Estimation Method of Voltage Sag Frequency Considering Transformer Energization

Wang, Ying; Li, Shunyi; Xiao, Xianyong

doi:10.1109/tpwrd.2020.3041000

Cited by 16 publications

(6 citation statements)

References 29 publications

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“…im0, imr, ims and imp are the magnetizing current at each of these flux points. Table I shows typical ranges and settings of this study for magnetic characteristics of the GE transformer [16], [17].…”

Section: B Mechanism Of Transformer Saturationmentioning

confidence: 99%

Adaptive Anti-Saturation Control Design of Transformers in Converter-Based Grid Emulators

Li,

Zhao,

Hans

et al. 2024

IEEE J. Emerg. Sel. Topics Power Electron.

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Transformer saturation is a common issue in megawatt converter-based grid emulators (GEs) when emulating grid faults. This problem necessitates the use of anti-saturation control (ASC) with GEs. However, conventional ASC methods tend to distort the emulated grid voltage or even interact with the voltage control (VC) of GEs, causing instability of the system. This paper, thus, proposes an adaptive ASC method and superimposes its output command to both modulation and VC references, which not only alleviate transformer saturation with the lower output voltage distortion, but mitigate its adverse interaction with the VC of converter-based GEs. Experimental results confirm the effectiveness of the adaptive ASC.

show abstract

Section: B Mechanism Of Transformer Saturationmentioning

confidence: 99%

Adaptive Anti-Saturation Control Design of Transformers in Converter-Based Grid Emulators

Li,

Zhao,

Hans

et al. 2024

IEEE J. Emerg. Sel. Topics Power Electron.

View full text Add to dashboard Cite

show abstract

“…im0, imr, ims and imp denote the magnetizing current at each of these flux points. Table I shows typical ranges and settings of this study for magnetic characteristics of the GE transformer [16], [17].…”

Section: B Mechanism Of Transformer Saturationmentioning

confidence: 99%

Adaptive Anti-Saturation Control Design of Transformers in Converter-Based Grid Emulators

Li,

Zhao,

Hans

et al. 2023

Preprint

View full text Add to dashboard Cite

Transformer saturation is a common issue in megawatt converter-based grid emulators (GEs) when emulating grid faults. This problem necessitates the use of anti-saturation control (ASC) with GEs. However, conventional ASC methods tend to distort the emulated grid voltage or even interact with the voltage control (VC) of GEs, causing instability of the system. This paper, thus, proposes an adaptive ASC method and superimposes its output command to both modulation and VC references, which not only alleviate transformer saturation with the minimized voltage distortion, but mitigate its adverse interaction with the VC of converter-based GEs. Experimental results confirm the effectiveness of the adaptive ASC.

show abstract

“…When =0 and t=/ꞷ1, m has a maximum magnitude p=2rated +r. Since the saturation flux s of transformer is typically in the range of (1.15~1.4)rated [69], m>s can lead to the inrush current around 2~10 times of the rated current [70], which may trip the GE or even damage the power components. Depending on the ratio of R1/(L1+Lm), the natural decaying response of the dc flux and inrush current may take 20 s~90 s [71].…”

Section: B Cvg-side Transformer 1) Additional Taps For Overvoltage Em...mentioning

confidence: 99%

Power-Hardware Design and Topologies of Converter-Based Grid Emulators for Wind Turbines

Li,

Wang,

Zhao

et al. 2023

IEEE J. Emerg. Sel. Topics Power Electron.

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Power-electronic-based grid emulators (GEs) emerge as a favorable method for testing grid-code compliances of wind turbines (WTs), thanks to their full controllability and improved efficiency. To accommodate the increasing power and voltage levels of WTs, scalability becomes a critical requirement for the topologies of converter-based GEs. This paper identifies first the power rating of future GEs based on the system architecture and the evolution of WTs, followed by evaluating converter topologies of GEs for high scalability. Design considerations of power semiconductor devices, step-up transformers, dc chopper and dc capacitors are also discussed for existing and prospective GEs.

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Estimation Method of Voltage Sag Frequency Considering Transformer Energization

Cited by 16 publications

References 29 publications

Adaptive Anti-Saturation Control Design of Transformers in Converter-Based Grid Emulators

Adaptive Anti-Saturation Control Design of Transformers in Converter-Based Grid Emulators

Adaptive Anti-Saturation Control Design of Transformers in Converter-Based Grid Emulators

Power-Hardware Design and Topologies of Converter-Based Grid Emulators for Wind Turbines

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