Analysis on reliability indices of wind farm and its influencing factors

With the capacity of single wind turbine and the size of wind farm increasing, the generation reliability issues of wind farms become increasingly prominent. Compared with conventional power supply, wind power has strong stochastic volatility. Then the reliability evaluation indices for conventional supply don´t apply to wind power. So it is more and more important to research and development the evaluation indices for the reliability of wind power. For wind power generation system, reliability studies focuses primarily on how much wind turbines can provide to power to meet load requirements, so it is part of power generation system reliability study. This paper proposes four indices, which are wind farm capacity validity coefficient (CVC), wind farm generation intensity coefficient (GIC), wind farm operation security coefficient (OSC), wind farm relative benefit coefficient (RBC). They evaluate the reliability of wind power generation from point of abundance, continuity, security and economic. Addition, these indices do not stand alone and are interrelated and complemented each other. As a system, they are integrated reflection of the overall wind farm situation. More importantly, to demonstrate the four indicators as an evaluation system is feasible, the paper has done a lot of figures, which response how indices change when the types of wind turbine and wind speed distribution change separately. These analysis results can be used as a basis for assessment of wind farms. At the same time they have an important reference value for the study of the economy and the true value of wind power and provide some help to wind farm design. Also, these results run a certain guide for wind farm planning, for the government in formulating relevant policies and for the power companies to determine the internet price.