Lecture 25 :
Analysis of Power Swings in a Multi – Machine System
Example 1
For the system shown in fig 25.3, determine the two port equivalent and find out whether the power swing locus passes through
(a)
transmission line ‘c'
(b)
transmission line ‘b'
Solution:
(a)
In order to analyze whether the power swing will pass through the transmission line ‘c', we need to develop a two
machine equivalent across the line. For that, the transmission line ‘c' is disconnected from the network and Zbus matrix is formed.
Let us form the nodal admittance matrix or Ybus for the given system with transmission line ‘c' disconnected.
