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arXiv 2401.04799eess.SYcs.SY
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选择低频减载参数的基于优化的框架

Optimization-based Framework for Selecting Under-frequency Load Shedding Parameters

Waheed Owonikoko, Mazen Elsaadany, Amritanshu Pandey, Mads R. Almassalkhi

AI总结:

针对高可再生能源电网中低频减载(UFLS)忽略网络空间信息的问题,提出一种混合整数线性规划框架,通过优化UFLS设定点以最小化频率偏差和负荷切除,并在IEEE 39节点系统上验证了有效性。

摘要:

可再生能源的高渗透率导致电力系统惯量降低,且对功率不平衡的频率敏感度更高。此类系统在极端扰动下越来越容易发生频率崩溃。低频减载(UFLS)是最后手段的保护方案,通过切除负荷来阻止频率下降,充当紧急制动。当前优化UFLS设置和频率阈值的新兴努力大多与网络无关,忽略了网络空间信息。随着分布式能源(DERs)在高可再生范式中的普及,电网正变得更加双向,使得网络中某些位置对UFLS动作的效果不如其他位置。本工作提出一个混合整数线性规划,优化UFLS设定点(优先选择一个位置而非另一个),以最小化给定扰动下的频率偏差和负荷切除。该公式考虑了系统信息和不同网络位置的DER发电组合,提高了模型保真度。该公式还使用最少的二进制变量捕捉了UFLS相关的离散性质、实际时间延迟和死区,降低了问题复杂性。我们在动态IEEE 39节点系统上实证验证了该优化方法,性能指标包括频率最低点、稳态频率和总切除负荷。

英文摘要:

High penetration of renewable resources results in a power system with lower inertia and higher frequency sensitivity to power imbalances. Such systems are becoming increasingly susceptible to frequency collapse during extreme disturbances. Under-Frequency Load Shedding (UFLS) is a last-resort protection scheme and acts as an emergency brake by shedding load to arrest frequency decline. Current and emerging efforts to optimize UFLS settings and frequency thresholds are mostly network agnostic, ignoring network spatial information. With the prevalence of Distributed Energy Resources (DERs) in the high-renewable paradigm, the power grid is becoming more bidirectional, making some locations in the network less effective for UFLS action than others. This work proposes a Mixed Integer Linear Program that optimizes the UFLS setpoints (prioritizing one location over another) to minimize frequency deviation and load-shed for a given disturbance. The formulation considers system information and DER generation mix at different network locations, increasing model fidelity. The formulation also captures the discrete nature and practical time delays and deadbands associated with UFLS using a minimal set of binary variables, reducing problem complexity. We empirically validate the optimization approach on the dynamic IEEE 39-bus system for performance metrics, including frequency nadir, steady-state frequency and total load shed.

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。

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