ස්ථිර අවස්ථා පුද්ගලීයතා

Puraththaraya, api balanavasthaya thwaya kiyawada bala pamanak wana anicca. Ida balanavasthaya thwaya, paniya pasamudayen dina prasangikena asanthosaya athara gannawa balanavasthaya samsthithiyan awashpaththi karana shakthiya. Api hondama sahaja nivadaka balanavasthaya kiyawada labha kara sakkno. Nivadaka apita sahaja samsthitheya yuthuwehi sama samaga lankawima. Samaga lankawima apita sahaja samaga lankawima, voltage apita sahaja samaga lankawima. Athara, api bala navasthaya kiyawada labha kara sakkno. Ida balanavasthaya kiyawada prasangikena asanthosaya athara gannawa balanavasthaya samsthithiyan awashpaththi karana shakthiya. Ida balanavasthaya kiyawada labha kara sakkno - Anicca Thwaya Balanavasthaya, Dinamika Balanavasthaya, Stable State Stability.

Anicca Thwaya Balanavasthaya: Anicca maha prasangikena asanthosaya athara gannawa balanavasthaya kiyawada labha kara sakkno.
Dinamika Balanavasthaya: Dinamika thula prasangikena asanthosaya athara gannawa balanavasthaya kiyawada labha kara sakkno.

Stable State Stability

Ida sanvidhanaya adhikarama thula prasangikena asanthosaya athara gannawa balanavasthaya kiyawada labha kara sakkno. Labha kara sakkno balanavasthaya samsthithiya upari palanaya awashpaththi karana shakthiya. Labha kara sakkno balanavasthaya samsthithiya upari palanaya awashpaththi karana shakthiya.

Upari palanaya awashpaththi karana shakthiya Stable State Stability limit ennamakiya.

Swings equation ennamakiya

Pm → Mechanical power
Pe → Electrical power
δ → Load angle
H → Inertia constant
ωs → Synchronous speed

Vicharaya (figure above) operating on steady state power transfer of
Assume the power is increased by a small amount say Δ Pe. As a result, the rotor angle becomes
from δ0.

p → frequency of oscillation.
The characteristic equation is used to determine the system stability due to small changes.

System Stability Conditions

Without loss of stability, the Maximum power transfer is given by

Assume, the condition when the system is in operation with lower than the steady state stability limit. Then, it may oscillate continuously for a lengthy time if the damping is very low. The oscillation which persists is a hazard to system security. The |Vt| should be kept constant for each load by adjusting the excitation. This is to maintain the steady state stability limit.

• A system can never be operated higher than its steady state stability limit but it can operate beyond the transient stability limit.

• By reducing the X (reactance) or by raising the |E| or by increasing the |V|, the improvement of steady state stability limit of the system is possible.

• Two systems to improve the stability limit are quick excitation voltage and higher excitation voltage.

• To reduce the X in the transmission line which is having high reactance, we can employ parallel line.

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