An Improved Electromagnetic Transient Model Parallel Algorithm Based on z-Domain Stability Analysis

The accuracy of electromagnetic transient of power systems mainly depends on whether the model of the system, the parameters of the components and their parametric characteristics are consistent with those of the real network components. The equivalent theory of electromagnetic transient simulation is a resistive network model, which converts the inductance and capacitance equivalence into the parallel connection of current sources and resistors. In this paper, based on the introduction of z-domain stability, the necessary stability criterion is proposed, and the stability criterion of resistive network is derived according to Dommel-Bergeron's analytical method for stability analysis to determine whether the two subsystems are used as a current-injection device or voltage-injection device, respectively. Then, a comprehensive method for network interface simulation is proposed to enhance the numerical stability of the partitioned interface under parallel algorithm by modifying the partitioned interface model of the equivalent resistive network system. It is a generalized interface model with stability guarantees of RLC networks. Finally, the proposed method is demonstrated to improve the stability of the resistive network by simulating the equivalent resistive network operation using stochastic gradient ascent numerical optimization algorithm on MATLAB/Simulink.