Multi-constraint Voltage Stability Risk Assessment Method Based on Dynamic Coupling Mechanism

Existing large-scale renewable energy bases in desert regions exhibit weak dynamic voltage support capability, posing significant post-contingency voltage instability risks​to power systems. Conventional studies predominantly rely on multiple-two-element notation criterion​to quantify voltage deviations across temporal and spatial dimensions, yet fail to characterize the dynamic voltage trajectory post-fault, leading to insufficient assessment accuracy. To address these limitations, this paper proposes a multi-constrained voltage stability risk assessment method​based on dynamic coupling mechanisms. Building upon traditional multiple-two-element notation criterion, our approach incorporates the​coupling relationship between voltage change rate and system dynamic reactive power support capability. By introducing​post-fault voltage change speed as a critical influencing factor, we amplify risk visibility during transient voltage excursions. Experimental results demonstrate that the proposed methodology achieves effective assessment of voltage stability margins, significantly improving prediction robustness for desert regions grid scenarios under fault conditions.