Critical Clearing Time Determination and Enhancement of Grid-Forming Converters Embedding Virtual Impedance as Current Limitation Algorithm

Qoria, Taoufik; Gruson, François; Colas, Frédéric; Denis, Guillaume; Prevost, Thibault; Guillaud, Xavier

doi:10.1109/jestpe.2019.2959085

Cited by 156 publications

(111 citation statements)

References 22 publications

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“…The large-signal stability of the post-fault synchronization process of grid-forming converters is analyzed in [25], which uses an adaptive virtual impedance for the current limitation. To enhance the transient stability, the adaptive droop gains based on the voltage amplitude is proposed.…”

Section: ) Current Limiting Controlmentioning

confidence: 99%

“…Proposal [10], [90] Switching to a grid-following converter [86] Modify outer power references during fault [87] Current limitation through virtual resistance [88] Disable outer power controllers and limit the current through virtual admittance [25] Adaptive parameters for droop controller and virtual impedance [89] Enhanced droop control for current limitation [85] Using voltage limitation to provide current limitation behavior, as explained in Section IV-B 2. However, the impacts of current limiting control schemes on the transient stability of grid-forming converters still remain as an open issue.…”

Section: ) Current Limiting Controlmentioning

confidence: 99%

“…Yet, the reactive power droop control loop can adversely affect the transient stability of grid-forming converters [24]. Differing from synchronous generators (SGs), the limited overcurrent capability of power converters necessitates the use of current limiting control [12], which imposes another constraint to the transient stability behavior of grid-forming converters [25].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Grid-Synchronization Stability of Converter-Based Resources—An Overview

Wang¹,

Taul²,

Wu³

et al. 2020

IEEE Open J. Ind. Applicat.

498

237

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This paper presents an overview of the synchronization stability of converter-based resources under a wide range of grid conditions. The general grid-synchronization principles for grid-following and grid-forming modes are reviewed first. Then, the small-signal and transient stability of these two operating modes are discussed, and the design-oriented analyses are performed to illustrate the control impact. Lastly, perspectives on the prospects and challenges are shared.

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Section: ) Current Limiting Controlmentioning

confidence: 99%

Section: ) Current Limiting Controlmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Grid-Synchronization Stability of Converter-Based Resources—An Overview

Wang¹,

Taul²,

Wu³

et al. 2020

IEEE Open J. Ind. Applicat.

498

237

View full text Add to dashboard Cite

show abstract

“…Fig. 10 shows two general approaches to implement a current limitation for the gridforming control: the Virtual Impedance (VI) [39]- [41] and the Current Saturation Algorithm (CSA) [42]- [44]. Both algorithms are recalled:…”

Section: B Current Limitation Controlmentioning

confidence: 99%

“…The fault clearance in 150ms results in a stable resynchronization, while, when the fault duration is higher, the angle diverges, which yields a transient instability. More details on the transient stability analysis of this phenomenon can be found in [41], [45], [48]- [50].…”

Section: Response To Large Events and Transient Stabilitymentioning

confidence: 99%

A PLL-Free Grid-Forming Control With Decoupled Functionalities for High-Power Transmission System Applications

et al. 2020

Self Cite

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This paper proposes a grid-forming control strategy with a generic implementation approach to meet the transmission system requirements asking for the massive integration of power electronic devices into the power systems. In this context, several grid-forming controls have been proposed in the literature either with or without a Phase-Locked Loop (PLL). The PLL-based techniques allow decoupling the different control functionalities (i.e. inertia emulation, frequency support, active power setpoint tracking in steady-state) while the PLL-free schemes, which aim to avoid the PLL drawbacks, create a compulsory coupling between the control functionalities. The proposed grid-forming control in this paper is able to decouple the control functionalities without any dedicated PLL, which makes it more advantageous compared to what have been already proposed in the literature. Since the power converters are exposed to the small and large grid events, the presented control has been tested in both situations. For the small grid events, a simplified small-signal model is developed to assess the active power and frequency dynamics. In case of large grid events, a current limitation algorithm is included to the control in order to protect the power converter. To deal with the transient stability issues linked to the current limitation and enhance the converter performance during the post-fault, a method based on adaptive inertia constant is proposed. To validate the overall approach, time-domain simulations (in Matlab-Simulink) and experimentations are performed. INDEX TERMS Active power regulation, current limitation, fast frequency response, grid-forming control, inertial effect, transient stability. This article has been accepted for publication in a future issue of this journal, but has not been fully edited. Content may change prior to final publication. Citation information: DOI 10.1109/ACCESS.2020.3034149, IEEE Access T. Qoria et al.: Preparation of Papers for IEEE TRANSACTIONS and JOURNALS Rc, Lc i gabc v gabc Rg, Lg

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Fault Control Strategy of Grid‐Forming Converter Considering the Voltage Support of Faulty Phase

Guo

Feng

Yang

2023

IEEJ Transactions Elec Engng

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The grid-forming converter (GFC) is used to regulate the voltage and frequency of a local grid. However, due to the limited current capacity, the GFC must actively modify its control strategy when a serious external fault occurs, thus to avoid the possible damage caused by overcurrent. This paper proposes a novel voltage reference generation method for GFC based on the external equivalent impedance magnitude (EEIM), which has the following merits: (i) the faulty phase currents and the non-faulty phase voltage can be controlled within their operational limits. (ii) The voltage reference unbalance factor (VRUF) of the GFC can be adjusted flexibly if necessary. Then, in order to achieve the optimal support effect for the faulty phase voltages, a two-stage GFC fault control strategy is proposed in this paper. In the first stage, the fault type is judged by computing and comparing the EEIM of each phase. In the second stage, the voltage reference mode is determined according to the fault type, and the VRUF is adjusted to its optimum value through a search algorithm. Simulation results based on Matlab/Simulink verify the effectiveness of the proposed GFC fault control strategy in terms of current limiting and faulty phase voltage support.

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Critical Clearing Time Determination and Enhancement of Grid-Forming Converters Embedding Virtual Impedance as Current Limitation Algorithm

Cited by 156 publications

References 22 publications

Grid-Synchronization Stability of Converter-Based Resources—An Overview

Grid-Synchronization Stability of Converter-Based Resources—An Overview

A PLL-Free Grid-Forming Control With Decoupled Functionalities for High-Power Transmission System Applications

Fault Control Strategy of Grid‐Forming Converter Considering the Voltage Support of Faulty Phase

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