Corrected I-V Curve Method for Stray Capacitance in Electrical Systems
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Solution Overview
Problem
Existing methods for determining the current-voltage characteristic curve of electrical systems, particularly photovoltaic systems, are hindered by stray capacitive and inductive effects, which deform measurements and make it difficult to obtain reliable I-V curves, especially when measurements are taken in short times to avoid disrupting system operation and minimize energy losses.
Innovation Solution
A method that involves obtaining two current-voltage curves at different measurement rates, determining voltage operating points, and using a single notional capacitance to model and correct intrinsic stray effects, allowing for the calculation of correction values to produce a corrected current-voltage curve that reflects the actual operating state of the system.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If measurements are performed in a very short time to avoid disrupting system operation and minimize energy losses, then productivity and energy efficiency are improved, but measurement precision deteriorates due to stray capacitive and inductive effects deforming the I-V curve
Solution Approach 1:
The patent applies this principle by using the stray capacitive effects that deform the I-V curve measurements as the basis for calculating correction values. By measuring the deformation caused by capacitance during short-duration measurements and using this information to compute correction factors, the harmful stray effects are converted into useful data that enables accurate correction of the I-V curve, thereby maintaining measurement precision while preserving the benefit of short measurement times
Solution Approach 2:
The patent applies this principle by changing the measurement rate parameter - performing measurements at different rates (first and second measurement rates) to capture the dynamic behavior of the stray capacitive effects. By varying the measurement rate and observing how the I-V curve deforms under different conditions, the method enables calculation of correction values that compensate for these effects, thus maintaining accuracy despite short measurement durations
2Loss of energy
If measurements are performed in a very short time, then energy losses and heat dissipation are reduced, but reliability of measurement data deteriorates due to deformation from stray effects
Solution Approach 1:
The patent converts the harmful stray capacitive effects into beneficial information by measuring the deformation they cause during short measurements and using this deformation data to calculate correction values. This allows the method to maintain data reliability while preserving the energy efficiency benefits of short measurement times
Solution Approach 2:
The patent applies feedback by using the measured I-V curve deformation caused by stray effects as input to calculate correction values, which are then applied to correct the measurement data. This feedback loop ensures that even though measurements are performed quickly (minimizing energy losses), the resulting data remains reliable through systematic correction of the stray effect deformations
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 eliminates stray effects, enabling the production of reliable and accurate I-V curves even during short measurement times, facilitating reliable diagnostics and reducing energy losses by minimizing disruption to the system's operation.
Implementation Method 1
using a single notional capacitance to model an intrinsic stray effect to be corrected between an input voltage without said stray effect and said output voltage
Data Source
AI summary
A method for determining a corrected current-voltage curve of an electrical system, the method including the following steps: obtaining a first current-voltage characteristic curve of the electrical system, by varying the voltage across its terminals at a first measurement rate, obtaining a second current-voltage characteristic curve of the electrical system, by varying the voltage across its terminals at a second measurement rate, different from the first rate, using a single notional capacitance to model an intrinsic stray effect to be corrected between an input voltage without the stray effect and the output voltage, determining a correction value representative of the stray effect and a step of determining a corrected current value on the basis of the determined correction value.