Impact of Large-Scale Wind Farm Connecting With Power Grid on Peak Load Regulation Demand

At present large-scale wind farms are being constructed in China at a fast pace and they will be connected with power grids, it makes the peak load regulation of power grid becoming one of new puzzles in the operation of power grid containing wind farms. Considering the random nature of wind power output and complicated and changeable operation modes of wind farm, by means of simulating annual chronological load time series and chronological time series of wind power output in the planned year, the impacts of large-scale wind farm on power system peak load regulation are analyzed in a new viewpoint. The impacting mechanism of wind power output on difference between peak load and valley load of power grid is analyzed, by way of leading in a new evaluation index system the variation of peak-to-valley difference of equivalent load of power grid with large scale wind farm connected and its distribution are researched in detail. The influencing laws of large-scale wind farm on system peak load regulation under various outward power transmission modes and coordinative system peak load regulation modes are further analyzed. Selecting the wind farm base located in Jiuquan, Gansu province as the object, the wind power planning and the dispatching and operation of Gansu power grid are analyzed and demonstrated, and based on the analysis results some suggestions of generation expansion planning and operation mode for Gansu power grid are proposed.