Three-Phase Meter Power Estimation via Neutral Wire Voltage
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Existing three-phase electricity meters fail to accurately measure energy consumption when fraud involves falsifying voltage measurements, leading to underestimation of energy usage and difficulty in recovering unpaid energy from fraudsters.
Innovation Solution
A power estimation method that detects fraudulent voltage measurement falsification on one phase by using offset and interpolated voltage samples from unaffected phases to estimate electrical power consumption, employing a microcontroller-based system with low-pass filtering and sinusoidal signal reference tables to calculate active, reactive, and apparent power.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If voltage measurements are taken directly from phases via conductive wires, then the meter can measure power consumption, but fraudsters can cut wires to falsify measurements and underevaluate energy consumed
Solution Approach 1:
The patent introduces an intermediary estimation mechanism that uses measurements from unaffected phases (via the neutral wire) to reconstruct voltage values for fraudulent phases. Instead of directly trusting the compromised voltage measurement, the system uses current measurements and neutral wire voltage to calculate estimated voltage through power balance equations, thereby mediating between the fraudulent input and the final energy calculation.
Solution Approach 2:
The system continuously monitors all phase measurements and uses feedback from unaffected phases to detect inconsistencies. When fraud is detected on one phase, the system uses feedback from other phases and the neutral wire to reconstruct the true power consumption, creating a closed-loop verification system that adapts to detected anomalies.
2Productivity
If the meter continues to take measurements on all three phases without considering fraud, then the measurement process is simple, but the total energy consumed is underevaluated
Solution Approach 1:
The patent extracts the fraudulent phase measurements from the calculation process and replaces them with estimated values derived from non-fraudulent phases. By separating the affected phase data from the energy calculation and using independent measurements from other phases combined with neutral wire data, the system removes the corrupting influence while maintaining continuous measurement capability.
Solution Approach 2:
The system dynamically changes the measurement parameters used for calculation based on fraud detection. When fraud is detected on a phase, the system switches from using direct voltage measurements to using estimated voltage values derived from power balance equations involving current measurements and neutral wire voltage, thereby adapting the measurement approach to maintain accuracy.
3Difficulty of detecting and measuring
If fraud is detected but the distributor does not know the actual energy consumed, then fraud detection is achieved, but recovery of unpaid energy is difficult
Solution Approach 1:
The patent creates a reconstructed copy of the true power consumption data by using measurements from unaffected phases and the neutral wire to estimate what the fraudulent phase measurements should have been. This copying approach generates a virtual representation of the actual energy usage that can be used for billing purposes, preserving the information needed for fraud recovery without requiring direct access to the tampered measurements.
Data Source
AI summary
Power estimation method, implemented in a three-phase electricity meter, includes the steps of detecting a fraud which falsifies measurements of a first phase voltage present on a first phase, without falsifying measurements of a second phase voltage present on a second phase; reconstituting first estimated voltage samples, images over time of the first phase voltage, from second voltage samples, images over time of the second phase voltage; and estimating at least one first electrical power consumed on the first phase by using the first estimated voltage samples.