Gas Turbine Control System Retrofits 

Existing Instrumentation
In most cases, the existing instrumentation on the turbine can be reused. No expensive valve upgrades are required since the system fully integrates with OEM-supplied LVDTs, flow divider pickups, and servos. TDS ensures redundancy in instrumentation, including LVDTs, servo coils, and magnetic pickup inputs, to enhance reliability.

Flame Scanner Upgrade
Existing UV sensors, such as Honeywell models, are expensive and require specialty interfaces. TDS can upgrade flame scanners to third-party systems for increased turbine reliability and performance.

Temperature Control
TDS has implemented both isothermal exhaust temperature control and biased temperature control algorithms. Biases include water flow, compressor discharge pressure (CPD), compressor pressure ratio (CPR), ambient temperature, compressor discharge temperature, air humidity, load, and fuel demand. The system dynamically applies the appropriate biases based on operational conditions. As an option, customers can distribute exhaust thermocouples across multiple modules to minimize the impact of sensor failure on temperature control.

Load Control
TDS has implemented load control algorithms to maintain a stable, pre-selected set point under varying operating conditions.

Speed Control
TDS has implemented a proportional speed droop controller following IEEE standards. Isochronous speed control is available when needed. In DLN machines, where multi-valve system non-linearities affect standard droop settings, closed-loop megawatt droop control is used when online to ensure precise load sharing.

Acceleration Control
TDS has implemented an acceleration controller for gas turbines to ensure smooth and controlled startup. The acceleration set point adjusts dynamically to maintain safe operating limits during startup.

Surge Control
TDS has implemented surge control algorithms that regulate bleed heat, adjust IGVs, and modulate fuel supply to prevent compressor surging. This feature is primarily used in larger frame machines.

Inlet Bleed Heat
TDS has implemented inlet bleed heat control algorithms compatible with OEM designs. The system supports both open-loop controllers (old manifold) and closed-loop control (new manifold) for optimal performance.

IGV Temperature Control
TDS has implemented IGV control algorithms to optimize hydraulic IGV positioning for precise exhaust temperature regulation. In combined cycle machines, this improves efficiency. In DLN machines, IGV temperature control enables stable low-emission operation at reduced loads.

IGV Temperature Matching
TDS has implemented advanced algorithms to regulate exhaust temperature based on external temperature set points. This allows the system to match exhaust temperature to steam turbine chest temperature, reducing thermal stress and enabling faster startups.