A Grid-compatible Virtual Oscillator Controller: Analysis and Design

Lu, Ming–Feng; Dutta, Soham; Purba, Victor; Dhople, Sairaj V.; Johnson, Brian

doi:10.1109/ecce.2019.8913128

Cited by 90 publications

(68 citation statements)

References 22 publications

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“…Finally, Fig. 9 (d) shows the control scheme proposed in [55], which emulates the dynamic of so-called Andronov-Hopf systems. The considered virtual oscillator model is described by the following equations [55]:…”

Section: Virtual Oscillator Control (Voc)mentioning

confidence: 99%

“…In fact, independently on the considered VOC implementation among those examined in this section, the equations of the VOC are represented by a set of two nonlinear differential equations for E p and ∆θ, as it is the case of the Van der Pol-type oscillator investigated in [49]- [51] (eq. ( 18)), or the Andronov-Hopf-based structure issued in [55] (eq. ( 23)).…”

Section: Virtual Oscillator Control (Voc)mentioning

confidence: 99%

See 1 more Smart Citation

Grid-Forming Converters: Control Approaches, Grid-Synchronization, and Future Trends—A Review

Rosso

Wang

Liserre

et al. 2021

IEEE Open J. Ind. Applicat.

407

149

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In the last decade, the concept of grid-forming (GFM) converters has been introduced for microgrids and islanded power systems. Recently, the concept has been proposed for use in wider interconnected transmission networks, and several control structures have thus been developed, giving rise to discussions about the expected behaviour of such converters. In this paper, an overview of control schemes for GFM converters is provided. By identifying the main subsystems in respect to their functionalities, a generalized control structure is derived and different solutions for each of the main subsystems composing the controller are analyzed and compared. Subsequently, several selected open issues and challenges regarding GFM converters, i. e. angle stability, fault ride-through (FRT) capabilities, and transition from islanded to grid connected mode are discussed. Perspectives on challenges and future trends are lastly shared.

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Section: Virtual Oscillator Control (Voc)mentioning

confidence: 99%

Section: Virtual Oscillator Control (Voc)mentioning

confidence: 99%

Grid-Forming Converters: Control Approaches, Grid-Synchronization, and Future Trends—A Review

Rosso

Wang

Liserre

et al. 2021

IEEE Open J. Ind. Applicat.

407

149

View full text Add to dashboard Cite

show abstract

“…The basic concept and its design is analysed in [33]. This power-related control can be formulated in time domain bẏ…”

Section: ) Virtual Oscillator Control (Voc)mentioning

confidence: 99%

On the Coupling of Power-Related and Inner Inverter Control Loops of Grid-Forming Converter Systems

Dokus

Mertens

2021

IEEE Access

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In the last decade, different control concepts for the synchronisation of voltage-controlled power converters have been proposed in order to form converter-based power systems. The interoperability of these grid-forming power controls is often analysed based on reduced-order models covering only the slow controls or modes. In this article, the coupling of the outer, power-related and inner, inverter outputrelated control of multiple grid-forming power converter systems is analysed, based on a minimal working example. The elementary study cases each consist of a different grid-forming converter coupled with an external (and passive) grid. Here, the investigated stability problems are already manifested in the simplest possible setup. The analysis of these coupling effects is performed by modelling the system in impedancebased, state-space and phase portrait-based frameworks. In particular, small coupling impedances, like short transmission lines or small short circuit impedances, can be challenging for the controller stability of gridforming converters while the inner controls can even enhance this issue. The impact of this phenomenon and the participating subsystems are identified in this work. Thus, recommendations concerning modelling techniques and their legitimate assumptions are given. Laboratory experiments validate the performed analysis by indicating a close correlation between analytical models and experimental results. INDEX TERMSCoupling effects, grid-forming power converter, power-related control, stability analysis, voltage control.

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“…When compared with VSM and droop, it does not require the computation of active and reactive power at the inverter output terminal. In Reference 20, the authors presented Andronov‐Hopf oscillator based VOC for both grid‐tied and standalone settings.…”

Section: Introductionmentioning

confidence: 99%

Implementation and comparison of droop control, virtual synchronous machine, and virtual oscillator control for parallel inverters in standalone microgrid

Gurugubelli

Ghosh

Panda

et al. 2021

Int Trans Electr Energ Syst

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Summary In recent times, renewable energy sources (RESs) have been potential alternatives over the conventional generation systems connected to the grid. The power electronic inverters are the principal media of interface for connecting the RESs to the utility grid system. This work is primarily focused on the comparative analysis of Droop, virtual synchronous machine (VSM), and virtual oscillator control (VOC) techniques for the parallel operated inverters in a standalone Microgrid (MG). Droop control emulates only the droop characteristics of synchronous machines such that the transient response of this controller is not significant. VSM imitates not only the droop characteristics of synchronous machines but also the swing equation. Therefore, VSM has a remarkable difference in the dynamic performance of the system. In droop and VSM, the feedback signals such as voltage and current are measured to calculate the averaged real and reactive powers. However, the VOC works on instantaneous feedback signals such that it achieves much faster synchronization and good power‐sharing. The philosophy of the proposed VOC is to control an inverter such that it emulates the behavior of a nonlinear dead‐zone oscillator. The performance analysis of the system with the aforementioned controllers has been studied based on MATLAB/Simulink and Opal‐RT digital simulation. From the comparative analysis, it is observed that the VOC gives a better performance compared to droop and VSM control. The experimental results show the efficacy of the proposed VOC control method.

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A Grid-compatible Virtual Oscillator Controller: Analysis and Design

Cited by 90 publications

References 22 publications

Grid-Forming Converters: Control Approaches, Grid-Synchronization, and Future Trends—A Review

Grid-Forming Converters: Control Approaches, Grid-Synchronization, and Future Trends—A Review

On the Coupling of Power-Related and Inner Inverter Control Loops of Grid-Forming Converter Systems

Implementation and comparison of droop control, virtual synchronous machine, and virtual oscillator control for parallel inverters in standalone microgrid

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