Dual-Mode PV Power Conditioning for Mismatch in Solar Strings
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Solution Overview
Problem
Solar power conversion systems face inefficiencies due to non-uniformity among panels, partial shading, dirt accumulation, panel damage, and degradation over time, leading to reduced energy harvesting and high costs, particularly when weak panels in series connections limit the overall output.
Innovation Solution
The implementation of a power conditioner system with individual maximum power point tracking (MPP) circuits for each panel, allowing each panel to operate at its maximum power point, and the use of dual mode photovoltaic converters to adjust impedance and voltage, enabling high-efficiency energy harvesting and voltage transformation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If solar panels are connected in series to provide high voltage, then electrical interconnect losses are reduced, but the lowest power panel limits the current through every other panel
Solution Approach 1:
The system segments the solar panel array into individually controllable units by placing a power conditioner with MPP tracking circuitry at each panel level. This allows each panel to operate independently at its maximum power point, preventing the weakest panel from limiting the overall system output while maintaining series connection for high voltage operation.
2Ease of operation
If conventional power converters are used to convert solar power, then electrical power can be made usable, but conversion efficiencies are limited and Balance of System costs are high
Solution Approach 1:
The power conditioner incorporates maximum power point tracking (MPP) circuitry that continuously monitors panel output and adjusts the conversion process in real-time. This feedback mechanism enables the system to dynamically optimize conversion efficiency by maintaining operation at the maximum power point under varying environmental conditions, achieving efficiencies above 98%.
3Duration of action of moving object
If solar panels are subjected to environmental factors like shading and dirt, then power generation continues, but non-uniformity among panels reduces overall system performance
Solution Approach 1:
The system applies local quality control by implementing individual power conditioning and MPP tracking at each panel level. This allows each panel to independently compensate for local degradation factors such as shading or dirt accumulation, ensuring that performance variations in one panel do not propagate to limit the output of other panels in the series connection.
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 approach increases total energy harvesting by up to 20% and simplifies the grid-tied inverter, reducing Balance of System costs while achieving efficiencies above 98% and minimizing energy losses.
Implementation Method 1
These devices create a photovoltaic DC current through the photovoltaic effect
Data Source
AI summary
Different systems to achieve solar power conversion are provided in at least three different general aspects, with circuitry that can be used to harvest maximum power from a solar source (1) or strings of panels (11) for DC or AC use, perhaps for transfer to a power grid (10) three aspects can exist perhaps independently and relate to: 1) electrical power conversion in a multimodal manner, 2) alternating between differing processes such as by an alternative mode photovoltaic power converter functionality control (27), and 3) systems that can achieve efficiencies in conversion that are extraordinarily high compared to traditional through substantially power isomorphic photovoltaic DC-DC power conversion capability that can achieve 99.2% efficiency or even only wire transmission losses. Switchmode impedance conversion circuits may have pairs of photovoltaic power series switch elements (24) and pairs of photovoltaic power shunt switch elements (25).