power network frequency

Primary Frequency Control Strategy of Hydro Power Unit for Yunnan Power Network

云南电网水电机组参与一次调频改进方案

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Aiming at the impact of electric network fluctuation on frequency diverter, it provides countermeasures in aspects of expanding electric network capacity, technical reformation, electric network filtering, applying on-line tap changer and uninterruptable power supply, and modifying frequency inverter parameter setup.

针对电网波动对变频器运行造成的影响，从电网扩容与技术改造、电网滤波、采用有载调压变压器和不间断电源、修改变频器参数设置等方面提出了相应的措施。

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According to the specification of GSM repeater power amplifier, radio frequency link design and network topology map of power amplifier are confirmed.

针对直放站功率放大器的设计指标要求，确定了功率放大器的射频链路设计方案和功率放大器的整体网络拓扑结构图。

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Analysis of High Frequency Power Dividing Network in CATV System

CATV系统高频功率分配网络分析

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Therefore, Frequency hopping communication is very suit for peer to peer networks without power control, such as frequency hopping communication for military 、 urgency Ad-hoc network for edge region.

所以，跳频通信非常适合无中心控制的网络，如军事跳频通信网络、边缘地区紧急Ad-hoc网络等。

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Application study of automatic-generation-control unit in primary frequency regulation of power network

自动发电控制机组在电网一次调频中的应用研究

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On the problem of alarm when parts are falling down in the nuclear power station, the Artificial Neural Network ( ANN) method has been firts applied in realizing the alarm of falling parts based on the time frequency characteristics of impact signal.

针对核电站一回路系统中检测金属跌落零件误报警率高的问题，提出了基于信号时频域二维特征的神经网络报警方法。

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Contrasted with traditional cycloconverter without logical circumfluence, the new cycloconverter fed drive system not only eliminates reactive power impluse to electric network, but also heightens upper frequency of maximum output current and reduces output ripple current.

与传统的逻辑无环流交交变频器相对比，不但消除了变频器对电网无功的冲击，而且提高了最大输出电流的频率上限，减小了输出脉动。

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Low voltage power line is a time-varying system of complex network structure, whose hostile channel properties such as very low impedance, instability channel frequency, strong noise pollution, attenuation and time-variance must be considered.

低压电力线是网络结构复杂的时变系统，其信道表现出阻抗变化大、信道频率特性不稳定、信号所受干扰强和时变性大等特点。

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With the development of the inter-area power system, the low frequency oscillation becomes one of the most primary factors to endanger the safe operation and restrict the through-put capacity of the electrical network.

随着互联电力系统规模的日益增大，系统互联引发的低频振荡问题成为危及电网安全运行、制约电网传输能力的最主要因素之一。

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