Power Flow Measurement Using Reference Direction Switching
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Solution Overview
Problem
Existing measurement systems for electric power transmission face challenges in accurately measuring the state of target devices that switch transmission directions based on operation modes, leading to potential human errors in selecting the correct computation formula.
Innovation Solution
A measurement device equipped with a reference retaining circuit and an electric power signal acquisition circuit, along with a processor that computes input and output electric power based on the signal direction relative to a reference transmission direction, allowing for accurate determination of electric power states across different operation modes.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If multiple computation formulae are prepared for different transmission patterns, then measurement precision is improved, but device complexity increases and human error risk increases due to manual formula selection
Solution Approach 1:
The measurement device automatically determines the current transmission pattern and selects the appropriate computation formula without human intervention. The processor identifies which transmission pattern is active based on real-time signal characteristics and autonomously applies the correct formula, making the system self-servicing and eliminating manual formula selection.
Solution Approach 2:
The system dynamically changes computation parameters based on the detected transmission pattern. Different computation formulas are selected by changing the parameter set used in the measurement calculation, allowing the same hardware to adapt to multiple transmission patterns through software-based parameter switching rather than physical reconfiguration.
2Measurement precision
If manual selection of computation formula is required, then measurement precision can be maintained, but reliability decreases due to human error in formula selection
Solution Approach 1:
The processor automatically identifies the current transmission pattern and selects the appropriate computation formula without requiring manual intervention. This self-service mechanism eliminates human error in formula selection while maintaining measurement precision through accurate automatic pattern recognition and formula matching.
Solution Approach 2:
The system continuously monitors transmission signals and uses feedback from signal characteristics to automatically determine the active transmission pattern. This feedback loop ensures the correct computation formula is always selected based on real-time conditions, improving reliability by eliminating manual selection errors.
3Measurement precision
If all transmission patterns are measured successively using all computation formulae, then measurement precision is improved, but productivity decreases due to time-consuming calculations
Solution Approach 1:
The system extracts and applies only the necessary computation formula corresponding to the currently active transmission pattern, rather than successively executing all possible computation formulas. This selective approach maintains measurement precision for the relevant pattern while dramatically improving productivity by eliminating unnecessary calculations.
Solution Approach 2:
Instead of performing complete exhaustive measurement of all transmission patterns, the system performs partial measurement focused only on the active transmission pattern. This partial action approach provides sufficient measurement precision for operational needs while significantly reducing calculation time and improving productivity.
Data Source
AI summary
A measurement device configured to measure a state of a target device that is capable of switching at least one transmission direction of a channel among transmission directions of electric power transmitted through a plurality of channels. The measurement device retains information indicating whether a reference transmission direction of the electric power transmitted to each of the channels is an input direction in which the electric power is input to the target device or an output direction in which the electric power is output from the target device, acquires a signal indicating a direction and intensity of the electric power, and computes at least one of an input electric power and an output electric power of the target device on the basis of the sign indicating the direction of the above-described signal with respect to the reference transmission direction of the electric power of each of the channels.