Feeder Solar Generation Estimation via Load-Irradiance Scaling
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Solution Overview
Problem
The variability in solar generation from distributed photovoltaic (PV) panels makes it difficult for grid operators to manage and operate a reliable electrical grid, as they lack accurate data on the total solar generation capacity, especially with the rapid increase in small, unreported installations.
Innovation Solution
A method that calculates maximum solar irradiance conditions and records actual changes in electrical load to identify solar generation variations, using a scaling factor derived from comparing load changes to the irradiance curve, estimating solar generation capacity without monitoring individual PV panels.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If utilities monitor individual PV panels, then measurement precision of solar generation capacity is improved, but device complexity and cost increase significantly
Solution Approach 1:
The patent combines multiple measurement approaches (irradiance sensors, load change measurements, active power/reactive power analysis) into a unified estimation system. Instead of monitoring each PV panel individually, the system merges these different data sources to collectively estimate total solar generation capacity on the feeder, reducing device complexity while maintaining measurement precision.
Solution Approach 2:
The patent introduces intermediate measurement parameters (irradiance levels, load changes, power factor variations) that serve as mediators between the PV panels and the estimation system. These intermediaries provide indirect but accurate information about solar generation capacity without requiring direct monitoring of each panel, thus reducing system complexity.
2Loss of information
If utilities record all solar installations, then information completeness is improved, but loss of time and resources for data management increases
Solution Approach 1:
The system enables self-service estimation by using automatically measured parameters (irradiance, load changes, power factor) that provide information about solar generation capacity without requiring manual data collection or utility intervention. The feeder's own operational data serves the dual purpose of power delivery and capacity estimation, eliminating time-consuming data management processes.
3Measurement precision
If the system analyzes active power and reactive power, then measurement precision of solar-driven load changes is improved, but device complexity increases
Solution Approach 1:
The patent applies partial action by focusing analysis only on specific power parameters (active power and reactive power) that are most indicative of solar generation variations. Rather than analyzing all electrical parameters, the system selectively monitors these two key parameters, achieving sufficient measurement precision without the complexity of comprehensive power analysis.
Data Source
AI summary
A method for estimating an amount of solar generation capacity on a portion of the electrical grid such as a feeder. The method calculates maximum irradiance conditions for the feeder's geographic location and the time of year, and also records actual changes in electrical load measured periodically at a source over a time span such as a month. An additional analysis of active power against reactive power on the feeder is used to identify changes in load which were driven by real consumption versus those driven by changes in solar generation. A comparison of the actual changes in electrical load due to solar generation variation to the maximum irradiance curve yields a scaling factor and provides an estimate of the solar generation capacity on the feeder.