A Coordinated Droop Control Method Using a Virtual Voltage Axis for Power Management and Voltage Restoration of DC Microgrids

The connection of constant power loads (CPL) in a low power dc system leads to a reduction in the stability margin of the system. Most of the existing techniques increase the stability margin by modifying the controller for CPL or source converter at the cost of deterioration in the performance of converters. Few publications have suggested methods to determine the value of dc‐link capacitance required for stable operation of dc microgrid with CPL. These methods do not necessarily give the minimum possible capacitance as a solution. This paper suggests a method to determine the lower bound on the value of capacitor, for stable operation of dc system. A dc system with both linear and CPL loads is considered. Detailed mathematical analysis is used to determine the range of capacitance to ensure the stability of equilibrium point. Further, this paper discusses the effects of variation in linear loads on the selection of capacitor. The procedure of capacitor selection for a low power dc system is included. Using the real‐time digital simulator and a digital signal processor, controller hardware‐in‐loop based validation is carried out for the proposed approach.

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“…To ensure proportional power sharing among sources, they are controlled using droop controllers. The value of droop gain

d_{s}

depends on the source power capacity and value of voltage as discussed in [41].

\begin{matrix} true \\ right d_{s} = \frac{(V_{o} - v^{o u t}) v^{o u t}}{P_{c}} \end{matrix}

…”

Section: Proposed Selection Methodsmentioning

confidence: 99%

Selection of capacitance for stable operation of low power DC system with constant power loads

Islam

Anand

et al. 2020

IET Generation Trans & Dist

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“…To restore voltages and minimize voltage deviation, a coordinated droop control method using the virtual voltage axis, i.e., the voltage compensation term, was proposed in Ref. [6], and the effect of communication delay on the control effect was investigated. An adaptive droop control was proposed in Ref.…”

Section: Fig 1 Diagram Illustrating Typical Dc-mg Configurationmentioning

confidence: 99%

Comparative analysis on the stability mechanism of droop control and VID control in DC microgrid

Lin

Zuo

et al. 2021

Chin. J. Electr. Eng.

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Voltage resonance and fluctuation deteriorate the stability of DC microgrids (DC-MGs) and restrict their popularization. Conventional droop control cannot suppress voltage fluctuation and damp oscillations. Therefore, new control methods, namely, droop+filter control and virtual inertia and damping control, are proposed. These methods differ owing to the addition of low pass filter (LPF) and virtual inertia loop. In this study, the stability of these control methods is investigated comprehensively to understand their differences arising from the use of LPF and inertia loop as well as the underlying dynamic stability mechanism. The leading causes of voltage instability in DC-MGs regulated by droop control are first presented. Subsequently, control methods for solving this issue are compared and their simplified small-signal models are constructed. Based on eigenvalue analysis, the DC-MG is equivalent to a third-order system. Different control effects can be acquired by changing the control parameters and the location of the eigenvalues; furthermore, they can be used to understand the dynamic stability. Eigenvalue analysis can provide parameter design guidelines. Finally, the simulation results verify the validity of the theoretical analysis.

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“…The EIS sensor is immersed in a sample solution to form a capacitance structure and the capacitance of the structure changes [ 5 ] depending on the pH value of the contact liquid [ 6 ]. As the pH value changes, the flat band capacitance [ 7 ] of the EIS chip moves along the voltage axis [ 8 ]. Through the change of capacitance [ 9 ], the corresponding voltage change [ 10 ] can be measured according to the pH value (voltage-capacitance method).…”

Section: Introductionmentioning

confidence: 99%

Comparison of Sb2O3 and Sb2O3/SiO2 Double Stacked pH Sensing Membrane Applied in Electrolyte-Insulator-Semiconductor Structure

Kao

Chen

et al. 2022

Membranes

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In this study, electrolyte-insulator-semiconductor (EIS) capacitors with Sb2O3/SiO2 double stacked sensing membranes were fabricated with pH sensing capability. The results indicate that Sb2O3/SiO2 double stacked membranes with appropriate annealing had better material quality and sensing performance than Sb2O3 membranes did. To investigate the influence of double stack and annealing, multiple material characterizations and sensing measurements on membranes including of X-ray diffraction (XRD), X-ray photoelectron spectroscopy (XPS), and scanning electron microscopy (SEM) were conducted. These analyses indicate that double stack could enhance crystallization and grainization, which reinforced the surface sites on the membrane. Therefore, the sensing capability could be enhanced, Sb2O3/SiO2-based with appropriate annealing show promises for future industrial ion sensing devices.

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A Coordinated Droop Control Method Using a Virtual Voltage Axis for Power Management and Voltage Restoration of DC Microgrids

Cited by 29 publications

References 25 publications

Selection of capacitance for stable operation of low power DC system with constant power loads

Selection of capacitance for stable operation of low power DC system with constant power loads

Comparative analysis on the stability mechanism of droop control and VID control in DC microgrid

Comparison of Sb2O3 and Sb2O3/SiO2 Double Stacked pH Sensing Membrane Applied in Electrolyte-Insulator-Semiconductor Structure

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