Preliminary design analysis of tie-line bias control of reactive power

Generator output and reactive power controls must respond to system disturbances, including changes in system loads and loss of generators or tie lines. This paper describes a novel approach to voltage and reactive power control (VQC) called reactive tie-line bias control (Q-TBC) that is analogous to the tie-line bias control often used for load frequency control (LFC). The Q-TBC regulates a pilot voltage and reactive tie-line flows of a reactive control area by switching capacitors and reactors. A simulation model, which includes both LFC and VQC, has been developed. Sample simulation results show the impact of the Q-TBC on tie-line reactive power flow and bus voltage.