Multi-port Bidirectional Converter Research Articles

Design and Control of a Multiport Bidirectional Converter for Fuel Cell Range Extended Vehicles with On-board Solar Generation

Design and Control of a Multiport Bidirectional Converter for Fuel Cell Range Extended Vehicles with On-board Solar Generation

A Flexible Bidirectional Multiport Converter for Battery-Ultracapacitor Hybrid Energy Storage System in Electrified Vehicles

A Flexible Bidirectional Multiport Converter for Battery-Ultracapacitor Hybrid Energy Storage System in Electrified Vehicles

Analysis and implementation of multi-port bidirectional converter for hybrid energy systems

In this work, a novel multi-port bidirectional converter is proposed for energy storage in electric vehicles (EV). The proposed converter has the ability to work in both bidirectional step-up (boost) and step-down (buck) modes. There are three ports in the proposed structure that the energy can flow between them. The main features of the proposed converter are the low components count, the low peak voltage of the main switches and low losses. Moreover, only two power switches are utilized in the proposed converter, which makes it easy to transfer the power between the sources. The suggested converter can be worked in energy storage system (ESS) due to the ability of step-up and step-down operation principles. Thus, it can charge and discharge the ESS with high voltage conversion ratio. Besides, the low number of components is utilized in the suggested converter to provide a bi-directional feature that leads to a reduction in the overall cost of the system. In order to investigate the effectiveness of the proposed converter, a technical survey, mathematical calculation, and a comparison study with other existing structures have been introduced in this paper. Finally, to validate the performance of the proposed converter, a laboratory prototype is implemented with a 150 W output power rate at 50 kHz switching frequency 20 V and 12 V input voltages, efficiency about 94.11% in step-up mode and 94.46% in step-down mode.

Soft-Switched Single Inductor Single Stage Multiport Bidirectional Power Converter for Hybrid Energy Systems

A soft-switched nonisolated multiport bidirectional converter is proposed for hybrid energy system applications. The proposed topology improves the efficiency and expands the applications of the conventional three-port converter (TPC) by adding a soft-switching cell and a bidirectional power flow path from output to charge the energy storage device. Moreover, soft-switching conditions for all TPC switches in all operating modes are achieved. The topology uses one inductor that is shared by all power flow paths. Thus, power conversion in all operating modes is done in a single-stage and the conduction loss is reduced. To implement the soft-switching cell, coupled inductors are used to optimize the magnetic core and volume of the converter. Various converter operating modes are presented, and design considerations are discussed. Moreover, different control system operating modes are explained and designed in detail. Finally, a converter prototype to supply a 250 W–200 V load is implemented, and the theoretical analysis is validated by the experimental results.

High Voltage Gain Multi-port Bidirectional DC-DC Converter with an Effective Multi-loop Control Strategy for PV/Battery Integrated Systems

This study proposes a novel isolated bidirectional multiport converter (MPC) based on a switched-capacitor converter and a half-bridge converter with an effective control scheme for photovoltaic (PV) powered and battery buffered systems. The proposed power electronics converter interface integrates the converters to which the ports are connected with a battery coupled common dc busbar and high frequency transformer (HFT). Thus, the three-port converter is formed without any need for an additional converter to regulate battery power flow. In addition, to transfer power from a low voltage PV energy unit to the battery and load, a single switch DC-DC converter with high voltage gain is proposed. The power flow between the ports is controlled by an effective multi-loop control scheme that is able to perform a smooth transition between the loops. In order to validate the viability and effectiveness of the proposed MPC, a 3 kW proof-of-concept model has been developed with a 3 kW PV and 220 V 12 Ah battery. The performance of the proposed converter has been analyzed for different case studies, including dynamic operating and loading conditions.

WITHDRAWN: A high gain multi-port bidirectional converter with reduced voltage stress

Abstract The energy storage becomes an essential part to exploit the intermittent form of renewable resources more effectively. Further it is mandate for a battery source to have a built in port for charging and discharging phenomena. A novel idea on multi port non-isolated bidirectional converter (M-NIBC) is proposed and experimented for improved voltage gain and reduced voltage stress in this paper. M-NIBC topology is devised with four electronic switches with a freewheeling diode across each and moreover two inductors and three capacitors certainly make the passive circuitry operation. Energy derived from the regenerative braking is sufficient to charge the battery and it can be done through the feedback control of bidirectional power flow. The voltage is shared in the respective module and thereby the stress across the switch is minimized to an extent. The successive reduction in voltage stress controls the ON state resistance of the semiconductor device eventually. Voltage gain of the proposed M-NIBC is comparatively lower than the conventional cascaded bidirectional converter (CBC) during the charging cycle whereas it is relatively higher in discharging cycle. The proposed M-NIBC is configured in a simpler way to control and this approach is tested in the simulation laboratory for validating its novel performance under the charging and discharging cycles respectively.

Multiport Converter With Enhanced Port Utilization Using Multitasking Dual Inverters

With the development of renewable energy and electric vehicle technologies, a need for multiport DC/DC/AC converters with high power density and reliability has arisen. A dual inverter based bidirectional multiport converter with two dissimilar voltage DC ports and an AC port is presented. The converter is capable of processing up to 1.67, 1.41, and 1 p.u. of power through its main DC, auxiliary DC and AC ports respectively, while only using the semiconductor and magnetics effort of a DC/AC converter rated for 1 p.u. Analysis reveals that this is more than thrice and twice the power limits of the main and auxiliary DC ports respectively, compared to using two independent inverters with a three-winding transformer. Furthermore, the proposed converter is more efficient than the latter option. These benefits are due to the multitasking of inverters and the existence of single stage DC/DC and DC/AC power transfer mechanisms enabled by the use of a center tapped transformer. A control strategy using these two mechanisms, capable of independently controlling the power flows between ports is also presented. Independent inverter control is also possible, allowing power flow between the main DC and AC ports during the failure of a single inverter. These claims are verified through thorough analysis, extensive simulation and experimental results using a 3 kW prototype.

Efficient Multi-Port Bidirectional Converter With Soft-Switching Capability for Electric Vehicle Applications

In this paper, to solve the hard-switching operation problem and the lack of existing a bidirectional power flow path from output to the energy storage device of the conventional three-port converter, a new soft-switched bidirectional multi-port converter is proposed. A large number of switches, different power flow paths which vary in each operating mode, and changing the outputs and their power levels are some of the challenges to provide soft-switching conditions in multi-port converters. In the proposed converter, by changing the topology of the conventional three-port converter, the bidirectional power exchangeability between ports is provided. Moreover, a soft-switching cell is added, which can operate independently from the output power levels. Less number of components with low volume is one of the important features of this multi-port converter. Due to the soft-switching operation of the proposed converter, the size of passive components and heat-sink is reduced. In addition, by the use of coupled inductors in the soft-switching cell, only one magnetic core is used and thus, single-stage power conversion is achieved and conduction loss is reduced. In this paper, the converter operating modes are presented, and design considerations are discussed. Finally, a 200 W–200 V prototype is implemented, and the theoretical analysis is validated by the experimental results.

Performance of Multi Port Bi Directional Converter for Energy Management System

The focal intention of this work is to provide incessant power delivery to the load by finding out the accessible supply sources optimistically among the four sources namely solar, wind, battery and diesel generator. Depends up on the availability the sources can be connected in order to have a sustainable power system. Due to the abnormalities of energy sources Solar and Wind, energy storage units are required in order to provide the sustainable constant voltage to the load without any interruption. The five port convert is used to interface the Solar, Wind, Battery, Diesel Generator sources and the load. The circuit topologies of different boost converters are discussed in [1]. The five-port converter can make sense of bidirectional flow of energy between the source, storage medium and load. Also ensure the DC bus maintaining stable voltage [2].

A DC–DC Multiport Module for Integrating Plug-In Electric Vehicles in a Parking Lot: Topology and Operation

Today's life and industry are intimately dependent on the electric energy. This dependence in future will be still intensified, especially due to the appearance of electric-dependent vehicles overriding conventional fossil-fuel-based vehicles in the societies. Electric and hybrid electric vehicles (EVs) carry battery storages to store the electrical energy they need. The batteries have recharging and discharging capabilities. A parking lot hosting multiple EVs could be considered as important aggregators for them. In this paper, a novel dc-dc multiport (MP) bidirectional converter (MPBC) is suggested to function in a parking lot integrating EVs as either electric load or source of energy. The switching strategies of MPBC and power sharing flowchart are presented and then its operation in the presence of three plug-in EV batteries is studied through simulation and verified through experimental testbench.