论文标题
通过低频交流技术启用长距离传输线的地下
Enabling Undergrounding of Long-Distance Transmission Lines with Low Frequency AC Technology
论文作者
论文摘要
随着严重自然危害的越来越多的患病率以及电力线对野火的点火，许多电力系统计划人员正在考虑将高架线转换为地下电缆，以减轻与这些事件相关的风险。由于电缆的电容和损失，具有很大比例的地下电缆的系统可能会带来挑战，这些因素可能限制了关键区域的硬化潜力。低频AC（LFAC）传输解决了这些问题，因为降低频率均降低了电容的影响和损失的影响。本文为地下电缆提供了可易于频率的模型，并将其纳入开源最佳功率流量工具变量fliblefrequencyopf.jl。该模型和实现用于证明LFAC在涉及LFAC的两个多末端电缆升级的案例研究中，包括与HVDC的比较。结果证明了LFAC系统对功率流控制和减少损失的价值。
With increasing prevalence of severe natural hazards and the ignition of wildfires by power lines, many power system planners are considering converting overhead lines to underground cables to mitigate risks related to these events. Systems with a large proportion of underground cables can bring challenges due to the capacitance and losses of the cables, factors which may limit the potential for hardening in critical areas. Low frequency AC (LFAC) transmission solves these problems, as lowering the frequency decreases both the effects of capacitance and the losses. This paper presents a tractable frequency-dependent model for underground cables and incorporates it into the open source optimal power flow tool VariableFrequencyOPF.jl. The model and implementation are used to demonstrate the benefits of LFAC in a case study involving two multi-terminal cable upgrades with LFAC, including a comparison with HVDC. The results demonstrate the value of LFAC systems for both power flow control and reduction of losses.
