Distributed Power Determination via Characteristic Extraction
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Solution Overview
Problem
Distributed electrical power determination in systems with multiple consumers faces challenges due to the need to transmit large amounts of data for accurate power calculation, particularly when current and voltage measurements are taken at different locations, leading to measurement inaccuracies and increased hardware requirements.
Innovation Solution
A method that records voltage and current measurements at different locations, analyzes these measurements to determine characteristics such as spectral values and DC components, and transmits these characteristics instead of raw data, allowing for efficient power calculation with reduced data volume and improved accuracy, especially in systems with high harmonic content.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If instantaneous values for current and voltage are transmitted to determine power exactly, then measurement precision is improved, but data transmission volume increases significantly
Solution Approach 1:
The patent extracts and transmits only the essential characteristics (effective values, phase differences, harmonic coefficients) from the raw instantaneous measurement data. Instead of transmitting all instantaneous voltage and current values, the system extracts key parameters that are sufficient for power calculation, thereby reducing data transmission volume while maintaining measurement precision.
Solution Approach 2:
The patent transforms the measurement data from instantaneous time-domain values to frequency-domain parameters (effective values, phase angles, harmonic coefficients). This parameter transformation allows power determination to be performed with reduced data while maintaining or improving accuracy, especially in systems with harmonic content.
2Quantity of substance
If effective values for current and voltage are used to determine power, then data transmission volume is reduced, but measurement precision deteriorates due to loss of harmonic information
Solution Approach 1:
The patent combines multiple types of parameters into a composite data structure for transmission: effective values (for baseline power calculation), phase differences (for power factor determination), and harmonic coefficients (for distortion power calculation). This composite approach ensures that all necessary information for accurate power determination in non-sinusoidal conditions is included while keeping data volume manageable.
3Measurement precision
If voltage measurements are performed at each consumer location, then measurement precision is improved, but device complexity and hardware requirements increase
Solution Approach 1:
The patent implements a universal voltage measurement approach where a single voltage measurement device serves multiple consumers. The measured voltage characteristics (effective value, phase, harmonics) are transmitted to each consumer's control unit, which then performs local power calculations using its own current measurements combined with the shared voltage data. This eliminates the need for separate voltage measurement devices at each location.
4Measurement precision
If current and voltage measurements are taken at the same location, then measurement precision is improved, but device complexity increases due to redundant hardware
Solution Approach 1:
The patent divides the measurement function into separate components: voltage measurement is performed centrally at one location, while current measurements are performed locally at each consumer. The system segments the measurement tasks spatially and functionally, transmitting only essential voltage characteristics to each consumer's control unit. This segmentation reduces hardware redundancy while maintaining the ability to perform accurate power calculations through coordinated measurement and communication.
Data Source
AI summary
A method for distributed electrical power determination of at least one consumer connected to a voltage source via a voltage path, where a voltage measurement device determines a supply voltage of the voltage source at a voltage measurement point and at least one current measurement device determines a consumer current of the consumer at a current measurement point. The method comprises recording measured values of the supply voltage to determine a voltage curve of the supply voltage, recording measured values of the consumer current to determine a current curve of the consumer current, analyzing the measured values of the supply voltage and/or the measured values of the consumer current with an analysis function to determine voltage characteristics of the voltage curve and/or current characteristics of the current curve, and determining at least one power value taking into account the voltage and/or current characteristics.