13-10-2012, 03:57 PM
QUANTIFYING TRANSMISSION LINE LOSSES SAVINGS (DEMAND AND ENERGY)
QUANTIFYING TRANSMISSION.ppt (Size: 285.5 KB / Downloads: 30)
Introduction
Transmission line losses (real-watts, reactive-vars) are physical phenemona that occur in the real operation of the system.
Transmission line losses are part of the load-demand and energy-and the demand carries a 15-16% reserves.
Transmission line losses are an expense to the utility – generation demand costs and energy costs.
New/future transmission lines provide an opportunity to look at the economics of transmission line losses to perhaps build a better new transmission line that can fit well into the future.
Losses Savings
How do we study it?
Beginning with a base case, use the power flow model to look at alternatives – one power flow per alternative.
The power flow model gives a control area MW losses summary – compare losses summaries of each alternative.
Use the control area losses summary – a transmission line change affects the impedance (and voltage angles at the substations) of the whole area which affects each of the current flows in the area and thus affects the losses of the whole area.
Losses Savings
For each alternative, consider the change in MW losses from the base case and choose the alternative with the minimum losses summary and thus gives the greatest losses savings.
To the MW losses savings, add a 15-16% reserve.
Conclusion
The incremental cost to build Alt 1 Mod is $26 million.
The benefit/cost ratio = $70.1/$26 = 2.7
The $70.1 million in transmission line losses savings can justify the project.
The incremental cost to build Alt 5 Mod is $54 million.
The benefit/cost ratio = $180.3/$54 = 3.34
The $180.3 million in transmission line losses savings can justify the project.