Abstract
This paper presents an event-triggering (ET) super-twisting sliding mode control (STSMC) for voltage regulation in a low voltage DC Nanogrid. The DC Nano grid consists of a solar panel, battery, and resistive loads. The solar panel is connected to the DC Nanogrid via a DC-DC boost converter. DC-DC boost converter used to track MPPT. P& O MPPT algorithm is used for MPPT tracking. The battery is connected to the DC Nanogrid via a bi-directional DC-DC converter. The purpose of the bi-directional DC-DC converter is to make power balance in the DC Nanogrid. The controller used for the bi-directional DC-DC converter is ET-STSMC. Resistive loads are connected to the DC Nanogrid viva DC-DC buck converter. Here DC-DC buck converters are used to regulate load voltage. PI controller is used for the DC-DC buck converter. The STSMC eliminates the chattering effect which is inherent in conventional sliding-mode control (SMC). Furthermore, STSMC eliminates the steady-state error. STSMC contains an integral term in its control law equation which reduces the steady-state error and improves the system accuracy. The complete design process of ET-STSMC and corresponding results under various operating conditions are presented in this paper.
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