Instantaneous Symmetrical Component based Virtual Oscillator Control

Ghosh, Ritwik; Tummuru, Narsa Reddy; Rajpurohit, Bharat Singh

doi:10.36227/techrxiv.19152716.v1

“…To maintain the same X/R ratio throughout the operating range, the values of 𝑚 and 𝑛 are taken as the same 𝑚 = 𝑛 = 𝑘 (3) The active and the reactive power droop characteristic of a symmetrical component based VOC (S-VOC) is represented by [24] 𝜔…”

Section: A Selecting the Value Of Rv0 Xv0 M And Nmentioning

confidence: 99%

Dynamic Voltage Stiffness Control Technique for a Virtual Oscillator based Grid-forming Controller

Ghosh¹,

Rajpurohit²,

Tummuru³

2022

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“…The nested controller also can provide additional functionalities such as protection against large grid side transients. [23]. It is important to mention that short duration (3cycle -1min) voltage unbalance of 2-15% and a steady-state voltage unbalance of 0.5-5% are very usual in electrical power systems [24].…”

Section: Introductionmentioning

confidence: 99%

“…It is expected from the distributed energy sources that they will support the grid with reactive power in presence of unbalanced voltage sags [28]- [30]. In our last work [23] we have presented the Symmetrical Component based VOC (S-VOC) to address the issue. However, S-VOC alone can not provide all the system-level functionalities such as capacitor voltage control, over current protection.…”

Section: Introductionmentioning

confidence: 99%

A New Virtual Oscillator-Based Grid-Forming Controller with Decoupled Control Over Individual Phases and Improved Performance of Unbalanced Fault Ride-Through

Ghosh

¹

,

Tummuru

²

,

Rajpurohit

³

2023

IEEE Trans. Ind. Electron.

7

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Virtual Oscillator (VO) control is the latest and promising control technique for grid-forming and grid-supporting inverters. VO Controllers (VOCs) provide time-domain synchronization with a connected electrical network. At the same time, a VOC can incorporate additional nested control loops for meets the system-level requirements such as fault ride-through capability. However, existing VOCs have two limitations. Firstly, the existing VOC does not have decoupled control over individual phases. As a result, the performance of the existing VOC is not satisfactory in presence of unbalanced grid voltages. Secondly, the fault ride-through performance of the existing VOC under an unbalanced fault is not satisfactory. The power delivery at a healthy phase gets affected by the faulty phase. This paper has introduced a modified VO based system-level controller to overcome the limitations mentioned above. Systematic development of the proposed control architecture with analytical reasoning is presented. Simulation studies and hardware experiments are conducted for validation.

show abstract

A New Virtual Oscillator based Grid-forming Controller with Decoupled Control Over Individual Phases and Improved Performance in Presence of Unbalanced Fault Ride-through

Ghosh¹,

Tummuru²,

Rajpurohit³

2022

Preprint

0

View full text Add to dashboard Cite

Virtual Oscillator (VO) control is the latest and promising control technique for grid-forming and grid-supporting inverters. VO Controllers (VOCs) provide time-domain synchronization with a connected electrical network. At the same time, a VOC can incorporate additional nested control loops for meets the system-level requirements such as fault ride-through capability. However, existing VOCs have two limitations. Firstly, the existing VOC does not have decoupled control over individual phases. As a result, the performance of the existing VOC is not satisfactory in presence of unbalanced grid voltages. Secondly, the fault ride-through performance of the existing VOC under an unbalanced fault is not satisfactory. The power delivery at a healthy phase gets affected by the faulty phase. This paper has introduced a modified VO based system-level controller to overcome the limitations mentioned above. Systematic development of the proposed control architecture with analytical reasoning is presented. Simulation studies and hardware experiments are conducted for validation.

show abstract

Instantaneous Symmetrical Component based Virtual Oscillator Control

Abstract: S-VOC<br>

Cited by 3 publications

References 23 publications

Dynamic Voltage Stiffness Control Technique for a Virtual Oscillator based Grid-forming Controller

Dynamic Voltage Stiffness Control Technique for a Virtual Oscillator based Grid-forming Controller

A New Virtual Oscillator-Based Grid-Forming Controller with Decoupled Control Over Individual Phases and Improved Performance of Unbalanced Fault Ride-Through

A New Virtual Oscillator based Grid-forming Controller with Decoupled Control Over Individual Phases and Improved Performance in Presence of Unbalanced Fault Ride-through

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