The invention addresses the challenge of double line frequency energy in 1-ϕ operation of 3-ϕ-1-ϕ interoperable direct and indirect matrix converters. It proposes active power decoupling (APD) circuits that inhibit power pulsations using capacitors as energy storage elements. These APD circuits operate from the high-frequency AC (HFAC) link of the converters and are formed by repurposing redundant components of the 3-ϕ matrix converter during 1-ϕ operation, enhancing efficiency and stability.
Two topologies are proposed: a buck converter with a DC capacitor and a variant where the capacitor is connected to the low-frequency AC voltage neutral. The APD circuits improve power factor correction and harmonic elimination, suitable for bidirectional electric vehicle chargers and AC-DC converters. Key features include galvanic isolation via a high-frequency transformer, optimized component selection for minimized power loss, and soft switching conditions.
The invention can help realize efficient power management in AC-DC conversion systems by ensuring stable operation during 1-ϕ conditions and effectively managing power pulsations, ultimately enhancing overall system performance and reliability.
Type of IP
Faculty
Department
- Improved Energy Efficiency: Actively decouples and compensates for power pulsations, minimizing energy losses during AC-DC conversion, leading to efficient energy utilization and reduced power consumption.
- Enhanced Power Quality: Reduces harmonic distortions and voltage fluctuations, improving power quality and reliability for sensitive electronic devices, and decreasing the risk of equipment damage.
- Facilitates Converter Interoperability: Reconfigures redundant 3-ϕ converter components to enable 1-ϕ operation, supporting dual-mode operation for applications like EV chargers, allowing high power charging in 3-ϕ mode and standard charging in 1-ϕ mode.
- Ripple Power Compensation during 1-ϕ Operation: Utilizes APD circuits for managing pulsating 1-ϕ AC power by storing energy in capacitors, mitigating power pulsations effectively to enhance power quality and stability.
- High-Frequency AC (HFAC) Link Operation: APD circuits operate at the HFAC link of the overall converter, reducing component stress and improving power management efficiency.
- Two Proposed Topologies: Includes a buck converter with a DC capacitor in parallel to the HF isolation transformer and a variant with the capacitor connected to the low-frequency AC voltage neutral, providing versatile options for AC power pulsation compensation.
- High-Frequency Isolation Transformer: Incorporates a high-frequency transformer for galvanic isolation, ensuring minimal power loss during AC to DC conversion.
- Versatile Applications: Suitable for bidirectional EV chargers and AC-DC converters with HFAC links, ensuring efficient power management under fixed and variable power conditions.
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Renewable Energy, Electric Vehicles (EVs), Industrial Automation, Power Electronics, Energy Storage Systems
Renewable Energy, Electric Vehicles (EVs), Industrial Automation, Power Electronics, Smart Grids, Data Centers, Telecommunications, Energy Storage Systems