ABB 3ADT218437R0001 Excitation system controller

ABB 3ADT218437R0001 excitation system controller is a key device for controlling the excitation current of synchronous generators and plays an important role in the power system. Here are some introductions about it:

Function

Voltage regulation: adjust the excitation current accordingly according to the change of generator load to maintain the generator terminal voltage at a given value, ensure that the voltage of each node in the power system is stable within the allowable range, and meet the normal operation requirements of various types of electrical equipment.

Reactive power distribution control: control the reasonable distribution of reactive power between parallel generators, so that each generator can share the reactive load in the system according to a predetermined ratio, and improve the operating efficiency and stability of the power system.

Improving stability: helps to improve the static, dynamic and transient stability of parallel operation of generators. By quickly responding to disturbances in the system, adjusting the excitation current, maintaining the electromagnetic power and power angle of the generator stable, preventing the generator from losing step when disturbed, and ensuring the reliable operation of the power system.

Fault protection and demagnetization: When a fault occurs inside the generator, it can quickly demagnetize and quickly consume the magnetic field energy in the generator excitation winding to reduce the degree of fault loss and protect the generator and other equipment from damage by fault current and overvoltage. At the same time, it also has various protection functions, such as overcurrent, overvoltage, underexcitation, etc., to ensure the safe operation of the excitation system itself.

Working principle

Usually based on microprocessor or digital signal processor (DSP) technology, by collecting various operating parameters of the generator, such as terminal voltage, current, power factor, etc., and comparing and analyzing with the set reference value, and then generating a control signal according to the preset control algorithm to adjust the output of the excitation power unit, so as to achieve precise control of the generator excitation current. For example, when it is detected that the terminal voltage is lower than the set value, the controller will increase the excitation current to increase the output voltage of the generator; otherwise, it will reduce the excitation current.

Features

High-precision control: The use of advanced control algorithms and high-precision measurement technology can achieve precise adjustment of the excitation current to meet the control requirements of the generator under different operating conditions, and ensure the accuracy of voltage regulation and reactive power distribution.

Quick response capability: It can quickly detect changes in the system and respond quickly. When the power system fails or is disturbed, the excitation current can be adjusted in time to improve the stability and reliability of the system.

High reliability: It has redundant design, fault self-diagnosis and fault tolerance, adopts high-quality electronic components and strict production processes, and can operate stably for a long time in harsh industrial environments, reducing maintenance workload and downtime.

Flexible communication interface: It supports multiple communication protocols, such as Modbus, Profibus, Ethernet, etc., which is convenient for connecting with the monitoring system and automation control system of the power plant, realizing remote monitoring, parameter setting and fault diagnosis, etc., and improving the automation level and management efficiency of the power plant.