励磁的

Based on varying process of generator terminal parameters after excitation fault, shortages of excitation protective principle of static stability boundary and asynchronous impedance boundary are analyzed. It proposed that excitation fault research relates to large-disturbance stability. Because dynamic power-angle character of generator after excitation fault is non-sinusoidal, there are differences between dynamic power-angle character and static state power-angle character. So it isn't ideal to protective operation result based on small-disturbance stability and static stability boundary criterion. At the same time, it proposed that asynchronous boundary impedance criterion is a constant reactive power circle moving adown j Xd′. It can ensure complete loss-of-excitation generator measuring impedance enter into the circle, but can't ensure the other condition measuring impedance including impossible losing synchronism enter. So loss-of-excitation protection would be maloperation when system voltage drops short and recovers or generator rejects load.③Based on stability principle, it puts forward setting conditions and calculation method of generator loss-of-excitation protection by direct measuring power-angle.

以励磁故障后发电机端的相关参数的变化为基础，通过对以静稳定边界和异步阻抗边界作判据的两类三种现行励磁保护在原理上存在的缺陷分析，发现：励磁故障是一个大干扰稳定性问题，励磁故障后的发电机的动态功角特性与静态功角特性有很大的差异，已远非正弦曲线，因此基于小干扰稳定性原理、以静稳定边界作判据的保护必然动作不理想；异步边界阻抗判据是一个下移j Xd′的等无功阻抗圆，它可以保证完全失磁后的发电机测量阻抗能进入该阻抗圆，但不能保证完全失磁之外的其它状态不会进入该阻抗圆，因此在系统电压短时下降或发电机突然甩负荷等情况下可能启动该保护使之误动。

The paper makes an improvement on the circuit model of transformer in calculation of electromagnetic transients. Two conditions are investigated: exclusion of transformer magnetizing branch and inclusion of hysteresis curve of transformer magnetizing branch.

本文在电磁暂态计算中完善了变压器的电路模型，分析了在不考虑变压器励磁支路和考虑励磁支路的情况下线路合闸过电压水平计算值的差异，研究了合空变励磁涌流，最后对得出的计算结果进行了分析。

In order to improve the reliability of the nuclear Generating Sets and the stabilization of the power system, prevent the long time low frequency oscillation caused by the disturbed of the outside electrical net, assured improving the stabilization margin of the nuclear generating sets in the precondition of enough transient stability, validate the sensitivity of the parameter to the damping of Generating Sets of the MEC5220 digital excitation adjustor produce in Japan that used in the Second Project of Qinshan Nuclear Power Plant, confirm the parameter rationality of the digital excitation adjustor, optimize the parameter of PSS, in this paper, we put up a in-depth study to the principle of MEC5220 digital adjustor produce in Japan by the PSS/E software that develop by the PTI Company in the USA, completed the modeling of the excitation adjustor, PSS, generator, excitor, described the performance of this excitation adjustor, analyzed the essential reason that caused the low frequency oscillation, illuminated the factor that influence the damping characteristic of the MEC5220 digital excitation adjustor. Based on model and emulate, this paper optimized the primary parameter of the excitation adjustor, make a reasonable regulation to the PSS parameter.

为提高核电机组的运行可靠性和接入系统的安全稳定性，防止在外电网的干扰下核电机组发生长时间的低频振荡，保证机组在暂态稳定的前提下提高其稳定裕度，验证秦山核电二期核电机组所配日产MEC5220型数字式励磁调节器参数对机组阻尼的灵敏性，确定数字式励磁调节器的参数的合理性，优化PSS整定参数，本文利用美国PTI公司研发的PSS／E软件对日产MEC5220型数字调节器的原理进行进行了深入细化的研究，完成了励磁调节器、PSS、发电机、励磁机的建模，描述了该型励磁调节器的性能，分析了产生低频振荡的根本原因，阐明了影响阻尼特性的因素。

Microprocessor-based excitor has rapid regulatingspeed, high precision, more reliability and other excellences.What Double-channel microprocessor-based excitation regulators mean that onesynchronous generator has two microprocessor-based regulators, one as the main, theother as the backup.

双通道励磁调节器是指在每个发电机配置两个微机励磁调节器，一个为主机，一个为备机，两个通道之间实现冗余备份，可以极大提高励磁系统的可靠性。

This generator adopts such two excitation systems as harmonic excitation self-excitation constant and automation volt controlling excitation constant volt,it owns many advantages as the best dynamic properties、simply operating and durable.

发电机采用谐波励磁自励恒压和自动电压控制励磁恒压两种励磁系统，具有最佳的动态特性，使用方便可靠，经久耐用。

The shunt winding has a large number of turns and takes only s small current (less than 5% of the rated armature current).

除此之外，励磁可以使用两种不同的励磁绕组：并励和串励。

After the characteristics and development of excitation system of synchronous generators are analyzed, micro-computer regulating theory of excitation system is discussed, this dissertation presents a scheme of designing excitation system with Programmable Computer Controller and IGBT, and PCC IGBT excitation system of turbine generator is also developed according to the above mentioned.

本文在全面分析同步发电机微机励磁装置特点及发展现状的基础上，论述了微机励磁调节的原理，提出基于可编程计算机控制器控制的绝缘栅双极晶体管励磁系统的设计方法，并在此基础上开发了基于PCC控制的水轮发电机IGBT励磁系统。

Field loss protection of generator has to operate after field regulator low excitation limit, to prevent maloperation of field loss protection the setting match between field loss and low excitation limit should conform with this requirement that related protocol states.

发电机的失磁保护必须在励磁调节器的低励限制之后动作，为防止失磁保护误动作，相关规程均明确要求失磁保护和低励限制的整定必须满足此配合条件。

By introducing the applications of static self and shunt excitation system in large and medium sized steam turbo-generators at home and abroad in recent years,the great advantages of such excitation method are demonstrated.

摘 要：通过介绍发电机自并励静止励磁系统近年来在国内外大中型汽轮发电机中的应用，说明该励磁方式与过去的励磁方式相比有较大的优越性。

By introducing the applications of static self and shunt excitation system in large and medium sized steam turbo-generators at home and abroad in recent years,the great advantages of such excitation method are demonstrated.

杨旭，刘立瑞，莫钰英摘要：通过介绍发电机自并励静止励磁系统近年来在国内外大中型汽轮发电机中的应用，说明该励磁方式与过去的励磁方式相比有较大的优越性。

He knows that he's one of the mostdominant players in the NBA right now.

我知道他现在是联盟里最有统治力的球员之一了。

Using analysis method of BCG , the dissertation analyzed the management of voluntary service organizations .

利用BCG分析方法对我国的志愿服务组织管理进行了分析。