In-Situ PV Array I-V Measurement with Variable Load Sweeping
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Solution Overview
Problem
Existing methods for measuring current-voltage (I-V) characteristics of photovoltaic (PV) modules in solar energy installations often require disconnecting the modules from the array, causing disruption to power output and operation.
Innovation Solution
A device and system for in-situ I-V measurement that allows PV modules to remain connected to the array, using a variable load and coupling circuit to shift the operating point of the module for measurement without significant disruption, allowing for minimal power loss and continuous operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If traditional I-V measurement methods are used, then accurate I-V data can be collected, but the PV modules must be disconnected from the array causing disruption to power output and operation
Solution Approach 1:
A measurement device is introduced as an intermediary component connected in parallel with the PV module. This device includes a variable load that can be adjusted to shift the module's operating point without disconnecting the module from the array, enabling I-V measurements while maintaining continuous power output
Solution Approach 2:
The measurement device employs a dynamically adjustable variable load that can be varied during operation to sweep through different operating points of the PV module. This dynamic adjustment allows the collection of complete I-V characteristics while the module remains connected and operational throughout the measurement process
2Measurement precision
If PV modules are disconnected for measurement, then complete I-V characteristics can be obtained, but operation disruption and power loss occur
Solution Approach 1:
The measurement system is designed to obtain complete I-V characteristics through continuous adjustment of the variable load while the PV module remains connected to the array. The useful action of power generation continues uninterrupted throughout the measurement process, eliminating energy loss associated with disconnection and reconnection operations
3Productivity
If in-situ measurement with variable load is used, then continuous operation is maintained, but device complexity increases
Solution Approach 1:
The measurement device is designed with multi-functionality, serving both as a power management component and a measurement instrument. The variable load serves dual purposes: controlling the operating point for measurement and managing power flow, thereby reducing the need for separate dedicated measurement equipment and simplifying the overall system architecture
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 accurate I-V data collection with minimal disruption to the PV array's power output and operation, providing real-time performance metrics and relative performance comparisons between modules.
Implementation Method 1
using a variable load and coupling circuit to shift the operating point of the module for measurement without significant disruption
Data Source
AI summary
In one respect, disclosed is an in-situ current-voltage (I-V) measurement device for a photovoltaic (PV) array configured to determine maximum power at a short periodic interval by estimation based at least upon measurements performed at the short periodic interval and at a long periodic interval. In another respect, disclosed is an in-situ I-V measurement device for a PV array configured to estimate a non-measured portion or key point of an I-V curve based at least upon measurements of another portion or key point of the I-V curve. In another respect, disclosed is a method for determining the maximum power of at least one PV module at a short periodic interval based at least upon measurements made at the short periodic interval and at a long periodic interval.