丝网目数对系统频率的影响很小。
发电机的频率等于系统频率。
获取原始系统频率。
多年来用调速器控制速度是唯一控制系统频率的措施。
For many years governor speed control was the only available means of controlling system frequency.
提出了一种利用富氏滤波器的输出测量电力系统频率的算法。
An algorithm which USES output of the Fourier filter to measure power system frequency is presented.
防止电力系统频率崩溃是防止系统大面积停电的一项重要措施。
Perventing frequency collapse is an important prevention measure of widespread blackout.
分析了电力系统频率偏移和谐波对传统感应电能表误差特性的影响。
The influence of frequency deviate or harmonics to the traditional kilowatt hour meter of electromagnetic induction type is analysed in the paper.
所要控制的要素包括系统频率、联络线潮流、线路电流、设备的负荷和电压。
The elements to be controlled include system frequency tie line flows line currents equipment loading and voltage.
提出了一种基于数字微分和拉格朗日插值的系统频率快速而准确的测量算法。
An algorithm for power system frequency measurement based on numerical differentiation and central Lagrange interpolation is presented.
较为全面地综述了国内外在电力系统频率概念及其测量技术方面的研究成果。
The recent achievements in the field of power system frequency measurement are summarisedin this paper.
在线预测系统扰动后的稳态频率，有利于扰动后系统频率稳定性评估和紧急控制。
On line predicting obtaining power system post disturbances steady frequency is beneficial for frequency stability assessment and emergency control.
船舶电力系统频率的稳定性主要取决于船舶电站柴油机调速系统的转速响应特性。
The frequency stability of a ship power system is determined by the speed response characteristic of the diesel engine speed regulation system in the ship power station.
这种算法具有所需数据窗的时间短、计算精度高和不受系统频率偏差影响的优点。
This algorithm needs shorter data window time and has higher calculation precision and is not affected by deviation of power frequency.
提出了一种改进的桨距角控制方案——将系统频率偏差信号引入桨距角控制系统。
An improved pitch control scheme is presented by introducing a frequency deviation signal into the control system.
电力系统频率是电能质量的重要指标之一，也是电力系统运行最重要的参数之一。
Electric power system frequency is an important indicator of power quality and is one of the most important parameters of power system operation.
电力系统运行的基本任务是维持系统频率为计划值，且保证频率偏移不超过允许值。
The basic task of power system operation is to maintain frequency to its scheduled value and guarantee frequency error is in a limited range.
如何在系统频率偏移时准确的得到基波及各次谐波的幅值和相角就成为一个重要问题。
So how to calculate amplitude and phase of the fundamental and harmonics accurately when the system frequency has an offset is an important issue.
系统频率崩溃往往是由于系统频率降低到超出发电机组承受能力，形成连锁反应所致。
Frequency collapse is often caused by the cascade reactions due to the system frequency declined beyond the withstanding capability of turbo sets.
用谐波分析法进行介损测量时，很容易受到系统频率波动的影响，从而降低测量的准确度。
The accuracy of the dielectric loss measurement based on harmonic analysis algorithm is greatly influenced by the frequency fluctuation.
本文首先对双机系统频率动态过程进行了理论分析，给出了双机系统频率动态过程的特点。
This paper aims at the analysis and computation of double machine power systems frequency dynamics and provides the characteristics of double machine power systems frequency dynamics.
讨论了系统支承角、系统频率比以及系统质量比等对易损件加速度及位移响应的影响规律。
The effects of the angle of the tilted support, the frequency ratio and mass ratio of the system on the response of acceleration and displacement were discussed.
低频减负荷（UFLS）作为电力系统的第三道防线，是一种防止系统频率崩溃的有效手段。
Underfrequency Load Shedding (UFLS), which is the third defensive line of power system, is one of effective methods to mitigate the frequency collapses.
本文对主调频水电站进行系统频率超短期预报，并把预报结果直接应用于水电站的计算机频率控制。
An ultrashort term frequency forecast of the system frequency is made for the hydropower station and the results have been applied in computer frequency control of the hydropower station.
传统电压控制模式的电机驱动电路系统频率都受电机的本征频率制约，其相位延迟会随负载的变化而变化。
The system bandwidth of conventional voltage-control-mode motor driver circuits is limited by the intrinsic frequency of the load, and its phase lag is also load-dependent.
建模的主要目标是：反映自动负荷频率控制的实际过程，以及在这一过程中影响系统频率质量的主要因素。
The main purpose of modeling is to reflect the actual process of ALFC and main factors that influence the frequency quality of power system in the process.
变电站的系统频率由电力网的有功负荷来决定，当系统频率超出允许范围时，应及时调整所带负荷以稳定系统频率。
System frequency of substation is dependant on active load of power grid. when system frequency exceeds allowable limits load shall be regulated immediately for stabilization of system frequency.
雷声公司官员说，增强型定位报告系统频率扩展型(EPLRS - XF)电台可以在信号拥堵的战场环境中实现更有效的沟通。
The Enhanced Position Location Reporting System Extended Frequency (EPLRS-XF) radio enables more efficient communication in congested battlefield environments, Raytheon officials said.
雷声公司官员说，增强型定位报告系统频率扩展型(EPLRS - XF)电台可以在信号拥堵的战场环境中实现更有效的沟通。
The Enhanced Position Location Reporting System Extended Frequency (EPLRS-XF) radio enables more efficient communication in congested battlefield environments, Raytheon officials said.
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