Power converters play a pivotal role in forming modern renewable energy sources integrated power grids. Among all grid-forming converters, high step-up converters with great nonlinear dynamic responses and fault recovery abilities have been sought after and developed in recent decades. This study proposes a novel X-shaped switching network (X-net)-based high-step-up converter. Specifically, an X-shaped switching network is designed to realize energy conversion of the converter, which, different from traditional impedance networks, only comprises switches and diodes. With this radically new X-shaped network, the proposed X-net converter is able to realise additional voltage pumping and low capacitor stress, hence improving dynamic responses and system reliability. In this study, the theory, analysis and simulation and prototype experiments of the proposed X-net converter with additional voltage pumping are presented in detail. Extensive comparisons between the X-net converter and its traditional counterparts are also presented which verifies the superiority of the proposition. The proposed X-net based high step-up converter bears significant potential as future grid-forming converters.

功率转换器在形成现代可再生能源集成电网中起着关键作用。在所有形成网格的转换器中，近几十年来一直在寻求并开发具有高非线性动态响应和故障恢复能力的高升压转换器。这项研究提出了一种新颖的基于X形交换网络（X-net）的高升压转换器。具体地，设计X形开关网络以实现转换器的能量转换，该转换器与传统的阻抗网络不同，仅包括开关和二极管。借助这种全新的X形网络，提出的X-net转换器能够实现额外的电压抽运和较低的电容器应力，从而改善了动态响应和系统可靠性。在这项研究中，该理论 详细介绍了所建议的带有附加电压泵浦的X-net转换器的分析，仿真和原型实验。还对X-net转换器与传统转换器进行了广泛的比较，从而验证了该命题的优越性。提出的基于X-net的高升压转换器具有巨大的潜力，可作为未来的网格形成转换器。