Inherently Non-Pulsating Input Current DC-DC Converter for Battery Storage Systems

Abstract

With an ever-growing number of batteries being integrated into the electric grid, bidirectional converters with non-pulsating dc input current are required to replace the existing bidirectional converters so as to extend the lifetime of such dc power suppliers. Bidirectional DC-DC converters are increasingly used in a variety of applications including uninterruptable power supplies, electric vehicles and renewable energy systems. In this study, we propose a new topology of bidirectional dc-dc converter with inherently nonpulsating input current (NPIC), which is intended to be used for battery energy storage systems. With simple modifications from the conventional converters, the proposed NPIC converter has no inherent pulsating input current in the step-down (buck) mode under both continuous and boundary conduction modes (CCM and BCM), whereas in the step-up (boost) mode, the proposed NPIC converter retains the desired voltage gain. Underpinning theories, operating principles and steady-state performances are analyzed and presented in detail, which are then corroborated by simulation and experimentation. The proposed converter topology, with simple design principle and ease for implementation, is likely to have wide-ranging applicability in interfacing electrochemically functioned dc sources to modern power systems. INDEX TERMS Bidirectional dc-dc converter, non-pulsating input current, step-up mode, step-down mode, continuous conduction mode, boundary conduction mode.

A comparative analysis of non-isolated Bi-directional converters for energy storage applications

“…All these issues are assorted and may be mitigated by using non-Pulsating input current BDC (NPICBDC) [35]. The circuit diagram of the NPICBDC is shown in figure 3.…”

Fuzzy Based Interleaved Step-up Converter for Electric Vehicle

“…Once the battery packs have been decreased, the rated voltage [12][13][14] will be reduced as well. Due to a lack of capability, the single-phase interleaved converter is incapable of supplying sufficient voltage to the transmission system (electric motor) due to a lack of capability [15,16]. Among the topology's features is the incorporation of a three-phase interleaved boost converter, which assists in the downsizing of battery packs while also supplying sufficient voltage to the electric motor [17].…”

Multi-Objective Design of Output LC Filter for Buck Converter via the Coevolving-AMOSA Algorithm

“…With the three design objective functions analyzed in Stage 1, the multi-objective design problem can be summarized in (12), in which the P l_tot,max is set as 10W, f c,max is set as 700Hz, and V tot,max is set as 100cm 3 .…”

“…Buck converters are playing important roles in both industries and our daily life. In industry, Buck converters are applied in electric vehicles [1], renewable energy systems [2], and others [3] for power regulation and voltage conversion [4]. In our daily life, the applications of Buck converters are everywhere, such as portable electronic devices [5], power audio systems [6], photovoltaic systems [7], etc.…”