Solar Irradiation Metering Network for PV Power Forecasting
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Solution Overview
Problem
Current solar irradiation resource monitoring networks in photovoltaic power stations are offline and have long monitoring intervals, making them ineffective for improving the accuracy of short-term and very-short-term photovoltaic power generation predictions.
Innovation Solution
A method for constructing a real-time solar irradiation metering network involves analyzing spatial and temporal distribution characteristics, determining the location of solar irradiation metering stations using Principal Component Analysis (PCA), and equipping them with sensors and data acquisition devices to provide real-time data, ensuring high reliability and precision in photovoltaic power forecasting.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If offline monitoring with long intervals is used, then device complexity is reduced, but measurement precision and reliability of photovoltaic power forecasting deteriorate
Solution Approach 1:
The monitoring network is segmented into multiple distributed metering stations positioned at different locations within the photovoltaic base. Each station independently collects solar irradiation data, and the results are integrated to provide comprehensive real-time monitoring coverage, thereby achieving high measurement precision without requiring a single overly complex centralized system
Solution Approach 2:
A data processing and transmission system acts as an intermediary between the distributed metering stations and the forecasting system. This intermediary collects data from multiple simple stations, processes it in real-time, and transmits it to the forecasting system, enabling high-precision predictions while keeping individual monitoring devices relatively simple
2Measurement precision
If real-time monitoring with short intervals is implemented, then photovoltaic power prediction accuracy is improved, but device complexity and cost increase
Solution Approach 1:
The real-time monitoring function is divided across multiple distributed stations rather than concentrated in a single complex system. Each station performs simple local measurements and transmits data periodically, achieving collective real-time coverage through segmentation of the monitoring function
Solution Approach 2:
The metering stations are designed with multi-functionality, integrating solar irradiation sensing, data acquisition, processing, and transmission capabilities into unified devices. This universal design reduces overall system complexity by eliminating the need for separate specialized components at each location
3Measurement precision
If multiple distributed metering stations are deployed, then measurement precision and real-time monitoring capability are improved, but loss of time for data collection and processing increases
Solution Approach 1:
Data processing and preliminary analysis are performed locally at each metering station before transmission to the central system. This preliminary action at the source reduces the amount of raw data that needs to be transmitted and processed centrally, thereby reducing overall data collection and processing time despite having multiple stations
Solution Approach 2:
The system implements real-time feedback mechanisms where measurement data from multiple stations is continuously collected, processed, and used to update predictions dynamically. This feedback loop ensures that time-critical information is prioritized and processed efficiently, minimizing time loss while maintaining high measurement precision
Data Source
AI summary
A method for constructing real-time solar irradiation metering network of gigawatt-level photovoltaic power generation base comprises the following steps: Spatial and temporal distribution characteristics of irradiation quantity of the target area is analyzed based on the historical observation data of the irradiation quantity. The outline location of solar irradiation metering stations is determined by dividing the typical areas where the spatial and temporal distribution characteristics are consistent. The detailed location of solar irradiation metering stations is selected based on the center location distribution of photovoltaic power station clustering. A solar irradiation metering device is constructed on the detailed location of the solar irradiation metering station.