Open-loop solar tracking strategy for high concentrating photovoltaic systems using variable tracking frequency

Mi, Zhe; Chen, Jikun; Chen, Nuofu; Bai, Yiming; Fu, Rui; Hu, Liu

doi:10.1016/j.enconman.2016.03.009

Cited by 52 publications

(18 citation statements)

References 27 publications

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“…Moreover, real-time implementation of the solar positioning system accurately is difficult due to the calibration required for the smooth operation of the system. The open-loop ones have no sensors either but use a microprocessor and are based on the sun position algorithm using a mathematical formula to obtain the station of the sun at a particular location and time, and it does not need to sense any physical quantity [22][23][24]. The third kind of trackers uses the information of electrooptic sensors [25][26][27][28][29] (auxiliary bifacial solar cell panel, charge-coupled device (CCD) camera, photocell, light-dependent resistors, etc.).…”

Section: Introductionmentioning

confidence: 99%

A Low-Cost Closed-Loop Solar Tracking System Based on the Sun Position Algorithm

et al. 2019

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Sun position and the optimum inclination of a solar panel to the sun vary over time throughout the day. A simple but accurate solar position measurement system is essential for maximizing the output power from a solar panel in order to increase the panel efficiency while minimizing the system cost. Solar position can be measured either by a sensor (active/passive) or through the sun position monitoring algorithm. Sensor-based sun position measuring systems fail to measure the solar position in a cloudy or intermittent day, and they require precise installation and periodic calibrations. In contrast, the sun position algorithms use mathematical formula or astronomical data to obtain the station of the sun at a particular geographical location and time. A standalone low-cost but high-precision dual-axis closed-loop sun-tracking system using the sun position algorithm was implemented in an 8-bit microcontroller platform. The Astronomical Almanac’s (AA) algorithm was used for its simplicity, reliability, and fast computation capability of the solar position. Results revealed that incorporation of the sun position algorithm into a solar tracking system helps in outperforming the fixed system and optical tracking system by 13.9% and 2.1%, respectively. In summary, even for a small-scale solar tracking system, the algorithm-based closed-loop dual-axis tracking system can increase overall system efficiency.

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Section: Introductionmentioning

confidence: 99%

A Low-Cost Closed-Loop Solar Tracking System Based on the Sun Position Algorithm

et al. 2019

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“…Usually, the nowadays active tracking systems are based on planar or spatial linkages, gear mechanisms, chain or belt transmissions. The orientation of the photovoltaic panels with active solar trackers may increase the efficiency of the conversion system from 20% up to 50% [1,5,9,11,26].…”

Section: Pv Tracking Systemsmentioning

confidence: 99%

“…For the tracking systems based on the scheme b.1, there are two independent motions (daily motion and seasonal motion), and this because the main (daily) motion is made by rotating the panel around the polar axis. At the same time, there are tracking systems that realize the daily motion by rotating the panel around a vertical axis -azimuthal orientation (b.2); in this case, it is necessary to continuously combine the vertical rotation with an elevation motion around the horizontal axis, the corellation between motions increasing the complexity of the control process [26]. In practice there are two solutions for developing the PV tracked arrays: I. PV platforms, where the panels are mounted on a common frame (panels with same sustaining structure), orientation being realized simultaneously by the orientation of the entire platform; II.…”

Section: Pv Tracking Systemsmentioning

confidence: 99%

A Review on the Sun Tracking Mechanisms for Pv Strings

Alexandru¹

2019

JRISS

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This paper deals with a review on the solar trackers used for increasing the energetic efficiency of the photovoltaic (PV) strings. To begin with, the context from which the utility of the tracking mechanisms emerges is presented. The study continues with the systematization of the PV systems according to the structure that is oriented (i.e. the configuration in which the PV panels are disposed / arranged), presenting also the main advantages and disadvantages of the existing structures. Thus, it is retained as a solution for deepening the research that of the simultaneous orientation of the PV panels arranged in a string-like configuration. Afterwards, the study is focused on the main components that are taken into account in the design process of the tracking systems for PV strings, such as the tracking mode, the evaluation of the solar energy potential (involving the modelling of the solar radiation), the emplacement/disposing scheme of the panels in different array configurations, the mechanical and control devices of the solar trackers.

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“…According to the relative movements in the Sun-Earth astronomical system, two groups of solar trackers can be defined: mono-axial (which are used to adjust the daily or altitudinal position of the PV module), and biaxial (which are able to adjust the both daily and elevation angles, thus assuring a more accurate orientation of the PV module). The solar trackers are actuated by linear or rotary actuators, which are controlled through various strategies, based on use of predefined tracking algorithms (open-loop control) or photo-sensors (closed-loop) [4][5][6].…”

Section: Introductionmentioning

confidence: 99%

Innovative bi-axial tracking mechanism for PV modules

Alexandru¹

2024

RE&PQJ

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The paper deals with an innovative bi-axial tracking mechanism for a group of photovoltaic (PV) modules, which combines the features of the classical platform and string configurations. For the daily movement (corresponding to the primary axis), the sun tracking is performed as in the case of a PV platform, while the elevation movement (around the secondary axis, which is referenced to the primary one) is transmitted similar to the case of a string of PV modules. The sun tracking is conducted by an open-loop control strategy, based on a predefined step-by-step algorithm, which was designed so that to capture as much as possible incident solar radiation with a minimum energy consumption for achieving the orientation. The modeling, simulation and optimization of the solar tracker is performed by using the virtual prototyping package ADAMS.

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Open-loop solar tracking strategy for high concentrating photovoltaic systems using variable tracking frequency

Cited by 52 publications

References 27 publications

A Low-Cost Closed-Loop Solar Tracking System Based on the Sun Position Algorithm

A Low-Cost Closed-Loop Solar Tracking System Based on the Sun Position Algorithm

A Review on the Sun Tracking Mechanisms for Pv Strings

Innovative bi-axial tracking mechanism for PV modules

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