Vásquez Plaza, Jesús D.

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    Aggregated inverter-based generator model parameterization via online moving horizon estimation using a DER_A smooth mathematical representation
    (2023-12-08) Vásquez Plaza, Jesús D.; Andrade Rengifo, Fabio; College of Engineering; Tonkoski, Reinaldo; Ramírez Scarpetta, José M.; Irizarry Rivera, Agustín A.; Aponte Bezares, Erick E.; Department of Electrical and Computer Engineering; Lorenzo González, Edgardo
    This research proposes a smooth mathematical representation of the aggregated DER_A model. The proposed smooth mathematical representation uses a novel smooth function to represent the saturation function and further uses a proposed method to obtain a smooth dead-band function The impact of the use of smooth functions on the dynamics of the DER_A model states is experimentally presented, and it is also demonstrated by means of electrical signals that the proposed smooth mathematical representation can represent the dynamics of the aggregated DER_A model. This research also proposes a way for parameterizing the DER_A model by using a smooth mathematical representation that is also provided in this research. The proposed methodology involves the use of an online parameterization technique that works in parallel with the electrical system. The methodology consists of five sequential steps, in which each step entails the parameterization of a distinct segment of the DER_A model via the use of the moving horizon estimation technique. Certain steps may be omitted in the representation of a detailed system using the DER_A model, depending on whether it provides voltage support via reactive power or frequency support through active power. Simulation results on a power system with known parameters and a detailed system with many inverter-based generators with unknown parameters demonstrate the effectiveness of the proposed parameterization methodology. The online moving horizon estimation technique provides accurate estimates of the parameters and states representing the dynamics of the detailed system through the DER_Aaggregate model. The voltage, current, and power dynamics of the DER_A model parameterized with the proposed methodology follow with acceptable levels of accuracy the dynamics of the detailed system