ALSTOM DX21 是阿尔斯通公司（Alstom）生产的一款数字励磁控制器，由 Converteam 制造，现在归属于阿尔斯通公司。这种控制器是发电机控制系统的一部分，能够自动调节发电机的磁场电流，以维持发电机端电压在所需的水平 。

ALSTOM DX21-M3 数字励磁控制器的主要特点和功能包括：

使用先进的数字控制技术，确保精确的励磁电流调节和稳定的输出电压。

支持多种励磁控制模式，例如手动调节、PID控制等，以适应不同的运行要求和环境条件。

提供实时监测和反馈，能够快速响应负载变化。

通过通信接口（如Modbus或其他标准接口）与监控系统集成，实现远程监控和控制。

具备故障诊断功能，能够检测并报告励磁系统的异常状态或设备故障。

设计紧凑，易于安装在发电机控制柜中，并通过LCD显示屏或键盘进行操作和设置。

通过严格的工业标准测试，确保在恶劣环境和高负载条件下的可靠性和稳定性 。

应用领域广泛，包括：

电厂：用于大型发电机组的励磁系统控制，确保发电机在各种负载和电网条件下稳定运行。

工业自动化：适用于工业领域的发电机控制和励磁调节，如水泵站、工厂自备电源等。

电力系统：在电网故障时，确保备用电源和应急发电设备的快速响应和稳定输出。

交通运输：在铁路和船舶等运输领域，作为电力系统的备用电源和主发电机的励磁控制。

市政工程：应用于市政基础设施的发电控制和励磁调节，如市政电网和建筑物的应急电源系统 。

此外，还有提及到型号DX21-M2，表明该系列可能包含不同版本或型号的产品，例如在  中提到的DX21-M2型号。

The ALSTOM DX21 is a digital excitation controller from Alstom, manufactured by Converteam and now owned by Alstom. This controller is part of the generator control system and automatically regulates the generator's magnetic field current to maintain the generator terminal voltage at the desired level.

The main features and functions of the ALSTOM DX21-M3 digital excitation controller include:

Advanced digital control technology ensures accurate excitation current regulation and stable output voltage.

Support a variety of excitation control modes, such as manual adjustment, PID control, etc., to adapt to different operating requirements and environmental conditions.

Provides real-time monitoring and feedback to quickly respond to load changes.

Integrated with the monitoring system through communication interfaces (such as Modbus or other standard interfaces) to achieve remote monitoring and control.

With fault diagnosis function, can detect and report the abnormal state of the excitation system or equipment failure.

The compact design makes it easy to install in the generator control cabinet and operate and set up via an LCD display or keyboard.

Rigorous industry standard testing ensures reliability and stability in harsh environments and high load conditions.

A wide range of applications include:

Power plant: Used for excitation system control of large generator sets to ensure stable operation of generators under various load and grid conditions.

Industrial automation: suitable for generator control and excitation regulation in industrial fields, such as water pumping stations, factory owned power supplies, etc.

Power system: In case of power grid failure, ensure the fast response and stable output of standby power supply and emergency power generation equipment.

Transportation: In the field of transportation such as railways and ships, as a backup power supply for power systems and excitation control for main generators.

Municipal engineering: Applied to the generation control and excitation regulation of municipal infrastructure, such as municipal power grids and emergency power systems for buildings.

In addition, there is a reference to the model DX21-M2, indicating that the series may contain different versions or models of the product, such as the DX21-M2 model mentioned in the article.