CN-122020750-A - Tower type photo-thermal mirror field arrangement method adaptive to complex terrain

CN122020750ACN 122020750 ACN122020750 ACN 122020750ACN-122020750-A

Abstract

The invention relates to the field of photo-thermal mirror field arrangement and discloses a self-adaptive complex terrain tower type photo-thermal mirror field arrangement method which comprises the steps of obtaining digital elevation model data of an area to be arranged, taking the central position of a heat absorption tower as a reference, extracting a contour line group based on the height of the tower, calculating the average horizontal distance from each contour line to the heat absorption tower as the arrangement radius of a follow-up heliostat ring, constructing a terrain availability weight function, combining local gradient and surface normal inclination angle to obtain the actual heliostat number adapting to the terrain characteristics, calculating non-uniform azimuth offset angles on each ring according to different angle intervals, calculating azimuth angles and plane coordinates of each heliostat on each ring, and finally generating a terrain self-adaptive mirror field arrangement scheme. The method disclosed by the invention can improve the adaptability and construction feasibility of the lens field in complex terrains, improve the overall optical efficiency and the light-gathering and heat-collecting capacity of the lens field, and reduce the construction and operation costs.

Inventors

LI TAO
WEI YUAN
JIANG YU
WANG DONGXIANG
HAN ZHAOHUI
XIE YU

Assignees

山东电力建设第三工程有限公司

Dates

Publication Date: 20260512
Application Date: 20260114

Claims (9)

1. A self-adaptive complex terrain tower type photo-thermal mirror field arrangement method is characterized by comprising the following steps: firstly, acquiring digital elevation model data of an area to be arranged, extracting a contour line group based on tower height by taking the central position of a heat absorption tower as a reference, and calculating the average horizontal distance from each contour line to the heat absorption tower as the arrangement radius of a follow-up heliostat ring; Step two, constructing a terrain availability weight function based on the contour line family and the corresponding radius thereof, and dynamically adjusting the number of theoretical heliostats on each ring by combining the local gradient and the normal inclination angle of the ground surface to obtain the actual number of heliostats adapting to the terrain characteristics; calculating non-uniform azimuth offset angles on each ring according to the terrain gradient information and the annual average solar incidence leading direction and aiming at different angle intervals so as to realize shadow shielding optimization along the slope; And step four, calculating azimuth angles and plane coordinates of the heliostats on each ring based on the adjusted actual heliostat number and the non-uniform azimuth offset angle, and finally generating a mirror field layout scheme adaptive to the terrain.
2. The method for arranging the tower type photo-thermal mirror field adaptive to complex terrains according to claim 1, wherein the contour family is defined as: ; Wherein, the Is a group of contour lines, which are arranged in a group of contour lines, The number of the contour line group is given, ; Is the tower height of the heat absorption tower; For the elevation difference of adjacent contour lines, Representation points The corresponding elevation is provided with a plurality of grooves, The elevations corresponding to all points in the inner part are the same, namely the contour line groups.
3. The method for arranging the tower type photo-thermal mirror field adaptive to complex terrain as claimed in claim 1, wherein the contour family is characterized in that Average horizontal distance to absorber tower The calculation is as follows: ; Wherein, the , Is that In the presence of an element of the group, Is the coordinate of the central tower height of the heat absorption tower.
4. A tower photo-thermal field arrangement method for adapting to complex terrain according to claim 1, wherein the terrain availability weight function is defined as follows: ; Wherein, the As a function of the terrain availability weights, Is that The corresponding local gradient of the slope is determined, Is the maximum allowable gradient of the vehicle, Is that The corresponding normal inclination angle of the earth surface, Representing a representative function.
5. The method for arranging a tower type photo-thermal mirror field adapting to complex terrains according to claim 1, wherein the actual heliostat number of the kth ring is: ; Wherein, the For the actual number of heliostats of the kth ring, Is a contour line group Is provided for the length of (a), As a function of the terrain availability weights, The number of heliostats on the kth ring is staggered for a standard ring.
6. The method for arranging the tower type photo-thermal mirror field adaptive to complex terrains according to claim 5, wherein, The calculation formula is as follows: ; Wherein, the Is the innermost ring radius when in standard annular staggered arrangement, The ring spacing is the standard annular staggered arrangement; the minimum distance between the centers of adjacent heliostats on the kth ring is as follows: ; Wherein, the For the heliostat width, In order to provide a safety factor against the collision, To prevent the remote ring from adjusting the coefficients too closely, For the radius of the kth ring, , Is a contour line group Average horizontal distance to the absorber tower.
7. The method for arranging the tower type photo-thermal mirror field adaptive to complex terrains according to claim 1, wherein a calculation formula of the non-uniform azimuth offset angle is as follows: ; Wherein, the For a non-uniform azimuth offset angle, Based on the equal dividing angle , The number of heliostats on the kth ring is staggered for a standard ring, For adjusting the coefficient, the method is used for controlling the influence intensity of the terrain on the offset; is the unit vector of the dominant direction of annual average solar incidence, Based on the equal dividing angle The gradient of the corresponding elevation is that of the height, Representation points Corresponding elevation.
8. A method for arranging a tower photo-thermal field adapted to complex terrain according to claim 1, wherein the azimuth angle of the ith heliostat on the kth ring The calculation is as follows: ; ; Wherein, the Based on the equal angle, i.e. the first Ring average division into The ith heliostat is positioned at the (i-1) th sub-point; for the actual number of heliostats of the kth ring, Is a terrain self-adaptive offset angle.
9. The method for arranging the tower type photo-thermal mirror field adaptive to complex terrain according to claim 1, wherein the method is characterized in that Coordinates of the ith heliostat on the ring The following are provided: ; ; Wherein, the For the radius of the kth ring, Is the azimuth angle of the ith heliostat on the kth ring.

Description

Tower type photo-thermal mirror field arrangement method adaptive to complex terrain Technical Field The invention relates to the field of photo-thermal mirror field arrangement, in particular to a tower type photo-thermal mirror field arrangement method adaptive to complex terrains. Background The tower type solar photo-thermal power generation is a technology for reflecting and focusing solar radiation to a heat absorber at the top of a central heat absorption tower through a large number of heliostats, heating a heat transfer medium (such as molten salt), and generating steam by using a high-temperature medium to drive a steam turbine to generate power. One of its core subsystems is the mirror field, i.e. a reflective array of thousands of heliostats that can biaxially track the sun. The lens field arrangement directly determines the optical efficiency, the land utilization rate and the investment cost of the system, so that the lens field arrangement is a key link of the design of the tower type photo-thermal power station. Among the many field layout methods, the annular staggered arrangement is widely used, as shown in fig. 1. The design objective is to maximize the energy contribution of the whole lens field to the heat absorber under the condition of meeting multiple constraints such as optical efficiency, land utilization rate and economy. The method takes a heat absorption tower as a center, heliostats are arranged in layers according to concentric rings, the mirrors in each ring are uniformly distributed along the circumference, and angle offset (such as half-angle spacing or phase difference determined based on an optimization algorithm) is introduced between adjacent rings to form a staggered structure. The design effectively breaks the alignment of the sight lines of the front ring and the rear ring, obviously reduces the shadow and shielding loss when the solar altitude angle is low, and simultaneously adopts the non-uniform ring spacing with dense inside and sparse outside, and combines the optical performance and the economical efficiency. The overall layout has the advantages of approximate rotational symmetry and engineering modularization, is convenient for construction, transportation and stage expansion, can be locally adjusted according to the topography or solar track, for example, the southbound sector is strengthened in a high latitude area, thereby realizing higher annual average optical efficiency and energy collection density on a limited land, and can be locally optimized in combination with topography or latitude, thus being a mainstream efficient mirror field arrangement scheme of the current hundred megawatt tower type photo-thermal power station. In summary, the annular staggered arrangement is an advanced heliostat field layout strategy that compromises optical performance, engineering feasibility and economy. The tower type photo-thermal power station realizes higher energy collection efficiency on limited land through ingenious dislocation in geometry, and is one of the mainstream design directions of the current tower type photo-thermal power station. However, many photo-thermal projects are in high altitude areas at present, the topography fluctuation is large, and land leveling is impossible for the purposes of construction difficulty, engineering quantity, economy, environmental protection and the like. The traditional annular staggered layout assumes that the ground is a plane, but on sloping fields such as a back-and-shade slope, a steep slope, a ridge lee surface and the like, the actual elevation difference corresponding to the arrangement of the mirror fields of the same circular ring can reach tens of meters, so that the foundation cost is greatly increased due to the fact that part of heliostat mirrors are suspended or deeply buried, the effective sun tracking cannot be performed due to the fact that the view of a heat absorber is blocked by local mountain bodies, and the optical efficiency is extremely low due to the fact that serious shadow blocking exists among heliostats. Disclosure of Invention In order to solve the technical problems, the invention provides a self-adaptive tower type photo-thermal mirror field arrangement method for complex terrains, so as to achieve the purposes of improving the adaptability and construction feasibility of the mirror field in the complex terrains, improving the overall optical efficiency and energy collection capacity of the mirror field and reducing the construction and operation costs. In order to achieve the above purpose, the technical scheme of the invention is as follows: a self-adaptive complex terrain tower type photo-thermal mirror field arrangement method comprises the following steps: firstly, acquiring digital elevation model data of an area to be arranged, extracting a contour line group based on tower height by taking the central position of a heat absorption tower as a reference, and calculating the avera