To condensor V₁ Voltage Rectifier/ regulator filter Vref Voltage transformer Figure P18. Control system of a steam-turbine synchronous generator 19. A 100 MVA turbine-generator unit operating in a 60-Hz interconnected power system has a regulation constant R=0.05 per unit. Following a load change in the power system without LFC (Load Frequency Control), the frequency changes from 60 Hz to 60.06 Hz in steady state. The change of the turbine-generator output power is a. -2.0 MW b. -1.2 MW c. 2.0 MW 20. A 60-Hz power system consists of two interconnected areas. Area 1 has 1200 MW of generation and an area frequency response characteristic ẞ1=600 MW/Hz. Area 2 has 1800 MW of generation and ẞ2-800 MW/Hz. Each area is initially operating at 50% of its total generation at 60 Hz in steady state. When the load in area 1 suddenly increases by 400 MW. If both areas operate with LFC (Load Frequency Control), the change of the tie-line power flow in steady state are a. Aptie1 = Aptie2 = 0 MW b. Aptie1=-Aptie2 = 171.4 MW c. Aptiez=-Aptie1 = 228.6 MW και