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DESIGN OF AN EAST-WEST ONE-AXIS SOLAR TRACKING SYSTEM BASED ON A LINEAR MOTOR

IP.com Disclosure Number: IPCOM000236219D
Publication Date: 2014-Apr-12
Document File: 9 page(s) / 664K

Publishing Venue

The IP.com Prior Art Database

Abstract

The invention proposes a technique to design an east-west one axis solar tracking system based on linear motor. The technique provides a design of an east-west one-axis solar tracking based on maintaining azimuth of photovoltaic (PV) modules constant. The technique only changes inclination angle of the modules by moving a linear motor. A rack consists of several PV modules connected in series, string and several strings in parallel. In the early morning, the rack faces east, while in noon hours, the system will be is placed in horizontal position with tilted angle zero. In the afternoon, the rack faces towards west. To enable the tracking, the rack is articulated in the middle. The extremes of the rack are equipped with a kind of gear wheel confined inside a rail which enables linear movement in the east-west direction.

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DESIGN OF AN EAST-WEST ONE-AXIS SOLAR TRACKING SYSTEM BASED ON A LINEAR MOTOR

BRIEF ABSTRACT

The invention proposes a technique to design an east-west one axis solar tracking system based on linear motor. The technique provides a design of an east-west one-axis solar tracking based on maintaining azimuth of photovoltaic (PV) modules constant. The technique only changes inclination angle of the modules by moving a linear motor. A rack consists of several PV modules connected in series, string and several strings in parallel. In the early morning, the rack faces east, while in noon hours, the system will be is placed in horizontal position with tilted angle zero. In the afternoon, the rack faces towards west. To enable the tracking, the rack is articulated in the middle. The extremes of the rack are equipped with a kind of gear wheel confined inside a rail which enables linear movement in the east-west direction.

KEYWORDS

East-west, solar tracking system, linear motor, azimuth, inclination angle, gear wheel, row-to-row shadows

DETAILED DESCRIPTION

In general, photovoltaic systems in utility scale range installed in an open field are mounted at a fixed inclination and faces towards south, so that energy yield is maximized for a specific location. However, energy yield values are still far away from the maximum that the photovoltaic system reaches while installed on earth.

In a conventional technique, maximum energy is reached by installing a two axes tracking system which tracks altitude of sun and azimuth. Therefore, photovoltaic system is positioned perpendicular to direct beam. However, the technique requires mainly high land area to avoid undesired shadows and high investment and operating and management (O&M) costs. Other tracking systems with one-axis movement, for example, east-west trackers, have become more cost effective and popular. As a result, such tracking system achieves energy yields which are between values of two-axis tracking system and fixed systems. However, overall costs of electric drive train with rotating parts and its operation and maintenance costs are high to be deployed in a broader geographical area.

FIGURE 1 depicts fixed titled installation and installation with two axis tracking systems.

Another conventional technique relates to a simplified and gravity centered tracker structure with low cost single or dual actuators mounted on the side of post which is easier for replacements and maintenance at low cost.

Yet another conventional technique offers a support structure for a platform carrying solar panels such that the platform is oriented towards the sun and movement is smooth, simple and efficient.

However, the overall cost of the above mentioned techniques is very high and yield energy is low.

Therefore, there is a need in the art for a technique to reduce operation and maintenance cost.

The invention proposes a technique to design an east-west one axis solar tracking system based on linear motor. The technique...