Generic Multi-Frequency Modelling of Converter-Connected Renewable Energy Generators Considering Frequency and Sequence Couplings

Frequency and sequence couplings can compromise the trustworthiness of multi-frequency models for converter-based systems. There have been effective attempts to address mainly by linearized averaged models. Only a few studies conducted on practical optimization such with enormous matrices experimental results. This paper provides generic theory coupling patterns proposes modelling method detect only main in domain converter-connected renewable energy generators. The proposed model is based empirical tests using small-signal perturbations adopting Fourier transform switching converter response. methodology are verified 7MVA grid emulator voltage perturbation 2MVA photo-voltaic converter. Accordingly, exist more forms, including multiples fundamental frequencies. To best our knowledge, frequency overlooked literature. Furthermore, mirror concept valid all included model. Besides, environment noise levels criteria selecting couplings.