Steam Turbine Control SystemRetrofits 

Existing Instrumentation
TDS retains compatibility with OEM-supplied instrumentation, including LVDTs, flow divider pickups, and servos, ensuring a seamless retrofit without the need for expensive valve upgrades.

Inlet Pressure Control
TDS’s advanced inlet pressure control algorithms regulate drum pressure and optimize steam utilization. When multiple turbines operate in parallel, the system dynamically adjusts integral action to maintain efficiency without interference​.

Initial Pressure Loss Control
A Rate-Sensitive Initial Pressure Loss Controller automatically adjusts control valves to compensate for rapid boiler pressure drops, reducing water induction and maintaining system stability.

Extraction Pressure Control
TDS has enhanced extraction pressure control with single and double automatic extraction control. Operators can manually set extraction pressure and flow limits, which are defined as a percentage of theoretical extraction flow. This scheme is fully integrated with V1, V2, and V3 valves to provide a zero-effect transition across extraction headers​.

Admission Pressure Control
The admission pressure control system can be combined with extraction pressure control, enabling optimized steam management for machines requiring both functionalities.

Exhaust Pressure Control
This algorithm controls steam header pressure in letdown station applications. The integral action can be disabled when multiple devices manage the same header, preventing conflicts.

Speed Control
The proportional speed control system operates with integral action when offline and provides real-time acceleration adjustments during startup. This ensures smooth transitions and meets IEEE requirements for primary overspeed protection.

Load Control
Load control functions as the default controller when the turbine is online. Operating as open-loop control, it is calibrated to maintain output as a percentage of the theoretical load.

Megawatt Control
This closed-loop load control system utilizes feedback from dedicated transducers (4-20mA) or digital protection relays with Modbus communications, offering improved precision and response time​.