Two generating units rated for 500 MW and 400 MW have governor speed regulation of 6.0 and 6.4 percent, respectively, from no-load to full-load, respectively. The generators are operating in parallel and share a load of 600 MW. Use a common base of 1000 MVA and assuming free governor action, justify: i) the new governor speed regulation. ii) the load shared by each unit.

A synchronous generator of 100 MVA, 14.4kv, power factor 0.8 lagging, connected in Y, has a resistor in the armature negligible, a synchronous reactance of 1.0 per unit and a speed drop of 3%. The generator is connected in parallel with an infinite bus of 60hz and 14.4kv.   a) What is the synchronous reactance of the generator in ohms? b) what is the internal voltage generated in nominal conditions? c) what is the frequency without load of the generator so that it delivers the nominal power of the system? d) Assume that the generator initially operates at nominal conditions. if it decreases 5% generated internal voltage Ea, what will be the new armature current Ia?

How do FACTS (Flexible Alternating Current Transmission Systems) devices improve power system control and stability?