Transient Stability Analysis for Grid-Connected Renewable Power Generation Systems Based on LMI Optimization Modelling

Grid-connected renewable power generation systems (RPGSs) may be disconnected from the grid under a transient process, which may possibly induce large-scale power outage accidents. Optimization of parameters based on transient stability analysis of RPGSs would be a feasible solution to such a problem. However, the accurate stability boundary of a grid-connected RPGS are hard to obtain, as the commonly used transient stability analysis methods have the problems of large computation burden with no quantitative solution (numerical method), low analysis accuracy (equal area method), and complexity or impossibility in implementation (Lyapunov function-based methods). In this paper, a modified transient stability analysis method is proposed. By calculating the largest area of the domain of attraction (LEDA) based on the linear matrix inequality (LMI) method and optimization modelling, and then applying parameter sensitivity analysis to the LEDA, the dominant parameters that have high impacts on the LEDA are revealed. A parameter optimization design method that can improve the system’s transient stability is eventually obtained. A hardware-in-the-loop (HIL) simulation system of a 2 MW grid-connected RPGS is established based on the Typhoon HIL 602 device. The theoretical results are verified by using HIL simulation results.