Photovoltaic Prognostics Using Neural Network Performance Prediction

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Solution Overview

Problem

Current photovoltaic (PV) monitoring systems lack effective prognosis and health management capabilities to predict and address performance deviations and faults in PV systems, leading to inefficiencies and potential energy losses due to factors like shading, inverter failures, and material degradation.

Innovation Solution

A PV system with a modeling component that uses artificial neural networks (ANNs) to generate anticipated operating metrics based on current data, comparing them to actual metrics to detect deviations, and triggering remedial actions or alarms when thresholds are exceeded, allowing for proactive maintenance and fault detection.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If PV monitoring systems use traditional fault detection methods, then they can identify faults after they occur, but they cannot predict performance deviations before they happen

Engineering Contradiction:
Improvefault detection capabilityVSAvoidresponse time to faults
Core Design Contradiction:
ReliabilityVSLoss of time

Solution Approach 1:

The system performs preliminary actions by training neural network models during an initial period when the PV system is operating normally. These trained models then predict expected performance metrics during subsequent operation, enabling the system to detect faults before they occur by comparing actual performance against predicted performance. This preliminary modeling action transforms the system from reactive fault detection to proactive fault prediction.

Inventive Principle:
Principle #10Preliminary action

Solution Approach 2:

The system implements feedback by continuously comparing actual performance metrics against predicted metrics generated by the neural network models. When deviations exceed predefined thresholds, the system generates alerts and can trigger remedial actions. This closed-loop feedback mechanism enables real-time monitoring and prediction, allowing the system to respond to performance deviations before they result in significant energy losses or system failures.

Inventive Principle:
Principle #23Feedback

2Loss of energy

If PV systems operate without prognosis capabilities, then the system structure remains simple, but energy losses occur due to undetected faults and performance deviations

Engineering Contradiction:
Improveenergy loss from faultsVSAvoidsystem structure
Core Design Contradiction:
Loss of energyVSDevice complexity

Solution Approach 1:

The system employs self-service by utilizing the PV system's own operational data to train and operate neural network models that predict its own performance. The system monitors its own metrics, compares them against predictions, and autonomously generates alerts or triggers remedial actions when deviations are detected. This self-monitoring and self-diagnosis capability reduces energy losses from faults without requiring extensive external monitoring infrastructure.

Inventive Principle:
Principle #25Self-service

Solution Approach 2:

The system replaces complex mechanical or electronic monitoring hardware with software-based neural network models that run on existing computational infrastructure. Instead of adding numerous physical sensors and monitoring devices, the invention uses algorithmic models processed through standard computing systems, thereby reducing energy losses while minimizing increases in physical system complexity.

Inventive Principle:
Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If traditional monitoring systems are used, then installation and maintenance are straightforward, but they cannot detect gradual material degradation or performance trends

Engineering Contradiction:
Improveperformance measurement accuracyVSAvoidmonitoring system complexity
Core Design Contradiction:
Measurement precisionVSDevice complexity

Solution Approach 1:

The system applies parameter changes by transforming raw performance data into predicted performance metrics through neural network models. These models learn from historical data and adapt to changing system characteristics, enabling precise detection of gradual material degradation and performance trends. The ability to dynamically adjust prediction parameters based on learned patterns enhances measurement precision without requiring complex additional hardware.

Inventive Principle:
Principle #35Parameter changes

Data Source

PatentUS9939485B1Prognostics and health management of photovoltaic systems
Publication Date: 2018.04.10 NATIONAL TECHNOLOGY & ENGINEERING SOLUTIONS OF SANDIA LLC
  • US9939485B1 patent drawing
  • US9939485B1 patent drawing
  • US9939485B1 patent drawing

AI summary

The various technologies presented herein relate to providing prognosis and health management (PHM) of a photovoltaic (PV) system. A PV PHM system can eliminate long-standing issues associated with detecting performance reduction in PV systems. The PV PHM system can utilize an ANN model with meteorological and power input data to facilitate alert generation in the event of a performance reduction without the need for information about the PV PHM system components and design. Comparisons between system data and the PHM model can provide scheduling of maintenance on an as-needed basis. The PHM can also provide an approach for monitoring system/component degradation over the lifetime of the PV system.