Heliostat field focusing strategy optimization method for tower type solar thermal power station

Abstract

The invention discloses a heliostat field focusing strategy optimization method for a tower type solar thermal power station. The method comprises the following steps: firstly, maximizing total energyon a receiver by taking a corresponding relationship between a heliostat and a focus point as a decision variable, and establishing a nonlinear integer programming problem of heliostat focusing by taking an energy distribution variance on the receiver as a constraint; then, adopting a rapid solving method, selecting part of heliostats with large overflow losses, pre-calculating imaging distribution of the heliostats focused on different target points, relaxing energy distribution variance constraints into sampling point energy density difference constraints, and establishing linear integer programming sub-problems; and finally, increasing heliostats receiving scheduling step by step, and solving a series of sub-problems until energy distribution variance constraints are met. According tothe method, in the real-time scheduling of the mirror field of the tower type solar thermal power station, the total energy obtained on the receiver is maximum and uniformly distributed, the power generation efficiency is improved, the safe operation of equipment is ensured, the solution is rapid, and the real-time control requirement is met.

Description

technical field [0001] The invention relates to the field of tower-type solar thermal power plants, in particular to a method for optimizing a heliostat field focusing strategy of a tower-type solar thermal power station. Background technique [0002] Tower-type solar thermal power station is a large-scale concentrating power generation device, which is mainly composed of heliostats, receiving towers, receivers, heat exchange devices, heat storage devices and thermal power generation devices. Its working principle is through a certain number of The heliostat gathers sunlight to the receiver on the top of the tower to generate high temperature, and then heats the water flowing through the receiver to directly generate high-temperature steam, or heats the heat transfer medium and then transfers the heat to the water vapor through the heat transfer medium, driving the steam turbine to generate electricity . Due to the advantages of large concentration ratio (generally up to 30...

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Problems solved by technology

In the existing research, the above three aspects are often unable to be considered at the same time. This is because the calculation of the reflection energy distribution of the heliostat is time-consuming, and the number of heliostats in the mirror field is often very large, which leads to the above nonlinear integer programming problem not only the objective function Time-consuming to solve and the problem dimension is large

In order to meet the real-time requirements of mirror field control, the existing methods often perform low-precision approximate calculations in the calculation of heliostat reflection energy, or simplify the objective function to reduce the scale of the problem, so that the solution is often a suboptimal solution. Reduced power generation efficiency of the power station

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