Soft-Switched Three-Port DC-DC Converter With Simple Auxiliary Circuit

Faraji, Rasoul; Ding, Lei; Rahimi, Tohid; Kheshti, Mostafa; Islam, Md. Rabiul

doi:10.1109/access.2021.3076183

Cited by 34 publications

(23 citation statements)

References 35 publications

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“…Several TPC solutions with transformers, including the coupled inductor [6,[8][9][10][11], and transformers-less structures [12]- [24], have been proposed in the literature for standalone PV systems. The transformer-less TPCs usually have advantages of smaller volume, fewer components, lower cost, easier control and parameters design, and higher conversion efficiency [2].…”

Section: Introductionmentioning

confidence: 99%

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Transformerless High-Gain Three-Port Converter With Low Voltage Stress and Reduced Switches for Standalone PV Systems

Qin

Qian

Soon

et al. 2022

IEEE Trans. Power Electron.

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This paper proposes a high gain transformer-less three-port converter (TPC) for standalone photovoltaic (PV) systems. The TPC is designed and developed based on a dualinductor high gain two-port converter by utilizing one of the buffer capacitors to derive the third part for PV input. A hybrid pulse frequency modulation (PFM) scheme unified with a pulse width modulation (PWM) control strategy is adopted, which realizes the maximum power point tracking (MPPT) control, load voltage regulation, and bidirectional energy flow at the battery port. The proposed TPC offers the unique advantages of high voltage gain, continuous battery port current, reduced power semiconductors, lower voltage stresses, the common ground shared by all ports, low-cost gate driver, and small size of the rear-end inductor. The working principle, steady-state characteristics, small signal models and control method, including design conditions, are comprehensively analyzed. The correctness of the theoretical analysis is verified by developing a 300W experimental prototype, which shows the maximum efficiency is 97.7%.

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Section: Introductionmentioning

confidence: 99%

“…Moreover, the voltage spikes and EMI problems caused by leakage inductance discharge of high-frequency transformers are also eliminated [3]. Hence, the transformer-less TPCs show better characteristics for applications without electrical isolation or extremely high voltage gain requirements [8].…”

Section: Introductionmentioning

confidence: 99%

Transformerless High-Gain Three-Port Converter With Low Voltage Stress and Reduced Switches for Standalone PV Systems

Qin

Qian

Soon

et al. 2022

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

show abstract

“…Based on the method used to provide soft switching in non‐isolated multi‐input converters, these converters classified into three general categories: non‐isolated resonant multi‐input converters [36], non‐isolated multi‐input converters with active clamp [37]. and non‐isolated multi‐input converters with soft switching [38].…”

Section: Introductionmentioning

confidence: 99%

Analysis, design and implementation of a high step‐up multi‐port non‐isolated converter with coupled inductor and soft switching for photovoltaic applications

Taheri

Shahgholian

Mirtalaei

2022

IET Generation Trans & Dist

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In this paper, a new structure of a non‐isolated multi‐input converter is presented that is capable of generating high voltages to increase the efficiency of the converter, which uses a combination of a coupled inductor and a voltage multiplier cell. By combining these two methods, it is possible to use switches with low voltage stress and therefore low conductivity. This type of structure is suitable for photovoltaic (PV) applications. The proposed converter has two distinct phases for each input, which can be used to properly control the energy received from each source using two separate phases. The performance of the proposed converter depends on the charging or discharging mode of the energy storage system (ESS). To design a high step‐up non‐isolated multi‐input converter, first the structure and performance of the proposed converter are thoroughly investigated. The exact design method is presented for the correct operation of the converter and the simulation results for different modes of the converter operation are shown. Finally, in order to confirm the accuracy of the simulation results of the proposed converter, a laboratory sample of the proposed converter to supply a 400 W–400 V load is implemented and a comparison between the theoretical and practical results is performed.

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“…However, most of these isolated topologies, if used for the integration of SC, will suffer from gain problems related to high voltage and current stresses due to large variations in SC voltage. However, in some of the cases [41][42][43], irrespective of isolated or non-isolated type of topology, the system configuration does not allow the integration of low voltage energy storage to the PVS. In [44], a switch capacitorderived multiport converter was proposed to integrate a low voltage storage to the PVS; however, the same could not be suggested for the integration of SC, because, in cases in which switched capacitor-derived converters are used, the efficiency drops severely when the voltage gain moves away from the fixed nominal value.…”

Section: Introductionmentioning

confidence: 99%

PV-Supercapacitor Cascaded Topology for Primary Frequency Responses and Dynamic Inertia Emulation

et al. 2021

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Owing to rapid increase in PV penetration without inherent inertia, there has been an unremitting deterioration of the effective inertia of the existing power systems. This may pose a serious threat to the stability of power systems during disturbances if not taken care of. Hence, the problem of how to emulate Synthetic Inertia (SI) in PV Systems (PVS) to retain their frequency stability demands attention. Super Capacitor (SC)-based storage become an attractive option over the other energy storage types because of its high-power density, burst power handling capability, faster response and longer life cycle. Considering this, the authors here propose a novel PV-SC Cascaded Topology (PSCT) as a cost-effective approach to emulate SI by integrating a low voltage SC to a high voltage grid-connected PVS. The proposed PSCT helps in operating the SC as a voltage source rather than a current source. Thus, it eliminates the high gain requirements of the SC interfacing converters. The aim is to target two main frequency response services, i.e., Primary Frequency Response (PFR) and Synthetic Inertial Response (SIR), using a novel common control scheme, but without affecting any other energy intensive services. The authors introduced a Droop-Inspired (DI) method with an adjustable inertia constant to emulate dynamic inertia so that a wider range of Rate of Change of Frequency (RoCoF) values can be serviced with a limited storage. A very streamlined analysis was also carried out for sizing of the SC stage based on a simple Three-Point Linearization (TPL) technique and DI technique with a limited knowledge of the disturbance parameters. The whole system was initially validated in a MATLAB Simulink environment and later confirmed with the OPAL-RT Real-Time Simulator. The investigated response was subject to variation in terms of control parameters, changes in solar irradiance, grid frequency variation, etc.

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Soft-Switched Three-Port DC-DC Converter With Simple Auxiliary Circuit

Cited by 34 publications

References 35 publications

Transformerless High-Gain Three-Port Converter With Low Voltage Stress and Reduced Switches for Standalone PV Systems

Transformerless High-Gain Three-Port Converter With Low Voltage Stress and Reduced Switches for Standalone PV Systems

Analysis, design and implementation of a high step‐up multi‐port non‐isolated converter with coupled inductor and soft switching for photovoltaic applications

PV-Supercapacitor Cascaded Topology for Primary Frequency Responses and Dynamic Inertia Emulation

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