LFO

As a result , the study of new method to damp LFO has practical significance .

因此，探究抑制电力系统低频振荡的新方法具有实际意义。

The distribution of e vector about summer LFO and its related time mean flow

夏季低频波动E矢量分布特征及其与时间平均流的关系

The observation of LFO therapy effect in advanced gastrointestinal cancer

LFO方案治疗晚期胃肠道癌近期疗效观察

Low frequency oscillation ( LFO ) becomes a serious threat to power system stability .

可以说，低频振荡已经严重威胁着现代电力系统的安全稳定运行。

It provide theoretical and simulation basis for control measures of powerformer transmission system which occurs LFO .

为能量变换器输电系统中发生低频振荡的控制措施提供了理论和仿真的依据。

It is an important project for experts in states to choose reasonable method to inhibit LFO .

如何选择合理的方式以抑制低频振荡，成为各国电力专家研究的一个重要课题。

Feature analysis of summer monsoon LFO over SCS in 1998

1998年南海夏季风低频振荡特征分析

Results show that SCS summer monsoon onset is enhanced with its LFO .

结果表明，南海夏季风的低频振荡对南海夏季风的爆发具有加强的作用；

The uniform damping control of low-frequency oscillation ( LFO ) is presented in this paper .

提出了电力系统低频振荡的均匀阻尼控制方法。

The low frequency oscillation ( LFO ) of discharge current is one of the characteristics of SPT .

放电电流的低频振荡是SPT的重要特性。

Abnormality of Summertime Precipitation of Eastern China and General Circulation with LFO in 1998

1998年夏季我国东部降水与大气环流异常及其低频特征

Analysis of the algorithm principle and the calculation speed of the examples show that the proposed LFO method is suitable for online application .

通过对本文算法的计算原理以及算例计算速度的分析，说明本文所提低频振荡模式辨识方法适合于在线应用。

Results verify the conservation of system damping and the incompatibility of LFO and SSO .

结果表明系统阻尼守恒，且低频振荡与次同步振荡不可共容；

The stronger ( weaker ) the external source , the periods of LFO the shorter ( longer );

外源强度越强（弱），大气低频振荡周期将缩短（延长）；

The chorus effect modulates the original sound by a sinusoid low frequency oscillator ( LFO ) .

和声效果通过一个正弦低频振荡器（LFO）调节原始声音。

Besides , the possible relationship between the LFO of the tropical monsoon and Meiyu occurrence is discussed .

最后分析了热带季风低频振荡与梅雨活动的可能联系。

Features of summer monsoon LFO and LFR over beijing-tianjing-hebei area in 1998

1998年京津冀夏季风的低频振荡与降水的特征

As the wide-area measurement system widely used in power system , it provides a real-time data platform for the online dentification of LFO mode .

随着广域测量系统在电力系统中广泛应用，为低频振荡模式在线辨识提供了实时的数据平台。

LFO is a serious threat to the security and stability of the grid and has become a capacity bottleneck of power exchange between transmission lines .

低频振荡严重威胁电网的安全稳定运行，成为区域间电能交换的传输瓶颈。

The frequency modulation effects of positive ( negative ) dipole and positive ( negative ) unipole forcing source on LFO have the same sensitive region .

正（负）偶极和正（负）单极强迫源对大气的低频振荡调制有相同的敏感区。

The frequency modulation effects of positive ( negative ) dipole or unipole forcing source on LFO in the mid-high latitudes are difference .

正、负偶（单）极强迫源对中高纬大气的低频振荡调制作用不同。

Under the situation of interconnection power grids expanding and the operation condition increasingly close to their maximum , the risk of low frequency oscillation ( LFO ) is greatly increased .

在电力系统规模不断扩大、电网运行越来越接近稳定极限的情况下，互联电网出现低频振荡的风险大大增加。

After that paper also explains the necessity of developing new LFO damping methods . Secondly , both vector diagram method and phase plane method are used to explain the mechanism of LFO .

并阐明了研究抑制低频振荡新措施的必要性。接着，论文从向量图和相平面法出发，分析了低频振荡产生的机理，讨论了励磁支路的负阻尼效应。

A baroclinic semi-geostrophic model , including the wave-CISK mechanism , was established to analyse the low-frequency oscillation ( LFO ) in the tropical atmosphere .

本文运用一个包含Wave&CISK机制的斜压半地转模式来讨论低纬大气中的低频振荡。

The stronger ( weaker ) the intensity of dipole or unipole forcing source and basic flow , the periods of LFO the shorter ( longer ) .

偶、单极强迫热源强度和基流强度的增强（减弱），使得大气低频振荡周期有缩短（延长）的趋势。

However , accompanying power grid inter-connection scale continuously increasing , the problem of low frequency oscillation ( LFO ) has become the most important matter to perplex the development of power grid .

但随着电网互联的规模的不断扩大，低频振荡的问题也成为困扰电力系统的几个重要问题之一。

And the changes in both sensible and latent heat could modify the diabatic heating rate in the middle and low troposphere which lead to the variations of the LFO period .

整个个过程使得对流层中下层的非绝热加热过程发生变化，从而导致热带大气低频振荡周期发生改变。

Correlation analysis between the wind and heating in the low frequency domain shows that the atmospheric heating is important to the formation of LFO , the key factor is the latent heat release of moisture .

而流场与大气加热场之间在低频域内的相关分析则证实了大气加热对低频振荡的产生起重要的作用，其中最重要的因子是水汽潜热的释放。

In the meantime , the changes in the intensity of dipole or unipole forcing source and basic flow have different frequency modulation effects on LFO in the mid-high latitudes .

同时偶、单极强迫源及基本气流的强度变化对中高纬大气的低频振荡调制作用不同。

On the other hand , the tie-line power oscillation curves show that interventional excitation control method can damp LFO better than the ordinary one , which helps to improve the dynamic stability of power system .

通过不同运行方式下联络线功率振荡曲线比较，证明了可介入式励磁控制方式能够更好的阻尼低频振荡，提高电力系统动态稳定性。