Question

2. (a) A 50-Hz power system consists of two areas connected by a tie-line with parameters given in Table 1. Table 1 Area 1 2 ? $\beta_1 = 20$ pu $\beta_2 = 40$ pu D $D_1 = 0.5$ pu $D_2 = 0.6$ pu Base Power 800 MVA 500 MVA The generators in both areas are initially operating in parallel at the nominal frequency of 50 Hz. A sudden load decrease of 367 MW occurs in Area 1. On a common base power of 1000 MVA, determine the steady-state frequency deviation, the change in frequency-dependent loads in both areas, the change in tie-line flow and state the direction of the tie-line flow. Express your answers in per unit. (11 Marks)

          2.
(a) A 50-Hz power system consists of two areas connected by a tie-line with parameters
given in Table 1.
Table 1
Area	1	2
?	$\beta_1 = 20$ pu	$\beta_2 = 40$ pu
D	$D_1 = 0.5$ pu	$D_2 = 0.6$ pu
Base Power	800 MVA	500 MVA
The generators in both areas are initially operating in parallel at the nominal
frequency of 50 Hz. A sudden load decrease of 367 MW occurs in Area 1. On a
common base power of 1000 MVA, determine the steady-state frequency deviation,
the change in frequency-dependent loads in both areas, the change in tie-line flow
and state the direction of the tie-line flow. Express your answers in per unit.
(11 Marks)

2.
(a) A 50-Hz power system consists of two areas connected by a tie-line with parameters
given in Table 1.
Table 1
Area 1 2
? β1 = 20 pu β2 = 40 pu
D D1 = 0.5 pu D2 = 0.6 pu
Base Power 800 MVA 500 MVA
The generators in both areas are initially operating in parallel at the nominal
frequency of 50 Hz. A sudden load decrease of 367 MW occurs in Area 1. On a
common base power of 1000 MVA, determine the steady-state frequency deviation,
the change in frequency-dependent loads in both areas, the change in tie-line flow
and state the direction of the tie-line flow. Express your answers in per unit.
(11 Marks)

Added by Lisa C.

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