Smart Meter Qualimetry Reading for Low-Voltage Network Monitoring
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Solution Overview
Problem
Existing qualimetry devices, such as the PQI-D device, are expensive and not suitable for measuring qualimetric data in the low-voltage portion of the distribution network near the end consumer, necessitating a method to obtain accurate qualimetric data with minimal additional expenditure.
Innovation Solution
A method and system for reading qualimetric data by a qualimetry device that communicates with meters, involving data calculation, timestamping, and storage, with optional authentication and signature verification, using wireless communication protocols like WM-Bus, to collect and store data from multiple meters.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If expensive qualimetry devices like PQI-D are used to obtain accurate qualimetric data, then measurement precision is improved, but device cost increases
Solution Approach 1:
The meter itself performs the qualimetric measurements and calculations using its own processing capabilities and memory resources. The meter calculates qualimetric data from measured electrical parameters, timestamps the data, and stores it locally, eliminating the need for expensive external qualimetry devices while maintaining measurement accuracy at the point of supply
Solution Approach 2:
The patent introduces an intermediate solution where the existing smart meter acts as both the measurement device and the qualimetry device. The meter serves as an intermediary between the electrical network and the data collection system, performing qualimetric calculations that were previously reserved for expensive dedicated devices, thereby reducing overall system cost while maintaining Class A measurement precision
2Reliability
If qualimetric data is collected at the end consumer level, then data reliability is improved, but device complexity increases
Solution Approach 1:
The smart meter is designed to perform multiple functions including consumption measurement, qualimetric data calculation, data storage, and communication. By making the meter universal and multi-functional, the system achieves reliable end-consumer level data collection without adding separate complex devices, as the existing meter infrastructure is leveraged to perform qualimetry functions
Solution Approach 2:
The qualimetric measurement function is segmented from the traditional role of dedicated qualimetry devices and integrated into the meter's existing architecture. The measurement, calculation, storage, and communication functions are divided into discrete processing steps that the meter executes sequentially, managing complexity through functional segmentation rather than hardware proliferation
Data Source
AI summary
A method for reading qualimetric data by a qualimetry device configured for communicating with N meters includes, for each of said N meters: calculating, by said meter, qualimetric data over a time period and timestamping said qualimetric data; sending, by the qualimetry device, a request for qualimetric data to said meter; in response to said request, sending, by said meter, said timestamped qualimetric data to said qualimetry device; and on reception of said timestamped qualimetric data by said qualimetry device, storing said timestamped qualimetric data in memory in association with an identifier of said meter that sent said timestamped qualimetric data.