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 aspects of testing, such as the size, cost, and preparation time. Then, a detailed analytical study is performed on the Marx generator circuit and the MMC circuit, and 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 $\mu$ s is superimposed on different arbitrary wave shapes. Similarly, the MATLAB-Simulink simulation model validates the proposed configuration for a $200 \,\mathrm{k}\mathrm{V}$ dc link voltage and 67 submodules with the desired impulse performance.

中文翻译：

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模块化多电平转换器和 Marx 发生器的集成混合配置设计，生成用于电网资产介电测试的复杂波形

本文提出了一种模块化多电平转换器 (MMC) 和 Marx 发生器的新配置，以生成快速上升的脉冲波形。这种新配置提高了基于 MMC 的高压任意波形发生器生成快速上升脉冲的能力，因为 MMC 拓扑面临许多固有的限制。与传统的交流变压器或直流整流电路与Marx发生器的叠加电路类似，引入了MMC和Marx发生器的三种混合电路，其中考虑了测试的实际情况，例如尺寸、成本和准备时间。然后，对Marx发生器电路和MMC电路进行了详细的分析研究，并将两个电路耦合在一起，以在给定脉冲波形和负载电容器的情况下提供选择各种系统参数的完整指南。这种新混合配置的概念通过按比例缩小的原型进行了演示，其中上升时间为 1 的脉冲$\亩$ s 叠加在不同的任意波形上。同样，MATLAB-Simulink 仿真模型验证了所建议的配置$200 \,\mathrm{k}\mathrm{V}$直流链路电压和 67 个具有所需脉冲性能的子模块。