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Gas Turbine Power Generation


PROJECT OVERVIEW:

GCS supplied a gas turbine-generator control, monitoring, and fuel metering system for an electric utility provider as a retrofit package on an old outdated control system. The plant utilizes multiple turbines including this Rolls Royce Avon package rated for 10.0 MW @ 60 Hz.

TYPE OF FACILITY
  • Electric Utility Provider
TYPE OF PLANT
  • Prime Power Generation Utility Paralleled in Droop Base Load
PRIME MOVERS
  • Rolls Royce Avon Gas Turbine Inlet Fuel Pressure: 1100 psi 10.0 MW, 13.8 kV, 0.8 PF @ 60 Hz
CONTROL TECHNOLOGIES
  • Woodward GTC250
    Gas Turbine Digital Control System for fuel control (governing), start / stop sequencing, turbine protection, and monitoring. Woodward LQ25 / GS3
    Liquid Fuel Metering Valve with Digital Driver
    Wago Modules
    Remote Input / Output Modules for Signal Expansion
    Bently Nevada 3500
    Independ ent Vibration Monitoring System
    Woodward SPM -D
    Generator Circuit Breaker Automatic Synchronizer
    HMI System
    Dual operator control stations communicating via Modbus TCP /IP. One touch -screen terminal in the control cabinet door and a desktop workstation in the plant control room for monitoring and control of the system.

The control system features the GTC250 Aero-Derivative Digital Gas Turbine Control with custom application software performing functions including automatic turbine start and stop sequencing, fuel control, and turbine protection. The GTC250 control is based on the Woodward Atlas-II hardware platform that includes PC-based technology with an industrial Pentium CPU Processor and on-board solid state hard drive.

The GTC250 interfaces to an electric LQ25 liquid fuel metering valve through a digital GS3 valve driver.
The central control system includes remote I/O modules for field device expansion to include all necessary signals from the gas turbine. An SPM-D synchronizer is used to control the generator circuit breaker in order to bring the generator online. GCS has also included a complete Bently Nevada 3500 vibration monitoring system and packaged the controls in a double-sided, double-bay free-standing control cabinet.

Central monitoring and control is performed via a custom HMI system featuring an industrial grade touch -screen terminal in the control cabinet door along with a second desktop workstation in the plant control room . The HMI s provide the operator with complete system control including star ting, stopping, and synchronization of the turbine


Control System Cabinet
• Single Freestanding Enclosure (72”Wx36”Lx84”H)
• Door Mounted Touch- Screen HMI
• Dual AC Power Supply Feeds
• Redundant DC Power Supplies
• Dedicated Hardwired Safety Trip System

Turbine Control: Woodward GTC250 System
• Fuel Control / Governing
• Automatic Start / Stop Sequencing
• Critical Speed Range Avoidance
• Protection and Alarm Handling
• Interface to Rem ote I/O Module Network
• Interface to GS3/LQ Driver and LQ Actuator
• Ethernet Network to HMI System

Generator Synchronization: Woodward SPM -D
• Dead Bus Control or Live Bus Synchronizing
• Operation Controlled via GTC250 System
• Interface to Automatic Voltage Regulators
Vibration Protection: Bently Nevada 3500
• Protection Independent to GTC250 System
• Low and High Speed Keyphasors
• Accelerometer and Axial Thrust Monitoring
• Dual Turbine Compressor Velocity Sensors
• Power Turbine Vibration Monitoring
• Reduction Gear box Vibration Monitoring
• Ethernet Network to HMI System

HMI / SCADA System
• Control Room Desktop HMI Workstation
• Second HMI Mounted in Control Cabinet Door
• Industrial Grade 17” Color Touchscreen Terminal
• On- Board Solid State Hard Drive (Touch screen)
• Ethern et Communication Network
• System Monitoring and Control
• Control System Integration
• Alarm Handling and Performance Data Trending
• Multiple User Access Levels
• Available Remote Access via the Internet


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