Photovoltaic Module Rectification via Current Injection
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Solution Overview
Problem
Existing photovoltaic module rectification methods can only address potential induced degradation, leaving initial light-induced and material aging degradation unmitigated, resulting in significant power generation capacity loss.
Innovation Solution
A method involving the injection of a rectification current into the positive or negative electrode of a photovoltaic module to react with active centers, increase temperature, and separate alkaline metal ions, thereby rectifying initial light-induced, material aging, and potential induced degradations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If voltage is applied to the frame and positive/negative electrode to form negative bias for rectifying potential induced degradation, then potential induced degradation is rectified to some extent, but initial light-induced degradation and material aging degradation cannot be rectified
Solution Approach 1:
The patent applies a single rectification current injection method that can simultaneously address multiple degradation types (initial light-induced degradation, material aging degradation, and potential induced degradation) rather than requiring separate methods for each degradation type, making the rectification system universal across different degradation mechanisms
2Reliability
If rectification current is injected into the photovoltaic module, then all types of degradations are rectified, but the module must stop outputting during rectification
Solution Approach 1:
The patent implements a dynamic rectification process where the module transitions from power generation mode to rectification mode temporarily, then returns to power generation mode after rectification, allowing the system to adapt between different operational states to achieve both comprehensive degradation rectification and maintained productivity
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 effectively rectifies all types of degradations, including light-induced, material aging, and potential induced, thereby restoring power generation efficiency and extending the lifespan of photovoltaic modules.
Implementation Method 1
an active center that causes light-induced degradation inside the photovoltaic module reacts with an injected nonequilibrium electron and hole, to change to a state in which degradation does not occur
Implementation Method 2
After the rectification current is injected, a temperature inside the photovoltaic module increases dramatically
Implementation Method 3
a relatively high potential difference is generated between the positive electrode and the negative electrode of the photovoltaic module, to separate, from the cell string, alkaline metal ions that have entered the cell string originally
Data Source
AI summary
A method for rectifying degradation of a photovoltaic module in a photovoltaic power system, includes: controlling a to-be-rectified photovoltaic module in a photovoltaic power system to stop outputting; and then injecting a rectification current into a positive or negative electrode of the to-be-rectified photovoltaic module.