Non-Intrusive Power Metering via Pencil Method Load Transient Analysis
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current methods for non-intrusive determination of electrical power consumption in subscriber installations are invasive and poorly adapted to handle the increasing number of electronic devices generating electrical disturbances and noise, particularly in sinusoidal voltage supply networks.
Innovation Solution
The method employs the Pencil method for analyzing load transients by periodic sampling of supply voltage and current, grouping sampled values into observation windows, and calculating active power using poles and residues obtained through the Pencil method, allowing for non-intrusive identification of electrical loads and their consumption patterns.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional counting devices are installed in the subscriber's home to measure voltage, current and phase shift, then measurement precision is improved, but device complexity and intrusion into the private perimeter increase
Solution Approach 1:
The patent extracts the measurement function from the subscriber's private perimeter by installing counting devices at the distribution network level (outside the subscriber's premises). The system measures voltage and current at the point of common coupling between the distribution network and the subscriber's installation, eliminating the need for intrusive devices within the subscriber's home while maintaining measurement capability.
Solution Approach 2:
The patent introduces an intermediary measurement approach by analyzing the overall load curve of the installation at the distribution network level. Instead of directly measuring individual consumer devices within the private perimeter, the system uses the aggregate electrical characteristics (voltage, current, phase shift) at the boundary as an intermediary to infer consumption data, avoiding direct intrusion into the subscriber's premises.
2Ease of operation
If NIALM processes are implemented to measure supply voltage and current outside the private perimeter, then ease of operation is improved, but measurement precision deteriorates due to electrical disturbances and noise from electronic devices
Solution Approach 1:
The patent segments the measurement approach by analyzing different components of the electrical signal separately. It processes the supply voltage and current measurements to extract specific characteristics (active power, reactive power, energy consumption) through mathematical operations, allowing the system to handle the complex signal containing disturbances and noise by breaking down the analysis into manageable components.
Solution Approach 2:
The patent changes the measurement parameters by using voltage, current, and phase shift measurements at the distribution network level instead of traditional direct measurements within the subscriber's premises. This parameter change allows the system to operate non-intrusively while maintaining measurement capability, though the measurements must be processed carefully to account for electrical disturbances from electronic devices.
3Measurement precision
If manual NIALM processes are used to build a library of electrical receiving devices, then measurement precision is improved, but ease of operation deteriorates due to manual intervention requirements
Solution Approach 1:
The patent implements self-service by automatically analyzing the electrical measurements (voltage, current, phase shift) to identify consumption patterns and device characteristics without requiring manual intervention. The system automatically builds its own library of electrical receiving devices by processing the measured data and recognizing patterns, eliminating the need for manual device identification and library construction while maintaining measurement precision.
Data Source
Figure 1a~1b
Figure 2a~2b
Figure 2c
AI summary
The invention relates to a method and to a device for the non-intrusive determination of the electrical power consumed by a subscriber installation. From the sampled values of the supply current and supply voltage that are delivered to the installation, constituting a consumption signal, the sampled values are grouped (A) in successive observation time windows; the poles (S 1) and residues (R 1) of the consumption signal are discriminated (B) in each current window using the pencil method, the set of poles and residues associated with at least one singular value (SG 1) representing a combination of signatures of separate electrical loads (C 1); at least the active power consumed by a subset of electrical loads in operation is calculated (C), over at least the duration of the current observation window, the sum of the active powers consumed by each electrical load (C 1) satisfying a consumed power function linking these poles and residues. Application: measurement of the electrical energy consumed by an installation.