Steam turbine control
A method for operating a steam turbine where steam turbine has at least two sub-turbines, wherein the steam turbine is paired with a steam turbine controller which has a sub-turbine controller for each of the sub-turbines, and each sub-turbine controller compares respective target values with respective actual values of the respective sub-turbine during operation in order to determine a respective control deviation for each sub-turbine.
1. A method for operating a steam turbine, wherein the steam turbine has at least two subturbines, wherein the steam turbine has an associated steam turbine controller that has one subturbine controller for each of the subturbines, the method comprising:
comparing, via each subturbine controller, respective setpoint values with respective actual values of the respective subturbines during operation in order to determine a respective control error for the respective subturbine, wherein the subturbine controllers operate the respective subturbines according to different modes of operation, wherein a respective power value is set in one of the modes of operation using one of the subturbine controllers,
actuating, via the subturbine controllers, respective turbine valves that are associated with the respective subturbines,
controlling, via the respective turbine valves, individual process variables comprising pressure of the respective subturbine, power of the subturbine, and thermal stress or drop in thermal stress of the subturbine, independently of one another.
2. The method as claimed in claim 1 ,
wherein a respective pressure value is set in one of the modes of operation using one of the subturbine controllers.
3. The method as claimed in claim 1 ,
wherein a respective temperature value is set in one of the modes of operation using one of the subturbine controllers.
4. The method as claimed in claim 1 ,
wherein the respective subturbine controllers used are PID controllers.
5. A steam turbine, comprising:
at least two subturbines, and
a steam turbine controller associated with the at least two subturbines, the steam turbine controller comprising one subturbine controller for each of the at least two subturbines,
wherein each subturbine controller is designed to compare respective setpoint values with respective actual values of the respective subturbine during operation in order to determine a respective control error for the respective subturbine, wherein the subturbine controllers are designed to operate the respective subturbines according to different modes of operation, wherein one of the subturbine controllers is designed to set a respective power value in one of the modes of operation,
wherein the subturbine controllers are designed to actuate respective turbine valves that are associated with the respective subturbines,
wherein the respective turbine valves control individual process variables comprising pressure of the respective subturbine, power of the subturbine, and thermal stress or drop in thermal stress of the subturbine, independently of one another.
6. The steam turbine as claimed in claim 5 ,
wherein one of the subturbine controllers is designed to set a respective pressure value in one of the modes of operation.
7. The steam turbine as claimed in claim 5 ,
wherein one of the subturbine controllers is designed to set a respective temperature value in one of the modes of operation.
8. The steam turbine as claimed in claim 5 ,
wherein the respective subturbine controllers are PID controllers.
9. A steam turbine controller for a steam turbine having at least two subturbines, the steam turbine controller comprising:
one subturbine controller for each of the at least two subturbines,
wherein each subturbine controller is designed to compare respective setpoint values with respective actual values of the respective subturbine during operation in order to determine a respective control error for the respective subturbine, wherein the subturbine controllers are designed to operate the respective subturbines according to different modes of operation, wherein one of the subturbine controllers is designed to set a respective power value in one of the modes of operation,
wherein the subturbine controllers are designed to actuate respective turbine valves that are associated with the respective subturbines,
wherein the individual turbine valves control individual process variables comprising pressure of the respective subturbine, power of the subturbine, and thermal stress or drop in thermal stress of the subturbine, independently of one another.