Generalized Formulation of Steady-State Equivalent Circuit Models of Grid-Forming Inverters

Autor(es)

Cunha, Vinicius C. ^{[1, 2]} ; Kim, Taehyung ^[1] ; Barry, Nicholas ^[1] ; Siratarnsophon, Piyapath ^[1] ; Santoso, Surya ^[1] ; Freitas, Walmir ^[2] ; Ramasubramanian, Deepak ^[3] ; Dugan, Roger C. ^[3]

Afiliação do(s) autor(es)

^[1] Univ Texas Austin, Dept Elect & Comp Engn, Austin, TX 78712 - USA

^[2] Univ Estadual Campinas, Dept Syst & Energy, BR-13083970 Campinas - Brazil

^[3] Elect Power Res Inst, Knoxville, TN 37932 - USA

• Tipo de documento: Artigo Científico
• Fonte: IEEE OPEN ACCESS JOURNAL OF POWER AND ENERGY; v. 8, p. 352-364, 2021.
• Citações Web of Science: 0

Resumo

This work proposes positive- and negative-sequence equivalent circuits of grid-forming inverters for steady-state analysis. The proposed models are especially attractive for performing long-duration voltage regulation analysis and short-circuit studies involving grid-forming inverters. Our proposed equivalent circuit models are based on the inverter's voltage and current control loops in the alpha beta and dq frames. For this reason, they operate according to prescribed control functions and specified impedances (i.e., filter impedance, current limiter block, virtual admittance block, and PI/PR controller block). The equivalent circuit model accuracy is validated by comparing system steady-state voltage and current responses obtained by detailed time-domain models in PSCAD/EMTDC to those by the equivalent circuit models implemented in steady-state load flow program (e.g., OpenDSS). Two distinct control structures implemented in the alpha beta and dq frames are used for the validation. Single line-to-ground and line-to-line-to-ground faults are simulated in a small islanded microgrid as well as the IEEE 34-node test feeder. Fault impedances varying from 0 to 5 ohms are simulated. We show that the equivalent models precisely replicate the steady-state response of the detailed time-domain models. (AU)

• Processo FAPESP: 16/08645-9 - Pesquisas interdisciplinares em redes inteligentes de energia elétrica
• Beneficiário: João Bosco Ribeiro do Val
• Modalidade de apoio: Auxílio à Pesquisa - Temático
• Processo FAPESP: 19/20186-8 - Estimação de topologia, parâmetros de linhas e estados de chaves em redes de distribuição de energia elétrica de média tensão via medidores inteligentes
• Beneficiário: Vinicius Carnelossi da Cunha
• Modalidade de apoio: Bolsas no Exterior - Estágio de Pesquisa - Doutorado
• Processo FAPESP: 17/10476-3 - Desenvolvimento de metodologias para integração em sistemas de gestão da distribuição na presença de fontes distribuídas de energia e medidores inteligentes
• Beneficiário: Vinicius Carnelossi da Cunha
• Modalidade de apoio: Bolsas no Brasil - Doutorado