System features

The most generator sizes and types covered

GE Vernova’s EX2100e excitation control system is a software-enabled generator control system applicable for steam (including nuclear), gas, and hydro generators. The EX2100e has configurations for both new installations and retrofit of existing systems. EX2100e control hardware and software is an integral part of the Mark* VIe control product line.


Integral with Mark VIe Controls

Integration between excitation systems, turbine control, static starter, distributed control systems (DCS), and the human-machine interface (HMI) is seamless, requiring no third-party interfaces or gateways.

For stand-alone retrofit applications, tight integration with plant control systems is enabled through multiple protocols including Modbus/TCP or hardwired.


A comprehensive approach for continuous operations

High-performance, intuitive software tools

The EX2100e uses the ControlST* software suitewhich contains several high-performance tools for easy use from both operation and maintenance personnel.

These include:

  • ToolboxST* application for configuration and diagnostics
  • WorkstationST* for management of HMI and Historian functions
  • CIMPLICITY* graphics user interface

Seamless integration provides direct connectivity from parameters on operator screens to their corresponding alarm history, trends, logic diagrams, watch windows, and browsers.

Presenting data in a meaningful context

ControlST integrates vital data throughout the plant—including data from external systems that would otherwise be unavailable—and presents it in a meaningful context, reducing system costs.

Armed with the right information at the right time:       

  • Engineers can more effectively analyze process trends and adjust control software.       
  • Operators can more quickly respond to alarms and operational disruptions.
  • Maintenance teams can pinpoint problem areas, react proactively, and keep processes online.

The ControlST software suite includes several high-performance tools:

  • WorkstationST* HMI and Historian communication software
  • ToolboxST* process configuration and diagnostic software for process, safety integrity level (SIL), excitation, and power conversion
  • TrenderST* provides integrated real-time and historical data combined with sequence-of-events (SOE) and alarm points
  • AlarmViewer delivers ISA 18.2 compliant alarm management
  • Other packages for efficient plant-wide communications, monitoring, and asset management

Regulators for rotating exciters

The EX2100e product family includes simplex and redundant automatic voltage regulator systems, typically used for smaller excitation currents. This solution is specifically designed to address all sizes of generators and embeds all the necessary control, limitations, and protection to help the generator operate safely. This flexible excitation product can be customized to retrofit most configurations.

Static excitation systems

For higher excitation currents, the thyristor-based EX2100e static excitation systems are available in several configurations to provide flexibility and to economically meet field current requirements. Its control architecture features a simplex configuration or redundant (triple modular redundancy) configuration combined with converter redundancy (warm backup, n-1, n-2) for highest availability.

Generator control panel

EX2100e automatic voltage regulators can be integrated with synchronization and protective devices to provide a complete generator control and protection solution.

Advanced algorithms

EX2100e excitation systems offer highly advanced algorithms to:

  • Tackle challenges created by the fundamental change of the power generation industry      
  • Enhance generation asset reliability

Combination with static starter

For gas turbines, GE Vernova offers a combined package of an EX2100e excitation system and an LS2100e static starter, both featuring the Mark VIe control system. This highly integrated solution offers efficient and reliable gas turbine operation.


Modernizing aging generator controls with the EX2100e

EX2100e digital front-End (DFE) control upgrade

GE Vernova offers our customers with aging excitation control systems the option to upgrade to our EX2100e Digital Front-End (DFE), a controls-only retrofit that offers a fully digital platform at a fraction of the time and cost of a conventional excitation control system upgrade.

By retaining your existing power conversion bridges, this retrofit delivers a low-impact cost-effective option to modernize aging controls while driving additional return on your controls investment.

Retrofits for gas, steam and hydro turbine generator excitation control systems

With an expanding portfolio of advanced generator control & protection platforms and services, we provide design, installation, and commissioning services with experience gained from over 2,000 gas, steam, and hydro turbine upgrades in more than 70 countries.

The GE Vernova team works with customers to deliver modernization solutions across a wide range of excitation applications with offerings structured to meet both technical and budget requirements. 

As standalone generator control project or integrated with the GE Mark™ control platform, GE Vernova can tailor flexible retrofit solutions from a global team of experts in the control and protection of critical generating assets.

Offerings include:

  • A variety of excitation configurations to optimize retrofits
  • Hardware, software, and integration engineering
  • Application expertise to support custom solutions
  • Engineering Design Packages (EDP) – Installation design and documentation
  • Single point system responsibility – PPT, cable, bus, networks, enclosures
  • Comprehensive PSS and IEEE Modeling documentation and validation services
  • Installation Services – Project management, installation, and commissioning services
  • Expert integration of excitation systems with the balance of turbine-island and plant controls
  • Nuclear retrofit packages and DCN support

Alterrex upgrade solutions

While the Alterrex excitation control system stood as an industry standard for nearly 30 years, technology and operating demands have changed. It’s time to modernize.

We offer a comprehensive set of control and mechanical modernization options to help ensure the performance of your Alterrex systems. 

The EX2100e Alterrex Regulator replacement provides precise control and protection for your main generator and the Alterrex alternator.

Our drop-in Alterrex rectifiers feature modern flat-pack diodes, machined billet aluminum heat sinks, and all stainless-steel fluid path and fittings for a virtually maintenance-free replacement.

And while the Alterrex utilizes the highly reliable stator water cooling (SWC) system to cool the fixed diodes, adding our dual Alterrex SWC filter assembly can enhance reliability.

Engineering design packages

Successful generator control system retrofits require more than just hardware. We specialize in integrating new controls into existing plant infrastructure. Our multi-disciplinary team of experienced engineers and designers are happy to tailor controls retrofits for your unique situation. 

Our scalable Engineering Design Package (EDP) is tailored to meet your critical planning and execution requirements with greater efficiency, improved safety, less risk, and lower total costs. Depending on the complexity of your project, this may include:

  • Wiring transition tables
  • General arrangement and equipment layout options
  • Demolition drawings
  • Electrical and system designs that include routing, material lists, and detailed installation drawings
  • Civil and mechanical designs for verification and/or modification of plant structure, and installation of new equipment
  • Updates of existing plant drawings for new equipment
  • Subcontractor specifications for materials and development of work packages
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