Matrix Resonant Converter Topology for Double-Line Ripple Decoupling
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Solution Overview
Problem
Direct resonant converters based on matrix converters with Model Predictive Control face challenges in single-phase power networks, as they transfer detrimental double-line frequency ripple to the load, which is harmful to electric vehicle batteries.
Innovation Solution
A single-phase to single-phase Direct Matrix Resonant Converter with an additional leg of switches and a decoupling capacitor, operated under Model Predictive Control, absorbs the double-line frequency ripple on the DC side, enabling soft-switching conditions and sinusoidal input currents with constant output power, and can also operate with a three-phase grid by utilizing the input filter capacitor as a decoupling element.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a direct resonant converter based on matrix converter with Model Predictive Control is used for single-phase AC/DC conversion, then the conversion efficiency is improved and switching losses are reduced, but double-line frequency ripple is transferred to the load which is harmful to battery health
Solution Approach 1:
A decoupling capacitor is introduced as an intermediary element between the matrix converter output and the resonant tank input. This capacitor specifically targets and absorbs the double-line frequency ripple component, preventing it from reaching the load while allowing the fundamental frequency power to pass through to the resonant converter for efficient conversion.
Solution Approach 2:
The power conversion system is segmented into distinct functional blocks: the matrix converter handles AC/DC conversion with soft-switching, the decoupling capacitor specifically addresses the ripple problem, and the resonant tank performs the final power conversion. This segmentation allows each component to be optimized for its specific function without compromising the others.
2Object-affected harmful factors
If a decoupling capacitor is added to absorb double-line frequency ripple, then the harmful ripple is attenuated, but the device complexity increases due to additional switches and components
Solution Approach 1:
The decoupling capacitor is designed to serve multiple functions: it absorbs double-line frequency ripple, provides soft-switching conditions for the matrix converter switches, and maintains voltage stability during transient conditions. By making the added component multi-functional, the justification for the increased complexity is strengthened as each additional element provides multiple benefits rather than a single isolated function.
Solution Approach 2:
The decoupling capacitor circuit is merged with the existing matrix converter structure, sharing common components and control mechanisms where possible. The additional switches are integrated into the existing switching fabric, and the control algorithm unifies the management of all switching elements, reducing the operational complexity despite the increased hardware count.
3Manufacturing precision
If the converter is designed for single-phase operation with decoupling capacitor, then sinusoidal input currents and constant output power are achieved, but the adaptability to three-phase grid input is limited
Solution Approach 1:
The converter system is designed with dynamic reconfigurability, allowing the switching network to adapt its topology based on whether single-phase or three-phase input is detected. The control algorithm dynamically adjusts the switching patterns and decoupling capacitor engagement to optimize performance for the specific input condition, enabling the same hardware to deliver high-quality sinusoidal currents and constant power regardless of whether the source is single-phase or three-phase.
Solution Approach 2:
The matrix converter topology and control strategy are designed to be universal, capable of accepting both single-phase and three-phase inputs. The decoupling capacitor mechanism, while critical for single-phase operation to eliminate double-line frequency ripple, can be selectively engaged or disengaged based on the input phase configuration, allowing the system to maintain high input current quality and constant power output across different grid types.
Data Source
AI summary
A power converter arrangement for power conversion in a single-phase power network, where the power converter arrangement comprises an input filter coupled to a first phase terminal to receive a first AC voltage, the input filter being configured to filter the first AC voltage to provide an input voltage; an electrical switching network comprising an array of bidirectional switches and an output terminal, the array of bidirectional switches being configured to generate a switched voltage from the input voltage at the output terminal. The electrical switching network comprises a decoupling capacitor to reduce undesirable oscillations at the output terminal; and a resonant circuit configured to convert the switched voltage into a supply voltage for supplying a load.