This study proposes a charging/discharging system of energy storage devices (ESDs) to regulate the voltage of a dc bus. The proposed charging/discharging system is formed by a zeta/sepic converter and a sliding mode controller (SMC). The SMC uses a single sliding surface to regulate the dc bus voltage for the three operating modes of the charger/discharger converter (charging, discharging, and stand-by) and for ESD voltages lower, equal, or higher than the dc bus voltage. This study includes the stability analysis of the SMC and a design procedure of the SMC parameters. The charging/discharging system is simulated in PSIM, where the results confirm that the proposed SMC regulates the bus voltage in charging, discharging, and stand-by modes for different operating points of the system. Finally, the proposed charging/discharging system was constructed for demonstrating the feasibility of the solution for real applications. Moreover, the experimental results obtained in such a platform put into evidence the accuracy of the proposed SMC in regulating the bus voltage in all the possible conditions: bus voltage lower, equal or higher than ESD voltage, and during charge, discharge, and stand-by modes of the ESD.

中文翻译：

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基于zeta / sepic转换器和滑模控制器的充电/放电系统，用于直流母线电压调节

这项研究提出了一种储能设备（ESD）的充电/放电系统，以调节直流母线的电压。所提出的充电/放电系统由zeta / sepic转换器和滑模控制器（SMC）组成。SMC使用单个滑动表面来调节充电器/放电器转换器的三种工作模式（充电，放电和待机）以及低于，等于或高于直流总线电压的ESD电压的直流总线电压。这项研究包括SMC的稳定性分析和SMC参数的设计程序。在PSIM中对充电/放电系统进行了仿真，结果表明所建议的SMC针对系统的不同工作点在充电，放电和待机模式下调节总线电压。最后，提出的充电/放电系统旨在证明该解决方案在实际应用中的可行性。此外，在该平台上获得的实验结果证明了拟议SMC在所有可能条件下调节总线电压的准确性：总线电压低于，等于或高于ESD电压，以及在充电，放电和静置期间-根据ESD的模式。