| With the continuous development of the social economy,the increasing awareness of environmental protection and the strengthening of the national goal of"dual carbon",the proportion of wind power generation in China’s power grid is growing.The increase in wind power generation has a more and more prominent influence on the stability of the power system.In this context,starting from the site selection of Changcun wind farm,we study the wind farm access system scheme,analyze the influence of wind farm grid connection on system voltage,and further perform reactive power optimization of the system while providing the theoretical support and practical simulation for regional large-scale wind power connected to the grid safely and reasonably and voltage optimization.The main work of this paper is as follows:(1)According to load forecast of the Yexian power supply area and related power grid development plan,through analyzing the output and load characteristics of the wind farm in the region,the power balance calculation is carried out to dete rmine that Changcun wind farm can be consumed in the Yexian power supply area.(2)Four schemes of connecting wind farms to the power grid are put forward,and the model of the wind farm grid-connection scheme is built on the PSASP simulation platform.The optimal grid-connection scheme is obtained through comparison and analysis of power flow calculation,short-circuit calculation,network loss and cost.(3)Compare and determine the type of reactive power compensation devices,calculate the capacity of static var generator(SVG)required for the wind farm connected to the grid.PSASP simulation platform is used to verify the transient stability of the system when wind speed changes and short-circuit faults occur.(4)A reactive power optimization model based on an improved mayfly algorithm(MA)is established with the objective function of minimizing the active power network loss and voltage deviation.The reactive power optimization model based on the improved MA algorithm is used to optimize the reactive power of the power grid which Changcun wind farm connected to,the required reactive power compensation capacity is calculated,to improve the reliability and economy of the power network. |
