Review of multiport isolated bidirectional converter interfacing renewable and energy storage system

Abstract

<p>Multi port converters increasingly gain prominance in the recent past to interface renewable energy sources like photovoltaic cells, fuel cells with the load. Energy storage elements like battery and supercapacitors nd major place as an additional and alternate sources in systems with primary renewable energy sources to overcome its intermittency issues. As these energy storage element's charging and discharging cycles are to be controlled, an isolated bidirectional converter topology with transformer is used. The galvanic isolation provided by the high frequency ac link transformers in partly isolated and fully isolated topologies makes these converters most preferrable in high power applications like electric vehicles. A comprehensive review is performed on various three port partly isolated and fully isolated topologies addressed by dierent research groups. The key contributions on soft switching for reducing switching losses and improving overall converter efficiency with help of resonant elements are discussed. In addition, control strategies for power ow control with enhanced soft switching of partly isolated converters are highlighted. A summary of converter topologies is provided comparing power rating, device count, soft switching resonant elements and efficiency which gives an idea for selection of suitable topology for the desired system requirement.</p>

The assesement of the shunt active filter efficiency under varied power supply source and load parameters

“…However, when way #4 is applied, the placement of primary sensors at the source side allows the maximal level of the efficiency of voltage deviation correction to be reached compared with other algorithms and with the placement of such sensors at the PCC. It must be noted that the obtained results help to properly select a control way for shunt active filter control according to the given conditions of the filter's installation and application [48][49][50][51][52]. The obtained results have given an opportunity to develop the adaptive algorithm of the shunt active filter functioning under varied application conditions for automated power quality improvement.…”

“…That is why it is reasonable to detect the degree of this decrease under different application conditions and for the most widespread types of hybrid structures [35,43]. Also, one of the main ideas of the presented paper is to show the range in which the parameters Cdc, L, and Udc can be changed when the active filter is the part of the hybrid structure or when it is working under combined power supply conditions when the internal impedance of the power source is changed [45][46][47][48].…”

Duty ratio control ofthree port isolated bidirectional asymmetrical triple active bridge DC-DC converter

“…Multiport converters (MPC) are used in systems where more than two sources and loads are interfaced.The multiport converter has lower number of components compared to multiple two port converters; hence it is compact [1]- [3]. Multiport converters can be classified into three types based on the isolation of ports.…”

“…Multiport converters can be classified into three types based on the isolation of ports. They are, isolated, non-isolated and partially isolated MPC [2], [3]. In non-isolated MPC there is no galvanic isolation between any ports.…”

“…This reduces the size of the transformer and other magnetic components [2]- [4]. Isolated MPC topologies have been derived from corresponding two port topologies, such as, forward converters, push-pull converters and flyback converters [2], [3].…”