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AC Power Supply System Communication Power Supply System exchanges generally are high-voltage power distribution, step-down transformer, Chai oil-fired units, UPS and low-voltage distribution screen composition.

通信电源的交流供电系统一般由高压配电所、降压变压器、柴油发电机组、UPS和低压配电屏组成。

In this condition, the parallel transformer can exhibit nearly zero impedance to harmonic current and very high primary self-impedance to fundamental current and thus lead harmonic current in power systems to flow into the transformer branch. With a step-down transformer, the power semiconductor switches of the active power filter are always worked in relatively low voltage, which ensure the security and reliability of the active filtering device.

实时检测并联变压器一次侧的谐波电流，根据谐波补偿条件，得到谐波补偿电流的指令信号，通过电力电子变流器跟踪产生谐波补偿电流注入到二次侧补偿绕组中，使得并联变压器对谐波电流呈现近似为零的低阻抗，对基波电流呈现很大的一次侧自阻抗，从而输导系统中的谐波电流流入并联变压器支路。

With the fast development of power system and the stepwise realization of power market, the problem of large-scale power grids stability becomes more complicated.

随着电力系统的飞速发展和电力市场的逐步实现，大电网的稳定问题变得更加复杂。

Study testifies that the gender pattern of Chinese households today on the whole displays an inequality trend with strong males and weak females, but there are large gender differences in different dimensions and power spaces, while the husband-and-wife power has become a dominant family control power.

研究证实，今天中国家庭权力的性别格局就总体而言，仍呈男强女弱的不平等态势，但在不同维度和权力空间存在着较大的性别差异，而夫妻权力已成为家庭主导性的控制权力。

The design and construction of sub-station of the power bureau is an integral part of this system engineering project; it consists of three components, data query, exception management and system management, mainly for the benefits of power dispatching and maintenance personnel of the Liaoning Power Grid.

电业局子站的设计与实现是该系统工程项目中的重要组成部分，主要面向辽宁省电网电力调度的管理与维护人员，包括数据查询、异常管理、系统管理三个组成部分。

By introducing the concepts of semiideal and regular semiideal with respect to a given subring, the general power rings and regular power rings are constructed and a number of examples of non-regular HX rings and non-regular power rings are cited.

通过引入了关于一个子环的半理想与正则半理想概念，构造出一般幂环与正则幂环，并具体给出了若干非正则HX环与非正则幂环的例子。

The second part elaborated the process and conditions that authoritarianism established in Indonesia first, namely the course of Suharto snatching power and Sukarno losing power, and the reasons of that conversion. The establishment of Suharto's power symbolized the beginning of authoritarianism in Indonesia.

第二部分首先阐述了印尼威权政治的确立过程及条件，即苏加诺失权与苏哈托得权及权力转换的原因，苏哈托统治印尼即标志着印尼威权政治时代的开始。

Its real power and reactive power consumption is the vector sum of active power, active energy meters record consumption of electricity less than the actual value.

其实际消耗是无功电能和有功电能的矢量之和，有功电表记录的数值小于实际消耗的电能。

With the fast developing of electric power industry and rapid increasing of power system load ,the demands of power suppleness reliability have become more stricter.

随着电力行业的飞速发展，系统负荷的迅速增长，对电网可靠性的要求也变得更加严格。

It is the basis of the power supply corporation's survivance and development to guarantee the power network's security, steady, economy, and to provide consumer with electric power with the high grade.

确保电网安全、稳定、经济运行，确保向用户提供优质电能，是供电企业生存和发展的基础，这一切都有赖于其生产管理系统。

The work of this paper is as follows: 1. Looking back the progressing history of the linear motor, introducing the features of the elevator driven by linear induction motor, radicating the topic of this paper "the digital frequency variable control of the elevator bi-side direct driven by linear induction motor". The research of this paper covers the conventional VVVF control, space vector based VVVF control, vector control and DTC.

本文主要开展了以下几个方面的工作： 1 回顾了直线电机发展历史，电机的驱动技术演变，特别是针对直线电机的驱动，简要介绍了直线感应电机驱动电梯的优点和不同结构类型，对传统的v／f控制，基于空间矢量法的v／f控制，矢量控制，和基于电压空间矢量的直接转矩控制进行了比较，确立了本课题的研究主题：直线感应电机双边直推式驱动电梯的全数字变频控制。

The article combines with the treatment of a superficial civil air defense work to introduce how the grouting method to improve the performance of the backfill soil.

文章从治理漂浮人防工事的角度提出了注浆技术在改善回填土性质方面的应用，并详细阐述了注浆技术的施工流程。