Centralized Curve Tracing for Photovoltaic Array Synchronization
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Solution Overview
Problem
Existing photovoltaic power generation systems face challenges in synchronously managing and evaluating output curve characteristics and power generating conditions across multiple systems, particularly in large-scale installations, due to the lack of synchronized management and control of built-in curve tracers and insufficient failure diagnosis tools.
Innovation Solution
A power generation system incorporating a supervisory remote control apparatus that communicates with power conditioners and measurement apparatuses to trace I-V characteristic diagrams in synchronization, using actinometers to measure solar radiation intensity and air temperature, enabling synchronized evaluation and control of photovoltaic arrays.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If each power conditioner has a built-in curve tracer to measure I-V characteristics, then output abnormality can be judged visually, but many curve tracers cannot be managed and controlled in synchronization in large-scale systems
Solution Approach 1:
The patent merges multiple distributed curve tracers into a single centralized curve tracer located in the supervisory remote control apparatus. This centralized device receives I-V characteristic data from multiple photovoltaic arrays and traces their curves simultaneously, eliminating the need to manage multiple independent curve tracers while maintaining measurement precision for abnormality detection.
Solution Approach 2:
The supervisory remote control apparatus acts as an intermediary between the photovoltaic arrays and the curve tracing function. Instead of each array having its own curve tracer, the supervisory apparatus mediates the measurement process by collecting data from arrays and performing centralized curve tracing, thereby simplifying system management.
2Measurement precision
If solar radiation intensity and air temperature are not traced, then the system structure remains simple, but evaluation based on comparison with characteristic estimated value from reference conditions cannot be performed
Solution Approach 1:
The supervisory remote control apparatus is designed with multi-functionality, serving both as a control system for photovoltaic arrays and as a measurement system for environmental parameters. By integrating solar radiation intensity measurement and air temperature measurement capabilities into the existing supervisory apparatus, the system achieves comprehensive evaluation functionality without proportionally increasing device complexity.
3Reliability
If I-V characteristic tracing is performed without synchronizing with control commands, then the tracing process is simpler, but the traced data does not reflect actual operating conditions under maximum power point tracking
Solution Approach 1:
The system implements feedback synchronization where the centralized curve tracer receives control command information from the supervisory remote control apparatus and uses this feedback to coordinate its measurement timing. This ensures that I-V characteristic tracing is performed at appropriate moments when the photovoltaic arrays are operating under controlled conditions, improving data reliability without excessive complexity.
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
This solution allows for efficient evaluation of photovoltaic array performance, synchronized management of output curve characteristics, and effective diagnosis of system abnormalities, including environmental impacts and equipment deterioration, enhancing the accuracy of maximum power point tracking and overall system performance.
Implementation Method 1
a power generating condition detector as solar radiation intensity detector including actinometers that measure solar radiation intensity as power generating conditions of the respective photovoltaic arrays
Implementation Method 2
a photovoltaic array, a power conditioner which converts direct-current power generated by the photovoltaic array
Data Source
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AI summary
Problem to be solved: In a large-scale system including photovoltaic power generation systems, since each power conditioner has the built-in curve tracer, many curve tracers cannot be managed and controlled in synchronization with each other, and evaluation based on comparison with outputs from the photovoltaic power generation systems under the same power generating conditions is difficult. Solution: A photovoltaic power generation system includes the solar radiation intensity detector (311 ... 3N1) capable of measuring solar radiation intensity of photovoltaic arrays (41 ... 4N) and supervisory remote control apparatus (1) including a curve trace apparatus 11 to synchronously input direct-current voltage values (V) and direct current detection values (I), which are outputs from the photovoltaic arrays (41 ... 4N), and create the I-V curve and solar radiation intensity curve based on the values of solar radiation intensity measured by the detector (311 ... 3N1) to display the created curves in a display unit.