Effect of load models on angular and frequency stability of low inertia power networks

Effect of load models on angular and frequency stability of low inertia power networks
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负载模型对低惯性电网角度和频率稳定性的影响

DOI:
10.1049/iet-gtd.2018.5542
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发表时间:
2019
期刊:
IET Generation, Transmission & Distribution
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Adrees A
Adrees A
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本研究提出了一个彻底的分析的影响,负荷模型的频率响应,小,大扰动稳定的电力系统,以确定类型的稳定性表现出最敏感的负荷模型,并为每种类型的研究稳定性,以查明负荷模型,具有最坏的效果。分析表明,暂态稳定对负荷模型最为敏感。不稳定的情况下,每种类型的研究负荷模型的数量变化很大。负荷模型的影响随着同步发电机裕量的减小而放大。有功功率扰动后系统频率响应的结果表明,如果系统在高负载下以降低的一次频率响应运行,则恒定功率负载的影响可能是显著的。由于不确定性增加,可再生能源(RES)的高度集成增加了机电模式阻尼的变化,而高比例的感应电机可以大大降低区域间模式的阻尼,使稳定的模式在某些工作点不稳定。负载模型的影响已使用RES渗透率为30%和52%的68节点系统进行了说明。
This study presents a thorough analysis of the effect of load models on frequency response, small and large disturbance stability of the power system, in order to identify the type of stability exhibiting most sensitivity to load models, and for each type of studied stability to pinpoint the load model that has the worst effect. The presented analysis shows clearly that transient stability is the most sensitive to load models. The number of unstable cases varies considerably with each type of studied load model. The effect of the load model magnifies with the reduction in headroom of synchronous generators. The results of frequency response of the system following an active power disturbance demonstrate that the influence of constant power loads can be significant if the system is operating with reduced primary frequency response at high load. High integration of renewable energy sources (RES) increases the variation in the damping of electromechanical modes due to increased uncertainties, and a high proportion of induction machines can reduce the damping of inter‐area modes considerably, making a well stable mode unstable for certain operating points. The influence of load models has been illustrated using a 68‐bus system with 30% and 52% penetration of RES.
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