Distributed Power Measurement With Compressed Voltage Codewords
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Solution Overview
Problem
Existing self-powered devices for measuring electrical currents in distributed systems consume high amounts of electrical energy due to the high power requirements of radio communication modules, particularly in systems using Bluetooth or ZigBee protocols.
Innovation Solution
A distributed system for measuring electrical power that includes a device for measuring voltages and remote devices for measuring currents, where the voltage device codes samples into codewords and transmits them using a communication protocol, and the current devices decode and compute power values, employing compression techniques such as differential and double difference compression to reduce data transmission and consumption.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of information
If radio communication modules are used in self-powered current measuring devices, then data transmission capability is improved, but electrical consumption increases
Solution Approach 1:
The patent applies preliminary action by performing data compression on voltage samples before transmission. The voltage measuring device compresses the raw voltage data into a compact representation, and the current measuring device decompresses it locally. This preliminary processing reduces the communication burden and energy consumption of radio transmission while preserving the necessary measurement information.
Solution Approach 2:
The patent extracts only the essential information from the voltage measurements for transmission. Instead of transmitting complete raw voltage samples, the system extracts and transmits compressed representations that contain the necessary power calculation information, thereby reducing communication energy requirements.
2Measurement precision
If complete voltage samples are transmitted to current measuring devices, then measurement precision is improved, but communication time increases
Solution Approach 1:
The patent changes the parameter representation by transforming raw voltage samples into compressed forms that retain the essential information needed for power calculations. By changing how the data is encoded and transmitted, the system maintains measurement precision while significantly reducing communication time and data volume.
Data Source
AI summary
A distributed system for measuring electrical power in an electrical installation powered by a cyclical alternating electrical signal, the system including a device for measuring voltages and at least one device for measuring currents suitable for communicating according to a communication protocol. The device for measuring voltages is configured, during a transmission period including a plurality of successive cycles of the electrical signal, to code the samples of voltage, per cycle, to form a codeword and to transmit the codeword to the device(s) for measuring currents. Each device for measuring currents is configured to receive at least two successive communication frames, each frame corresponding to a cycle of the electrical signal; for each frame, to determine and apply a decompression method to obtain N decoded samples of voltage, and to compute a series of power values.