In China's regional power grids

Tie-Line Bias Control (TBC) mode is predominantly utilized. This control scheme

where provinces individually assume responsibility for frequency regulation and real-time power balance

does not allow sharing of frequency regulation resources

and is unable to cope with increasing uncertainty of renewable generation and risks of power losses. To address this issue without altering the existing TBC control framework

this paper proposes a mechanism for cross-provincial coordination of frequency regulation resources within a regional power grid

along with a supporting frequency control strategy for interconnected power systems. The proposed mechanism enables frequency regulation sharing among the buyer province

seller province

and regional grid operator without the need for real-time communication among the three parties

thereby meeting the stringent requirements for real-time performance and flexibility. Simulation results demonstrate that the proposed mechanism and strategy effectively reduce area control error and frequency deviation in the interconnected grid

achieving optimized allocation of frequency regulation resources within the regional power system.