Generalized Formulation of Steady-State Equivalent Circuit Models of Grid-Forming Inverters
| Autor: | Walmir Freitas, Vinicius C. Cunha, Roger C. Dugan, Nicholas Barry, Deepak Ramasubramanian, Piyapath Siratarnsophon, Taehyung Kim, Surya Santoso |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
TK1001-1841
Admittance Distribution or transmission of electric power Computer science sequence circuit model microgrids steady-state analysis TK3001-3521 Topology Fault (power engineering) Distribution systems Current limiting grid-forming inverter Production of electric energy or power. Powerplants. Central stations Control theory Equivalent circuit Voltage regulation Electrical impedance Voltage |
| Zdroj: | IEEE Open Access Journal of Power and Energy, Vol 8, Pp 352-364 (2021) |
| ISSN: | 2687-7910 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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