Basic Theory Of Power Transfer Network Essay examples

1664 Words Oct 11th, 2016 7 Pages

Basic theory of power transfer network

We know that AC lines are operated at voltage level between 10kv to 800kv. The distribution network operates voltage level below the 100kv. For protection against fault circuit breakers are used. Power flow is obtained by receiving end power or sending end power. Ex. Consider a transmission line connected between load centre and generating station. We assume line is loss less and ignore line charging, then the power flow (P) is,

P=V1V2 sin⁡(θ1-θ2)/X

X= transmission line reactance
V1= sending end voltage
V2= receiving end voltage
Assume V1 and V2 are remain constant
Power flow in the transmission line is obtained by the power injected throw power station. If any transmission line trip, then possibility of overloading to the remaining lines. So, to avoid over loading we can reduce output power of generating station by tripping the generators.

1.2 Terms related to uncompensated transmission line

Current control Voltage control Voltage stability Damping oscillation Transient and dynamic stability Fault current limiting Active power control Reactive power control

Voltage stability:

For a stable voltage there must be equal voltage at all busses in power transmission line. Due to instability voltage in transmission line there is an uncontrollable and continuous drop in system voltage. So, removing this effect we compensate the transmission line by different fact controllers.…

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