a 100 MVA study base, create a network given in fig 1 using power world software.
A Transmission line L1 with per-unit length parameters impedance z=0.01067+j 0.116 W/km and y=j1.4 mS/km and L2 with per-unit parameters; impedance z = 0.011+j 0.1 p.u and y = j1.2 m p.u.
Task 1: You are required to investigate the operation of a 100 km (L2) and a 300km (L1) transmission lines. The investigation includes:(50 %weightage)
1.No load operation;
2.Operation during matching;
3.Short-circuit response;
4.Operation with a capacitive load ;
5.Operation with R-L loads.
(Student can connect/disconnect load 1, 2 and 3, they can be used individually or in group for analysis)
Do include a detailed explanation on how the different parameters affect the circuit. Do also include print screen from power world for the different parameter.
Fig 1: Single line diagram of 3 –Phase transmission line model
T4 in the above diagram should be labeled as T3
Task1 simulation network settings:
Ignore the effects of resistance in the system and make any necessary approximations and assumptions required to simplify the design .State any assumptions made. Also, for generator and transformers, select “Neutral Earthling Data” with zero neutral earthing resistance and reactance
Generator:
Generator G1 is a slack generator with 1∠0° p.u. voltage. Neutral grounded.
Transformer:
In parametersàseries reactance
T1 x: 0.15 p.u.
T2 x: 0.12 p.u.
T3 x: 0.1 p.u.
Take note of the primary and secondary connection of transformer
In Fault infoàconfigurationà choose the suitable setting based on fig 1
Transmission line:
In parametersàenter the calculated per unit impedance
Task 2: (30 %weightage)
Using the network created, you are required to perform theoretical calculations to estimate the voltage regulation in Transmission line L1 and L2, comment on the results obtained with regard to voltage regulation observed in network simulation with and without load.
Do include print screen from power world & a detailed write up for the observations.
Task3: (20%weightage)
Comment on the results obtained with regard to the flow of active and reactive power through different parts of the system.
Sample Solution
