Power Grid Connection Assessment On The Second Phase Project Of Laoyeling Wind Farm

In recent years, the wind power capacity has accounted for the increasingly high proportion in the grid and China’s "Renewable Energy Law" and relevant supporting regulations were introduced, wind power has already entered a rapid growth period while the impact of the accessed wind farm on the grid is also growing. Because wind power is intermittent and difficult to schedule its features, large-scale wind farms connecting to the grid will have a negative impact on the system safe power quality. As more and more wind farms in operation, technical problems of wind power will become increasingly prominent. In order to ensure the future reliability of large-scale wind farms and network operation, it is necessary to study and assesst the impact of wind farm operation on the grid stability and power quality problems.In this paper, according to actual operating characteristics ofthe Laoyeling wind farm accessing to Xinganmeng grid, analyzed the wind parallel operation of node voltage level and the route of transmission power is analyzed, and reasonable wind farm reactive power allocation scheme is put forward.Then,transient stability of power system with the integration of wind farms is analysed, including the wind farm short-circuit current contribution under power system fault, and transient simulation under different disturbances and faults, interaction between wind farms and power system.Finally, power quality-issues caused by the integration of wind farm is accessed,which includes computing voltage deviation and flicker caused by wind farm, and analyzing the possible harmonics injection caused by the wind farm. Based on investigating the impact of wind farm on the local grid voltage, load flow and power quality,this paper proposes the technical solutions to stabilize the wind farm and power system.