Solar Radiation Data for PV Power Estimation Accuracy
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Solution Overview
Problem
Current power generation amount estimation methods for distribution grids face challenges in achieving high accuracy due to the 30-minute data collection interval of smart meters, which is insufficient for real-time adjustments during sudden weather changes, leading to potential voltage deviations.
Innovation Solution
A power generation amount estimation apparatus that acquires solar radiation data at intervals shorter than smart meter data collection intervals, using this data to estimate the power generation amount of photovoltaic facilities connected to the high-voltage grid, allowing for more precise calculations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If smart meter data collection interval is used (30 minutes), then device complexity is reduced and ease of operation is improved, but measurement precision and reliability of power generation amount estimation deteriorate
Solution Approach 1:
The patent introduces solar radiation amount measurement values as an intermediary parameter to estimate power generation amounts. Instead of directly measuring power generation at high frequency, the system uses solar radiation data (which can be obtained at shorter intervals) as a mediator to calculate and estimate the power generation amount, thereby achieving high-precision estimation without requiring complex high-frequency power measurement infrastructure.
Solution Approach 2:
The patent replaces direct mechanical/electrical measurement of power generation (using smart meters with fixed intervals) with a calculation-based estimation system using solar radiation data. This substitution allows the system to achieve near real-time estimation capability without being constrained by the hardware limitations of smart meter data collection intervals.
2Reliability
If data collection interval is shortened to achieve near real-time estimation, then reliability of voltage control is improved, but loss of time and measurement precision requirements increase
Solution Approach 1:
The system performs preliminary measurement of solar radiation amounts at intervals shorter than smart meter intervals. By capturing solar radiation data in advance at high frequency, the system prepares the necessary input data for power generation estimation, enabling timely and reliable voltage control decisions without waiting for smart meter data collection cycles.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables high-accuracy estimation of power generation amounts, helping to maintain voltage within appropriate ranges by providing near real-time data for voltage control, thus preventing deviations caused by sudden weather changes.
Implementation Method 1
an acquisition unit to acquire a solar radiation amount that is a measurement value measured by a solar radiation meter
Data Source
AI summary
A distribution grid management apparatus that is a power generation amount estimation apparatus includes a communication unit to acquire a solar radiation amount that is a measurement value measured by a solar radiation meter at an interval shorter than a data collection interval that is an interval at which a measurement value from a smart meter that measures the amount of electric power is collected; and a power generation amount calculation unit to estimate, on the basis of the solar radiation amount, the power generation amount of each of a plurality of photovoltaic facilities connected to a distribution line of a high-voltage grid.