Load Estimating Device Using Apparent Power and Power Factor
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Solution Overview
Problem
Existing load estimation techniques for power generators require vast training data for neural networks, involve complex frequency analysis, and cannot efficiently estimate multiple loads simultaneously, leading to inefficiencies in determining the type and operable time of connected loads.
Innovation Solution
A load estimating device that includes a measuring circuit to measure voltage and current, a calculating unit to determine feature amounts such as apparent power and power factor, and a storage device to store feature amounts of combinations of loads, allowing for accurate estimation of connected loads and their operable times based on calculated and stored data.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If neural network learning is used for load estimation, then load type determination capability is improved, but vast training data is required and device complexity increases
Solution Approach 1:
The patent extracts only the essential features needed for load estimation (voltage and current measurements) and uses simple comparison logic instead of complex neural networks. The system extracts feature amounts from measured values and compares them against stored reference data to determine load types, eliminating the need for vast training datasets while maintaining determination capability.
Solution Approach 2:
The patent replaces expensive and complex neural network models with simple, lightweight calculation algorithms that require minimal computational resources. The feature amount calculation uses basic mathematical operations on voltage and current measurements, and the comparison with stored data uses simple matching logic, making the system much less complex and more efficient.
2Measurement precision
If frequency analysis is used for load estimation, then operation state determination capability is improved, but calculation complexity and processing time increase
Solution Approach 1:
The patent extracts only the necessary feature amounts (voltage and current measurements) needed for load estimation and operates state determination. Instead of performing comprehensive frequency analysis, the system calculates feature amounts directly from measured values and compares them with stored reference data, significantly reducing calculation complexity and processing time while maintaining determination accuracy.
3Measurement precision
If single load estimation methods are used, then estimation accuracy for individual loads is improved, but ability to estimate multiple loads simultaneously deteriorates
Solution Approach 1:
The patent creates a universal estimation system that can handle both single loads and multiple loads simultaneously. The feature amount calculation method works for any combination of loads, and the comparison logic can match against stored reference data for individual loads or combinations of loads. This makes the system adaptable to various scenarios without sacrificing estimation accuracy.
Solution Approach 2:
The patent merges the estimation capabilities for multiple loads into a unified system. The feature amounts calculated from voltage and current measurements represent the combined effect of all connected loads, and the comparison with stored reference data can identify combinations of loads. This allows simultaneous estimation of multiple loads while maintaining the accuracy benefits of individual load estimation methods.
Data Source
AI summary
A load estimating device measures a voltage and a current supplied to a plurality of loads connected with a power supply, and obtains feature amounts of the plurality of loads from measurement values of the voltage and the current. A storage device stores a feature amount of each combination of two or more loads in advance. The load estimating device estimates what the plurality of loads connected with the power supply device are, on the basis of the obtained feature amounts and the feature amounts stored in the storage device. The feature amount includes a combination of an apparent power and a power factor.