Understanding Tracking Photovoltaic Systems
Release time:
2023-08-18
Source:
Internet
There are four widely used solar photovoltaic automatic tracking systems, including horizontal single-axis tracking, double-column inclined single-axis tracking, vertical single-axis tracking and dual-axis tracking. Among them, horizontal single-axis tracking and inclined single-axis tracking, vertical single-axis tracking have only one rotation. Degree of freedom, dual-axis tracking has two rotational degrees of freedom.
The tracking control strategy used by the three tracking systems is an active tracking control strategy, which calculates the sun's position in the sky and controls the orientation of the photovoltaic array. This kind of active photovoltaic automatic tracking system can be better applied to the environment of more frost, snow and dust, and can work reliably in the unattended photovoltaic power station. From the point of view of whether the tracking is continuous or not, the photovoltaic automatic tracking system developed adopts the step tracking mode, which can greatly reduce the energy consumption of the tracking system compared with the continuous tracking mode.
A well-designed photovoltaic tracking system can increase the efficiency of the entire system by 40%, while the power consumption of the motor itself is only 20kwh a year, and the cost is low and the installation is convenient.
The sensor is installed on the solar cell array and operates synchronously with it. Once the light direction changes slightly, the sensor is out of balance and the system output signal produces deviation. When the deviation reaches a certain amplitude, the sensor outputs the corresponding signal, and the actuator starts to correct the deviation to make the photoelectric sensor reach balance again-that is, the solar cell square array plane controlled by the sensor output signal stops rotating when it forms an angle with the light, completing an adjustment cycle.
Such continuous adjustment, time along the sun's trajectory to follow the sun, constitute a closed-circuit feedback system, to achieve automatic tracking. The system does not need to set the reference position, and the sensor will never lose its direction. The system is equipped with anti-stray light interference and night tracking circuit, and with a manual control switch to facilitate debugging.
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