Calculation of probabilistic load flow considering wind speed correlation and analysis on influence of wind speed correlation

Correlation of wind speed among different find farms affects the calculation results of probabilistic load flows. By means of performing linear transform of independent multidimensional random samples the multi-dimensional random samples with arbitrary correlation are obtained, thus the probabilistic load flow in which the Correlation of wind speed is taken into account can be calculated. In view of the feature of asynchronous wind power generator that it absorbs reactive power, to describe such a feature a variable coefficient quadratic polynomial model is proposed. At the same time that the random disturbance of load is considered, the influencing variation law of wind speed correlation on nodal probabilistic density of nodal voltage and probabilistic distribution of branch load flow as well as the configuration of reactive power compensation capacity at grid-connecting point of wind farms under the consideration of wind speed correlation are researched and analyzed. Simulation results of IEEE 30-bus system to which four wind farms are added show that the proposed method is effective and feasible; considering wind speed correlation the analysis and evaluation of the influences of wind farms on system static voltage and transmission of branch transmission power can be more reasonable, thus it is possible to offer more accurate reference information to system planning and determination of operation modes.