Revista Eletrônica de Potência (Brazilian Journal of Power Electronics)

Palavras Chaves: Amortecimento de Ressonâncias, Conversores multiníveis, Filtros Ativos, Resistência Harmônica

Resumo

Este trabalho trata do amortecimento de propagação harmônica em linhas de distribuição, visando melhora na qualidade da tensão. A propagação harmônica ocorre devido às ressonâncias entre as impedâncias indutivas do sistema e bancos de capacitores utilizados em filtros passivos e compensadores de reativos, amplificando a distorção causada por cargas não lineares nas proximidades, e pode ser amortecida através do uso de filtros ativos emulando resistências harmônicas. Esta abordagem (ao invés do uso convencional dos filtros ativos shunt para diretamente compensar as correntes harmônicas) é muito atrativa para sistemas de distribuição, aonde as cargas não lineares estão distribuídas e inacessíveis.
A contribuição principal deste artigo é a implementação desta resistência harmônica em um equipamento de armazenamento de energia e suporte de rede como uma funcionalidade extra, sem necessidade de sensores adicionais.
Resultados experimentais são apresentados em uma bancada de testes.

Title: Implementation of harmonic propagation damping feature on a storage and grid support equipment

Keywords: Active Power Filters, Harmonic Resistance, Multilevel converters, Resonance Damping

Abstract

This work discusses harmonic propagation damping on distribution lines, aiming for better voltage quality. The harmonic propagation is due to resonances between the inductive impedances of the system and the capacitor banks installed in passive filters and reactive power compensators, amplifying the distortion caused by non-linear loads nearby, and can be damped with the use of active filters emulating harmonic resistances. This approach (instead of the conventional use of shunt active filters to directly compensate harmonic currents) is very attractive for distribution systems, where the non-linear loads are distributed and inaccessible.
The main contribution of this paper is the implementation of this harmonic resistance in an energy storage and grid support equipment as an extra feature, without the need of additional sensors.
Experimental results are presented in a test bench.

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