Enhanced Distributed Non-Linear Voltage Regulation and Power Apportion Technique for an Islanded DC Microgrid

Abstract

There is a growing focus on exploring direct current (DC) microgrids in traditional power grids. A key challenge in operating these microgrids is ensuring proper current distribution among converters. While conventional droop control has been used to address this issue, it requires compensating for voltage deviations in the DC bus. This paper introduces an innovative distributed secondary control approach that effectively addresses both voltage restoration and current sharing challenges within a standalone DC microgrid. The distributed secondary control proposed in this study is integrated into the microgrid’s cyber layer, enabling information sharing between controllers. This distributed approach ensures reliability, even in the event of partial communication connection failures. The controller employs a fuzzy logic control approach to dynamically determine the parameters of the secondary control, resulting in an enhanced control response. Additionally, the proposed approach can handle constant power and resistive loads without specific requirements. Employing the Lyapunov method, we have derived adequate stability conditions for the proposed controller. The performance of the controller has been assessed using MATLAB/Simulink® models and validated with real-time experimental testing performed with a SpeedgoatTM real-time machine, considering five different test cases. The results indicated that the proposed control system is robust in achieving its control objectives within a DC microgrid, exhibiting fast response and minimal oscillations.

Virtual oscillator with delayed feedback for transient mitigation in inverter-based islanded microgrids

“…In addition to this, the proposed scheme commensurates voltage and frequency regulation values with control schemes involving metaheuristic algorithms for autonomous microgrids (Qazi et al2018). Moreover, the settling time achieved with the proposed delayed feedback scheme is comparable to the enhanced control for resistive loads achieved with the fuzzy logic approach reported in a similar investigation (Lasabi et al 2022). From the results of the current investigation, it can be deduced that the proposed method with delayed feedback can provide improved voltage and frequency regulation, without much complicated strategies involving physical or computational complexity.…”

A Holistic Approach to Voltage Profile Improvement and Power Loss Mitigation through Distributed Generation Placement and Sizing

“…The matrix also reveals that GA has the greatest proportion, which denotes a high proportion of vastly cited articles that combine GA with other widely used techniques like PSO to address the DGs placement and size issues. The matrix was built using articles that were published during the last decade [25][26][27][28][29][30]. In current scientific literature, most researchers have used single or hybrid algorithms for solving optimization problems relating to DG either by considering size, or location but no approach is present which considers these domains in combination and considering its impact on voltage profile and power losses.…”

Coordinated Hybrid Approach Based on Firefly Algorithm and Particle Swarm Optimization for Distributed Secondary Control and Stability Analysis of Direct Current Microgrids

“…The idea of microgrids emerged over a decade ago; however, numerous associated challenges have prevented its widespread adoption, making it the focus of current research efforts [10]. In the current body of literature, diverse types of microgrids have been employed, encompassing hybrid AC/DC, AC, and DC configurations [11,12]. Presently, DC-based systems are considered to be a better choice for microgrid operation.…”