As the concept of DC power and energy delivery, whether it is applied to microgrids, distribution, facilities, or transportation systems, is increasingly applied, protection is a paramount concern. There is an increasing number of applications where DC distribution is not only a benefit but a necessary means of building up the electrical system. These applications cover the range of voltages, low voltage DC (LVDC), medium voltage DC (MVDC), and high voltage DC (HVdc), and with corresponding increases in power ratings. At the low end of the voltage/power range, applications include electric vehicles, remote households and communities, telecommunication, data centers, and electric vehicle (EV) charging stations. Emerging system applications having a large number of electronically controlled loads, such as electrified ships and aircraft and ultra-fast multi-EV charging stations are moving the demand for resilient DC power distribution into the high end of the LVDC range (1 kV) into the MW power range. Considering the growth of the renewable energy infrastructure and the dc backbone of source/load interfacing power electronic converters (PECs), the future movement toward MVDC power and energy distribution and delivery is inevitable. Considerable research and developments have been applied to the source and load interfacing PEC hardware, controls, and inter-compatibility in DC systems, with relatively little attention paid to eventualities of failures at points of PEC connection and inter-connection.

中文翻译：

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关于直流保护的客座社论特刊


随着直流电力和能源输送的概念越来越多地应用于微电网、配电、设施或交通系统，保护成为首要关注的问题。在越来越多的应用中，直流配电不仅是一种优势，而且是构建电气系统的必要手段。这些应用涵盖了低压直流 (LVDC)、中压直流 (MVDC) 和高压直流 (HVdc) 等电压范围，并且额定功率也相应提高。在电压/功率范围的低端，应用包括电动汽车、偏远家庭和社区、电信、数据中心和电动汽车 (EV) 充电站。具有大量电子控制负载的新兴系统应用（例如电气化船舶和飞机以及超快速多电动汽车充电站）正在将弹性直流配电的需求转移到 LVDC 范围的高端（1 kV）。兆瓦功率范围。考虑到可再生能源基础设施的发展以及源/负载接口电力电子转换器 (PEC) 的直流骨干，未来向 MVDC 电力和能源分配和输送的发展是不可避免的。大量的研究和开发已应用于直流系统中的电源和负载接口 PEC 硬件、控制和内部兼容性，而对 PEC 连接和互连点的故障可能性的关注相对较少。