Electricity Meter Sample Compensation for Power Accuracy
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Solution Overview
Problem
Existing electric meters face inaccuracies in voltage and current measurements due to the specific characteristics of components like shunts, resistors, and toroids, leading to residual inaccuracy in power calculations, particularly in polyphase systems.
Innovation Solution
Applying amplitude and phase adjustments directly to voltage and current measurement samples before performing power calculations, using interpolation to compensate for component-specific inaccuracies, and adjusting for the spread of voltage samples over current samples.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If amplitude and phase compensation are applied at the power calculation level, then the implementation is simpler, but residual inaccuracy increases
Solution Approach 1:
The patent applies amplitude compensation factor Ku and phase compensation angle Δφ to voltage measurement samples U and current measurement samples I before performing power calculations. This preliminary adjustment of measurement samples ensures that the compensation is integrated into the measurement process itself, eliminating residual inaccuracies that would otherwise remain after calculation-level compensation.
2Device complexity
If standard measurement components (shunts, toroids, resistors) are used, then the device complexity is reduced, but measurement precision deteriorates due to component tolerances
Solution Approach 1:
The patent introduces adjustable compensation parameters Ku (amplitude compensation factor for voltage), KI (amplitude compensation factor for current), and Δφ (phase compensation angle) that can be calibrated to match the specific characteristics of each meter's components. This allows standard components with typical tolerances (±1% for resistors, ±5% for shunts) to be used while achieving high measurement precision through parameter optimization.
3Adaptability or versatility
If polyphase systems are measured, then the versatility of the electric meter increases, but measurement precision worsens due to different phase shifts in each phase
Solution Approach 1:
The patent applies individual compensation parameters to each phase in polyphase systems. Each phase can have its own amplitude compensation factors (Ku, KI) and phase compensation angle (Δφ), allowing the system to account for the specific characteristics and phase shifts of each phase independently. This localized compensation approach maintains high precision across all phases simultaneously.
Data Source
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AI summary
To establish the electrical consumption of an electrical installation that is electrically supplied by at least one phase and is supervised by an electricity meter, a method implemented by an electricity meter controller includes: obtaining (601, 603), for each phase, voltage measurement samples and current measurement samples; applying (602) an amplitude adjustment Ku and a phase adjustment Δϕ to the voltage measurement samples to obtain adjusted voltage samples; applying (604) an amplitude adjustment KI and a phase adjustment Δϕ' to the current measurement samples to obtain adjusted current samples; performing (605) at least one power calculation from the adjusted voltage and current samples; and establishing (606) the electrical consumption from said at least one power calculation.