Chair of Power Electronics

DFG Priority Program SPP 1984 - Robust Control Design of Converter-Interfaced Resources in Hybrid Electricity Grids under Consideration of Harmonic Stability

The project focuses on the accurate modeling, stability analysis and control of hybrid AC/DC distribution grids with high penetration of power electronics. The modeling of the converters is realized with high emphasis on the control system, investigating both grid following and grid forming converters with different synchronization strategies, including PLL, power synchronization and self-synchronization. A Harmonic Power Flow analysis is realized by using detailed models of the converters and their control system. The effect of the nonlinearities on the harmonic generation and propagation is investigated by using Linear Time Periodic models. The propagation of harmonics from ac side to dc side and vice versa is also investigated.

A dynamic stability analysis of power electronics-based power systems is carried out, by using accurate grid nonlinear models and eigenvalue analysis. The stability problems emerging from the eigenvalue analyses are addressed through robust control strategies both applied at converter level and at power system level. At converter level, the use of additional multivariable control feedback has been proposed to reshape the converter dynamics with high degree of freedom. At power system level, a centralized control can send control signal to the single resources and optimize the power grid operation, taking into account the communication delays.


 

Title Robust Control Design of Converter-Interfaced Resources in Hybrid Electricity Grids under Consideration of Harmonic Stability
Coordinator Prof. Marco Liserre
Contact Person M.Sc. Federico Cecati
Type DFG D-A-CH Project (Joint project with Switzerland)
Funding 330.000 Euros (CAU)
Partners École Polytechnique Fédérale de Lausanne
Duration 01.10.2017 - 30.09.2020
Homepage  
Keywords Hybrid distribution grids, stability assessment, time-domain modeling, synchronization, communication, validation approaches
Research

  • Our research is focused on the design of high efficient and reliable PWM-based power converter architectures (single-cell, multi-cell, multilevel), their modelling and control to exploit commercial as well as new power semiconductor devices with minimum over design.
    We develop controllers for electric drives and we are particularly skilled in the integration of renewable energy systems into the electric grid.
    Please discover our expertise looking to our recent projects.

    HEART - The Highly Efficient And Reliable smart Transformer
    Further Research Projects

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