A Generalized Formulation of Active Power Synchronization Based Control Algorithms for Grid Connected Converters

Rosso, Roberto; Engelken, Soenke; Liserre, Marco

doi:10.1109/iecon.2018.8591758

Cited by 7 publications

(4 citation statements)

References 15 publications

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“…Finally, the equivalence of the two synchronization loops of the VSM structures shown in Fig. 5 (d) and (e) has been proven in [33]. Indeed, by differentiating eq.…”

Section: • Synchronvertermentioning

confidence: 67%

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

Rosso

Wang

Liserre

et al. 2021

IEEE Open J. Ind. Applicat.

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545

156

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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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“…Finally, the equivalence of the two synchronization loops of the VSM structures shown in Fig. 5 (d) and (e) has been proven in [33]. Indeed, by differentiating eq.…”

Section: • Synchronvertermentioning

confidence: 67%

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

Rosso

Wang

Liserre

et al. 2021

IEEE Open J. Ind. Applicat.

Self Cite

545

156

View full text Add to dashboard Cite

show abstract

“…12. Different possible implementations of the parts composing the control have been discussed in [30], and therefore are not repeated here in the following. A further distinction within the VSM class has been proposed using the time constant of the response.…”

Section: Grid‐following and Grid‐forming Conceptsmentioning

confidence: 99%

Requirements for control strategies of grid‐connected converters in the future power system

Emanuel

Brombach²,

Rosso³

et al. 2020

IET Renewable Power Generation

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The increasing penetration of converter-based generation in many power systems around the world has sparked a discussion about how to operate these power systems with the usual levels of efficiency, reliability and cost-effectiveness. Current grid-following converter-based generators have proven to run stably in parallel to one another, even if there are thousands of them connected in a power system, and even in very small isolated power systems with extremely low system inertia. Discussions around the necessity of additional converter performance, usually under the 'grid-forming' and 'Virtual Synchronous Machines' concepts, have recently been transferred from the academic sphere to national and international industry fora. Formal discussions have started in Great Britain, in Germany and at ENTSO-E level. However, there is still a lot of uncertainty about the real and not simulated performance of grid-forming converters, whilst the needs case for requiring this radically different control method has not been adequately justified. With the present paper we raise key questions that will serve towards an objective discussion about power system needs, grid infeed technologies and their interaction. This section summarises the recent developments in the discussions around the control strategies needed for the future power system that is dominated by converter-based generation. The European Network of Transmission System Operators for Electricity (ENTSO-E) at a European level and National Grid Electricity System Operator (NGESO) in Great Britain spearhead the discussions, with the German SOs exploring the grid-forming concept but so far in a less formal context.

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“…It is however important to point out that the synchronverter is not the only control structure proposed in the literature based on the power synchronization mechanism of a SM. In [30], a generalized formulation for power synchronization-based control algorithms has been presented and the results shown in this paper can be extended to such generalized structure. Typical values of stator impedance of real SMs are generally much higher than the output impedance of standard converter filters.…”

Section: Possible Countermeasurementioning

confidence: 99%

Robust Stability Analysis of Synchronverters Operating in Parallel

Rosso

Engelken

Liserre

2019

IEEE Trans. Power Electron.

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Recent studies have shown how synchronization units of converters operating nearby may interact with each other, affecting the stability of the system. Synchronverters are able to self-synchronize to the grid without the need of a dedicated unit because they can reproduce the power synchronization mechanism of synchronous machines (SMs). Recently, the robust stability of a synchronverter has been investigated by means of structured singular values (SSV or µ-analysis).In this paper, µ-analysis is performed to investigate how the robust stability of a synchronverter is affected by the presence of another converter of the same type operating in parallel. It is demonstrated that the parallel operation of synchronverters reduces their robust stability and a possible solution is proposed, based on the implementation of virtual impedances in the control algorithm. An accurate state-space model of the system under study is developed by adopting the component connection method (CCM) and the robust stability analysis is validated against time-domain simulations in MATLAB/Simulink/PLECS and experimental results with a power-hardware in the loop (PHIL) test bench.

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A Generalized Formulation of Active Power Synchronization Based Control Algorithms for Grid Connected Converters

Cited by 7 publications

References 15 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

Requirements for control strategies of grid‐connected converters in the future power system

Robust Stability Analysis of Synchronverters Operating in Parallel

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