Calculation and analysis of capacity credit of wind farms based on Monte-Carlo simulation

How to compare the wind power generation and traditional power generation in aspect of capacity is essential of power system expansion. The capacity credit is a convenient and effective way to compare these two different types of power generation. Unfortunately, the definition of capacity credit of wind farms is not clear and generally acknowledged. In this paper, a more clear definition of wind farms´ capacity credit based on well-known concept of effective load carrying capability (ELCC) is presented. As well as a calculation method of wind farms´ capacity credit based on non-sequential Monte-Carlo simulation, this method considered the failure of transmission lines. The secant method is used at capacity credit calculation process, and the modified direct current optimal power flow method is adopted in power flow calculation. Several different influence factors of capacity credit of wind farms such as the cut-in, cut-out and rated wind speed and the rated capacity of the wind turbine generator, transmission capacity of transmission lines and different integration solutions are analyzed in IEEE-RTS79 case studies.