GE EX2100e Datenbogen

GE Energy 
 

EX2100e Excitation Control 
for Gas Turbine Generators 
  

The EX2100e excitation control is GE Energy’s advanced 
platform for generator excitation systems. EX2100e builds on 

the EX2100 experience of over 700 units in gas, steam, and 

hydro applications for new units and upgrades, in addition to 
GE’s 40 years of experience with over 6,000 excitation 

systems in 70 countries. 

 
The “e” designates enhanced technology with a new 

controller from the Mark* VIe controller family and ControlST* 

software suite for commonality with GE’s family of plant 
control systems. In addition, the EX2100e offers a brushless 

dual redundant regulator option for cost effective reliability. 

 

Architecture

 

The system consists of one or multiple controllers, a 

protection module, power conversion bridges, and the power 

magnetics / transformers. Typical functions performed in the 
controller and protection system include: 

Control 
•  Automatic voltage regulator 

-  Reactive current compensator 

-  Volts per hertz limiter 

-  Overexcitation limiter 
-  Underexcitation limiter 

•  Manual field voltage regulator 
 

Protection 
•  Volts per hertz, dual level (24EX) 
•  Loss of excitation (40EX) 
•  Bridge ac voltage phase unbalance (47EX) 
•  Generator overvoltage (59EX) 
•  Off/online overexcitation (76EX) 

 

The software can also include the power system stabilizer 

(PSS). This enables the generator to produce and transmit 
more power in a stable manner by reducing low frequency 

rotor oscillations. Power system studies are available to 

optimize the tuning of the stabilizer for the best performance. 
These studies include computer simulations for transient 

stability analysis. Field testing services are also available for 

commissioning to verify and document system performance 
to existing specifications.

 

 

 
 

 

 

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Redundancy

 

Gas turbine-generators (7 and 9FA, FB, and H class) have 
potential source (bus fed) static excitation controls with 

power potential transformers to step down the bus voltage to 

a suitable voltage for the excitation controls. These controls 
are normally supplied with either a full multi-bridge or a 

warm backup for redundancy to maximize system reliability. 

Redundant controls include online repair capability for circuit 
boards and power supplies. Multi-bridge units can support 

online repair of the power conversion bridges. Units with 

redundant rectifier cooling fans can also be replaced online 
to support equipment availability. 

 

MS6001B, 6001FA, 7001EA, and 9001E gas turbine generators 
usually have brushless excitation controls with an ac-rotating 

generator connected to the shaft of the main generator. 

These units are equipped with EX2100e excitation control 
brushless regulators. They are normally supplied as simplex, 

non-redundant, control systems, but are also available in 

warm backup configuration for redundancy. They share the 
same overall control design and software features as static 

exciter systems for consistency. Gas turbines contain: 

 

Redundancy 

MS9001H 
MS7001H 

MS9001FB 

MS7001FB 
MS9001FA 

MS7001FA 

Potential source static 
exciter 

Multi-bridge 

MS9001E 

MS7001EA 
MS6001FA 

MS6001B 

Brushless regulator 

(typical) 

Simplex and warm 

backup option 

 

GEA-S1240 

fact sheet