CN-121980987-A - Dynamic model construction method of power generation umbrella ladder

CN121980987ACN 121980987 ACN121980987 ACN 121980987ACN-121980987-A

Abstract

The invention relates to a dynamic model construction method of a power generation umbrella ladder, and belongs to the technical field of wind power generation. The invention adopts an umbrella ladder type land-based high-altitude wind power generation technology, places a generator on the ground, captures wind energy by utilizing an air flight assembly to drive a cable to reciprocate, pulls a ground generator turntable to rotate, thereby generating electric energy, is divided into three stages of an initial floating stage, a working stage and a recovery stage, builds a dynamic model for the three stages, and carries out dynamic simulation and analysis to obtain the power generation and dynamic process of a power generation umbrella ladder, and is used for designing and analyzing stability of a power generation system for supporting the umbrella ladder. The invention can support the development of umbrella ladder type land-based high-altitude wind power generation.

Inventors

GONG YIMING
WU ZHUO
CAO XU
JIA HUAMING
LI SHAOTENG

Assignees

北京空间机电研究所

Dates

Publication Date: 20260505
Application Date: 20251218

Claims (10)

1. The method for constructing the dynamic model of the power generation umbrella ladder is characterized by comprising the following steps of: (1) Determining the connection form and the working state of the power generation umbrella ladder; (2) Calculating aerodynamic coefficients of the power generation umbrella ladder under different attack angles; (3) Constructing a power generation umbrella ladder dynamics model, and performing dynamic simulation analysis; (4) And (3) optimizing the power generation umbrella ladder, changing relevant input parameters of the power generation umbrella ladder when the optimization result does not meet the requirement, and repeatedly executing the step (3) until the optimization result meets the requirement, and performing outfield test verification.
2. The dynamic model construction method of the power generation umbrella ladder is characterized in that a ground system is sequentially connected with an aerial acting system, a stable flight system and a floating system through cables, the ground system is a generator, the floating system is a helium balloon, the stable flight system is a plurality of balance umbrellas which are sequentially nested on the cables, the acting system is a plurality of acting umbrellas, and each acting umbrella is connected end to end through the cables.
3. The method for constructing a dynamic model of a power generation umbrella ladder according to claim 2, wherein the power generation umbrella ladder dynamic model is constructed according to three stages of an initial floating stage, a working stage and a recovery stage.
4. The method for constructing a dynamic model of a power generation umbrella ladder according to claim 3, wherein the power generation umbrella ladder is lifted to an open height under the traction of helium balls and balance umbrellas in the initial floating stage, and the power generation umbrella is in a closed state in the stage; the working stage is characterized in that a working umbrella is opened, and a winch is switched to a power generation mode; And in the recovery stage, the acting umbrella is closed, the acting umbrella is retracted, the descending action is completed after the acting umbrella reaches the lowest position, and then the acting stage of the next round is continued.
5. A method for constructing a kinetic model of a power generation umbrella ladder according to claim 3, wherein the step of dynamically simulating and analyzing the initial floating stage comprises the steps of: dispersing the cables, taking the balance umbrella as mass points, and taking the acting force of the balance umbrella on the cables as the concentrated force of the corresponding mass points on the cables; Sequentially carrying out stress balance analysis on each unit of the cable to obtain the shape of the balanced state of the cable and obtain the tension of a ground system And inclination angle ; Fixed ground system tension And inclination angle Calculating the minimum helium sphere volume and the aerodynamic force of the balance umbrella when the power generation umbrella ladder reaches the umbrella opening height of the acting umbrella at a constant speed; obtaining the opening area of the balance umbrella; and then carrying out finite element analysis on each unit of the cable to obtain the tensile deformation of the cable, and carrying out strength check.
6. The method for constructing a dynamic model of a power generation umbrella ladder as claimed in claim 5, wherein the stress balance analysis comprises stress balance analysis along the direction of the cable unit and stress balance analysis along the normal direction of the cable unit, and is specific to the first step Each cable unit: After the stress balance analysis along the direction of the cable unit, the following steps are obtained: after the normal stress balance analysis of the cable unit, the following steps are obtained: Wherein, the Is the first The upper end tension of each cable unit, Is the first The lower end tension of each cable unit; aerodynamic force of the umbrella ladder aerial assembly part is obtained by aerodynamic numerical simulation and wind tunnel test; Is the first The weight of the individual cable units is calculated, Is the first Tension of each cable unit The direction included angle of each cable unit, Is the first The angle between the direction of each cable unit and the direction of gravity.
7. The method for constructing a dynamic model of a power generation umbrella ladder as claimed in claim 6, wherein the method comprises the following steps of Its initial value is helium balloon buoyancy , Wherein, the method comprises the steps of, Is the incoming flow density; Helium density in helium balloon; Gravitational acceleration; Is the volume of helium balloon.
8. The method for constructing a kinetic model of a power generation umbrella ladder according to claim 3, wherein the dynamic simulation analysis of the working phase comprises the following steps: In the preliminary analysis of dynamic simulation, the space between acting umbrellas is assumed to be equal, and only the aerodynamic force of the acting umbrellas and the balancing umbrellas along the cable direction is considered; Carrying out stress balance analysis on each unit in the cable; The aerodynamic force of the acting umbrella under different attack angles is obtained by aerodynamic numerical simulation and wind tunnel test, all cable units are sequentially subjected to stress analysis to obtain the shape of the balanced state of the cable and the tension of a ground system And inclination angle ; Tension for securing ground system And inclination angle Calculating aerodynamic indexes of the acting umbrella required by the power generation umbrella ladder in a state of reaching preset power generation power; Obtaining the opening area of the acting umbrella; the load and deformation on the cable is then solved by finite element analysis.
9. The method for constructing the dynamic model of the power generation umbrella ladder of claim 8, wherein after the preliminary analysis of the dynamic simulation, the lateral forces of the acting umbrella and the balance umbrella are added, whether a cable can topple over in the acting stage is further analyzed, and meanwhile, the optimal acting scheme design is sought through changing the distance and the number of the acting umbrella.
10. The method for constructing a kinetic model of a power generation umbrella ladder according to claim 5, wherein the kinetic simulation analysis of the recovery stage is to calculate the work done by the winch and the position of the cable when the cable returns to the lowest position from the highest point, so as to obtain the initial state of the working stage of the next stage; The dynamic simulation analysis method in the recovery stage is the same as that in the initial floating stage, except that the initial cable position state is the same, and the cable speed direction is opposite.

Description

Dynamic model construction method of power generation umbrella ladder Technical Field The invention belongs to the technical field of wind power generation, and relates to a dynamic model construction method of a power generation umbrella ladder. Background The high-altitude wind power generation technology is an innovative technology for generating power by capturing high-altitude resources. The umbrella ladder type land-based high-altitude wind power generation technology is characterized in that a generator is arranged on the ground, wind energy captured by an aerial flight assembly is utilized to drive a cable to reciprocate, and a ground generator turntable is pulled to rotate, so that electric energy is generated. The umbrella ladder system specifically works by lifting the umbrella ladder to the height of the umbrella under the traction of a helium balloon and a balance umbrella, and driving a cable to move upwards under the action of wind force after the umbrella is opened by the acting umbrella, wherein the cable pulls a ground motor/generator to convert mechanical energy into electric energy. After the umbrella ladder reaches a preset height at the current wind speed, the acting umbrella is closed, the motor/generator is reversed, the umbrella ladder is retracted to the umbrella opening height, the process is repeated, and wind energy is converted into electric energy in a reciprocating mode. The umbrella ladder type high-altitude wind power generation system mainly comprises an aerial umbrella ladder component, a traction component and a ground power generation component. The acting umbrella is an important component of an aerial umbrella ladder part, and is one of the keys of whether the system can catch wind efficiently. Because the umbrella ladder type high-altitude wind power generation technology is a very new technology, no dynamic model aiming at the power generation umbrella ladder exists at present, relevant researches are urgently needed to be developed to fill the gap, and a dynamic model is constructed to carry out dynamic simulation. Disclosure of Invention The invention solves the technical problem of overcoming the defects of the prior art and provides a dynamic model construction method of a power generation umbrella ladder. The technical scheme of the invention is that the dynamic model construction method of the power generation umbrella ladder comprises the following steps: (1) Determining the connection form and the working state of the power generation umbrella ladder; (2) Calculating aerodynamic coefficients of the power generation umbrella ladder under different attack angles; (3) Constructing a power generation umbrella ladder dynamics model, and performing dynamic simulation analysis; (4) And (3) optimizing the power generation umbrella ladder, changing relevant input parameters of the power generation umbrella ladder when the optimization result does not meet the requirement, and repeatedly executing the step (3) until the optimization result meets the requirement, and performing outfield test verification. The power generation umbrella ladder is characterized in that a ground system is sequentially connected with an aerial acting system, a stable flying system and a floating system through cables, the ground system is a generator, the floating system is a helium balloon, the stable flying system is a plurality of balance umbrellas which are sequentially nested on the cables, the acting system is a plurality of acting umbrellas, and each acting umbrella is connected end to end through the cables. Furthermore, the power generation umbrella ladder dynamic model is constructed according to three stages of an initial floating stage, a working stage and a recovery stage. Further, in the initial floating stage, the power generation umbrella ladder is lifted to the height of the umbrella under the traction of the helium balloon and the balance umbrella, and in the stage, the acting umbrella is in a closed state; the working stage is characterized in that a working umbrella is opened, and a winch is switched to a power generation mode; And in the recovery stage, the acting umbrella is closed, the acting umbrella is retracted, the descending action is completed after the acting umbrella reaches the lowest position, and then the acting stage of the next round is continued. Further, the dynamic simulation analysis step of the initial floating stage comprises the following steps: dispersing the cables, taking the balance umbrella as mass points, and taking the acting force of the balance umbrella on the cables as the concentrated force of the corresponding mass points on the cables; Sequentially carrying out stress balance analysis on each unit of the cable to obtain the shape of the balanced state of the cable and obtain the tension of a ground system And inclination angle; Fixed ground system tensionAnd inclination angleCalculating the minimum helium sphere volume and the aerodyna