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Design and implementation of modified SEPIC high gain DC-DC converter for DC microgrid applications
International Transactions on Electrical Energy Systems ( IF 2.3 ) Pub Date : 2021-04-27 , DOI: 10.1002/2050-7038.12921
Jayanthi Kathiresan 1 , Senthil Kumar Natarajan 1 , Gnanavadivel Jothimani 1
Affiliation  

In DC microgrids, power converters are essential for interconnecting and controlling power flow from the renewable sources such as solar PV, wind, fuel cell, and so on with the DC grid link. A lot of DC-DC power converters available in the literatures are used to boost the low voltage from the renewable sources to the high voltage and also to track the maximum power from these sources. To boost the output voltage, high gain converters are required. To increase the static gain of the converters, many techniques such as using voltage lift, switched capacitor, coupled inductor, and so on are used. This paper presents a novel high gain DC-DC converter that does not use the above techniques for voltage boosting. An inductive reactive element is added in series with a switch to boost the voltage gain. This inductor is connected in parallel with the source voltage when the switches are in ON position and in series with the source when the switches are in OFF position. The proposed converter is designed to produce the output voltage of 380 V for the input of 48 V. The converter is designed to handle the power of 1 kW. With the use of the voltage boosting element, a maximum voltage gain of 28 is achieved and the efficiency of converter is about 91.9%. The performance of the proposed converter is simulated and analyzed for various conditions such as variation in input voltage, reference voltage, and load power and also for motor loads. The experimental prototype model is also built and the hardware results are shown in this paper to validate the simulation results.

中文翻译:

用于直流微电网应用的改进型 SEPIC 高增益 DC-DC 转换器的设计与实现

在直流微电网中,功率转换器对于将太阳能光伏、风能、燃料电池等可再生能源与直流电网链路互连和控制电力流至关重要。文献中提供的许多 DC-DC 电源转换器用于将来自可再生能源的低压升至高压,并跟踪这些来源的最大功率。为了提高输出电压,需要高增益转换器。为了增加转换器的静态增益,使用了许多技术,例如使用电压提升、开关电容器、耦合电感器等。本文介绍了一种新型的高增益 DC-DC 转换器,它不使用上述技术进行升压。电感性电抗元件与开关串联添加以提高电压增益。当开关处于接通位置时,该电感器与电源电压并联连接,当开关处于断开位置时,该电感器与电源串联连接。建议的转换器旨在为 48 V 的输入产生 380 V 的输出电压。该转换器旨在处理 1 kW 的功率。使用升压元件,最大电压增益可达28,转换器效率约为91.9%。针对各种条件(例如输入电压、参考电压和负载功率以及电机负载的变化)对所提出的转换器的性能进行了仿真和分析。还建立了实验原型模型,并在本文中展示了硬件结果以验证仿真结果。
更新日期:2021-04-27
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