Heliostat tracing controlling apparatus and its control method

Abstract

The invention discloses a heliostat tracking control device, which comprises a main controller and a closed-loop tracking sensor. The main controller comprises a DSP control circuit, a RTC real-time clock, digital signal input and output units, an analog signal input unit, a signal amplifying circuit, a human-computer interface device, a display device, a watchdog circuit, an asynchronous motor, a line of serial port communication interface which carries out the communication with a monitoring computer, and a line of serial port communication interface which carries out the communication with an azimuth angle and altitude angle encoder. The invention further discloses a heliostat tracking control method, the method adopts the open-loop and the closed-loop combined control, the open-loop roughly calculates and adjusts the position of a heliostat and the closed-loop corrects and eliminates the accumulated error till the precise tracking. The heliostat tracking control device has the advantages that the heliostat tracking control device can not have the accumulated error or the failure of the tracking system due to the rainy and cloudy weather. The system adopts the combined control algorithm within the control period, thus achieving the precise tracking of the heliostat. The tracking reaction speed, the power consumption and the cost are low, thus forming a modular structure.

Description

technical field [0001] The invention belongs to the field of high-precision tracking control in solar heat utilization, and in particular relates to a real-time tracking control device and control method for numerous heliostats in a solar tower thermal power station. Background technique [0002] The heliostat is an important part of the tower solar thermal power station. It is used to track and reflect the sun's rays into the collector located on the top of the receiving tower. mechanism and its control system. [0003] At present, most heliostat tracking transmission mechanisms use harmonic mechanisms, and common tracking control systems can be divided into open-loop, closed-loop, and open-closed-loop hybrid control methods according to whether there is feedback from the controlled variable to the controlled variable. The open-loop control is to calculate the control direction of the heliostat by using the law of the sun, the position of the heliostat (latitude and longit...

AI Technical Summary

Problems solved by technology

The open-loop control is to calculate the control direction of the heliostat by using the law of the sun, the position of the heliostat (latitude and longitude), the position of the collector, and the distance relationship with the heliostat. The disadvantage of this type of control is due to the mechanical There will be cumulative errors due to machining accuracy and actuators. The errors are large and need to be corrected regularly. The advantages are low cost and simple control. Closed-loop control uses photoelectric tracking sensors to detect the position of sunlight, thereby controlling the movement of the actuators to achieve accurate aggregation. The effect of solar energy, the advantage of this kind of control is that the control accuracy is high, and the fatal disadvantage is that when it is cloudy or rainy, the photosensitive element cannot receive sunlight for a long time, resulting in the failure of the tracking system, and even the error of the actuator. operate

Images