交流分析

according to the users′ actually demand for uninterruptible power supply for loads,the internal structure of digital generator is analysed and the reason for its uninterruptible function can′t be achieved.a design of the uninterrupted power supply system which transformed from the digital generator is proposed.the system uses the inverter of generators,ac through inverter for loads,at the same time,charges the battery as ac is normal.inverter the battery dc converters to ac for load,meanwhile,starting generator,when power failure.the system applies uninterruptible power for load,whether the ac is normal or abnormal,and design voltage and frequency stabilization,output zero-interrupted,battery charging and discharging management.without requiring purchase an uninterruptible power supply separately,this design can avoid duplication of investment and wasting of resources.

快速安全提高汽轮发电机转子检修质量。。。摘要：针对用户对负载供电不间断的实际需求，分析了数码发电机的内部结构及其不能实现供电的不间断性能的原因，提出一种由数码发电机改造组成的交流不间断供电系统的设计方法。该设计利用发电机内部的逆变器，在市电正常时，由市电经过逆变器给负载供电，同时给蓄电池充电；在市电断电时，一边启动发电机，一边由蓄电池的直流电通过逆变器转换成交流电供负载使用，实现无论市电正常还是异常，系统对负载提供不间断电源。设计对市电进行稳压、稳频、输出零切换、蓄电池的充放电管理等新功能。此设计无需单独购买不间断电源，避免重复投资和资源浪费。

In this paper, can be Phassus Siemens S7-200 controller on the three-speed winch control circuit modification, the analysis of the exchange of three-speed winch control system based on functional requirements, described the landing on Siemens PLC control system software design, given the external wiring diagram of PLC, control system provides a ladder and procedures, and simulation.

本文采用西门子可蝙程序控制器S7-200对三速起货机控制线路进行改造，在分析交流三速起货机控制系统的功能要求基础上，阐述了基于西门子PLC的起货机控制系统软件设计方案，给出了PLC的外部接线图，提供了控制系统梯形图和程序，并进行仿真验证。

With the rapidly development of the Fujian electrical network, especially the tie line power exchanging with the East China electrical network, the mode and status of power system operation become more complex.

近年来，福建电网取得了长足的发展，实现了与华东电网的交流联网，电网的运行方式和运行工况更加复杂，增加了电力系统安全稳定和故障分析的难度。

The AC drive control system of the trolley bus with two kinds of power supply in Beijing is presented.

介绍了北京双源无轨电车交流传动控制系统，分析了无轨电车交流电传动系统的特点。

With the support of embedded innovation laboratory of NWPU and with the background of the work in international cooperation project "the research of embedded real-time OS TRON" which belong to embedded key laboratory of shanxi province and TOPPERS Association in Japan, this paper analyses and researches applications on the embedded real-time operation system platform based on TRON specification.

本文在西北工业大学嵌入式创新实验室的支持下，结合陕西省嵌入式重点实验室和日本TOPPERS协会的国际交流合作项目"嵌入式实时操作系统TRON的研究"的课题研究内容，对基于TRON规范的嵌入式实时操作系统平台进行了分析与应用研究。

In this paper, the error of true rms-to-dc converter was analyzed under the condition of offset voltage of amplifier as main error, and the offset voltage expressions for affect were given.

本文以放大器的失调电压作为误差影响因素，分析放大器失调电压对交流真有效值转换器误差的影响，并给出失调电压影响的表达式。

The three stations designed to exchange the three-tier two-speed elevator control of the PLC as an example, the analysis of PLC in the elevator apply.

本设计以三层三站交流双速电梯的PLC控制为例，分析PLC在电梯控制中的应用

The three stations designed toexchange the three-tier two-speed elevator control of the PLC as anexample, the analysis of PLC in the elevator apply.

本设计以三层三站交流双速电梯的PLC控制为例，分析PLC在电梯控制中的应用

By analyzing both the technological advantages to show the development of AC variable frequency speed control system .

通过分析二者的技术优势展望了交流变频调速系统的发展方向。

In this paper, in order to improve system performance, fuzzy control technique and Voltage Space Vector Modulation technique were applied to DTC.

本文在分析交流电动机数学模型的基础上，首先介绍了直接转矩控制的原理。

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。