Transient Voltage Stability Assessment of Direct Current Multi-Infeed Receiving-End System Using Binary Table Criterion

Abstract

Establishing a correlation between reactive power voltage dynamic characteristics and transient voltage stability (TVS) is essential for power system analysis. A TVS assessment method founded on a binary table criterion is introduced. Initially, the TVS state is depicted via a critical instability slip. A polynomial fitting approach is then employed to quantify the influence of multiple direct current (DC) control parameters on reactive power. This facilitates the explicit demonstration of how the reactive power dynamic characteristics of line-commutated converter-high-voltage direct current and voltage source converter-high-voltage direct current impact the critical instability slip within a DC multi-infeed receiving-end system. To achieve a quantitative description of the relationship linking DC control parameters to the post-fault TVS state, an index measuring the change rate of the critical instability slip is formulated. This index serves to characterize the TVS of the DC multi-infeed receiving-end system. The dynamic variations of the critical instability slip are quantitatively examined using a binary table, thereby providing a characterization of the TVS margin. By adaptively adjusting the weight based on the slip evolution process following a fault, a more precise and rational depiction of the TVS margin is achieved. Concluding the study, the efficacy and precision of the proposed methodology are validated through simulation analysis conducted on a modified IEEE-68 bus system.