Penetration Capacity Calculation for Wind Farms Considering Random Output

Abstract

The majority of the distribution network is supplied by unilateral power and has a radial distribution, wind farms connected into grid will inevitably bring a certain extent on static voltage of the distributed grid. Furthermore, the randomness of wind farm output will cause the node voltage fluctuations. This paper firstly studies the random flow calculation method including wind power, and analyzes the probability distribution of the grid voltage when wind farms with different capacity accessing by combining the Newton-Raphson method with probability theory. Then establishes a computing model of penetration capacity of wind farms with the constrain of the static voltage stability range. For different values of confidence level α, the results of penetration capacity are different, then we can choose the value α flexibility according to the distribution network security requirements.