Analysis of Synchronverter Self-Synchronization Dynamics to Facilitate Parameter Tuning

Dong, Shuan; Jiang, Jingya; Chen, Yu Christine

doi:10.1109/tec.2019.2945958

Cited by 18 publications

(6 citation statements)

References 21 publications

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“…IIDGs can be controlled to imitate synchronous generators (SGs) to restrain the inverter's insupportable actions by forming synchronverters [3]. An enhanced synchronverter is proposed in [4] without a dedicated unit to synchronize with the grid frequency and phase. Synchronverters have the attention of researchers from different perspectives.…”

Section: Introductionmentioning

confidence: 99%

Optimal Protection Coordination of Active Distribution Networks With Synchronverters

Pola

Azzouz

2022

IEEE Access

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Synchronverters are inverters imitating synchronous generators (SGs) to curb adverse impacts of traditional inverters on power networks. However, synchronverters may generate unlimited currents during faults. In addition, limiting the synchronverter's fault currents by hard limiters could malfunction directional overcurrent relays (DOCRs). Thus, this paper employs virtual-impedance fault current limiters (VI-FCLs) that preserve the synchronverter's voltage source model to guarantee a reliable operation of DOCRs. Also, an optimal protection coordination (OPC) scheme is developed to size the VI-FCLs and determine the DOCRs' settings in a decoupled manner. The proposed protection scheme determines the highest values of the VI-FCLs that correspond to bolted faults at the synchronverters' terminals. These conservative values are then relaxed by adaptively varying the VI-FCL based on the fault severity to enhance the DOCR sensitivity. Further, a short circuit calculation algorithm is formulated to incorporate the developed synchronverter with VI-FCL into an OPC program to determine the optimal settings of DOCRs that minimize the total operating time of all primary and backup relays. Case studies ensure the proposed protection scheme's effectiveness in reliably protecting a radial 9-bus Canadian distribution system and a meshed 14-bus system powered by synchronverters.

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Section: Introductionmentioning

confidence: 99%

Optimal Protection Coordination of Active Distribution Networks With Synchronverters

Pola

Azzouz

2022

IEEE Access

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“…Furthermore, synchronization process has proven to be more difficult in the case of distorted or unbalanced power systems [5], in presence of harmonics [6], in microgrids [7], in power systems with high presence of distributed generation [8], in wind turbine driven generators [9] or grid converters [10]- [11].…”

Section: Introductionmentioning

confidence: 99%

Instantaneous Specific Protection Method Against Faulty Synchronizations of Synchronous Machines

et al. 2021

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The probability of faulty synchronization of a generator is very small, but not impossible. The main cause of a faulty synchronization is due to wiring errors caused during maintenance or commissioning when voltage transformer and synchronizing equipment are connected or reconnected wrongly. Faulty synchronizations of synchronous generators cause overcurrent and high electromagnetic torque values that can severely damage, not only the generators their selves, but also prime movers and step-up transformers. Moreover, they produce disturbances on the power system such as power oscillations and voltage sags that can end up collapsing the system if it is not cleared quickly. Despite that, conventional synchronous generator protection systems have not a specific function against faulty synchronizations. This paper presents and analyzes a new and specific protection method against faulty synchronizations. The method is based on an instantaneous low setting overcurrent protection that is only activated during synchronizations. Once the synchronization ends, the protection gets disabled in order to allow the increase of the generator power output. Consequently, it minimizes the damages and the disturbance in the power system through rapid detection and tripping. The method has been successfully validated by computer simulations for a thermal power plant 362 MVA turbo-generator, and by experimental tests on a 5 kVA laboratory generation unit.

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“…Dong et al investigate a self‐synchronizing Synchronverter in Reference 15, where practical guidance on favorable controller settings to achieve fast self‐synchronization and well‐tuned parameters are provided. However, also here only, the inverter side is considered in the investigation.…”

Section: Introductionmentioning

confidence: 99%

Small‐signal modeling and tuning of Synchronverter‐based wind energy conversion systems

Høstmark

Ամին

2021

Int Trans Electr Energ Syst

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Summary The Synchronverter technique is an example of a virtual synchronous machine‐based control method for PWM controlled power electronic converters that enable converters to mimic the behavior of a synchronous generator (SG). It is based on the well‐established mathematical model of an SG and should equip converter connected generation with the capabilities of providing the grid with ancillary services such as frequency/voltage support due to the inherent capabilities of the SG. In this paper, the Synchronverter control method is applied to a wind energy conversion system (WECS) connected to the grid using back‐to‐back converters. The mathematical models of the control system for both the rectifier side and the inverter side are elaborated and used to derive the required transfer functions. A tuning procedure is proposed, using the transfer functions of the system, to enable a fast and easy adaption of the control method to power systems with different parameters. Simulations have been performed to validate both the functioning of the proposed tuning procedure and the ability of the WECS to provide the grid with ancillary services. The results are promising, showing the controllers yielding fast and accurate responses to contingencies and changes in power set‐points without steady‐state deviations.

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Analysis of Synchronverter Self-Synchronization Dynamics to Facilitate Parameter Tuning

Cited by 18 publications

References 21 publications

Optimal Protection Coordination of Active Distribution Networks With Synchronverters

Optimal Protection Coordination of Active Distribution Networks With Synchronverters

Instantaneous Specific Protection Method Against Faulty Synchronizations of Synchronous Machines

Small‐signal modeling and tuning of Synchronverter‐based wind energy conversion systems

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