Novel Integrated Three-Port Bidirectional DC/DC Converter for Energy Storage System

Wu, Yu-En; Chen, I‐Chun

doi:10.1109/access.2019.2931591

Cited by 21 publications

(12 citation statements)

References 21 publications

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“…In [27], the transition between modes occurs after a delay of 0.3 s and the PV array is emulated by dc voltage source. In [28] & [29], threeport bidirectional DC/DC converters are proposed with new control strategy. However, transition between modes is not considered.…”

Section: Introductionmentioning

confidence: 99%

A Method of Seamless Transitions Between Different Operating Modes for Three-Port DC-DC Converters

Aljarajreh

Siwakoti

et al. 2021

IEEE Access

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This paper presents the design of three-port converters (TPCs) for smooth transitions (i.e., fast settling time, and no obvious overshoot/undershoot) of 7 distinctive operating modes, depending on sources and loads scheduling. Two viable converter configurations have been identified and selected for further analysis and design of PV-battery systems. Conventionally, mode transition is achieved by assigning specific switching patterns through feedback signals and appropriate control algorithms. This incurs a delay in the response and unavoidable noise in the circuit. Additionally, in TPCs, three voltage sensors and three current sensors are generally required for decision making in mode selection, where errors in sensors may lead to an inaccurate response. This paper presents a new control strategy where the number of switching patterns is significantly reduced to 3 patterns instead of minimum 5 patterns for existing reported topologies. Therefore, decisions are simplified so that the transition occurs naturally based on the power availability and load demand but not deliberately as in the conventional method. In addition, instead of six sensors, three voltage sensors and only one current sensor are required to achieve all the necessary operations, namely, MPPT, battery protection, and output regulation. Moreover, these sensors do not participate in mode selection decision, which leads to seamless and fast mode transition. In addition, this work considers two bidirectional ports as compared with only one bidirectional port in most reported topologies. This configuration enables both standalone and DC grid-connected applications. Experimental results are reported to verify the proposed solution.INDEX TERMS Auto-transition, battery, bidirectional converter, mode selection, photovoltaic system and three-port converter.

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Section: Introductionmentioning

confidence: 99%

A Method of Seamless Transitions Between Different Operating Modes for Three-Port DC-DC Converters

Aljarajreh

Siwakoti

et al. 2021

IEEE Access

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“…Due to the advantages, many studies are being carried out [24][25][26][27] and new topologies are being developed based on boostflyback converters [28][29][30][31][32][33][34][35].…”

Section: Introductionmentioning

confidence: 99%

Double boost‐flyback converter

Cardoso

Brockveld

Lazzarin

et al. 2020

IET Power Electronics

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A high-gain step-up non-isolated dc-dc converter is proposed in this study, named the double boost-flyback converter. The topology combines two conventional boost-flyback converters with input-parallel and floating-output connections. The new topology increases the static gain and reduces the input current ripple in relation to the conventional boost-flyback topology. The proposed converter has the potential to be used in low input voltage applications that require a high gain, such as systems powered by photovoltaic panels, fuel cells, electric vehicles, and low voltage batteries. This study provides details on the principle of operation, static gain, control strategy, design guide and experimental verification. A 1 kW prototype was designed and built for an input voltage of 48 V and an output voltage of 800 V, reaching a static gain of 16.67. The maximum efficiencies obtained were 94.6% at 70% of load and 93.9% at rated load.

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“…Faced with diverse voltage levels and variation ranges, BDCs can ensure the reliable connection between the dc bus and the energy storage devices such as batteries. In addition, BDCs can also transmit bidirectional power between the dc bus and the batteries [4]. Energy utilization rate is therefore improved by the implementation of peakclipping and valley-filling.…”

Section: Introductionmentioning

confidence: 99%

A Bidirectional LLCL Resonant DC-DC Converter With Reduced Resonant Tank Currents and Reduced Voltage Stress of the Resonant Capacitor

Wang

et al. 2020

IEEE Access

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In this paper, a bidirectional inductor-inductor-capacitor-inductor (LLCL) resonant dc-dc converter is presented. Compared with the conventional LLC, a parallel-connected inductors structure is employed into the resonant tank. By virtue of this unique resonant tank, LLCL exhibits the following desirable features: 1) good voltage gain regulation capability in bidirectional power flow applications; 2) zero-voltage-switching turn-on of the power switches in a wide load range; 3) compared with the other bidirectional LLC-type resonant converters, lower resonant tank currents and lower resonant capacitor voltage stress are achieved under the same working conditions. The topology derivation and operating principles of LLCL are shown, and the vital characteristics of LLCL are especially discussed. Moreover, based on battery applications in energy storage systems, in order to make the voltage gain range of LLCL meet the requirements while minimizing the resonant tank currents, a parameter design method is conducted. Finally, a 500-W prototype is established to verify the operating principles and design effects of the proposed converter. INDEX TERMS Bidirectional power transmission, energy storage system, isolated dc-dc converter, LLCtype resonant converter.

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Novel Integrated Three-Port Bidirectional DC/DC Converter for Energy Storage System

Cited by 21 publications

References 21 publications

A Method of Seamless Transitions Between Different Operating Modes for Three-Port DC-DC Converters

A Method of Seamless Transitions Between Different Operating Modes for Three-Port DC-DC Converters

Double boost‐flyback converter

A Bidirectional LLCL Resonant DC-DC Converter With Reduced Resonant Tank Currents and Reduced Voltage Stress of the Resonant Capacitor

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