磁发电机

The self-excitation criterion of single-machine is difficult to apply to multi-machine power system, so the mathematical model to judge the self-excitation of all generating sets in multi-machine power system is researched.

1引言随着同步发电机组单机容量的增大和远距离负荷中心电站的建设，以及电力系统容量、电压和输电距离的不断发展和提高，许多问题随之产生，同步发电机的自励磁问题就是其中之一。

The annulus model captures the key features of rotating convection in full spherical geometry and has been widely employed to study convection, magnetoconvection and dynamos in planetary systems, usually in connection with the small-gap approximation neglecting the effect of azimuthal curvature of the annulus.

圆环模型被广泛用来研究行星系统的对流，磁对流和发电机。通常在这些研究中用到了小间隙的近似，忽略了圆环的环向曲率效应。我们这一工作用数值模拟方法解完全的非线性对流方程组来研究有限间隙的旋转圆环中的非线性对流。

This design detailedly to introduce does not there is not to scrub that the synchronical dynamo design transpories acting as the process.now the revolving silica ballast that I adopt is more prevalent does not there is not the scrubing excitation system.through main dimensions of the dynamo design to fix the electromagnetic theory , reachs again the wear and tear to the electrical machinery 、Electric current 、Tension 、Temperature rise 、Effectiveness college stone .

本设计详细地介绍了无刷同步发电机的设计运作过程，我采用的是现在较流行的旋转硅整流器无刷励磁系统。

The excitation system parameters of large synchronuous generators have great effects on modern power system stability studies.

摘要大型同步发电机励磁系统参数对现代电力系统稳定研究有重要的作用。

The application of multi-interrupt brings much convenience to design program and makes the processing time of program meet the requirement of the fast excitation control system of generators responding to signal.

多个中断的嵌套调用，为程序的设计带来了极大方便，使各种服务程序的执行时间满足快速发电机励磁控制系统对信号响应时间的要求。

Aiming at safe and reliable operation of power generating sets,design concepts of exciting system s of generators,as well as four main ways of their control,are respectively being analyzed and discussed.

为使发电机组安全可靠运行，探讨了发电机励磁系统的设计理念。

Although the measures such as the simulation method with detailed generator model in which the dynamic behavior of exciting system is taken into account and installing power system stabilizers in main generators of Northeast Power Grid were adopted, it was still unable to effectively verify the reasonableness of parameter setting of PSS as well as its integrated matching result, and there was not enough scientific foundation for the selection of power grid model, especially load models. Moreover, it was hard to make accurate quantitative analysis, even though the qualitative analysis, on the close extent of selected models to actual operation of power grid.

虽然采取了计及励磁系统动态行为的详细发电机模型的仿真方法、在东北电网重要发电机组上加装电力系统稳定器(power system stabilizer，PSS)等措施，但PSS参数整定的合理性及整体匹配效果无法得到有效验证，选择电力系统模型尤其是负荷模型还缺乏足够科学依据，对所选模型与电网运行实际的贴近程度也很难做出准确的定量甚至定性的分析。

The prestress method is tried to be used to solve the problem of magnetic tensile force and lateral vibration on a turbo_generator rotor and the calculating formula is presented.

探讨了采用预应力法求解发电机转子磁拉力与弯曲振动问题的可行性，导出了有关的计算公式。

By the reserching the relation between stellar chromospheric activity and color index, we find that stellar ages play a pivotal role for producing Vaughan-Preston gap of MS stars.

从主序星的角动量与以色球活动指数为指标的磁动量间的相关性分析表明α~2Ω发电机可能是M型主序星磁场产生的主要机制。

With its enlargement of scale, and increasingly complex structure and running mode, the power system requires that the excitation system has better operation performance, higher reliability, better economical efficiency and flexibleness.

随着电力系统规模的不断增大，系统结构和运行方式日趋复杂，对同步发电机励磁调节器运行的可靠性、稳定性、经济性和灵活性都提出了更高的要求。

This one mode pays close attention to network credence foundation of the businessman very much.

这一模式非常关注商人的网络信用基础。

Cell morphology of bacterial ghost of Pasteurella multocida was observed by scanning electron microscopy and inactivation ratio was estimated by CFU analysi.

扫描电镜观察多杀性巴氏杆菌细菌幽灵和菌落形成单位评价遗传灭活率。