ABSTRACT
A power system consists of classical generators or renewable energy sources, loads, and transmission and distribution networks. The installed generating capacity of a power system must equal the peak load demand plus a spinning reserve. A power system is connected through tie-lines to import/export power to/from neighboring systems. The control engineers are striving to maintain the power system in a normal state. Ensuring constant frequency is a crucial factor for satisfactory operation of power systems and is essential for industry operation and production. The load-frequency control (LFC) has a secondary control action working in a slow reset mode to eliminate the frequency error and control the power interchange between generators. The turbine is responsible for converting the valve/gate position into mechanical power on the shaft coupled to the generating unit. There are many types of turbines that can exist in a power system such as non-reheat steam, reheat steam, hydro, gas, and combined cycle turbines.
