Method for scheduling heliostat field in tower solar thermal power station

Abstract

The invention discloses a method for scheduling a heliostat field in a tower solar thermal power station. In the method, an open-closed loop combined control mode is adopted; in open loop control, the control direction and position of a heliostat are computed in real time according to the running rule of the sun, the latitude and longitude of the heliostat as well as the geometric relationship between the positions of the heliostat and a heat absorber; and in closed loop control, a target position corresponding to each heliostat is determined through a closed loop sensor, and the heliostat is accurately tracked according to a real-time angle value of the heliostat fed back by the closed loop sensor, so that the energy-flux density of the heliostat field is homogenized and scheduled. According to the method, automatic homogenizing and scheduling of the energy-flux density projection of the heliostat field are realized, and the defects of poor energy-flux density homogenizing effect and unavailable self-correction caused by a large tracking error existing in open loop control are overcome effectively; and moreover, the method is easy to implement and is convenient to operate.

Description

technical field [0001] The invention relates to a heliostat field scheduling method in a tower-type solar thermal power station, in particular to a heliostat field scheduling method adopting open-closed loop combined control. Background technique [0002] The heliostat field is a group of heliostats composed of many heliostats. It is an important part of the tower solar thermal power station. It is used to collect and project low-density solar radiation energy into the heat absorber at a designated location. Thus, together with the heat absorber, the light-to-heat conversion of the tower power station can be realized. [0003] The common tracking control methods of heliostats are divided into three types: open-loop control, closed-loop control and open-closed-loop combined control. At present, the tower-type power stations built abroad basically adopt the open-loop control method. Open-loop control (also called program control) is to calculate the control direction and posi...

AI Technical Summary

Problems solved by technology

[0006] Although the heliostat fields of the above open-loop control methods have established their own scheduling methods, there is no related patent disclosure of the scheduling method for the heliostat fields of the open-closed-loop combined control method

However, the following problems still exist in the above disclosed scheduling methods: there is a large tracking error in the open-loop control of the heliostat, which leads to poor energy-flux density equalization scheduling effect and cannot be corrected by itself; Surface energy flux density distribution, and real-time calculation of the moving azimuth and distance of the heliostat, which may cause new hot spots on the moving path of the light spot or cause misoperation

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