Análise de estabilidade de microrredes CC utilizando critérios baseados em região proibida

Marenice M. de Carvalho; Isaías V. de Bessa; Renan Landau P. de Medeiros; Florindo A. C. Ayres Júnior; Iury V. Bessa; Luiz E. Sales e Silva; Vicente F. de Lucena Junior

doi:10.20906/CBA2022/3460

Marenice M. de Carvalho Departamento de Engenharia Elétrica, Universidade Federal do Amazonas, AM
Isaías V. de Bessa Departamento de Engenharia Elétrica, Universidade Federal do Amazonas, AM
Renan Landau P. de Medeiros Departamento de Engenharia Elétrica, Universidade Federal do Amazonas, AM
Florindo A. C. Ayres Júnior Departamento de Engenharia Elétrica, Universidade Federal do Amazonas, AM
Iury V. Bessa Departamento de Engenharia Elétrica, Universidade Federal do Amazonas, AM
Luiz E. Sales e Silva Departamento de Engenharia Elétrica, Universidade Federal do Amazonas, AM
Vicente F. de Lucena Junior Departamento de Engenharia Elétrica, Universidade Federal do Amazonas, AM

DOI: https://doi.org/10.20906/CBA2022/3460

Keywords: System stability, Nyquist criterion, Minor loop gain, DC microgrid, Impedance criterion

Abstract

DC microgrid systems can be represented by cascade converter systems. These types of systems are composed of constant power loads that can lead the system to instability. In this context, several stability criteria based on the forbidden region that evaluate the smallest mesh gain are used to assess the stability of the system. This work proposes to evaluate the stability of a cascade converter system against changes in the controller’s design. This evaluation was performed using the Nyquist diagram of the lowest loop gain of the system through Middlebrook stability criteria, gain margin and phase margin, and opposite argument.