Dual-axis tracking is achieved via astronomical programming. The PLC (programmable logical controller) incorporated into the system controls actuation of the two gear motors and corresponding actuator, which in turn guide the tracker to follow the sun’s trajectory from the rising to the setting. Thus, it attains optimal inclination and orientation with respect to the sun over the course of the whole day, taking maximum advantage of the total daily solar radiation received by the panels.

The direct current from the photovoltaic modules is transformed into alternating current with inverters and then the electric energy is injected into the electric grid. During the hours of sunlight, the photovoltaic installation will produce energy, independent of how much is being consumed, and it will inject all the energy into the electric grid. At night, the installation will automatically disconnect, and it will reconnect the next day.

The performance of the control system lies on two aspects: (1) electrical control parts and driving parts; (2) sensor and error correction system.

With regard to the electrical control parts and driving parts, we select components from leading vendors on corresponding fields especially considering the operation temperature range and circumstances. The operation temperature range is -25℃~55℃.

As to the error correction system, sensors are used for azimuth and elevation tracking to return to the original point and prevent accidents. The system also contains an error correction method for controlling programs such as checking the wind speed.

As an option, we also build up a sensor system to directly monitor the tracker’s operation status in real time, which includes getting the azimuth angle and tilt angle directly. Added to actuation parts, a close-circle is formed. It is different from other trackers. And the tracker’s operation status can be transmitted to the monitoring desk too. Not only monitoring but also remote controlling comes into reliability.