Methods and systems for determining obstruction setbacks in a photovoltaic system

• US 10,331,805 B2
• Filed: 11/25/2014
• Issued: 06/25/2019
• Est. Priority Date: 11/17/2014
• Status: Active Grant

• Current Assignee: FTC Solar, Inc.
• Original Assignee: FTC Solar, Inc.
• Inventors: Morse, Andrew Joseph, Cherukupalli, Nagendra Srinivas, Ranganathan, Ravi, Ramagopal, Krishnan
• Primary Examiner(s): Tat, Binh C
• Application Number:
  US14/553,574
• Publication Number:
  US 20160140282A1
• Time in Patent Office: 1,673 Days
• Field of Search: 716100-125
• CPC Class Codes: G06F 30/13 Architectural design, e.g. computer-aided architectural design [CAAD] related to design of buildings, bridges, landscapes, production plants or roads
• CPC Class Codes: G06F 30/20 Design optimisation, verification or simulation optimisation, verification or simulation of circuit designs G06F30/30
• CPC Class Codes: G06F 30/398 Design verification or optimisation, e.g. using design rule check [DRC], layout versus schematics [LVS] or finite element methods [FEM] optical proximity correction [OPC] design processes G03F1/36
• CPC Class Codes: G06Q 10/04 Forecasting or optimisation specially adapted for administrative or management purposes, e.g. linear programming or "cutting stock problem" market predictions or forecasting for commercial activities G06Q30/0202
• CPC Class Codes: G06Q 50/06 Energy or water supply

Abstract

A computer-implemented method for determining boundary offsets in a photovoltaic (PV) system based on shadow simulations is implemented by a design automation computer system in communication with a memory. The method includes identifying a set of obstructions wherein the set of obstructions includes a set of obstruction elevations and a set of obstruction offsets, simulating a set of shadow effects using a first coarse shadow algorithm based on the set of obstructions, refining the set of shadow effects using a second fine shadow algorithm based on the set of obstructions and the set of shadow effects, and defining a plurality of boundary of boundary offsets based on the refined set of shadow effects.

Claims

1. An improved automated computer-implemented method for determining obstruction setbacks in a photovoltaic (PV) system based on shadow simulations, the method implemented by a design automation computer system including a processor in communication with a visual display and a memory including a component library data structure and a plurality of algorithms, the method comprising:

identifying a set of non-PV system obstructions located at a geographic site, wherein the set of obstructions includes a set of obstruction elevations and a set of obstruction dimensions;

determining a position of the sun relative to the geographic site for each time interval of a plurality of time intervals;

determining a subset of the set of obstructions located at the geographic site, the subset of obstructions including only the obstructions in the set of obstructions that extend above a table height associated with the PV system;

generating a simplified representation of at least one obstruction, wherein the simplified representation includes a reduced number of corners than at least one obstruction of the set of obstructions;

simulating, for each time interval of the plurality of time intervals, a set of shadow effects using a first coarse shadow algorithm and the simplified representation, the first coarse shadow algorithm using a first approach by determining, for each time interval, at least one vector from a position of the sun during the time interval to each obstruction in the subset of obstructions to define a shadow effect based on a projection along the at least one vector onto a surface of the geographic location;

refining the set of shadow effects using a second fine shadow algorithm that uses a second approach different than the first approach to improve an accuracy of the design automation computer system, wherein the second fine shadow algorithm divides each shadow effect of the set of shadow effects into a plurality of sections and performs a reverse ray analysis on each section for each time interval, the size of the sections is limited to a maximum size to maintain accuracy, the size of the sections is limited to a minimum size to maintain an efficiency of the calculation;

defining a plurality of obstruction setbacks based on the refined set of shadow effects; and

displaying, on the visual display, a representation of at least a portion of the PV system built using the component library data structure and the plurality of algorithms, and at least one of the refined set of shadow effects and the defined plurality of obstruction setbacks on a visual display.

2. The improved automated method of claim 1, further comprising:

simulating the set of shadow effects for a plurality of solstice periods.

3. The improved automated method of claim 1, further comprising:

identifying the table height associated with the PV system.

4. The improved automated method of claim 1, further comprising:

identifying at least one of obstruction in the subset of obstructions as including a number of corners sufficient to increase a length of time required to simulate the set of shadow effects using the first coarse shadow algorithm beyond a preset length of time.

5. The improved automated method of claim 1, wherein performing the reverse ray analysis for each time interval further comprises:

identifying a central point in each section of the plurality of sections;

projecting a line from each central point to the position of the sun during the time interval; and

determining whether each line intersects with at least one obstruction of the subset of obstructions.

6. The improved automated method of claim 1, wherein the first coarse shadow algorithm:

determines, for each time interval, a vector from the position of the sun during the time interval to each corner of each obstruction in the subset of obstructions to determine a projection of each corner along the vector onto a surface of the geographic location; and

connects the projection of each corner of an obstruction to determine the shadow effect of the obstruction.

7. The improved automated method of claim 6, further comprising combining overlapping shadow effects using a union algorithm.

8. An improved automated design automation computer system used for determining obstruction setbacks in a photovoltaic (PV) system based on shadow simulations, the design automation computer system comprising:

a processor;

a visual display communicatively coupled to said processor; and

a memory including a component library data structure and a plurality of algorithms and communicatively coupled to said processor, said processor configured to;

identify a set of non-PV system obstructions located at a geographic site, wherein the set of obstructions includes a set of obstruction elevations and a set of obstruction dimensions;

determine a position of the sun relative to the geographic site for each time interval of a plurality of time intervals;

determine a subset of the set of obstructions located at the geographic site, the subset of obstructions including only the obstructions in the set of obstructions that extend above a table height associated with the PV system;

generate a simplified representation of at least one obstruction, wherein the simplified representation includes a reduced number of corners than at least one obstruction of the set of obstructions;

simulate, for each time interval of the plurality of time intervals, a set of shadow effects using a first coarse shadow algorithm and the simplified representation, the first coarse shadow algorithm determining using a first approach, for each time interval, at least one vector from a position of the sun during the time interval to each obstruction in the subset of obstructions to define a shadow effect based on a projection along the at least one vector onto a surface of the geographic location;

improve an accuracy of the design automation computer system by refining the set of shadow effects using a second fine shadow algorithm that uses a second approach different than the first approach to improve an accuracy of the design automation computer system, wherein the second fine shadow algorithm divides each shadow effect of the set of shadow effects into a plurality of sections and performs a reverse ray analysis on each section for each time interval, the size of the sections is limited to a maximum size to maintain accuracy, the size of the sections is limited to a minimum size to maintain an efficiency of the calculation; and

define a plurality of obstruction setbacks based on the refined set of shadow effects; and

display at least a portion of a representation of the PV system using the component library data structure, the plurality of algorithms, and at least one of the refined set of shadow effects and the defined plurality of obstruction setbacks on a visual display.

9. The improved automated design automation computer system of claim 8, further configured to:

simulate the set of shadow effects for a plurality of dates including a solstice period.

10. The improved automated design automation computer system of claim 8, further configured to:

identify the table height associated with the PV system.

11. The improved automated design automation computer system of claim 8, further configured to:

identify at least one of obstruction in the subset of obstructions as including a number of corners sufficient to increase a length of time required to simulate the set of shadow effects using the first coarse shadow algorithm beyond a preset length of time.

12. The improved automated design automation computer system of claim 8, further configured to:

identify a central point in each section of the plurality of sections;

project a line from each central point to the position of the sun during the time interval; and

determine whether each line intersects with at least one obstruction of the subset of obstructions.

13. The improved automated design automation computer system of claim 8, wherein the first coarse shadow algorithm:

determines, for each time interval, a vector from the position of the sun during the time interval to each corner of each obstruction in the subset of obstructions to determine a projection of each corner along the vector onto a surface of the geographic location; and

connects the projection of each corner of an obstruction to determine the shadow effect of the obstruction.

14. The improved automated method of claim 13, further configured to combine overlapping shadow effects using a union algorithm.

15. Computer-readable storage media for determining obstruction setbacks in a photovoltaic (PV) system based on shadow simulations, the computer-readable storage media having computer-executable instructions embodied thereon, wherein, when executed by a design automation computer system including a visual display, a memory including a component library data structure and a plurality of algorithms, and at least one processor, the computer-executable instructions cause the processor to:

identify a set of non-PV system obstructions located at a geographic site, wherein the set of obstructions includes a set of obstruction elevations and a set of obstruction dimensions;

determine a position of the sun relative to the geographic site for each time interval of a plurality of time intervals;

determine a subset of the set of obstructions located at the geographic site, the subset of obstructions including only the obstructions in the set of obstructions that extend above a table height associated with the PV system;

generate a simplified representation of at least one obstruction, wherein the simplified representation includes a reduced number of corners than at least one obstruction of the set of obstructions;

simulate, for each time interval of the plurality of time intervals, a set of shadow effects using a first coarse shadow algorithm and the simplified representation using a first approach, the first coarse shadow algorithm determining, for each time interval, at least one vector from a position of the sun during the time interval to each obstruction in the subset of obstructions to define a shadow effect based on a projection along the at least one vector onto a surface of the geographic location;

improve an accuracy of the design automation computer system by refining the set of shadow effects using a second fine shadow algorithm that uses a second approach different than the first approach to improve an accuracy of the design automation computer system, wherein the second fine shadow algorithm divides each shadow effect of the set of shadow effects into a plurality of sections and performs a reverse ray analysis on each section for each time interval, the size of the sections is limited to a maximum size to maintain accuracy, the size of the sections is limited to a minimum size to maintain an efficiency of the calculation;

define a plurality of obstruction setbacks based on the refined set of shadow effects; and

display a representation of at least a portion of the PV system using the component library data structure, the plurality of algorithms, and at least one of the refined set of shadow effects and the defined plurality of obstruction setbacks on a visual display.

16. The computer-readable storage media in accordance with claim 15, wherein the computer-executable instructions cause the processor to:

simulate the set of shadow effects for a plurality of time periods.

17. The computer-readable storage media in accordance with claim 15, wherein the computer-executable instructions cause the processor to:

identify the table height associated with the PV system.

18. The computer-readable storage media in accordance with claim 15, wherein the computer-executable instructions cause the processor to:

identify at least one of obstruction in the subset of obstructions as including a number of corners sufficient to increase a length of time required to simulate the set of shadow effects using the first coarse shadow algorithm beyond a preset length of time.

19. The computer-readable storage media in accordance with claim 15, wherein the computer-executable instructions cause the processor to:

identify a central point in each section of the plurality of sections;

project a line from each central point to the position of the sun during the time interval; and

determine whether each line intersects with at least one obstruction of the subset of obstructions.

20. The computer-readable storage media in accordance with claim 15, wherein the computer-executable instructions cause the processor to:

determine, for each time interval, a vector from the position of the sun during the time interval to each corner of each obstruction in the subset of obstructions to determine a projection of each corner along the vector onto a surface of the geographic location; and

connect the projection of each corner of an obstruction to determine the shadow effect of the obstruction.

21. The computer-readable storage media in accordance with claim 20, wherein the computer-executable instructions cause the processor to combine overlapping shadow effects using a union algorithm.