Cost‐efficient nonisolated three‐port DC‐DC converter for EV/HEV applications with energy storage

Abstract

Summary Electric vehicle (EV) systems are the promising future transportation system as they play a key role in reducing the atmospheric carbon emission, and it becomes the focal point of research and development in the current epoch. This paper presents the design and development of three‐port dc‐dc buck‐boost converter (TPB2C) applicable for EV. The main feature of the proposed converter is its ability to handle diversified energy sources of different voltage and current characteristics with high output gain. The designed single stage converter with reduced components count can be operated in buck, boost, and buck‐boost mode with partial bidirectional power flow capability. In addition, the TPB2C converter could provide buck and boost output simultaneously unlike its counterparts which can output either buck or boost output. In buck mode, the suggested topology charges the battery and thereby eliminates a separate battery management system. Roof top photovoltaic panel and battery are the two input sources for the suggested converter. A small‐signal model of the converter is developed using state‐space approach, and the steady‐state performance of the converter is analyzed comprehensively. The device level simulations carried out in MATLAB‐Simulink and the experimental laboratory prototype model are validated using a dSPACE1104 real‐time digital controller.

Mitigation of circulating current with effective energy management in low‐power PV‐FC‐battery‐microgrid

“…The development of parallel converters to share the load was initially evoked for high amplitude current values. 3 However, in recent days, they are used for maintaining constant current in sensitive loads like Electric Vehicle (EV) on-board battery chargers, 4 digital computers, unmanned planes, spying drones, etc. The converters engaged in parallel operation need to meet the following requirements: (a) voltage regulation, (b) load current sharing, (c) maximum power point tracking, (d) zero circulating current, (e) online dynamic control with self-regulating algorithm during transient conditions, etc.…”

A new dual‐input three‐winding coupled‐inductor based DC‐DC boost converter for renewable energy applications

“…A three‐port DC‐DC topology has been proposed for simultaneously interfacing a PV source, a battery storage, and a load in Reference16, however, without improving the voltage gain compared to the conventional boost converter and also high power components. A modified three‐port buck‐boost converter has been proposed in Reference17 that has a compact structure with reduced component count and has the ability to supply the load power even in the absence of any one of the two sources. In Reference18, a new three‐input DC‐DC converter integrates the PV, FC, and battery sources in a compact structure, but the circuit suffers from low voltage gain and non‐grounded terminal for the battery.…”

A Modified Topology of a High Efficiency Bidirectional Type DC–DC Converter by Synchronous Rectification

“…Obtaining a high voltage gain, by connecting the Cuk converter and Boost converter in parallel for providing continuous current operation with the help of a single power switch, is discussed in [16] and results in lesser voltage stress across the power switch and the diodes. A three port buck-boost converter is designed and developed in [17]; it has an ability to handle diversified energy sources of various current and voltage characteristics applicable for electric vehicles and provides a large gain value. An ultra-high efficiency 50 kW bidirectional DC-DC converter is designed and a high-precision efficiency measurement method using a regenerative approach is discussed in [18], which provides high efficiency under full load conditions.…”