Distribution Facility Selection via Total Current Calculation
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Solution Overview
Problem
Conventional technologies for estimating maximum load in distribution systems often result in either excessive or insufficient capacity selection of distribution facilities, due to inaccuracies in calculating peak load, especially with the influence of low-voltage distributed generation systems and reverse power flows, leading to inefficient facility sizing.
Innovation Solution
A facility selection supporting program that calculates the total current value of consumers in a power supply section and recommends distribution facilities based on this value, using smart meter data and distribution system information to accurately determine peak and off-peak load currents, thereby selecting facilities with appropriate capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the maximum load is estimated based on monthly power consumption data, then the facility capacity can be determined, but the estimation becomes inaccurate when reverse power flow occurs or distributed generation systems are present, leading to either excessive or insufficient capacity selection
Solution Approach 1:
The patent changes the measurement parameter from monthly power consumption to instantaneous current values. By measuring current at multiple time points and calculating total current values, the system accurately captures peak loads even in the presence of reverse power flow and distributed generation, resolving the inaccuracy of conventional estimation methods
Solution Approach 2:
The system incorporates feedback by continuously monitoring current values and using them to determine the maximum load. This feedback mechanism allows the system to adapt to changing load conditions and distributed generation outputs, ensuring accurate facility capacity determination regardless of power flow direction
2Reliability
If the maximum load is estimated conservatively to prevent exceeding facility capacity, then reliability is improved, but the selected facility capacity becomes excessive, increasing costs
Solution Approach 1:
The system performs preliminary measurement of current values at multiple time points before facility selection. By calculating total current values from these preliminary measurements, the system determines the actual maximum load in advance, allowing selection of facilities with appropriate capacity rather than excessive capacity, thus reducing costs while maintaining reliability
3Device complexity
If the maximum load is not estimated due to reverse power flow, then the estimation process is simplified, but the selected facility capacity becomes insufficient, causing reliability issues
Solution Approach 1:
The patent segments the power flow measurement into multiple current value measurements at different time points. By calculating total current values from these segmented measurements, the system accurately captures the maximum load regardless of reverse power flow conditions, ensuring reliable facility capacity determination without oversimplifying the estimation process
Data Source
AI summary
A facility selection supporting device calculates a total current value of consumers located in and after a certain power supply section on the way from a distribution substation to a particular consumer and outputs a recommended distribution facility for the power supply section based on the calculated total current value.