Interleaving Converter Phase Control for Stable PV Output
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Solution Overview
Problem
Existing power conversion systems for photovoltaic modules experience instantaneous reduction in output power due to changes in switching frequency, leading to inefficiencies and potential distortion in output current.
Innovation Solution
The implementation of a power conversion apparatus with interleaving converters, where the switching periods and phase differences between converters are dynamically adjusted in response to changes in switching frequencies, ensuring stable output power and preventing instantaneous power reduction.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If the switching frequency of interleaving converters is changed, then the power conversion efficiency is improved, but the output power experiences instantaneous reduction
Solution Approach 1:
The patent applies dynamics by making the switching periods of interleaving converters adjustable rather than fixed. The controller dynamically changes switching periods to optimize power conversion efficiency while maintaining stable output power, resolving the contradiction between efficiency improvement and power stability.
Solution Approach 2:
The patent changes the parameter of switching period to improve power conversion efficiency. By adjusting the switching period parameter of interleaving converters, the system achieves better efficiency while the controller compensates for any output power fluctuations through coordinated control of multiple converters.
2Use of energy by moving object
If the switching frequency of interleaving converters is changed, then the power conversion efficiency is improved, but the output current becomes distorted
Solution Approach 1:
The system dynamically adjusts switching periods while the controller coordinates multiple interleaving converters to maintain proper phase relationships. This dynamic control ensures that output current quality is preserved even as switching frequency changes to improve efficiency.
Solution Approach 2:
The controller monitors the operation of interleaving converters and adjusts switching periods based on feedback to maintain both high efficiency and clean output current. The coordinated control of multiple converters with adjusted switching periods prevents current distortion while achieving efficiency improvements.
3Use of energy by moving object
If the switching period of interleaving converters is adjusted, then the power conversion efficiency is improved, but the phase relationship between converters becomes unstable
Solution Approach 1:
The patent changes the switching period parameter to improve efficiency while the controller coordinates multiple interleaving converters to maintain stable phase relationships. The coordinated control ensures that even with different switching periods, the phase relationships between converters remain stable and synchronized.
Data Source
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AI summary
Discussed are a power conversion apparatus and a photovoltaic module including the power conversion apparatus. The power conversion apparatus includes a converter unit to convert DC voltage from a solar cell module, the converter unit including a plurality of interleaving converters, and a controller to control the converter unit, wherein the controller changes switching periods of the interleaving converters and changes phase differences between the interleaving converters during operation sections of the interleaving converters, in response to a change of the switching periods of the interleaving converters. Consequently, it is possible to prevent instantaneous reduction of output power due to change of switching frequencies of the interleaving converters.