Single-phase self-synchronized synchronverter with current-limiting capability

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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“…Meanwhile, the steady-state power deviation has been nullified through a PI controller (see Fig. 10) [59], [60].…”

Section: ) Modified Single-phase Synchronvertersmentioning

confidence: 99%

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

et al. 2020

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“…In the literature, the output voltage

()(, \overset{false\to}{e})

is directly used as the VSC command signal. However, here, a current controller is used as an inner control loop with a fictitious reference current, called

i_{2}^{normal*}

To calculate this current, the VSC has been modelled in steady state as in [4, 11]:

(][, \begin{matrix} e_{d} - u_{g - d} \\ e_{q} - u_{g - q} \end{matrix}) = (][, \begin{matrix} 1em4pt \\ R_{12} & - ω_{s} L_{12} \\ ω_{s} L_{12} & R_{12} \end{matrix}) (][, \begin{matrix} i_{2 - d} \\ i_{2 - q} \end{matrix}),

where L 12 = L 1 + L 2 and R 12 = R 1 + R 2 to simplify definitions. Also, the filter capacitor has been neglected.…”

Section: Current‐controlled Synchronvertermentioning

confidence: 99%

“…This solution provides good results, but the synchronverter requires several cycles to be re‐synchronised with the grid when a voltage sag takes place. Younis et al [11] develop a single‐phase synchronverter that is capable of limiting the output current. The current reference is obtained by multiplying the synchronverter reference voltage by a virtual impedance.…”

Section: Introductionmentioning

confidence: 99%

Parallel current‐controlled synchronverters for voltage and frequency regulation in weak grids

Roldán-Pérez

Rodríguez-Cabero

Prodanović

2019

J. eng.

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“…According to the ISS property, it holds true that if initially satisfies the previous inequality. Since is one of the controller parameters ( ), by selecting (13) where is the maximum allowed RMS value of the inverter current, then (14) since and The previous inequality holds for any and for any constant positive . As a result (15) where is the RMS value of the inverter current, showing that the proposed controller maintains the current-limiting property below a given value .…”

Section: B Current-limiting Propertymentioning

confidence: 99%

“…This has motivated researchers to design self-synchronization methods as part of the controller of inverter-interfaced DERs [13], [14], [15]. The main reasons for removing the PLL is that PLLs are inherently nonlinear and they can degrade the response time and accuracy of the pre-synchronization process [16].…”

Section: Introductionmentioning

confidence: 99%

Current-limiting droop control with virtual inertia and self-synchronization properties

Paspatis

Konstantopoulos

2017

IECON 2017 - 43rd Annual Conference of the IEEE Industrial Electronics Society

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Abstract-In this paper a current-limiting droop control of grid-tied inverters that introduces virtual inertia and operates without a phase locked loop unit is proposed. The proposed controller inherits a self-synchronization function and can guarantee tight bounds for the inverter frequency. In addition, using nonlinear Lyapunov theory, it is analytically proven that the inverter current never violates a given maximum value. Compared to the original current-limiting droop controller, the maximum capacity of the inverter is utilized at all times using the proposed strategy, even under grid faults. It is also proven that the proposed controller significantly reduces the resonance problem of the LCL filter. Extended simulation results are presented to verify the performance of the proposed controller under normal and faulty grid conditions.

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Single-phase self-synchronized synchronverter with current-limiting capability

Cited by 12 publications

References 12 publications

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

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

Parallel current‐controlled synchronverters for voltage and frequency regulation in weak grids

Current-limiting droop control with virtual inertia and self-synchronization properties

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