Minimizing inverter self-synchronization due to reactive power injection on weak grids

Lentijo, Kathleen; Opila, Daniel F.

doi:10.1109/ecce.2015.7309818

Cited by 4 publications

(6 citation statements)

References 16 publications

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“…Compared to the just described steady-state approach, this method, as developed in [25], [27], [49], has the advantage of including the effect that the PLL has on the injected current, which is coupled to the PCC voltage. The inner current loop can be assumed to behave as a controlled current source provided the bandwidth, in general, is much higher than that of the PLL.…”

Section: B Quasi-static Large-signal Analysismentioning

confidence: 99%

An Overview of Assessment Methods for Synchronization Stability of Grid-Connected Converters Under Severe Symmetrical Grid Faults

Taul

Wang

Davari

et al. 2019

IEEE Trans. Power Electron.

278

157

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Grid-connected converters exposed to weak grid conditions and severe fault events are at risk of losing synchronism with the external grid and neighboring converters. This predicament has led to a growing interest in analyzing the synchronization mechanism and developing models and tools for predicting the transient stability of grid-connected converters. This paper presents a thorough review of the developed methods that describe the phenomena of synchronization instability of grid-connected converters under severe symmetrical grid faults. These methods are compared where the advantages and disadvantages of each method are carefully mapped. The analytical derivations and a detailed simulation model are verified through experimental tests of three case studies. Steady-state and quasi-static analysis can determine whether a given fault condition results in a stable or unstable operating point. However, without considering the dynamics of the synchronization unit, transient stability cannot be guaranteed. By comparing the synchronization unit to a synchronous machine, the damping of the phase-locked loop is identified. For accurate stability assessment, either nonlinear phase portraits or timedomain simulations must be performed. Until this point, no direct stability assessment method is available which consider the damping effect of the synchronization unit. Therefore, additional work is needed on this field in future research.

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Section: B Quasi-static Large-signal Analysismentioning

confidence: 99%

An Overview of Assessment Methods for Synchronization Stability of Grid-Connected Converters Under Severe Symmetrical Grid Faults

Taul

Wang

Davari

et al. 2019

IEEE Trans. Power Electron.

278

157

View full text Add to dashboard Cite

show abstract

“…In conventional systems, the frequency is allowed to vary based on the supply and load imbalance. There is a limitation for the frequency variation based on the international standards [20], [30]. Therefore, if an undesired frequency variation is detected in the system, then the protection system should act.…”

Section: Stability Assessment Of the Proposed Model For The Srf-pmentioning

confidence: 99%

“…The conservative case means that the system change happens instantaneously. It can be concluded from (19) and (20) that despite of the order of input deviation, if the proportional and integral gains are tuned appropriately so the Lyapunov inequalities are satisfied, then the system works in its stable condition. This means that if the damping term of the error is larger than the frequency change, then the system will stand stable.…”

Section: B Large-signal Stability Assessment Of the Srf-pll Considermentioning

confidence: 99%

“…A conservative solution to overcome stability problem is to modify system parameters during the frequency deviation. To do so, considering (20), if the input frequency changes with the velocity ofω, then the system should be able to damp it with a rate of K p V PCC ω −ω , which should be more than system change in order to keep the system stable. In this way, one can increase the damping factor, K p , during the transient.…”

Section: Design: Adaptive Tuning Of the Srf-pllmentioning

confidence: 99%

“…A nonlinear model of the PLL brings more accurate information about the system in comparison with the small-signal models [20]- [22]. In [20], a nonlinear model of the gridtied voltage source converter (VSC) is introduced. The largesignal model of the PLL, in addition to the grid side model, is used to determine the stability margin.…”

Section: Introductionmentioning

confidence: 99%

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Modeling and Adaptive Design of the SRF-PLL: Nonlinear Time-Varying Framework

et al. 2020

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Synchronous reference frame phase-locked loops (SRF-PLLs) are widely used in different technologies, such as wind turbines, electric vehicles, more electric aircraft, and motor drives, to estimate system's variables. The SRF-PLL is an adaptive notch filter that is used to estimate a sinusoidal signal's amplitude, phase angle, and frequency. However, when the input signal is subjected to a considerable variation or includes a significant noise, its stability and performance become challenging. In this paper, the stability of the SRF-PLL for substantial changes in the input signal's variables are investigated. To do so, the nonlinear time-varying (NTV) model of the system is proposed and is used for the large-signal stability assessment. Then, an adaptive tuning method, based on the proposed NTV model, is designed to improve its transient performance during and after the variation. Simulation and experimental results are used to validate the proposed method. INDEX TERMS Grid-connected voltage source converters, large-signal stability, phase-locked loops, rateof-change-of-frequency, synchronization.

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A framework for selection of grid-inverter synchronisation unit: Harmonics, phase-angle and frequency

Amin

Zulkifli

2017

Renewable and Sustainable Energy Reviews

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Minimizing inverter self-synchronization due to reactive power injection on weak grids

Cited by 4 publications

References 16 publications

An Overview of Assessment Methods for Synchronization Stability of Grid-Connected Converters Under Severe Symmetrical Grid Faults

An Overview of Assessment Methods for Synchronization Stability of Grid-Connected Converters Under Severe Symmetrical Grid Faults

Modeling and Adaptive Design of the SRF-PLL: Nonlinear Time-Varying Framework

A framework for selection of grid-inverter synchronisation unit: Harmonics, phase-angle and frequency

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