Generalised analytical framework for the stability studies of an AC microgrid

Kallamadi, Manjunath; Sarkar, Vaskar

doi:10.1049/joe.2016.0045

Cited by 7 publications

(6 citation statements)

References 21 publications

(29 reference statements)

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“…In this way, the virtual resistor is parallel connect with the filter capacitor, as in Figure 2. Based on the open-loop transfer function of LCL network, Equations (3)- (5), the relationship between the output current Ig(s) and the reference current Iref(s) of the inverter can be obtained, as Equation (6):…”

Section: Modelling Of the Inverter With Virtual Resistor Controlmentioning

confidence: 99%

“…With the increasing concerns of traditional energy shortage, greenhouse gas emissions, environmental pollution problem and so on, applications of microgrid become popular [1,2]. The typical microgrid system contains traditional power grid and DG (Distributed Generation) system [3][4][5]. The technology of DG system has been developed rapidly [6,7].…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Enhanced Error-Free Current Control Strategy for Inverter with Virtual Resistor Damping

et al. 2018

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In microgrid, the grid-connected inverter current with the LCL (inductor-capacitor-inductor) output filter is amplified at certain frequencies. Using virtual resistor damping method can help suppress the amplification. By choosing an appropriate virtual resistor value, the model of the inverter current control loop is simplified as a 2 nd -order lowpass filter. Based on such simplified model, this paper proposes a design method of reference current compensation controller, which does not require decomposition of harmonic components. With the reference compensation, the inverter output current control precision is improved obviously. The simulation and experimental results verify the accuracy of the inverter simplified model and effectiveness of the reference compensation design method.

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Section: Modelling Of the Inverter With Virtual Resistor Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Modeling and Enhanced Error-Free Current Control Strategy for Inverter with Virtual Resistor Damping

et al. 2018

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“…In addition, the phase‐locked loop (PLL) is placed across the filter capacitor terminal for the purpose of better stability and modelling convenience. The block diagram of the PLL used can be found in [30]. All the dynamic models are appropriately corrected based on the chosen

d q

transformation matrix.…”

Section: Case Studymentioning

confidence: 99%

“…From a voltage or current phasor, the initial values of DQ components (with respect to the global or common reference frame [7, 30]) of the corresponding voltage or current quantity are obtained through the following relationships:

\bar{V} = \frac{v_{D}^{false(0 false)} - normalj v_{Q}^{false(0 false)}}{\sqrt{3}}

\bar{I} = \frac{i_{D}^{false(0 false)} - normalj i_{Q}^{false(0 false)}}{\sqrt{3}}

…”

Section: Case Studymentioning

confidence: 99%

Enhanced real‐time power balancing of an AC microgrid through transiently coupled droop control

Kallamadi

Sarkar

2017

IET Generation, Transmission & Distribution

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“…Hybrid power systems have more complex dynamics than conventional AC power systems [6][7][8] and new scenarios of instability have emerged due to the interaction among dynamics of interface converters and electromechanical dynamics. Consequently, there is a need for understanding the mechanisms that may lead hybrid power systems to instability.…”

Section: Introductionmentioning

confidence: 99%

Time scale stability analysis of a Hopf bifurcation in a wind–diesel hybrid microgrid

Pillco

Alberto

Oliveira

2020

IET Renewable Power Generation

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Microgrids and modern bulk power systems usually have multiple time scale dynamics, such as slow and fast dynamics. In this study, the stability of a wind-diesel hybrid microgrid is investigated to show a mechanism of system collapse caused by the interaction between fast dynamics of interface converters and slow electromechanical dynamics. This mechanism leads to a Hopf bifurcation of the fast subsystem due to slow changes in the variables of the slow subsystem and is completely understood by decomposing the stability analysis of the microgrid into the stability assessment of two simpler subsystems: the slow and the fast subsystems. The timescale method proposed in this study for stability analysis of the microgrid extends the existing proposals in the literature and is able to detect this kind of instability scenario, where the interaction between fast and slow subsystems is the cause of collapse, while the existing approaches, such as quasi-steady-state analysis, fail in detecting instability.

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Generalised analytical framework for the stability studies of an AC microgrid

Cited by 7 publications

References 21 publications

Modeling and Enhanced Error-Free Current Control Strategy for Inverter with Virtual Resistor Damping

Modeling and Enhanced Error-Free Current Control Strategy for Inverter with Virtual Resistor Damping

Enhanced real‐time power balancing of an AC microgrid through transiently coupled droop control

Time scale stability analysis of a Hopf bifurcation in a wind–diesel hybrid microgrid

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