Boost Converter Dynamic Voltage Control for Switching Loss Reduction
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Solution Overview
Problem
In multi-string photovoltaic systems, the continuous operation of DC/DC boost converters leads to unnecessary switching losses and reduced efficiency due to the constant high voltage output, which is not optimized for maximum power delivery to the grid.
Innovation Solution
An electric power conversion apparatus that determines the minimum output voltage based on grid voltage and compares it with the input voltage of the converter, controlling the converter's operation to stop or continue boosting accordingly, thereby reducing unnecessary operation and switching losses.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the DC/DC boost converter operates continuously to maintain constant high voltage output, then the DC-link voltage is stabilized for grid power transfer, but switching losses increase and system efficiency decreases due to unnecessary conversion operations
Solution Approach 1:
The patent implements dynamic operation mode selection for the DC/DC boost converter, transitioning between continuous operation and skip operation modes based on real-time comparison between input voltage and minimum required output voltage. This dynamic adaptation eliminates unnecessary switching when input voltage already meets or exceeds the minimum output requirement, reducing switching losses while maintaining DC-link voltage stability when needed.
2Productivity
If the converter operates continuously to ensure maximum power delivery to the grid, then power transfer reliability is maintained, but unnecessary electric power conversion occurs leading to reduced overall system efficiency
Solution Approach 1:
The patent employs feedback control by continuously monitoring the input voltage and comparing it with the minimum required output voltage. Based on this feedback comparison, the control unit dynamically adjusts the converter operation mode (continuous or skip mode), ensuring the converter operates only when necessary to deliver maximum power to the grid, thereby eliminating unnecessary conversion operations and improving overall system efficiency.
Data Source
AI summary
The disclosure relates to an electric power conversion apparatus, and capable of determining a minimum output voltage of a boost converter based on a voltage of the grid, and comparing the minimum output voltage of the converter with an input voltage of the converter, and controlling the operation of the converter based on the comparison result, thereby reducing the unnecessary operation and switching loss of the converter, the electric power conversion apparatus according to the invention comprises a converter; and a control unit configured to detect a grid voltage to determine a minimum output voltage of the converter based on the grid voltage, and control the operation of the converter based on an input voltage of the converter and the determined minimum output voltage.