低频AC传输升级，具有最佳频率选择
Low Frequency AC Transmission Upgrades with Optimal Frequency Selection
摘要：
在标准50或60 Hz以外的频率下运行选定的输电线路的优点很多，包括增加电力传输容量和更好地利用现有基础设施。虽然高压直流（HVDC）是迄今为止最成熟的例子，但在从海上风电到铁路系统和采矿的应用中，人们对低频交流（LFAC）输电产生了新的兴趣。在本文中，我们调查使用LFAC作为传输升级，并提出模型和分析方法，以确定最佳的频率选择。本文首先提出了一种以频率为变量的最优潮流模型，假设模块化多电平变频器用于变频。使用这个模型，我们分析LFAC作为一个嵌入式升级的传输系统，使用现有的线路。我们量化了改进的潮流控制和频率降低的系统范围内的优势，并发现LFAC升级实现了类似的，有时更好的结果相比，高压直流输电升级。最后，我们分析的因素，确定这些升级的传输线的最佳频率，我们证明了改变频率响应不同的系统拓扑结构和操作条件的好处。
英文摘要：
The advantages of operating selected transmission lines at frequencies other than the standard 50 or 60 Hz are numerous, encompassing increased power transfer capacity and better utilization of existing infrastructure. While high voltage DC (HVDC) is by far the most well-established example, there has been an emerging interest low frequency AC (LFAC) transmission in applications ranging from offshore wind to railway systems and mining. In this paper, we investigate the use of LFAC as a transmission upgrade and propose models and analysis methods to determine the optimal choice of frequency. The paper first presents an optimal power flow model with frequency as a variable, assuming modular multilevel converters for frequency conversion. Using this model, we analyze LFAC as an embedded upgrade in a transmission system using existing lines. We quantify the system-wide advantages from improved power flow control and frequency reduction and find that an LFAC upgrade achieves similar and sometimes better results compared with HVDC upgrades. Finally, we analyze the factors which determine the optimal frequency for these upgraded transmission lines, and we demonstrate the benefits of changing the frequency in response to different system topologies and operating conditions.
机构、总结、中文摘要均由AI分析而来，可能存在错误，请以论文正文为准。
