In domestic AC interconnected area power grids the low-frequency oscillations still exist due to insufficient damping.
在我国大区交流互联系统中存在着区域间弱阻尼或负阻尼低频振荡问题。
For some operating conditions, a synchronous generator with a rectifier and back-EMF load maybe exhibit low-frequency oscillations when the system parameters do not match.
同步发电机整流带反电动势负载时，当系统参数不匹配，在一定工况下，可能出现低频振荡。
Dynamics analyses and model atmosphere calculations further demonstrate that EWFMand CISK are very important physical processes in leading to the low-frequency oscillations in the tropics.
动力学分析和模式大气的计算结果进一步说明了CISK和EWFM的共同作用是激发和驱动热带大气低频振荡的重要物理过程。
If the frequency of oil-pressure pulsation is near to power system natural oscillations frequency, power system low frequency oscillations of resonance mechanism can be induced.
全液压调速系统的油压容易产生脉动，如果油压脉动的频率与电力系统固有频率接近时也可能引发电力系统共振机理的低频振荡。
According to two units with hydraulic coupling in hydropower plants, the effect of expanded unit connection to low frequency oscillations damping was studied in detail.
研究机组之间存在水力联系的水电站中，两台机组采用扩大单元接线对系统低频振荡阻尼的影响。
Currently, Power System Stabilizers (PSS) and FACTS damping controllers are widely used to suppress the low frequency oscillations and to improve small signal stability.
目前，电力系统主要采用电力系统稳定器(PSS)和FACTS阻尼控制器来抑制低频振荡，提高系统小扰动稳定性。
Large amplitudes of cables can be induced by low order frequency harmonic oscillations. Then, some destructive accidents will happen, and some efficient control methods will be needed.
缆索结构系统在外部激励作用下将产生低频谐振，会导致大的振幅而可能有破坏性事故发生，故需要一种有效的方法控制这种振动。
The conclusion can provide reference to research into the causes of power system low frequency oscillations.
该研究结果对探讨电力系统低频振荡的原因具有一定的参考价值。
Results reveal that there are significant low frequency oscillations with 30-60 day period over the SCS region.
结果表明，夏半年南海地区存在显著的30 ~60天的周期振荡。
Results reveal that there are significant low frequency oscillations with 30-60 day period over the SCS region.
结果表明，夏半年南海地区存在显著的30 ~60天的周期振荡。
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