Design of High-Frequency Fast-Rise Pulse Modulators for Lifetime Testing of Dielectrics

Mathew, P.; Niasar, Mohamad Ghaffarian; Vaessen, Peter

doi:10.1109/tdei.2023.3296711

Cited by 3 publications

References 32 publications

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Design of a high‐frequency transformer based on amorphous cut cores for insulation breakdown testing

Lagerweij,

Niasar

2024

High Voltage

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Innovative test methods are required to keep up with the increased demand for insulation materials which can withstand the high‐frequency square‐wave voltages generated by power‐electronic equipment. Test systems using high‐voltage, high‐frequency transformers have proven versatile and easy to realise. The authors investigate the application of amorphous cut cores in such transformers. Analytical and numerical models for the transformer and its frequency response are developed, aiding the design process. An amorphous core‐based transformer is designed for 8 kVpk output at 100 kHz and compared to two previous designs based on ferrite cores. The frequency and pulse response, as well as the high‐voltage and thermal performance, are evaluated. The comparison shows that while the low parasitics of the amorphous‐based transformer allow for superior frequency response, they are unsuitable for long‐duration tests with high pulse repetition frequencies (25–100 kHz) due to increased core losses. The partial discharge inception and flashover voltage are comparable to the ferrite‐based transformers.

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Design of a high‐frequency transformer based on amorphous cut cores for insulation breakdown testing

Lagerweij,

Niasar

2024

High Voltage

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Power Density Limits of Propulsion Motor for Electric Aircraft: A Study on Insulation Thickness

Wang,

Dong,

Niasar

et al. 2024

2024 International Conference on Electrical Machines (ICEM)

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Design of Integrated Hybrid Configuration of Modular Multilevel Converter and Marx Generator to Generate Complex Waveforms for Dielectric Testing of Grid Assets

Ganeshpure,

Soeiro,

Niasar

et al. 2024

IEEE Open J. Ind. Electron. Soc.

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This article proposes a new configuration of a Modular Multilevel Converter (MMC) and a Marx generator to generate fast-rising impulse waveforms. This new configuration improves the capabilities of the MMC-based high voltage arbitrary wave shape generator to generate fast-rising impulse since the MMC topology faces many inherent limitations. Similar to the conventional superimposed circuit of the AC transformer or DC rectifier circuit with the Marx generator, three hybrid circuits of MMC and the Marx generator are introduced, where the most optimal choice is made considering the practical aspect of testing, such as the size, cost and the preparation time. Then, the detailed analytical study is performed on the Marx generator circuit and MMC circuit, and when both circuits are coupled together to deliver a complete guideline on choosing various system parameters when the impulse wave shape and the load capacitor are given. The concept of this new hybrid configuration is demonstrated with a scaled-down prototype where the impulse with a rise time of 1 µs is superimposed on different arbitrary wave shapes. Similarly, the MATLAB-Simulink simulation model validates the proposed configuration for a 200 kV DC link voltage and 67 submodules with the desired impulse performance.

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Design of High-Frequency Fast-Rise Pulse Modulators for Lifetime Testing of Dielectrics

Cited by 3 publications

References 32 publications

Design of a high‐frequency transformer based on amorphous cut cores for insulation breakdown testing

Design of a high‐frequency transformer based on amorphous cut cores for insulation breakdown testing

Power Density Limits of Propulsion Motor for Electric Aircraft: A Study on Insulation Thickness

Design of Integrated Hybrid Configuration of Modular Multilevel Converter and Marx Generator to Generate Complex Waveforms for Dielectric Testing of Grid Assets

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