Uso de supercondensadores para brindar soporte de frecuencia en una microrred aislada

Abstract

This article presents the practical implementation of a frequency control technique (virtual inertia) in an energy storage system based on supercapacitors (ESS-SC). The design of this proposal provides frequency support to a real isolated microgrid that integrates renewable generation sources (solar photovoltaic, 15 kWp), conventional synchronous generation (diesel thermal, 44 kVA), and energy storage systems (ESS-SC, 30 kW). The base case is a hybrid solar-diesel microgrid (typical situation of insular systems) operating in normal conditions. Frequency support tasks' effectiveness provided by the SAE-SC checks out, and the resilience of the microgrid are evaluated in terms of this variable. The experimental results show that the implementation of the proposal allows reducing the frequency fluctuations of the microgrid by 30%, representing a significant improvement in the quality of the electricity supply. The experiments were carried out in the Microgrid Laboratory of the Centro Científico, Tecnológico y de Investigación Balzay (CCTI-B) of the Universidad de Cuenca.