GETCO Exam Paper (22-07-2015)
The Y bus matrix is a sparse matrix because …

Y primitive is a sparse matrix
no of lines are less
lines are connected to less no. of buses
bus incidence matrix is a sparse matrix

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GETCO Exam Paper (22-07-2015)
Which of the following is a reason to decouple AVR and LFC loops when there is a shortage of reactive power?

angle of the voltage is not considered
AVR loop response is slower than LFC loop
Change in voltage magnitude marginally affects real power
deference of error is the main reason

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