UAD149 励磁控制单元的作用是根据发电机的运行状态

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UAD149 励磁控制单元的作用是根据发电机的运行状态

励磁控制单元是励磁系统的核心部分，主要作用是控制励磁电流，UAD149实现发电机的励磁调节。励磁控制单元的种类有很多，比如ABB的KUC711AE 静态和间接励磁系统，适用于20至12000A的电流范围，它专为水力、联合循环和抽水蓄能发电厂设计。

励磁控制单元主要包括励磁调节器、励磁功率单元等部分。励磁控制单元的作用是根据发电机的运行状态，自动调节功率单元输出的励磁电流，以满足发电机运行的需要。

励磁调节器是励磁控制单元的核心部分，UAD149感受发电机的电压、电流或其他参数的变化，然后对励磁功率单元施加控制作用，进行励磁调节。具体来说，励磁调节器的工作方式包括自动方式和手动方式。在自动方式下，励磁调节器比较发电机实际端电压与自动给定值，用以控制端电压。在手动方式下，励磁调节器比较发电机实际励磁电流与手动给定值，用以控制励磁电流（当PT故障时）。

励磁功率单元的作用是向同步发电机的励磁绕组提供直流励磁电流，建立直流磁场。它通过向同步发电机的励磁绕组提供直流励磁电流，使发电机的磁场得到适当的强弱和方向，从而维持发电机正常运行所需的电压和电流。

励磁控制单元的工作原理可以根据不同的励磁方式和电源供给方式有所不同。按照励磁电源的供给方式，励磁方式可以分为直流励磁系统、交流励磁系统和静态励磁系统。按照励磁电流的供给方式，励磁方式可以分为他励和自励两种方式。

UAD149励磁控制单元的工作原理主要是根据发电机的运行状态，自动调节功率单元输出的励磁电流，以满足发电机运行的需要。通过励磁调节器和励磁功率单元的协同工作，可以实现对发电机励磁的精确控制，提高发电机的稳定性和可靠性。

励磁控制单元的参数设置需要输入密码，密码为3413416位数，长按参数键大概3秒钟，等参数设置的灯闪亮的时候就输入密码341341。在现场仅需要设置三个参数，第一个参数是功率因素的设置，出场的时候是0.85，如果现场有需要可以设置到0.99，设置到0.99就基本上是只发有功不发无功。第二个参数是电流互感器一次跟二次的电流比值，出场设定是100，可以根据现场电流互感器的大小来去设置。第三个参数是发电机额定电流与电流互感器一次电流的百分比，出场设定是百分之80。

UAD149 励磁控制单元的作用是根据发电机的运行状态

Excitation control unit is the core part of the excitation system, the main role is to control the excitation current, UAD149 to achieve the excitation regulation of the generator. There are many types of excitation control units, such as ABB’s KUC711AE static and indirect excitation system, which is suitable for the current range of 20 to 12000A and is designed for hydraulic, combined cycle and pumped storage power plants.

The excitation control unit mainly includes the excitation regulator, the excitation power unit and so on. The role of the excitation control unit is to automatically adjust the excitation current output by the power unit according to the running state of the generator to meet the needs of the generator operation.

The excitation regulator is the core part of the excitation control unit. UAD149 senses the change of voltage, current or other parameters of the generator, and then exerts control effect on the excitation power unit to perform excitation regulation. Specifically, the mode of operation of the excitation regulator includes automatic mode and manual mode. In the automatic mode, the excitation regulator compares the actual terminal voltage of the generator with the automatic set value to control the terminal voltage. In manual mode, the excitation regulator compares the actual excitation current of the generator with the manual given value to control the excitation current (when the PT fails).

The role of excitation power unit is to provide DC excitation current to the excitation winding of synchronous generator and establish DC magnetic field. It provides DC excitation current to the excitation winding of synchronous generator, so that the generator’s magnetic field can get the appropriate strength and direction, so as to maintain the voltage and current required for the normal operation of the generator.

The working principle of the excitation control unit can vary according to different excitation methods and power supply methods. According to the supply mode of excitation power, the excitation mode can be divided into DC excitation system, AC excitation system and static excitation system. According to the supply mode of excitation current, the excitation mode can be divided into two ways: separate excitation and self-excitation.

The working principle of UAD149 excitation control unit is to automatically adjust the excitation current output of the power unit according to the operating state of the generator to meet the needs of the generator operation. Through the cooperative work of excitation regulator and excitation power unit, the precise control of generator excitation can be realized, and the stability and reliability of generator can be improved.

The parameter setting of the excitation control unit needs to enter a password, the password is 3413416 digits, long press the parameter key for about 3 seconds, and enter the password 341341 when the parameter setting light flashes. Only three parameters need to be set in the field, the first parameter is the setting of the power factor, which is 0.85 at the time of appearance, if the field needs to be set to 0.99, set to 0.99 is basically only active power without reactive power. The second parameter is the ratio of primary and secondary current of the current transformer. The output setting is 100, which can be set according to the size of the field current transformer. The third parameter is the percentage of the rated current of the generator to the primary current of the current transformer, and the output setting is 80 percent.