Photovoltaic Inverter Power Factor Control for Output Compensation
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Solution Overview
Problem
In photovoltaic systems, uneven electricity outputs from multiple photovoltaic cells can lead to a reduction in overall system output when all inverters are controlled uniformly, as some cells may experience decreased electricity generation due to factors like weather conditions.
Innovation Solution
A photovoltaic system with a controller that determines reduced electricity output states for individual inverters, adjusts the power factor of underperforming inverters to decrease their output, and compensates by increasing the power factor of other inverters to maintain overall system efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of operation
If all inverters are controlled uniformly, then control simplicity is maintained, but overall system electricity output decreases when some photovoltaic cells experience reduced generation
Solution Approach 1:
The patent applies local quality by differentiating control strategies for individual inverters based on their specific operating conditions. The controller determines whether each inverter is in a reduced electricity output state and applies different power factor control strategies accordingly - inverters in reduced output states have their power factors decreased while others have power factors increased, optimizing overall system output rather than applying uniform control
Solution Approach 2:
The patent implements dynamics by making the control system adaptive and responsive to changing conditions. The controller dynamically adjusts power factor settings based on real-time monitoring of electricity output states, allowing the system to respond to varying weather conditions and photovoltaic cell performance rather than maintaining static uniform control parameters
2Productivity
If power factor of underperforming inverters is decreased to reduce their output, then compensation by other inverters can occur, but control complexity increases
Solution Approach 1:
The patent employs feedback mechanisms where the controller continuously monitors the electricity output states of all inverters and uses this information to dynamically adjust power factor settings. The system measures actual output, compares it against expected performance, and automatically compensates by adjusting power factors of other inverters, creating a closed-loop control system that manages complexity through intelligent automation
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 approach ensures that the overall electricity output of the photovoltaic system is maintained even when some photovoltaic cells experience reduced electricity generation, by dynamically adjusting the power factors of inverters to compensate for the changes.
Implementation Method 1
a photovoltaic system is known to convert direct-current (DC) power generated by a photovoltaic cell to alternating-current (AC) power
Data Source
AI summary
A photovoltaic system includes photovoltaic cells, inverters, a reduced electricity output state determiner which determines whether each of the photovoltaic cells is in a reduced electricity output state, a first command value generator which generates a first command value for decreasing a first power factor of a first inverter determined as in the reduced electricity output state, a second command value generator which generates a second command value for increasing a second power factor of at least one of second inverters so as to compensate for output power of the first inverter, and a controller which controls the inverters.