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Optimal Provision of Concurrent Primary Frequency and Local Voltage Control from a BESS Considering Variable Capability Curves: Modelling and Experimental Assessment

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This paper proposes a control method for battery energy storage systems (BESSs) to provide concurrent primary frequency and local voltage regulation services. The actual variable active and reactive power capability of the converter, along with the state-of-charge of the BESS, are jointly considered by the optimal operating point calculation process within the real-time operation. The controller optimizes the provision of grid services, considering the measured grid and battery statuses and predicting the battery DC voltage as a function of the current trajectory using a three-time-constant model (TTC). A computationally-efficient algorithm is proposed to solve the formulated optimal control problem. Experimental tests validate the proposed concepts and show the effectiveness of the employed control framework on a commercial utility-scale 720 kVA/560 kWh BESS.

Author(s):

Antonio Zecchino    
Distributed electrical systems laboratory - EPFL
Switzerland

Zhao Yuan    
Distributed electrical systems laboratory - EPFL
Switzerland

Fabrizio Sossan    
Centre for processes, renewable energies and energy systems
France

Rachid Cherkaoui    
Distributed electrical systems laboratory - EPFL
Switzerland

Mario Paolone    
Distributed electrical systems laboratory - EPFL
Switzerland

 

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