This paper presents a comprehensive impedance modeling approach for constant power load (CPL) during line failure in a grid-integrated variable speed drive system. The study focuses on the voltage stability of the grid-side converter (GSC) and the impact of line failure on the load bus. The GSC is modeled with the machine-side converter (MSC) simplified as a CPL, and the input admittance of the GSC is analyzed to understand its negative incremental behavior, which can lead to voltage instability. The study uses Nyquist-based stability analysis to assess the impact of line failure and negative incremental input admittance on voltage stability. The feasibility of implementing a phase-locked loop (PLL) for grid disturbances is investigated, as well as the possibility of integrating a static VAR compensator (SVC) with a battery energy storage system (BESS) on the load bus to enhance transient stability. The paper discusses the dynamic behavior of crane loads (CPLs) under grid disturbances, the voltage stability analysis at the load bus, and the effect of line failure on transient voltage stability. It proposes a method to adjust the PLL bandwidth in the presence of an equilibrium point and a method to integrate SVC with BESS on the load bus in the absence of an equilibrium point. The study also explores the impact of PLL bandwidth adjustment on grid strength and power, and the integration of BESS-SVC for improved transient stability. The results show that increasing the PLL bandwidth improves system stability, and the integration of BESS-SVC enhances the system's ability to maintain voltage stability during line failures. The study concludes that the proposed methods are effective in improving the transient stability of the grid during line failures.This paper presents a comprehensive impedance modeling approach for constant power load (CPL) during line failure in a grid-integrated variable speed drive system. The study focuses on the voltage stability of the grid-side converter (GSC) and the impact of line failure on the load bus. The GSC is modeled with the machine-side converter (MSC) simplified as a CPL, and the input admittance of the GSC is analyzed to understand its negative incremental behavior, which can lead to voltage instability. The study uses Nyquist-based stability analysis to assess the impact of line failure and negative incremental input admittance on voltage stability. The feasibility of implementing a phase-locked loop (PLL) for grid disturbances is investigated, as well as the possibility of integrating a static VAR compensator (SVC) with a battery energy storage system (BESS) on the load bus to enhance transient stability. The paper discusses the dynamic behavior of crane loads (CPLs) under grid disturbances, the voltage stability analysis at the load bus, and the effect of line failure on transient voltage stability. It proposes a method to adjust the PLL bandwidth in the presence of an equilibrium point and a method to integrate SVC with BESS on the load bus in the absence of an equilibrium point. The study also explores the impact of PLL bandwidth adjustment on grid strength and power, and the integration of BESS-SVC for improved transient stability. The results show that increasing the PLL bandwidth improves system stability, and the integration of BESS-SVC enhances the system's ability to maintain voltage stability during line failures. The study concludes that the proposed methods are effective in improving the transient stability of the grid during line failures.