Application of Resonance Analysis to AC–DC Networks

Abstract

Medium to long-distance underground AC lines and both short-and long-distance HVDC are frequently integrated into network expansion plans. In conjunction with growing numbers of power electronic converters in the grid there is a rising risk related to the effects of harmonic currents. Resonance analysis should therefore be part of power system expansion planning. In this paper, network harmonic modeling and analysis are discussed, in particular power transformer and power converter frequency models are proposed. Frequency scanning and resonance mode analysis are compared and discussed. The changes in resonance response due to transmission network expansion are drawn. The methods are applied to the investigation of the impact of one link reinforcement, both AC and DC solutions, as well as the impact of the power transformer disconnection. The performed analysis allows to find the resonance location at each studied case. The frequency analysis methods presented in this paper enables to foresee network frequency behavior that is valuable for both network analysis and network expansion planning.

Swiss competence center on energy research FURIES - Overview and contributions in the area of power electronics and SmartGrids

“…This example illustrates that the frequency scan study for each node impedance is not straightforward. Resonance mode analysis results described in more details in [38] are therefore needed in order to identify relevant resonance modes and contributing nodes. The considered network changes lead to resonance peaks vanishing, additional peaks appearance, resonance amplitudes decrease and peaks shift shown in Table I.…”

Dynamic Modeling of HVDC for Power System Stability Assessment: A Review, Issues, and Recommendations

“…Having said that, the energy transfer between AC and DC within the converter produces unusual harmonics although the pulse firing system is under control. It becomes a more serious issue when those unrepresentative harmonics damage the resonant networks, causing the operating status of the HV DC/AC operation to become complex [125,126].…”

Estudo investigativo da análise modal aplicada a sistemas de distribuição frente às distorções harmônicas

“…Logo, pode-se citar o trabalho de Ayoubi, Hooshmand e Esfahani (2017), no qual este apresenta um novo índice de ressonância, com o intuito de contribuir para uma melhor alocação destes considerando uma alocação simultânea dos capacitores na rede como um todo. Este índice tem a finalidade de restringir os locais que serão alocados os bancos de capacitores, evitando que os mesmos levem o sistema a condição ressonância harmônica.EmGalland et al (2018), o estudo da ressonância harmônica está relacionado com a expansão das redes elétricas, voltadas para linhas de corrente alternada subterrâneas de médias e longas distâncias e linhas High Voltage Direct Currente -Corrente Contínua em Alta Tensão (HVDC) de curtas a longas distâncias.Pode-se citar também o trabalhode Eggenschwiler et al (2017), no qual se estuda as ferramentas aplicadas no estudo da ressonância harmônica tanto para sistemas de transmissão como de distribuição. Para os sistemas de transmissão os autores citam a tendência da implementação de redes subterrâneas, visto que estas possuem cabos com uma maior capacitância do que os utilizados nas linhas áreas e de poderem alterar as frequências de ressonância já existentes no sistema.…”