Dynamic Analysis of Grid-Connected Droop-Controlled Converters and Synchronverters

Ferreira, Reginaldo Vagner; Silva, Sidelmo M.; Antunes, Hélio M. A.; Venkataramanan, G.

doi:10.1007/s40313-019-00482-x

Cited by 21 publications

(9 citation statements)

References 39 publications

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“…In general, a synchronverter is defined as a power-electronics-based inverter that converts a DC to an AC while emulating the dynamic behaviors of a conventional synchronous generator (SG) [29] . A synchronverter comprises a conventional DC-AC inverter [30] that includes an inductor-capacitor (LC) filter, electronic switching devices, and an electronic pulse width modulation controller [31] .…”

Section: Modeling Of Synchronvertermentioning

confidence: 99%

Fuzzy logic controller-based synchronverter in grid-connected solar power system with adaptive damping factor

Yap

Beh

Sarimuthu

2021

Chin. J. Electr. Eng.

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In recent years, renewable energy sources, specifically solar power systems, have developed rapidly owing to their technological maturity and cost effectiveness. However, its grid integration deteriorates frequency stability because of insufficient rotating masses and inertial response. Hence, a synchronverter, which is an inverter that mimics the operation of a synchronous generator, is crucial to interface solar power in a power grid. It stabilizes the power grid by emulating a virtual inertia. However, a conventional proportional-integral (PI)-based synchronverter is not equipped with an adaptive damping factor (D p ) or a digitalized smart controller to manage fast-responding solar inputs. Hence, a novel fuzzy logic controller (FLC) framework is proposed such that the synchronverter can operate in a grid-connected solar power system. In this study, D p is controlled in real time using an FLC to achieve balance between speed and stability for frequency error correction based on frequency difference. Results of four case studies performed in Matlab/Simulink show that the proposed FLC-based synchronverter can stabilize the grid frequency by reducing the frequency deviation by at least 0.2 Hz (0.4%), as compared with the conventional PI-based synchronverter.

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Section: Modeling Of Synchronvertermentioning

confidence: 99%

Fuzzy logic controller-based synchronverter in grid-connected solar power system with adaptive damping factor

Yap

Beh

Sarimuthu

2021

Chin. J. Electr. Eng.

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“…where the dynamics of d and q components of v C and i L are coupled, and the underlying dynamics is nonlinear. We use feedback linearization to decouple the inductor current dynamics in (17). That is, here we use u d i and u q i as control design signals and the actuation parameters {m d , m q } (see Fig.…”

Section: Vsi System and Its Dynamic Modelmentioning

confidence: 99%

“…where {v d C , v q C }, {i d L , i q L } and internal system signal θ1 , {u d i , u q i } are obtained from real-time measurements of voltage and current signals. From (17), it is clear that the resulting dynamics for d and q components of i L are linear and decoupled in terms of the new control variables u d i and u q i . In fact these dynamics are represented by identical transfer function given by Gc = îd…”

Section: Vsi System and Its Dynamic Modelmentioning

confidence: 99%

Control Design for Inverters: Beyond Steady-State Droop Laws

Askarian¹,

Park²,

Salapaka³

2021

Preprint

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This paper presents a novel control structure and control synthesis method for regulating the output voltage/frequency and power injection of DC-AC inverters. The traditional droop method offers attractive solution to achieve compromise between clashing power and voltage/frequency regulation objectives. However, it relies on use of nonlinear power variables through slow outer control loop. In this paper we formulate the traditional droop method as a feedback control problem based on static power-flow equations and show how neglecting the dynamics of inverter and transmission line restricts the attainable closed-loop bandwidth and stability and robustness margin. Then we introduce a mapping between power variables and current in dq frame under given PLL condition, allowing for replacing the fast acting current variables as a proxy for power. Consequently, we present a novel control structure and control synthesis method based on disturbance rejection framework, and demonstrate inherent droop like characteristics in underlying dynamics for special cases of resistive and inductive line. Moreover, we generalize the proposed control synthesis procedure to include a generalized complex line dynamical model and introduce concept of hybrid-sourced-intverter. Finally, we validate higher bandwidth and better transient performance of our proposed design through experimental validation.

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“…Although the original modelling has been carried out in abc reference frame, the small-signal modelling in the dq reference frame is recommended to compare the performance of synchronverter and vector control strategies. Moreover, the modelling of synchronverter in dq reference frame also offers a simple approach to design and analyse the performance of the controller [30].…”

Section: ) Empirical Modellingmentioning

confidence: 99%

“…Where the synchronverter strategy has enhanced the ancillary services provided by WES, like energy curtailment, power factor correction and power reserve [112]. [30], [105], [106], [ The offshore wind farms connected to the HVDC system are vulnerable to sub-synchronous resonance, resonance at harmonic frequencies and poor dynamic response due to the absence of rotating inertia. The absence of PLL and cascaded loops in synchronverter can reduce the potential interaction between them.…”

Section: ) Wind Electric Systemmentioning

confidence: 99%

Synchronverter: A Comprehensive Review of Modifications, Stability Assessment, Applications and Future Perspectives

et al. 2020

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The increase in the penetration of renewable energy sources (RES) has reduced the effective inertia of the power system dominated by synchronous machines. The reduction in inertia has paved the way to the development of inertia emulation techniques, which complements the increased penetration of RES. The synchronverter technology is one among the virtual inertia emulation techniques which resembles close to the synchronous machine. The advancements in control and adaptations of synchronverter for various applications demand a comprehensive yet critical review. Thus, the main objective of this paper is to present a critical review of synchronverter technology which could increase the inertial response of RES. A critical analysis of modifications made to original synchronverter and the stability assessment techniques is presented. The effect of parameter variation on stability and dynamic performance is brought out as a decision matrix by analysing the movement of eigenvalues presented in various works. Towards the end, a synoptic overview is presented to depict the research trend and emphasize the domain which requires further attention. Furthermore, a brief discussion of the research gaps perceived during the phase of review is presented to leverage future research in the field.

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Dynamic Analysis of Grid-Connected Droop-Controlled Converters and Synchronverters

Cited by 21 publications

References 39 publications

Fuzzy logic controller-based synchronverter in grid-connected solar power system with adaptive damping factor

Fuzzy logic controller-based synchronverter in grid-connected solar power system with adaptive damping factor

Control Design for Inverters: Beyond Steady-State Droop Laws

Synchronverter: A Comprehensive Review of Modifications, Stability Assessment, Applications and Future Perspectives

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