Renewable energy bases in Desert-Gobi-Wasteland (DGW) areas connected with high-voltage direct current (HVDC) transmission systems show notable weak-grid features

including low inertia

weak damping and a low short-circuit ratio. This results in strong active power–voltage (P–V) coupling effects

making existing real-time active power control methods ineffective. To tackle this problem

this paper proposes a real-time active power control method that simultaneously considers static voltage security constraints and the effective regulation space of various resources. The method ensures safe and stable system operation while efficiently using regulation resources. First

the causes of the strong P–V coupling effects in weak HVDC sending-end AC power systems integrated with renewable energy sources are analysed. Sensitivity indices are used to measure the degree of coupling under different operating conditions. Next

considering the impact of uncertainties in renewable energy output on identifying system voltage weak points

combined with the impedance modulus margin indicator (IMMI)

a voltage weak point identification approach based on probabilistic power flow is proposed. The effects of active power regulation from resources such as wind power

photovoltaic and HVDC links on these weak points' voltages are analysed and a quantitative method for active power regulation space of multiple resource types

considering static voltage security constraints

is presented. Then

by integrating voltage-active power sensitivity and the effective regulation capacity of various resources

a real-time active power control strategy is designed. This strategy incorporates resource prioritisation and differentiated power dispatch

aiming to meet active power regulation needs while reducing negative impacts on voltages at weak points. Finally

the effectiveness of the proposed approach is validated using a modified IEEE 30-bus system and a modified IEEE 57-bus system.