selecting an initial structure adjustable parameter set P, and substituting the initial structure adjustable parameter set P into an objective function F to perform adaptive performance calculation; s602, carrying out parameter disturbance on P based on a particle swarm optimization algorithm to generate a candidate solution set, and calculating objective function values corresponding to each candidate solution; S603, selecting a parameter solution with optimal adaptability according to a minimum objective function value principle, and generating a new round of candidate parameters by iteration based on a parameter set; S604, when the objective function value in the continuous iteration is converged to the preset threshold variation range, determining the current parameter set as the optimal flexible basic structure design parameter set 。

Description

Flexible foundation photovoltaic support structure design method suitable for goaf Technical Field The invention relates to the technical field of photovoltaic support structure design optimization, in particular to a flexible foundation photovoltaic support structure design method suitable for a goaf. Background At present, with the progress of the strategy of double carbon and the increasing prominence of land resource shortage, goaf lands are gradually developed and utilized for photovoltaic power station construction due to the wide area. However, the goaf is used as an underground cavity area after coal or mineral resource exploitation, and the ground surface of the goaf has typical problems of uneven settlement, foundation disturbance, poor structural stability and the like, so that the traditional rigid photovoltaic bracket faces a plurality of challenges in practical application. Specifically, the traditional photovoltaic support structure is directly anchored on the ground surface by adopting a rigid foundation (such as a concrete independent foundation or a pile foundation), so that the traditional photovoltaic support structure cannot effectively absorb and adapt to the geological deformation such as slow or sudden sedimentation, horizontal displacement and the like of the ground surface of a goaf, and is easy to warp, incline and even wholly collapse, and the power generation efficiency and the service life of the photovoltaic array are seriously affected. Particularly, when 'nonlinear uneven settlement' exists on the ground surface (namely settlement displacement of different bracket bases with different amplitudes and directions in unit time), the whole structure is difficult to cooperatively respond, and the nonlinear uneven settlement is a common cause of bracket damage. In addition, due to the fact that the goaf geological structure is high in complexity, sedimentation mechanism differences of different areas are obvious, and a design method which has structural flexibility, can dynamically respond to sedimentation and can conduct parameter adjustment optimization according to different goaf working conditions is not available at present. The prior art often depends on an empirical formula for presetting, lacks a data-driven analysis and feedback optimization mechanism, and cannot cooperatively design the relationship among a basic form, a connection structure and geological settlement parameters from a system angle. Therefore, how to provide a design method for performing analysis modeling based on geologic settlement response parameters and realizing intelligent optimization of support basic design parameters by combining flexible connection and structure adjustment mechanisms becomes a key technical problem to be solved currently. Disclosure of Invention The invention aims to provide a flexible foundation photovoltaic support structure design method suitable for a goaf, and aims to solve the defects in the background technology. In order to achieve the above purpose, the invention provides the following technical scheme that the flexible foundation photovoltaic support structure design method suitable for the goaf comprises the following steps: S100, obtaining geological parameter information of a target goaf, wherein the geological parameter information comprises sedimentation gradient distribution and foundation bearing capacity distribution; s200, establishing an initial design model of the goaf flexible foundation photovoltaic support structure according to the acquired sedimentation gradient distribution and foundation bearing capacity distribution; S300, performing finite element simulation calculation on an initial design model, and simulating structural response under the actions of preset settlement load, wind load and snow load to obtain displacement characteristic quantity V of a key part of the structure and stress state M of a connecting node; S400, constructing a response adaptability index system W of the flexible basic structure based on the displacement characteristic quantity V and the stress state M of the connecting node; s500, carrying out association analysis on a response adaptability index system W and a structure adjustable parameter set P, and establishing an objective function F; S600, updating the structure adjustable parameter set P by adopting an iterative optimization algorithm to obtain an optimal flexible basic structure design parameter set To maximize the objective function F; s700 based on And generating a flexible basic photovoltaic bracket structural design scheme which is finally suitable for the goaf geological conditions and is used for practical construction and deployment. Preferably, the structure adjustable parameter set P includes a bracket height difference adjustment amplitude, a flexible node rigidity coefficient and a basic distance. Preferably, the establishing the initial design model of the goaf flexible foundation photovoltaic support