Abstract: In response to the problem of large transient stability analysis errors caused by state equation reduction under power grid fault conditions, this paper adds the cross-coupling analysis of the phase-locked loop and inner current loop on the basis of the energy function method and proposes an inner loop structure with additional speed compensation term. Firstly, the impact of the interaction between the phase-locked loop and the inner loop on the dissipation of the transient energy function was analyzed. Secondly, an inner loop structure with an additional speed compensation term was proposed to enhance the coupling effect between the phase-locked and inner loop, further accelerating the dissipation of transient energy. Once again, indicators were proposed to evaluate the suitability of compensation coefficient selection and a simple coefficient selection strategy was proposed based on the changes in grid voltage. The inner loop of the additional speed compensation term has a good stabilizing effect on the transient stability of the converter, and the conclusions obtained have been verified in the MATLAB/Simulink simulation platform.