Novel complex waveform generator for evaluation of HVDC station class surge arresters

Agrawal, S and Reddy, GN and Umanand, L and Reddy, BS (2024) Novel complex waveform generator for evaluation of HVDC station class surge arresters. In: Electrical Engineering .

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Abstract

High-voltage and high-frequency stresses comprising of AC and DC components are encountered across the surge arresters at various nodes in HVDC stations. There is a need to generate these stresses to evaluate surge arresters employed at different locations in the HVDC networks. In the present work, an attempt is made to develop complex waveforms using a novel single-stage DC�AC converter. The presented switched-mode converter is based on a coupled inductor which gives an extra degree of freedom to obtain a higher gain with the modulation in the duty ratio. Fixing the turns ratio of the coupled inductor, the duty ratio is appropriately modulated to generate the complex waveform of high frequency and high amplitude. The proposed converter offers a single-stage solution for DC�AC inversion using pulse width modulation, with fewer components, higher power density, and the ability to generate a frequency of 600 Hz. The detailed converter and controller design analysis is discussed in the present investigation. The breakdown operation of the surge arrester demands a massive short-circuit current from the source side, which may be difficult to obtain if a high-gain amplifier is used without proper protection. The presented switched-mode converter-based approach rectifies the issue of the short-circuit current during the insulator breakdown. A simulation study is performed to validate the circuit for both positive and negative buck-boost regions. Further, a hardware setup is developed to verify the generation of high-frequency and high-voltage complex waveforms. The developed converter could be widely used for insulation evaluation and condition monitoring of various high-voltage equipment. © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.

Item Type:	Journal Article
Publication:	Electrical Engineering
Publisher:	Springer Science and Business Media Deutschland GmbH
Additional Information:	The copyright for this article belongs to Springer Science and Business Media Deutschland GmbH.
Keywords:	Complex networks; Condition monitoring; Electric inductors; HVDC power transmission, Complex waveform generation; Coupled inductor; High frequency converter; High gain; High-gain high-frequency converter; Single stage; Single-stage DC�AC conversion; Surge arrester testing; Surge arresters; Waveform generation, Degrees of freedom (mechanics)
Department/Centre:	Division of Interdisciplinary Sciences > Interdisciplinary Centre for Energy Research
Date Deposited:	30 Aug 2024 11:49
Last Modified:	30 Aug 2024 11:49
URI:	http://eprints.iisc.ac.in/id/eprint/84922

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