Optimization method of field focusing strategy for heliostats in tower solar thermal power plant

Abstract

The invention discloses a method for optimizing a heliostat field focusing strategy of a tower-type solar thermal power station. In this method, the relationship between the heliostat and the focal point is used as the decision variable to maximize the total energy on the receiver, and the variance of the energy distribution on the receiver is used as a constraint to establish a nonlinear integer programming problem for heliostat focusing. Then, a fast solution method is adopted to select some heliostats with large overflow loss, pre-calculate the imaging distribution when it focuses on different target points, and relax the energy distribution variance constraint to the sampling point energy density difference constraint, and establish a linear Integer programming subproblem. Finally, gradually increase the number of heliostats to be scheduled, and solve a series of the above sub-problems until the energy distribution variance constraints are met. The method of the present invention can maximize the total energy obtained on the receiver and evenly distribute it in the real-time scheduling of the mirror field of the tower-type solar thermal power station, improve the power generation efficiency and ensure the safe operation of the equipment, and solve the problem quickly to meet the real-time control requirements.

Description

Technical field[0001]The present invention relates to the field of tower solar thermal power plants, and more particularly to a tower solar thermal power station setting day mirror field focus strategy optimization method.Background technique[0002]The tower solar thermal power station is a large-scale concentrating power generation device, mainly composed of fixed day mirrors, receiving tower, receiver, heat exchange device, heat storage device, and thermal power generation device, and its working principle is by a certain amount of Dingjing mirror gather solar light to the receiver of the top of the column to produce a high temperature, and the heat flow is directly generated in the receiver, or the heat transfer medium is transferred to water vapor through the heat transfer medium, and push the steam turbine. . Since there is a large concentration ratio (generally up to 300 to 1500), the operating temperature (can be 500 ° C ~ 1500 ° C), the tower solar thermoelectric system is cu...

AI Technical Summary

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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