Steam Turbine Control

Steam Turbine Control

Rapidly and continuously changing technological processes require reliable high-speed systems with an emergency shutdown (ESD) function.

The Thyone solution for steam turbines was developed as a system with redundant configuration, extended to cover maximum availability. The system can automatically control a steam turbine in standard and emergency modes (of generation unit and of the power system), while monitoring load, live-steam pressure, positions of the control valves, signals from control devices at power unit/station/system.

Range of turbines to be used with Thyone varies from the small turbines for industrial applications to the large 800 MW and more powerful turbines for power generation for the grid distribution. The solution can be used with the steam turbines for the power unit participation in primary and secondary frequency control.

The redundancy is implemented at the levels of PLC, control, measurement equipment. And the solution provides timely diagnostics of the individual systems and control circuits of the actuators.

Implementation of the solution with the use of REGUL R600 (R500) PLCs allows a flexible configuration, connection to a remote SCADA (with support of the most common vendors on the market). Hot-standby operation of the CPU units and hot-swappable modules allow for a stable and continuous operation of the system.

Solution components *

  • Control cabinet based on PLC REGUL R600 (R500)
  • Power cabinet
  • Drive-control cabinet(s)
  • Operator workstation(s)
  • A set of sensors and actuators

* The equipment’s configuration varies depending on the details of the specific project.

Main functions

  • Steam pressure control, with alignment to the power system frequency
  • Pressure control throttle (adjustment of live-steam pressure before the turbine)
  • Protection of the turbine against an inappropriate reduction in steam pressure in units with rated or variable steam pressure
  • Sliding pressure operation (control mode with variable live-steam pressure)
  • Activation of the turbine’s control valves when the electrical load is dropped
  • Activation of the control and shutoff valves in case of increased frequency and acceleration
  • Turbine shutdown (via relay channel) without disconnecting the generator from the grid
  • Control of turbine rotation speed
  • Short- and long-term emergency load release of the power unit, with restoring load by the signals from emergency automation. By the conditions for dynamic and static stability.

At the core of the Thyone solution is DA 03 011 custom-designed pulse counter/frequency module with integrated software algorithms and frequency generator. Depending on the selected internal subprogram, it can:

  1. Measure frequency over three channels in two ranges (up to 10 and up to 500 kHz).
  2. Provide turbine overspeed protection, together with TMR electronic overspeed trip; verify protection state on a stopped turbine or during idling from a built-in generator.
  3. Receive signals from an incremental encoder (control of the actuator position).
  4. Receive signals from flow meters and control calibration setting for flow meter calibration.

Major Technical Features

  • Deep system diagnostics
  • 100% redundancy (including RTU modules)
  • Generation of control actions in 10 ms
  • Protection against issuing false control signals
  • Archiving in 10-ms, 100-ms, and 1-s intervals
  • Implementation of hot redundancy of control channels for 20 ms
  • Hot-swapping of modules
  • Heavy-duty operating conditions
  • Mean time between failures of at least 100,000 hours

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