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1 ?棒球生死斗 棒球生死斗(Power Swing) 棒球生死斗 2 ?电力系统振荡 电力系统振荡中不对称故障的故障选相新方法--中国电力科技网 关键词： 电力系统振荡，故障选相，高频分量 [gap=2532]Keywords: power swing, fault phase selecting, high frequency exponent 3 ?如功率摇摆 ...是电路分析的基本工具，即使电力系统 根据不同应用对广域保护系统的不同要求以 处于某些非稳定状态， 如功率摇摆（power swing）及各个阶段所掌握的不同技术，其系统结构也有 状态，由于电压和电流值的变化比较缓慢，因此所不同。 4 ?功率波动 功率波动 power fluctuation; power surge; power swing 频率波动 frequency fluctuation; frequency flutter; frequency jitter ..
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Based on the relative variation of impedance during power swing, a novel phase selector for high voltage transmission lines is proposed. 提出了一种基于阻抗相对变化的高压线路保护选相新原理，用作振荡期间的选相元件。 - 2
Measures, such as the floating of threshold, braking by positive sequence current, driving up the threshold during power swing, etc are suggested to prevent th. 采用浮动门槛、正序电流制动和静稳破坏后提高动作门槛值的方法，来防止系统振荡时误启动。 - 3
Establish the fuzzy set based on modulus component, three phases and residual current, which can distinguishing unbalance faults from power swing rapidly and reliably. 建立了基于模分量大小和三相及零序电流大小的模糊数学模型，能快速准确的识别振荡中发生的不对称故障。
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