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多频失步振荡场景下大区互联电网失步振荡中心电压频率演变规律研究

DOI: 10.13334/j.0258-8013.pcsee.2015.13.008, PP. 3257-3263

Keywords: 失步解列,多频失步振荡,电压频率,失步中心

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Abstract:

交直流互联电网背景下,复杂的运行方式和多变的故障形式导致系统失稳模式不再局限于两群失稳。现有基于等值两机模型的失步振荡中心定位方法受到严重挑战,多频失步场景下失步振荡中心的电气量特性亟待研究。该文基于理论分析,针对等值3机系统失步振荡中心频率特性进行了较为深入的研究,提出了相应的失步振荡中心定位方法。首先,构建并求解3机等效系统的失步模型,并推导系统内任一点处电压幅值、频率等电气量的解析表达式;然后,基于所得解析表达式详细分析多频场景下失步振荡中心电气特性:位于失步中心异侧的站点电压频率播送方向相反,且电压频率曲线间无交点;位于失步中心同侧的站点电压频率播送方向一致,且电压频率曲线间存在交点;最后,WSCC系统与某实际区域电网仿真验证了所得结论的正确性。

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