Abstract
Bidirectional dc to dc converter is used as a key device for interfacing the storage devices between source and load in renewable energy system for continuous flow of power because the output of the renewable energy system fluctuates due to change in weather conditions. In electric vehicles also, bidirectional converter is used between energy source and motor for power supply from battery to motor. Thus, bidirectional dc to dc converters are getting more and more attention in academic research and in industrial applications. Bidirectional dc to dc converters work in both buck and boost mode and can manage the flow of power in both the direction between two dc sources and load by using specific switching scheme and phase shifted control strategy and hence generated excess energy can be stored in batteries/super capacitors. Therefore, the basic knowledge and classification of bidirectional dc to dc converters on the basis of galvanic isolation, the comparison between their voltage conversion ratio and output current ripple along with various topologies researched in recent years are presented in this paper. Finally, zero current and zero voltage soft switching schemes and phase shifted controlling techniques are also highlighted.
Highlights
The use of renewable energy resources has been increased to save the environment and remaining fossil fuel and the requirement of storing the energy is increased
This paper discusses the basic concept of bidirectional dc to dc converter, their classification based on galvanic isolation and various topologies such as interleaved converter and DAB converter
For power flow in isolated bidirectional dc-dc converter, phase shift technique is used such as single-phase shift technique (SPS), extended phase shift (EPS) technique, double technique (DPS) and triple phase shift (TPS) technique
Summary
The use of renewable energy resources has been increased to save the environment and remaining fossil fuel and the requirement of storing the energy is increased. In many applications like electric vehicles the need of interfacing of energy storage with load and source is increased for a reliable and efficient system. Bidirectional dc to dc converter is the main device used to interface the Battery and super capacitor as a storage device to increase the system reliability. In electric vehicle bidirectional dc-dc converters used for capturing the kinetic energy of motor and charging the battery during regenerative breaking by reverse flow of energy [1]–[5][6]. Are environment dependent so fluctuation of output power and sudden change in load demand makes this hybrid system unreliable so, the solution for this issue is use of storage system like battery, super capacitor etc. Different control strategies such as SPS (single-phase shift), DPS (double phase shift), EPS (extended phase shift) and TPS (triple phase shift) employed in IBDC for bidirectional power flow are highlighted
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