Hulong Wen

The dynamic modeling of wind farms considering wake effects and its optimal distribution

Under the four-component wind speed model, the wind turbine output power was researched based on the Jensen wake model, which combined of the dynamic wind turbine model; anglicizing with the distribution of wind power from the theoretical, optimization method that named quadratic interpolation was used, and the optimization tool of Matlab\simulink verified that the correct conclusion has a certain rationality. Rational arrangement of wind turbine in order to minimize wake effects, so that the output of wind power can be improved, the study of optimal operation of wind farms and planning issues related to be a certain value.

Bifurcation analysis of voltage stability and study on power loss for wind power system

To reveal the effects of wind power injection to voltage stability and losses of the power system, as well as the role of reactive power compensation, the bifurcation analysis method is used in this paper. Several indexes that characterize the impacts of wind power injection to voltage stability and losses of the power system are proposed for the first time (active power loss per unit^P, reactive power loss per unit77Q, and voltage offset per units AV/P). Research result shows that reactive power compensation can delay or suppress the occurrence of saddle-node bifurcation, but it can not completely make up for negative roles of continually increasing of wind power injection; through quantitative analysis of roles reactive power compensation to reducing of losses and improving of voltage stability, the effectiveness of the proposed indexes were proved. Thus, it is a great breakthrough compared with the qualitative analysis by quantifying the results of the study.

Calculation and study of two-dimensional parameter local bifurcation boundary in wind power system stability model based on continuation method

In order to reveal the mechanism of voltage stability in wind power system and influence to its voltage stability with parameters changing, for limitations of present study about wind power system voltage stability based on bifurcation theory, two-parameter bifurcation analysis were detailed. With the help of ideas that conventional electric power system to calculate the two-dimensional parameter bifurcation boundary, the node voltage two-dimensional saddle-node bifurcation boundary of wind power system was calculated by using inject active power of wind farm, SVC parameters Bmax and Kr as bifurcation control parameters. And on the basis of this in-depth analysis, the laws that parameters affecting the wind power system voltage stability were obtained.