Power Measurement Using Phase Voltage and Current Differences
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Solution Overview
Problem
Existing power measurement systems struggle to accurately measure power on unbalanced loads and are costly due to the requirement of multiple transformers and measuring channels in three-phase systems.
Innovation Solution
A system and method that measure power using voltage and current differences between phases, employing a single voltage sensor and current sensor to determine power production, which can accurately measure unbalanced loads using only two transformers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If a 2-element power measurement system is used, then the device complexity is reduced, but the measurement precision deteriorates on unbalanced loads
Solution Approach 1:
The patent applies asymmetry by using different measurement configurations for different phases. Specifically, it measures voltage and current in phase A, and only voltage in phase B, creating an asymmetric measurement approach that simplifies the device while maintaining accuracy for unbalanced loads through selective measurement of critical parameters
2Measurement precision
If a 3-element power measurement system is used, then the measurement precision is improved, but the device complexity and cost increase
Solution Approach 1:
The patent extracts only the essential measurements needed for accurate power calculation. Instead of measuring all three phases completely (3-element system), it extracts and measures only the critical voltage and current parameters from two phases, removing unnecessary measuring elements while preserving measurement precision
Solution Approach 2:
The measurement system is designed to handle both balanced and unbalanced load conditions universally. By measuring voltage and current in phase A and voltage in phase B, the system achieves multi-functionality that works for various load conditions without requiring the full 3-element configuration
Data Source
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AI summary
Some embodiments relate to a system for measuring power produced by a power source. The system includes a first voltage sensor for sensing a first voltage difference between a first voltage and a second voltage and a second voltage sensor for sensing a second voltage difference between a third voltage and the second voltage. The system further includes a first current sensor for sensing a current difference between a first current and a second current, and a second current sensor for sensing a current difference between a third current and the second current. The system further includes a power measuring device that determines the power produced by the power source using the first and second voltage differences and the first and second current differences.