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Simplified Approach for Frequency Dynamics Assessment of 100% Power Electronics-Based Systems

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Frequency behaviour of large power systems based on synchronous generation can be assessed using well-known simplified approaches based only the fundamentals of speed governing. In these methods, all generating units of a specific area are aggregated in one equivalent unit, displaying an average frequency behaviour of that area. Since the overall behaviour of the power system is changing with the increase of Power Electronics (PE)-based sources, the validity of these simplified approaches may be compromised. Based on the standard tools for Synchronous Machine (SM)-based systems, this paper proposes an equivalent one for the assessment of the frequency dynamics of 100% PE-based systems. In order to validate the approach, the 2-area 4-generator system was adopted as a case study. For a 100% SM-based and a 100% PE-based system, the frequency behaviour obtained with the simplified model was compared with that of the reference version simulated using EMTP-RV. It has been shown that these behaviours are consistent, presenting a good estimation of frequency dynamics indicators, even when the system presents heterogeneous values of inertia.

Author(s):

Guilherme Santos Pereira    
EDF / L2EP
France

Valentin Costan    
EDF
France

Antoine Bruyère    
L2EP
France

Xavier Guillaud    
L2EP
France

 

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