Análise comparativa entre os sistemas delta-upqc e back-to-back operando como conversor bidirecional de interligação entre a rede elétrica e microrredes ca monofásicas

Abstract

This work presents the study and comparative analysis between two topologies of power converters, the Delta UPQC converter (Unified Power Quality Conditioner) and the Back-to-Back converter, acting as a bidirectional electronic interconnection converter (BIEC) to connect the electrical grid conventional to a single-phase AC microgrid. In this work, the power flow in the two topologies of BIEC will be evaluated, verifying the power processed by each of the converters that make up the BIEC, in addition to verifying the bidirectionality of the power flow, draining and injecting power in the conventional electrical grid. In the CCP (common coupling point) of the microgrid, linear and non-linear loads will be connected, in order to evaluate the energy quality indexes that BIEC can meet. Both BIEC topologies are formed by two single-phase full-bridge frequency inverters, connected to each other by the DC link, in which in the Delta UPQC topology it will operate in the dual compensation strategy, with the series converter operating as a current source and the parallel converter operating as a voltage source. Likewise, in the Back-to-Back topology, the converter connected to the power grid operates as a current source and the converter connected to the microgrid coupling point operates as a sinusoidal voltage source. The simulation and experimental results will be presented to evaluate and validate the operation of both topologies to meet the energy quality indices and the power flow between the conventional electrical grid and the AC microgrids, providing a basis for sizing the current source converters and voltage source.