DC-DC Converter Design

 

I am interested in the design of new DC-DC converters that circumvent limitations of traditional topologies. The main benchmark objectives are: high input-to-output voltage gains without transformers or extreme duty cycles, reduced current/voltage ripples, high efficiency and low cost. Some research objectives include:

  • Multilevel DC-DC converters

  • Switched capacitor and resonant converters

  • Interleaved converters

  • Quadratic (and exponential) converters

Modeling and control of DC-DC converters

New DC-DC converter topologies bring benefits but also significant challenges in terms of modeling and control. In many cases, the traditional theory of (averaging) modeling and (small and large signal) control design cannot be applied or their optimal performance cannot be preserved.

Some research objectives to address this problem include:

  • Modeling of switched-capacitor converters

  • Data-driven modeling and control

  • Nonlinear control based on energy dynamics

  • Stabilization in the presence of constant power loads

Renewable energy systems

Power converters are crucial for the integration of renewable energy. Current challenges and research directions include:

  • Full cell implementations (modeling, control, current ripple mitigation)

  • PV panel maximum power point tracking and minimum current ripple point tracking

  • Implementation of new power converter topologies

Micro-synchrophasors (uPMUs)

Micro synchrophasors have attracted an enormous interest due to their capability to measure phasors of voltages and currents with high accuracy, and due to their capability to exploit the use of modern data transfer and storage mechanisms . This technology is hence ideal to address pressing issues in distribution networks due to the high penetration of distributed (renewable energy) generation. Current research is focused on:

  • Fault detection and isolation

  • Control of distributed generation

  • Hosting capacity

  • Data-driven modeling and control

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Energy storage

Li-ion batteries and ultra-capacitors are the main focus of this research with applications to electric vehicles, grid support and micro grid implementations. Current research is focused on:

  • Modeling and state estimation of li-ion batteries.

  • Design and implementation of battery management systems.

  • Grid support and disturbance rejection via bidirectional power flow converters and ultra-capacitors.

Control theory

I am also interested in the development of control theory. In particular, in control techniques that have an application in the aforementioned areas. My current theoretical research involves:

  • Behavioral system theory

  • Stability of switched systems

  • Dissipativity theory

  • Data-driven control

  • Fractional order systems

  • Nonlinear control strategies