A Novel Open‐Loop Tracking Strategy for Photovoltaic Systems

Alexandru, Cătălin

doi:10.1155/2013/205396

Cited by 41 publications

(32 citation statements)

References 22 publications

(19 reference statements)

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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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“…The solar tracker has two axis of rotation which enable it to rotate along the eastwest and northsouth axis. The type of Dual-Axis Tracking System that is used in this research falls into the category of equatorial as categorized by Alexandru [26]. The DAST proposed here is able to track the sun on two independent axes.…”

Section: Methodsmentioning

confidence: 99%

Performance of Dual-Axis Solar Tracker versus Static Solar System by Segmented Clearness Index in Malaysia

Lee

Rahim

Al‐Turki

2013

International Journal of Photoenergy

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The performance of Dual-Axis Solar Tracker (DAST) and Static Solar System (SSS) with respect to clearness index in Malaysia is presented. An attempt to investigate the correlation between clearness index with energy gain and efficiency of DAST over SSS is being done experimentally. A good correlation could not be found out from the daily clearness index. It is due to the more profound advantage of DAST in the morning and evening compared to midday as it is able to follow the sun’s position. Hence, the daily clearness index is divided into three segments which are morning, midday, and evening to interpret the energy gain and efficiency better. A clearer correlation with low standard deviation can be observed on the segmented clearness index analysis. The energy gain and efficiency of seven cities in Malaysia is being estimated with the segmented clearness index and compared to the result generated from anisotropic radiation model. A similar trend is obtained and it has shown that the segmented clearness index could be utilized as a graphical method for estimation of energy gain and efficiency of DAST over SSS.

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“…The worm gear ensures both movement irreversibility and amplification, thus allowing using a low power rotary motor. The PV modules are arranged on their own frames (6), which are connected by bearings (7) to the common platform (3). The elevation movement is transmitted to all the string modules by means of a homokinetic belt transmission (8).…”

Section: The Proposed Designmentioning

confidence: 99%

“…In order to identify the type of mechanism that is most appropriate for the orientation of the string platform, the four basic bi-axial solar trackers (depending on the orientation and relative positioning of the two revolute axes) were considered: polar (equatorial), pseudo-polar(equatorial), azimuthal, and pseudo-azimuthal [7]. Given their functional and constructive characteristics, it was determined that the pseudo-azimuthal mechanism is the most appropriate for the string platform design.…”

Section: Introductionmentioning

confidence: 99%

Innovative bi-axial tracking mechanism for PV modules

Alexandru¹

2020

REPQJ

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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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A Novel Open‐Loop Tracking Strategy for Photovoltaic Systems

Cited by 41 publications

References 22 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

Performance of Dual-Axis Solar Tracker versus Static Solar System by Segmented Clearness Index in Malaysia

Innovative bi-axial tracking mechanism for PV modules

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