DC-DC converter with two energy storage devices for smart grid system: Experimental validation

2022 IEEE International Power and Renewable Energy Conference (IPRECON) Pub Date : 2022-12-16 DOI:10.1109/IPRECON55716.2022.10059543

Mohammad Afkar, Parham Karimi, R. Gavagsaz-Ghoachani, M. Phattanasak, S. Pierfederici

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Abstract

In a smart-grid system, several circuits and energy storage systems are used. Using supercapacitors are commonly found in such applications due to their excellent properties. However, since its rated voltage is relatively low, it must be connected in series, and also step-up bidirectional voltage converters are commonly utilized. This work proposes a three-level boost converter as a core element connecting in a modular manner. If non-ideal devices are used and/or asymmetrical switching signals for the switches are applied, the voltage across the output capacitors might be different. It can lead to a failed operation. An equalized voltage control method with the current loop control is proposed to ensure similar capacitor voltages. The energy control is applied for the output voltage. The proposed controllers are validated using MATLAB/Simulink and then implemented in dSPACE DS1202. The experiment results show that the supercapacitors can exchange power bi-directionally with load through the proposed converter.

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智能电网系统中具有双储能装置的DC-DC变换器:实验验证

在智能电网系统中，需要使用多个电路和储能系统。由于超级电容器具有优异的性能，因此在此类应用中通常使用超级电容器。但由于其额定电压较低，必须串联，通常采用升压式双向电压变换器。这项工作提出了一个三电平升压转换器作为核心元件，以模块化的方式连接。如果使用非理想器件和/或对开关施加非对称开关信号，则输出电容两端的电压可能不同。这可能会导致手术失败。提出了一种采用电流环控制的均衡电压控制方法，以保证电容电压相近。对输出电压施加能量控制。利用MATLAB/Simulink对所提出的控制器进行了验证，并在dSPACE DS1202上实现。实验结果表明，该变换器可实现超级电容器与负载的双向功率交换。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2022 IEEE International Power and Renewable Energy Conference (IPRECON)

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