Generator Excitation System for Hydroelectric Power Plant
发电机励磁系统的水电站
励磁系统介绍
励磁系统是电力系统及其附属设备提供给励磁电流的同步发电机。 励磁系统，包括励磁电源和励磁装置。激发功率的主体是励磁机或励磁变压器。
该励磁装置是控制和调节励磁电流除激励功率在同步发电机的励磁系统的电气控制装置。 根据不同的规格，型号和使用要求，它是由单独调节面板，控制面板，灭磁屏和整流器。
励磁系统是发电机的重要组成部分，是一个必须具备的设备发电站。 它还具有对电力系统的安全稳定运行和发电机本身显著影响和作用。
励磁系统的主要功能
11.根据发电机负载变化来调整相应的激励电流保持电压为机器侧的一个给定值。
发电机的并联运行之间2.控制无功功率分配。
3.提高发电机并联运行的静态稳定性。
4.提高发电机并联运行的暂态稳定性。
5.灭磁，以减少损失故障时，内部发电机故障。
6.根据运行要求来限制最大激发和发电机的最小激发。
激发的分类
按直流发电机的励磁方式，它可以被分成单独的激励，并励，级联激励，和化合物激发等
根据整流方式：
1.旋转式励磁
旋转式励磁包括直流和交流和无刷励磁。
2.静态型激励
静态类型的激励包括潜在来源静态励磁和复合电力静态励磁。
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Introduction of excitation system
The excitation system is the power system and its ancillary equipment supplied to excitation current for synchronous generator. Excitation Systems includes excitation power and excitation device.The main body of excitation power is exciter or excitation transformer.
The excitation device is an electrical control device that controls and adjusts excitation current besides excitation power in excitation systems of synchronous generator. According to different specification, type and operating requirement, it consists of regulating panel, control panel, de-excitation screen and rectifier separately.
Excitation system is the important part of generator and is a must-have equipment for power stations. It also has significant influence and effect on the safe and stable operation of the power system and the generator itself.
The main function of the excitation system
1. Maintain voltage for a given value of machine side according to the generator load changes to adjust the excitation current corresponding.
2. Control reactive power allocation between parallel operation of the generator.
3. Improve static stability of the generator parallel operation.
4. Improve transient stability of the generator parallel operation.
5. Deexcitation to reduce loss fault when internal generator failure.
6. According to operational requirements to limit the maximum excitation and the minimum excitation of generator.
Classification of the excitation
As per the excitation mode of DC generator, it can be divided into separate excitation, shunt excitation, cascade excitation, and compound excitation, etc.
According to the way of rectifying:
1. Rotating type excitation
Rotating type excitation includes DC & AC and brushless excitation.
2. Static type excitation
Static type excitation consists of potential source static exciter and composite power static exciter.
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