The large-scale integration of renewable energy sources with high penetration levels and strong randomness often leads to overloading of AC transmission lines. Meanwhile

in power system upgrading and construction

the controllability of the embedded voltage source converter-based high voltage direct current (VSC-HVDC) systems has not been fully exploited. To address this issue

this paper proposes a power sensitivity analysis-based embedded VSC-HVDC emergency control (SEC) to mitigate transmission overloading. First

an AC-DC power sensitivity matrix incorporating embedded VSC-HVDC is established based on the system model. Then

during real-time operation

the active power of the VSC-HVDC is adjusted to address specific AC grid overloading according to the derived sensitivity matrix. During the adjustment process

an optimization-based control method is used to minimize the total variation in DC adjustment while keeping the active power of AC transmission lines within acceptable limits. Finally

simulation verification is carried out using a modified IEEE benchmark 39-bus system

demonstrating that the proposed SEC can address AC grid overloading under various grid fault scenarios and ensure the safe operation of the entire network.