Abstract
In low power energy storage systems, to match the voltage levels of the low-voltage battery side and high-voltage direct current (DC) bus, a high voltage gain converter with bidirectional operation is required. In this system, the cost effectiveness of the design is a critical factor; therefore, the system should be designed using a small number of components. This paper proposes a set of bidirectional converters with high voltage gain range based on the integration of the boost converter with a Ćuk converter, single ended primary inductor converter (Sepic), and buck-boost converter. The proposed converters consist of a small number of components with a high voltage gain ratio. Detailed comparisons are made with respect to the operating mode, number of components, voltage, and current ripple and efficiency. The efficiency of proposed converters are higher than the conventional converters in entire power range, and 6% higher efficiency can be achieved in large duty cycle by calculating loss analysis. To verify performances of the proposed converters, three 200-W prototypes of the converters are developed under the same experimental conditions. The results revealed that converter I exhibits the highest efficiency in the boost mode (92%) and buck mode (92.2%). The experimental results are shown to verify the feasibility and performances of the set of converters.
Highlights
Energy storage systems (ESS) with direct current (DC)–DC converters operating in bidirectional is indispensable in microgrids, electric vehicles (EVs), and transportation systems based on the renewable energy [1,2]
The set of converters benefit from a high voltage conversion ratio in the boost and buck modes
Detailed comparisons are made with respect to the operating mode, number
Summary
Energy storage systems (ESS) with DC–DC converters operating in bidirectional is indispensable in microgrids, electric vehicles (EVs), and transportation systems based on the renewable energy [1,2]. For most transformerless bidirectional converters [8,9,10,11,12,13], the high frequency loss is lower, the voltage gain ratio is relatively low. This attained a high voltage gain the Ćuk, Sepic, and buck-boost converters are presented in [23,24,25] This attained a high voltage ratio stressstress across the power switches. The the converters operate onlyonly in gain and ratiolow andvoltage low voltage across the power switches. A set of DC–DC converters operating in bi-direction with high voltage conversion conversionratio ratiobased basedon on[23,24,25]. In order to analyze the proposed converters, detailed comparisons made respect to operating mode, number of components, voltage and current ripple and efficiency.
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