Stability Analysis of Wind Solar Power grid Integration Based on Chaos Analysis

With the development of the Shagehuang New Energy Base, the high-penetration of renewable energy sources and power electronic equipment in the power grid has increased significantly. This shift has a considerable impact on the safe and stable operation of the power grid. In this paper, the equivalent wind power grid-connected model and the equivalent photovoltaic grid-connected model are established respectively, the fourthorder nonlinear differential equations are used to simulate the dynamics behavior of the grid-connected system, The maximum Lyapunov exponent method combined with phase diagrams and voltage time diagrams, is employed to analyze the stability of the grid-connected system both quantitatively and qualitatively. Simulate with IEEE dual-machine three-node system, and the results indicate that when the output power of the photovoltaic power plant exceeds $Q_{1}=11 \mathrm{pu}$ and the output power of the wind farm exceeds $i_{0}=3.42 \mathrm{pu}$, the maximum Lyapunov exponent becomes greater than zero. The system exhibits chaos, causing an increase in the amplitude of voltage oscillations and a decrease in system stability.