In a solar thermal power generation system, sunlight is concentrated onto a receiver that uses the heat to turn water into steam, which rotates a turbine and generates electricity. By controlling the angle of the heliostat so it tracks the movement of the sun, it is possible to precisely focus the sunlight onto the receiver. For photovoltaic power generation systems, most solar panels used today are of the fixed type. Power generating efficiency can be improved if panels are kept directed at an optimal angle towards the sun. Control technologies that can precisely orient the heliostats and panels to follow the movement of the sun are crucial.
By using its control technologies, Yokogawa has developed the HXS10 to control the actuation systems of solar thermal and photovoltaic power generation systems. Based on the facility location, date, and time, the HXS10 calculates the position of the sun through a 64-bit solar position algorithm, and operates motors or hydraulic actuators to adjust the angle of the heliostats and solar panels so they stay pointed toward the sun.
The HXS10 is designed specifically for the control of solar tracking systems. Compared to general-purpose controllers such as PLCs, this controller has lower initial costs and requires less engineering time.
It can withstand temperatures ranging from 20° C to +70° C. It has a communication function that allows it to be monitored by a host system in a central control room. Moreover, to eliminate communication traffic overload and create a more secure and stable communication environment, each HXS10’s communications can be routed to the host system via another HXS10 unit.
Yokogawa Corporation of America
Filed Under: Energy management + harvesting, Green engineering, Motion control • motor controls