1. Stability evaluation of a multi-stage converter system considering a CPL connected.
- Author
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de Bessa, Isaías Valente, Medeiros, Renan L.P., de Carvalho, Marenice M., Ayres, Florindo A. de C., Chaves Filho, João Edgar, de Lucena, Vicente Ferreira, and Bessa, Iury
- Subjects
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ELECTRIC power , *CASCADE converters , *VOLTAGE regulators , *LINEAR matrix inequalities , *RENEWABLE energy sources , *SPEED limits - Abstract
The use of power converters to regulate voltage and power in electrical power systems has been attracting attention due to the increasing number of research and applications on renewable energy. The integration of these switched devices may cause instability and undesired oscillations depending on the operation conditions, such as when they feed constant power loads (CPLs). Therefore, this paper proposes an analysis of the effect of the power regulation in a multi-stage converter system made by buck-buck cascaded converters, in which the first converter operates as a voltage regulator and the second operates as a power regulator. To support that analysis, the region of attraction (ROA) is estimated based on convex optimization with linear matrix inequalities (LMIs) constraints considering the effect of the power variation and the voltage regulator dynamics. These regions are validated through tests in a simulated environment, showing that the trajectories initiated within those regions remain confined in those despite the CPL power variation disturbance. Finally, a case study for the experimental environment is presented. The power variation test is carried out and shows the efficacy of the stability analysis approach ratifying the simulation results. • In this paper, an LMI-based stability analysis for the microgrid operation point is presented considering the CPL effects. • The region of attraction (ROA) of a microgrid with CPL is estimated to ensure the operational stability conditions. • Analysis of the impact of the voltage regulation speed on the stability of the microgrid with a CPL whose dynamics are previously known. [ABSTRACT FROM AUTHOR]
- Published
- 2024
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