基于频率影响因素的低频减载策略
Under-frequency Load Shedding Strategy Based on Frequency Influence Factors
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摘要: 频率稳定是电力系统稳定性的重要内容之一,而现有的分析方法尚不能分析各个负荷对频率的影响。因此,文中将电力系统动能定理和潮流追踪算法相结合,提出了一种频率影响因素分析方法。基于这种分析方法提出了一种低频减载策略,根据故障发电机会减少对负荷供电的特性,构造出负荷切除因子,对特定的负荷进行切除。在IEEE 10机39节点系统中的仿真分析表明,所提出的低频减载方法能够有针对性地切除与故障发电机相关的负荷,有利于频率的快速恢复。Abstract: Frequency stability is one of important power system stability topics.The impacts of loads on the frequency can not be fully revealed with current frequency analysis methods.Therefore,a frequency factor analysis method based on the kinetic energy theorem and power flow tracing is presented.Based on this analysis method,an under-frequency load shedding strategy is designed.Load shedding factors are constructed assuming that the active power load supplied by the faulty generators will decrease,therefore specific loads can be shed accordingly.Simulation results on the IEEE 10-machine 39-bus system shows that the loads related to incident generators are shed specifically using the method proposed and it helps to quickly recover the system frequency.
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