Month: September 2025

Digital Controller (IGBT-based Systems)

The EX2100e Excitation control products offer a Regulator control system in a 800 mm

(32 in) enclosure with supporting hardware based on the particular application. Other

packaging options are available. The Regulator system can be purchased as part of a

finished cabinet, or individual components can be shipped separately for onsite mounting

to better serve retrofit applications.

Power conversion consists of an input section, a dc link, and the converter output section.

The input section is a 3-phase diode bridge with input filters. The system accepts a

primary ac input range of 90 to 280 Vrms, nominal for the 35 A system, and up to 480 V

rms for the 120 A system. The ac input is 480 Hz (maximum), which can be supplied as

1-phase or 3-phase from a permanent magnet generator (PMG), auxiliary bus, or

generator terminals.

The operator has full control to select

which of the dual power bridges is active or inactive. Bi-directional, bumpless transfer

between active and inactive bridges is standard. The active master can also self-diagnose

a failure or missed operation and activate the backup control and power bridge without

operator intervention.

The architecture is a single control with a single Power Control Module (PCM) or dual

control with dual PCM, including a customer interface sub-system, optional diagnostic

local operator interface (touchscreen), optional control operator interface (COI) remote

touchscreen interface, control power input module, and PCM. The PCM consists of a

bridge interface sub-system, power bridge, optional ac and dc filter networks, and

alternating current (ac) and/or dc isolation devices. For expanded input and output (I/O)

capability, either VersaMax or Mark VIe control IONet I/O modules may be added.

The EX2100e Regulator system supports Ethernet local area network (LAN)

communication to the following:

• Turbine controls and ICS, HMI, Proficy*-based Historian, Programming Interface

(PI-based) Historian, Onsite Monitoring System (OSM), and COI

• ExtendedI/O modules using the Ethernet Global Data (EGD) protocol

• CustomerDCSthrough Ethernet or Modbus Ethernet remote terminal unit (RTU)

• ToolboxST application

• GE OnsiteSupport for monitoring and diagnostics

ControlHardware

The EX2100e Regulator system is available in several configurations to provide control

flexibility for Thyristor and Regulator systems. For small Regulator systems, two

pulse-width modulated (PWM) power converter modules use Insulated Gate Bipolar

Transistors (IGBT) to provide up to 35 A or 120 A nominal output. These systems can

support the following applications:

• Saturable Current Transformers / Power Potential Transformers (SCT/PPT) regulator

• Brushless exciter regulator

• Directcurrent (dc) rotating exciter regulator

In the SCT/PPT regulator and dc rotating exciter regulator applications, the EX2100e

Regulator system can de-sensitize the effect of the exciter time constant. It incorporates

direct measurement of the generator field voltage and field current to enhance speed of

response to system transients.

The architecture is a single control with a single Power Control Module (PCM) or dual

control with dual PCM, including a customer interface sub-system, optional diagnostic

local operator interface (touchscreen), optional control operator interface (COI) remote

touchscreen interface, control power input module, and PCM. The PCM consists of a

bridge interface sub-system, power bridge, optional ac and dc filter networks, and

alternating current (ac) and/or dc isolation devices. For expanded input and output (I/O)

capability, either VersaMax or Mark VIe control IONet I/O modules may be added.

Overview

The EX2100e Excitation Control Regulator system is GE’s most recent state-of-the-art

control system for steam, gas, or hydro generators for both new and retrofit units. Control

hardware and software design is closely coordinated between GE’s system and controls

engineering to ensure delivery of a true system solution. Integration is seamless between

Excitation Control systems, Turbine Control systems, Static Starter Control systems,

Integrated Control Systems (ICS), and the Human-machine Interface (HMI). For

stand-alone retrofit applications, integration with customer distributed control systems

(DCS) through serial or Modbus ® Ethernet is supported. This document specifically

addresses applications for the 35 A and 120 A (nominal) series of EX2100e Control

Regulator systems.

The EX2100e Regulator system supports Ethernet local area network (LAN)

communication to the following:

• Turbine controls and ICS, HMI, Proficy*-based Historian, Programming Interface

(PI-based) Historian, Onsite Monitoring System (OSM), and COI

• ExtendedI/O modules using the Ethernet Global Data (EGD) protocol

• CustomerDCSthrough Ethernet or Modbus Ethernet remote terminal unit (RTU)

• ToolboxST application

• GE OnsiteSupport for monitoring and diagnostics