Filter Extracted Sliding Mode Approach for DC Microgrids

Abstract

The advantages offered by DC microgrids, such as elimination of skin effect losses, no requirement of frequency synchronization and high efficiency for power transmission are the major reasons that microgrids have attracted the attention of researchers in the last decade. Moreover, the DC friendly nature of renewable energy resources makes them a perfect choice for integration with DC microgrids, resulting in increased reliability and improved stability. However, in order to integrate renewable energy resources with the DC microgrids, challenges like equal load sharing and voltage regulation of the busbar under diverse varying load conditions are to be addressed. Conventionally, droop control with PI compensation is used to serve this purpose. However, this cascaded scheme results in poor regulation to large load variations and steady state errors. To address this issue, this paper presents a sliding mode control-based approach. Key features of SMC are its ease of implementation, robustness to load variations, and fast dynamic response. The system model is derived and simulated to analyze the stability and performance of the proposed controller. An experimental test bench is developed to demonstrate the effectiveness of SMC against modeled dynamics and is compared with the droop controller. The results show an improvement of 26% and 27.4% in the rise time and settling time, respectively. Robustness of the proposed scheme is also tested by switching it with a step load and an improvement of 40% has been observed.

PWM Based Fixed Frequency Equivalent SM Controller for Stability of DC Microgrid System

“…However, this technique is reported only for restive loads. Alternatively, a nonlinear sliding mode control (SMC) technique using a hysteresis relay is proposed in , Yasin et al, 2021. Switching action using hysteresis relay generates an average non-zero value for which voltage error cannot be eliminated.…”

A novel dynamic integral sliding mode control for power electronic converters

“…Advanced applications such as integration of renewable energy resources with microgrids require robustness and precise voltage control. [1][2][3][4][5] In the existence of parametric and internal uncertainties, conventional non-linear control techniques do not provide required robustness. [6][7][8] Therefore, the sliding mode control (SMC) becomes a good candidate for controlling such systems with unknown dynamics and uncertain parameters with external perturbations.…”