直流的

When signals under test are 单击此处编辑母版标题样式 weak, in order to realize signals transmission especially for long distance, direct current amplification or modulation and demodulation may be adopted.

传感器输出的电信号一般为较低频率分量(在直流至几十千赫兹之间)，当被测信号比较弱时，为了实现信号的传输尤其是远距离传输，的电信号一般为较低频率分量(在直流至几十千赫兹之间)，当被测信号比较弱时，为了实现信号的传输尤其是远距离传输，可，当被测信号比较弱时以采用直流放大或调制与解调。

Its thought is to change the model of the asynchronous motor through the coordinate, make it become direct current motor model, divided the electric current vector of the stator into according to the weight of two pieces of direct current with directional magnetic field of the rotor and controls, realize magnetism coherent and torque solve lotus root control , in the hope of the control result of the direct current reaching machine.

其思想就是将异步电动机的模型通过坐标变化，使之成直流电动机模型，将定子电流矢量分解为按转子磁场定向的两个直流分量并分别加以控制，从而实现磁通和转矩的解藕控制，以期达到直流电机的控制效果。

On the basis of analyzing and researching the reason of the current leakage with the underground D.

本文分析研究了煤矿井下直流架空线电网产生漏电的原因，总结了漏电保护研究的现状，并在此基础上阐述了基于附加直流电源的煤矿井下直流架空线电网漏电保护的原理。

In chapter 5, considering an AC/DC system that includes two DC lines. Based on feedback linearization in the nonlinear systems and linear quadratic optimization control theory in the linear system, two new nonlinear additional controllers are designed in the same time.

第五章针对包含两条直流传输线路的交直流互联系统，采用状态反馈精确线性化方法与线性系统的二次最优控制相结合的方法，同时设计了两条直流线路的非线性附加控制器。

During monopolar operation of HVDC systems with ground return, there is a large scale DC route between soil and AC power net and currents returned from earth may enter into neutrals of transformers, which cause DC bias of transformers and influence transformers running.

直流输电系统单极大地运行时，土壤和交流电力系统构成一个大范围的直流通路网络，从大地返回的电流流过变压器中性点将使变压器出现直流偏磁，影响变压器的正常运行。

The impacts of the ultra high voltage AC/DC grid on Fujian power grid are analyzed in this paper. The security and stability of Fujian power grid and the interactions among the AC and DC system are studied under the single/double faults of EHV AC transmission lines and monopolar/bipolar block faults of EHVDC system near converter station.

中文摘要：分析了交、直流特高压电网对福建电网安全稳定的影响，研究了特高压交流电网、特高压直流系统发生故障时福建电网的安全稳定性以及受端换流站附近交流电网单一或严重故障对直流系统的影响及系统安全稳定水平。

With building and operating of several high voltage DC electric transmission lines in China, it is very important for providing domestic high voltage DC metal oxide arresters applied in HVDC system.

随着中国多条高压直流输电线路的建成和运营，直流输电系统用高压直流金属氧化物避雷器的国产化具有重要的意义。

This paper analyzed the state of arts of the research on voltage stability for AC/DC system in detail, expecially for MIDC system.. According to the problems of voltage stability in MIDC system, the authors pointed out the issues that should be furth

本文对交直流输电系统电压稳定分析的研究现状进行了归纳和分类，介绍了用于交直流输电系统电压稳定分析的方法，特别针对多馈入交直流系统电压稳定问题，探讨了今后的研究方向。

This paper takes the FuXing substation De_ icer demonstrate project as an example to analyze the structure and characteristic of Dc_ icing system, and have given a perfect protection configuration scheme and operation strategy, which have laid the first stone for the application and development of De_icer control and protection system.

本文以复兴变电站直流融冰示范工程为例，对直流融冰系统的结构、特点进行了分析，并给出了完善的保护配置方案和操作策略，为直流融冰控制保护系统的应用与开发打下了基础。

An injection type shunt hybrid active power filter was analyzed, it can suppress harmonic currents and compensate high capacity reactive power, nevertheless, a sharp boosting on DC-side voltage was found in application. Based on the analyses of the reasons, different solutions was proposed such as adoption of main circuit of multiple performances, the use of hysteretic control method, fore-feed control of reflowing current or direct control on DC-side voltage without a rectifier to supply.

研究一种兼具大容量无功补偿能力的注入式并联混合有源滤波器，并分析其在工程应用中发现的直流侧电压抬升现象及这种现象产生的原因，在此基础上提出从采用多重化主电路结构、滞环控制法、回灌电流前馈控制法和脱离整流电源直接对直流侧电压进行控制等几个方面来抑制直流侧电压抬升的方法。

On the other hand, the more important thing is because the urban housing is a kind of heterogeneity products.

另一方面，更重要的是由于城市住房是一种异质性产品。

Climate histogram is the fall that collects place measure calm value, cent serves as cross axle for a few equal interval, the area that the frequency that the value appears according to place is accumulated and becomes will be determined inside each interval, discharge the graph that rise with post, also be called histogram.

气候直方图是将所收集的降水量测定值，分为几个相等的区间作为横轴，并将各区间内所测定值依所出现的次数累积而成的面积，用柱子排起来的图形，也叫做柱状图。