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Wide-Area Oscillation Damping in Low-Inertia Grids under Time-Varying Communication Delays

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Wide-Area Control (WAC) can be efficiently used for oscillation damping in power systems. However, to implement a WAC, a communication network is required to transmit signals between the generation units and the control center. In turn, this makes WAC vulnerable to time-varying communication delays that, if not appropriately considered in the control design, can destabilize the system. Moreover, with the increasing integration of renewable energy resources into the grid, usually interfaced via power electronics, power system dynamics are becoming drastically faster and making WAC more vulnerable to communication delays. In this paper, we propose a design procedure for a delayrobust wide-area oscillation damping controller for low-inertia systems. Its performance is illustrated on the well-known Kundur two-area system. The results indicate that the obtained WAC successfully improves the oscillation damping while ensuring robustness against time-varying communication delays.

Author(s):

Sultan Alghamdi    
University of Leeds
United Kingdom

Uros Markovic    
ETH Zurich
Swaziland

Ognjen Stanojev    
ETH Zurich
Switzerland

Johannes Schiffer    
Brandenburg University of Technology
Germany

Gabriela Hug    
ETH Zurich
Swaziland

Petros Aristidou    
University of Leeds
United Kingdom

 

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