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首页> 外文期刊>Electrical engineering >Backup power supply concepts for low-voltage microgrids with directly coupled or inverter-interfaced grid-forming generators
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Backup power supply concepts for low-voltage microgrids with directly coupled or inverter-interfaced grid-forming generators

机译：具有直接耦合或逆变器接口网格形成发电机的低压微电网的备用电源概念

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摘要

Due to the increasing number of distributed generation in distribution grids and because of the decreasing number of conventional power plants in the transmission grid, the European electrical power system loses inertia and, thus, stability margins decrease while the system's complexity rises. Therefore, new security concepts in case of a system blackout need to be developed to maintain the reliability of the electrical system in the future. This work investigates two backup concepts in a variable microgrid test environment: a black start concept and a voltage maintaining ("intercepting") concept. Based on an analysis of existing approaches, two types of grid-forming generators are analyzed: a directly coupled synchronous generator emulating a combined heat and power plant and an inverter-interfaced generator acting like a battery storage system. For the first time, this research work provides a comparison between both concepts for grid-forming generators. The results show that an inverter-interfaced generator has clear advantages in comparison to a rotating mass with respect to its control speeds, maximum overshoots and settling times. For a resilient backup, grid-forming inverters need to be short circuit proof to withstand the transformers' inrush currents. The intercepting concept requires a robust island detection method and a basic communication infrastructure in the microgrid.
机译：由于分布网格中的分布式发电的数量越来越多，并且由于传输电网中的传统发电厂数量减少，因此欧洲电力系统失去了惯性，因此，在系统的复杂性上升时，稳定性边距降低。因此，需要开发系统停电的新安全概念，以保持未来电气系统的可靠性。这项工作调查了可变微电网测试环境中的两个备份概念：黑色开始概念和电压保持（“拦截”）概念。基于对现有方法的分析，分析了两种类型的网格形成发电机：直接耦合的同步发电机，其模拟组合的热量和发电厂和作用类似电池存储系统的逆变器接口发生器。这项研究工作首次提供了网格形成发电机的两种概念之间的比较。结果表明，与其控制速度相比，逆变器接口发生器与旋转质量相比具有明显的优点，最大过冲和沉降时间。对于弹性备份，格栅形成逆变器需要短路，以承受变压器的浪涌电流。拦截概念需要一种强大的岛检测方法和微电网中的基本通信基础设施。

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