Analysis of Large-Disturbance Stability off Full DC Power Generation System Based on Lyapunov

With the wind farms rapid growth, large-scale wind energy pooling and transmission methods are receiving more and more attention. To solve the problem of reactive power, negative sequence, and phase-locked stability caused by the grid-connected process of traditional wind farms, DC conversion technology and DC wind turbines are used to form full DC type wind farms. Due to the characteristics of high proportion of power electronics in full DC type wind farms, there is an urgent need to study the stability problems of full DC power generation system, especially the system large disturbance stability problems. In order to address the large disturbance stability problem of the full DC power generation system, the TS fuzzy model is used to estimate the stability region of the system for the large disturbance stability analysis of the wind power DC system, and the Lyapunov function is constructed with the help of Lyapunov second method to analyze the relationship between the system electrical and control extent on the large disturbance the stability region of the system according to the linear matrix inequality (LMI) tool. The relationship between the electrical and control parameters of the system on large disturbance stability domain of attraction(DOA). The research results can help guide the adjustment of system extent and improve the anti-interference capability of the system.