FLEXIBLE AC TRANSMISSION SYSTEM FACTS
A flexible transmission system is akin to high voltage dc and related thyristors developed and designed to overcome the limitations of the present mechanically controlled ac power transmission system. Â The use of high-speed power electronics controllers gives 5 opportunities for increased efficiency.
- Greater control of power so that it flows in the prescribed transmission routes.
- Secure loading (but not overloading) of transmission lines to levels nearer their required limits.
- Greater ability to transfer power between controlled areas, so that the generator reserve margin- typically 18 % may be reduced to 15 % or less.
- Prevention of cascading outages by limiting the effects of faults and equipment failure.
- Damping of power system oscillations, which could damage equipment and or limit usable transmission capacity.
A flexible system requires tighter transmission control and efficient management of inter-related parameters that constrain today’s system including:
- Series impedance- phase angle.
- Shunt impedance- occurrence of oscillations at various frequencies below rated frequency.
This results in a transmission line operating near its thermal rating. For E.g. a 1000kv line may have a loading limit 3000-4000Mw .but the thermal limit may be 5000Mw.
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