What is the purpose of 'tie-line bias control' in interconnected system operations?
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A
Each control area adjusts generation proportional to both ACE and its frequency bias, preventing over-correction by any single area
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B
Tie lines are physically biased toward higher voltage to reduce losses
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C
Generation units near tie lines are given priority dispatch to reduce congestion
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D
Bias control limits the maximum power flow allowed on inter-area connections