Soft switching method for multiport DC/DC converters applicable in grid connected clean energy sources

Abstract

In this study, a novel soft switching method for multiport bidirectional DC/DC converter is proposed. As a case study, the design and performance of a grid connected photovoltaic system with battery backup storage are investigated. This test system is perfectly suitable for smart applications in the modern power systems. The soft switching (zero voltage switching (ZVS)) capability operates over a wide operating range, without the requirement of auxiliary circuits. This is seen as the main advantage of the presented method for controlling the DC/DC converter. A centralised control strategy, including maximum power point tracking, power flow management and interfacing with the utility are evaluated. Theoretical results are verified by simulation and experimental results for a three-port DC/DC converter.

A new topology for nonisolated multiport zero voltage switching dc‐dc converter

“…In Marchesoni and Vacca, 3 a nonisolated 3-port dc-dc converter is presented. Two multiport isolated dc-dc converters with soft switching capabilities are presented in Yao et al 17 and Ajami and Asadi Shayan 18 ; however, they suffer from input current ripples. However, all switches operate under hard switching condition, and there are considerable current ripples at input sources.…”

“…However, they need more number of switches, which increases the power losses. Two multiport isolated dc-dc converters with soft switching capabilities are presented in Yao et al 17 and Ajami and Asadi Shayan 18 ; however, they suffer from input current ripples. In Lin et al and Chen et al, 19,20 2 interleaved converters are presented to reduce the input current ripple in dc-dc boost converters, whereas the switches of these topologies are operated with hard switching techniques.…”

Disturbance Rejection Control Method for Isolated Three-Port Converter with Virtual Damping

“…Therefore, the corresponding average currents in each switching cycle can be derived as (7) and (8) respectively.ī…”

“…The demand for three-port converters (TPCs) in renewable energy generation systems is increasing due to the compact structure of these converters and their ability to handle demanded power synchronously [1][2][3][4][5]. The TPCs not only facilitate multifunctional and multidirectional regulation for electrical power transmission but also provide flexibility in power control and power density enhancement in power conversion systems [6][7][8][9][10].…”

An integrated four port bidirectional dc-dc converter for photovoltaic energy harvesting systems

“…Recently various topologies of multiport converters have been reported in the literature because of their increasing merits. They can be classified as nonisolated [8,9,10], fully-isolated [11,12,13] and partiallyisolated topologies [14,15,16].Partially-isolated topologies are gaining importance these days because of the simplified structure and improved power density features. The focus of this paper is mainly on the partially-isolated multiport topology which uses a single winding transformer to isolate multiple input ports with the load port.…”