Integration of steam turbine controls into power plant systems

The unique control and protection requirements of steam turbines are described, and the concept of a unit control system, which by itself is capable of starting, loading, and unloading, as well as protecting, a steam turbine through all operational phases, is introduced. The unit control then interfaces to the plant control at a level where the speed of response and degree of security of a plantwide network is acceptable for the turbine. Examples of unit controls for different types of turbines are given, together with methods for interfacing to plant control systems