Proposed four area interconnected power system with tie-lines.

Optimal CC-2DOF(PI)-PDF controller for LFC of restructured multi-area power system with IES-based modified HVDC tie-line and electric vehicles - ScienceDirect

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Four areas interconnected power system with area control errors

Frequency deviations in four control areas without disturbances

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Integrated multi-area power system with HVDC tie-line to enhance load frequency control and automatic generation control

Interconnected four‐area power system

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Tie-line interconnections (solid lines) and communication scheme

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Transfer function modeling of two area thermal system

A Four Area Tie-Line Model Of AGC System