Power System Operation and Control

COMPETITIVE EXAMINATION QUESTIONS

1. The incremental cost characteristics of two generators delivering 200 MW are as follows:

   dF₁/dP₁ = 2.0 + 0.01 P₁    dF₂/dP₂ = 1.6 + 0.02 P₂. For economic operation, the generators P₁ and P₂ should be    (G2000)

   1. P₁ = P₂ = 100 MW
   2. P₁ = 80 MW,   P₂ = 120 MW
   3. P₁ = 200 MW,   P₂ = 0 MW
   4. P₁ = 120 MW,   P₂ = 80 MW
2. A power system has two synchronous generators. The governor – turbine characteristics corresponding to the generators are    (G2001)

    

   P₁ = 50 (50 − f)    P₂ = 100 (51 − f)

    

   where f denotes the system frequency in Hz, and P₁ and P₂ are respectively, the power outputs (in MW) of turbines 1 and 2. Assuming the generators and transmission network to be lossless, the system frequency for a total load of 400 MW ...