A novel ultralight dish system based on a three-extensible-rod solar tracker

Zheng, Tao; Zheng, Fei; Rui, Xi; Xiang, Ji; Niu, Kui

doi:10.1016/j.solener.2019.09.026

Cited by 9 publications

(4 citation statements)

References 22 publications

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“…On the other hand, Zheng et al 37 evaluated the solar tracker's tracking error controlled by three extendable rods given motion by the stepper motors. To evaluate the tracker's accuracy, they calculated the shadow cast by a rod on a test board (Figure 6A).…”

Section: Resultsmentioning

confidence: 99%

Performance assessment of a dual‐axis solar tracker for concentrator photovoltaic systems

Badr

Radwan

Ahmed

et al. 2022

Intl J of Energy Research

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Summary Enhancing the performance of a concentrator photovoltaic (CPV) system by integrating a solar tracker to concentrate the solar irradiance on the target area is important. Thus, a dual‐axis elliptic solar tracker is designed, fabricated, and experimentally evaluated. The altitude and solar azimuth angles of the tracker are adjusted based on governing equations to track the sun. The tracker's error is measured using a series of light‐dependent resistors. Then, the tracker is used to assess the CPV system's performance at a solar concentration ratio of 50. The results indicated that the maximum error in solar azimuth and altitude angles equals 0.5°. Furthermore, the measured errors are independent of dust and cloudy weather. By integrating the concentrator PV system and solar tracker, the direct normal irradiance slightly varies throughout the day from 750 to 980 W/m2. At this condition, the maximum measured solar cell temperature is approximately 42°C with a maximum attained electric power of 1.08 W for a solar cell area of 1.012 cm2.

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Section: Resultsmentioning

confidence: 99%

Performance assessment of a dual‐axis solar tracker for concentrator photovoltaic systems

Badr

Radwan

Ahmed

et al. 2022

Intl J of Energy Research

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“…This paper takes the representative Effelsberg antenna as the prototype, under the condition that the other structures except the reflector remain unchanged, and the research is carried out by replacing the umbrella backup structure. Based on the previous experience with a deployable antenna and cable net structure (Rui et al 2020(Rui et al , 2021Zheng et al 2019a,b, 2020, through repeated analysis, comparison, modeling and attempts, we put forward a new reflector structure scheme for large radio telescopes. The system structure of the reflector mainly includes two parts: the back-up structure and the reflecting surface, as illustrated in Figure 1.…”

Section: Design Scheme For Reflectormentioning

confidence: 99%

New design of large fully-steerable radio telescope reflector based on homogenized mesh structure

Yan

Zheng

Rui

2021

Res. Astron. Astrophys.

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The self-weight of a large fully-steerable radio telescope is one of the important factors affecting its performance. In the existing reflector system scheme, the problem of surface accuracy caused by its large and heavy structure has seriously restricted the application and implementation of large radio telescopes. Therefore, a new mesh structure scheme for a large fully-steerable radio telescope reflector is proposed in this paper. This scheme is based on a homogenized mesh back-up structure in the form of a quasi-geodesic grid and regular quasi-tri-prism or tetrahedron, which can significantly reduce the structural complexity and self-weight of the reflector under the condition that the reflector can meet the desired performance requirements. Finally, the feasibility and rationality of the scheme are evaluated by numerical simulation analysis, which has significant advantages and provides a new design for the reflector of a large fully-steerable radio telescope.

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“…The experimental results also show that actual sun tracking is carried out only from 11:15 am to 3:30 pm. Zheng et al [12, 13] proposed an ultralight dish solar convergence tracking system based on 3-RPS, where the spherical joint is designed as a composite hinge composed of a hook hinge and a rotary hinge. Compared with general form 3-RPS, although the motion space of the new type 3-RPS has increased, the forces on the composite hinge are unreasonable and not easy to keep balance, and the rigidity and the support ability of the tracking mechanism also become lower.…”

Section: Introductionmentioning

confidence: 99%

Design, modeling and solar tracking control for a novel parabolic dish solar concentrator

et al. 2023

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A novel parabolic dish solar concentrator based on the improved 3-RPS parallel manipulator to drive the reflective mirror facet is proposed and designed, which can not only automatically adjust the position and orientation of the reflective mirror facet but also have the advantages of independent drive, high stiffness and no cumulative error. Then, using the coordinate transformation matrixes of the novel parabolic dish solar tracking platform, the kinematics models of the 3-RPS parallel manipulators associated with the solar altitude and azimuth angles are established. The altitude and azimuth angles of the solar movement at the installation location are calculated according to the calculation formula of solar position. To solve the problem of too many telescopic rods of the 3-RPS parallel manipulator, a genetic algorithm is used to optimize the height of the concentrator’s center of mass. Then the ideal trajectory and attitude of each telescopic rod of the 3-RPS parallel manipulators at different times of the day can be obtained with the inverse kinematics. The particle swarm optimization (PSO)-proportional-integral-derivative (PID) controller, which uses PSO algorithm to tune PID parameters, is proposed for solar trajectory tracking of the novel parabolic dish solar concentrator. The visual simulation model of the parabolic dish system is established in Simscape Multibody, and the trajectory tracking control experiment is carried out. The experimental results show that the trajectory tracking error of the novel dish solar tracking platform can be within 2.6 mm by using the PSO-PID controller.

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A novel ultralight dish system based on a three-extensible-rod solar tracker

Cited by 9 publications

References 22 publications

Performance assessment of a dual‐axis solar tracker for concentrator photovoltaic systems

Performance assessment of a dual‐axis solar tracker for concentrator photovoltaic systems

New design of large fully-steerable radio telescope reflector based on homogenized mesh structure

Design, modeling and solar tracking control for a novel parabolic dish solar concentrator

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