本文提出了用“频谱分析”的方法分析外部扰动引起的电力系统随机振荡，并建立了完整的数学模型。
This paper puts forward a "Spectrum Analysis" method to analyse the random power oscillation in power system caused by external disturbance, and sets up a complete digital model.
断线事故会引起整个输电系统的振荡，甚至导致输电塔倒塌及产生火灾等次生灾害。
The vibration caused by the broken wire may make the transmission line system vibrate and the tower collapse, and even lead to fire accidents.
电力系统强迫功率振荡为持续的周期性小扰动所引起低频振荡现象。
Power System forced power oscillation is a kind of low frequency oscillation caused by persistent periodic small disturbance.
在音响设备中出现的振荡频率极低的低频振荡，常因放大系统的正反馈回路引起。
In audio, a very low frequency oscillation often resulting from a positive feedback path in an amplifier system.
由于电力系统的日趋复杂和庞大，电力系统除了因负阻尼引起的低频振荡外，还存在PSS不能消除的混沌振荡的危机。
Because of power systems being more and more complicated, besides low frequency oscillation by minus damp, there is also chaos oscillation that can not be dispelled by PSS in power systems.
负阻抗会引起地铁车辆牵引变流器直流侧电压、电流振荡，降低牵引传动系统稳定性。
Negative impedances lead to DC-link voltage and current oscillation in metro traction converters and so to reduction of stability of traction drive systems.
负阻抗会引起地铁车辆牵引变流器直流侧电压、电流振荡，降低牵引传动系统稳定性。
Negative impedances lead to DC-link voltage and current oscillation in metro traction converters and so to reduction of stability of traction drive systems.
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