Variable-Frequency Power Converter Control for Low-Loss Transfer
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Solution Overview
Problem
Conventional power converters, such as solid-state transformers, face challenges in achieving high power transfer efficiency over a wide voltage range, particularly with low output to input voltage ratios, due to high power losses in phase shift modulation and inefficiencies in trapezoidal and triangular current shape modulations.
Innovation Solution
A method and system for power control that dynamically adjusts the switching frequency and phase of control signals based on monitored electrical parameters, selecting appropriate modulation methods like phase shift, trapezoidal current shape, or triangular current shape modulation, and limiting frequencies to optimize power transfer efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Power
If phase shift modulation is used, then high power transfer capability is achieved, but power losses increase
Solution Approach 1:
The patent applies dynamics by making the switching frequency variable rather than fixed. The control system dynamically adjusts the switching frequency based on the operating conditions and voltage ratio, allowing the converter to optimize between power transfer capability and power losses in different operating scenarios. This is achieved through iterative determination and adjustment of switching frequencies and phases during operation.
Solution Approach 2:
The patent changes the parameter of switching frequency from a fixed value to a variable parameter that can be adjusted according to operating conditions. By iteratively determining optimal switching frequencies and phases based on monitored electrical parameters, the system adapts the frequency parameter to achieve better efficiency while maintaining required power transfer capability.
2Loss of energy
If trapezoidal or triangular current shape modulation is used, then power transfer efficiency is improved, but power transfer capability is reduced for low voltage ratios
Solution Approach 1:
The patent makes the switching frequency dynamic and adjustable based on the voltage ratio and power transfer requirements. For low voltage ratios, the system can increase the switching frequency to compensate for the reduced power transfer capability of trapezoidal or triangular modulation, thereby maintaining both efficiency and adequate power transfer capability across different operating conditions.
Solution Approach 2:
The patent changes the switching frequency parameter to compensate for the limitations of trapezoidal or triangular modulation at low voltage ratios. By iteratively adjusting the frequency parameter based on monitored electrical parameters, the system optimizes the trade-off between power transfer efficiency and power transfer capability for different voltage ratio conditions.
3Power
If switching frequency is increased to improve power transfer capability, then power losses increase
Solution Approach 1:
The patent applies dynamics by making the switching frequency variable and adaptive rather than fixed. The control system dynamically determines and adjusts the switching frequency based on real-time electrical parameters and operating conditions, allowing optimal frequency selection that balances power transfer capability and power losses for each specific operating scenario.
Solution Approach 2:
The patent implements feedback by monitoring electrical parameters and using this information to iteratively determine and adjust the switching frequency. The closed-loop control system continuously monitors the operating conditions and adjusts the frequency parameter to optimize the balance between power transfer capability and power losses, preventing excessive frequency increases that would cause disproportionate losses.
Data Source
AI summary
The present disclosure relates to a method for power control of a power converter. The method includes determining, based on monitoring at least one electrical parameter of the power converter, a switching frequency of a first control signal; determining, based on the monitoring at least one electrical parameter of the power converter, a first phase angle of the first control signal; and adjusting the switching frequency and the phase of the first control signal based on the determined switching frequency and the first phase angle. The present disclosure also relates to a respective controller and system.