Distributed Inverter Voltage Boosting for Solar Array Efficiency
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Solution Overview
Problem
Large-scale solar array systems require extensive lengths of copper wire to connect combiner boxes to the inverter assembly, leading to significant material costs and energy losses due to current flow.
Innovation Solution
Distributing DC-DC converters throughout the solar array at combiner boxes to boost voltage locally, reducing the need for large gauge wires and enabling more precise maximum power point tracking control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If modules are connected in series to obtain desired voltage and strings are connected in parallel to produce more current, then the system produces higher power output, but the amount of copper wire required to connect combiner boxes to inverter assembly increases significantly
Solution Approach 1:
The patent divides the centralized inverter function into distributed inverter units placed at each combiner box location throughout the solar array. This segmentation allows each unit to handle a portion of the total power conversion, eliminating the need for long-distance wire runs from all combiner boxes to a single centralized inverter, thus reducing total copper wire quantity while maintaining power output.
Solution Approach 2:
The patent transitions from a centralized inverter architecture to a distributed architecture by adding spatial distribution across multiple locations in the array. Instead of all connections converging to one point, the inverter functions are distributed across multiple dimensions of the array layout, reducing wire length requirements.
2Power
If extensive lengths of copper wire are used to connect combiner boxes to inverter assembly, then power delivery is achieved, but energy losses due to current flow increase
Solution Approach 1:
By segmenting the inverter function across multiple distributed units at combiner box locations, the patent reduces the distance current must travel through wire. Each distributed unit converts DC to AC locally, minimizing the length of high-current wire runs and thereby reducing I²R energy losses while maintaining effective power delivery.
Solution Approach 2:
The distributed inverter units perform voltage conversion and power conditioning at the combiner box locations before power is transmitted over long distances. This preliminary action of converting DC to AC closer to the point of generation reduces the energy loss during transmission by minimizing the distance over which high currents flow through resistive wire.
3Device complexity
If a single inverter assembly is used at the terminal point, then system simplicity is maintained, but control precision over changing solar conditions across the array is reduced
Solution Approach 1:
The patent segments the single centralized inverter into multiple distributed inverter units, with each unit serving a specific section of the solar array. This allows each unit to independently track and respond to local solar conditions (irradiance, temperature, shading) with precise maximum power point tracking, improving overall control precision while maintaining manageable system complexity through modular design.
Solution Approach 2:
Each distributed inverter unit is optimized to handle the specific characteristics of its local array section, enabling localized control and optimization. This local quality approach allows precise adaptation to varying solar conditions across different parts of the array, with each unit independently adjusting its operation based on local environmental factors.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This configuration reduces wire gauge requirements, minimizes energy losses, and allows for cost savings by using smaller wires, while providing granular control over changing solar conditions across the array.
Implementation Method 1
The cells convert solar energy into direct current (DC) electricity via the photovoltaic effect
Implementation Method 2
each combiner box, which connects a set of strings 16, has an associated DC-DC converter 40A, 40B, 40C, 40D that boosts the voltage output of the associated combiner box
Data Source
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AI summary
A power generator configuration having a distributed inverter. A system (11) is described that includes a plurality of solar modules (12) coupled together in series to form a string (16, S2); a plurality of combiner boxes (14A, 14B, 14C, 14D), wherein each combiner box (14A, 14B, 14C, 14D) couples together a plurality of strings (16, S2) in parallel; and a plurality of DC-DC Converters (40A, 40B, 40C, 40D), wherein each DC-DC Converter (40A, 40B, 40C, 40D) increases a direct current (DC) voltage (S4) output of an associated combiner box. Also provided are distributed maximum power point tracker (MPPT) (42A, 42B, 42C, 42D) controls that adjust for changing conditions at individual sets of strings (16, S2).