The large-scale integration of renewable energy has profoundly changed the transient characteristics of power systems. It has resulted in traditional electromagnetic transient and electromechanical transient simulation methods beginning to show their limitations. To address this, the shifted frequency analysis-based electromagnetic transient simulation is proposed. By constructing analytic envelope signals, this method enables a significant increase in simulation time steps while preserving accuracy. Following the idea, this paper conducts the models of photovoltaic systems, wind power generation, and large-scale AC grids. The main modeling contributions include a steady-state initialization strategy for renewable systems, as well as a distributed-parameter model of three-phase transmission lines and a constant-parameter voltage-behind-reactance model of generators. Furthermore, several test cases for modern power systems, which feature low-frequency events, ultra-low frequency oscillations, and sub-synchronous oscillations, are constructed and simulated. In addition, the accuracy of the proposed method is further validated through long-duration simulation and large-scale system simulation. Comparative analysis between the shifted frequency and traditional electromagnetic models demonstrates that the proposed models maintain high fidelity under enlarged simulation time steps of more than 100 μ s , as verified by multiple error metrics in both the time and frequency domains. Therefore, the paper provides an effective and efficient solution for the transient simulation of modern power systems with high penetration of renewable energy resources.
Gao et al. (Fri,) studied this question.
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