Study On Voltage Stability Of Large Grid-connected Wind Power

Wind power is clean, renewable energy, it is the need of adjusting power structureto develop the regenerated energy in a more cost-effective manner rationally, and it isthe important component of the energy development strategy of our country. But windpower to bring clean and renewable energy in the same time, also has not controlled,and the wind farm active power to the electricity transmission system, while alsoabsorbing a lot of reactive power, which makes large-scale wind power operation,voltage stability of the system will have a profound impact.This thesis focuses on a large-scale grid-connected wind power runs on staticvoltage stability of mainly completed work:1.In-depth discussion of existing containing wind farm power flow calculationand compares the advantages and disadvantages of these approaches, this has beendetermined on the basis of wind farms mainly for asynchronous fan power flowmodels.2.In-depth analysis of these models determine wind farm impacts on staticvoltage stability region in injection space.3.Continuity of the trend to use, fast track to the PV curve saddle-nodebifurcation point, and through cluster analysis, the system will be tracked to thecritical point is classified as a number of cluster centers, and thus into a number ofsheets to approximate the tangent plane describe the static voltage stability into thespace domain boundary.4.On this basis, the proposed wind farm into the space containing the domain loadmargin to strike a stable way, and made by fans to contribute to change in differentdirections when the load margin to predict changes in trends. Verified using IEEE57node system show that the method can quickly get under different wind speed staticvoltage stability region boundary, and can predict the system load margin rapidchanges in direction, wind farms can be used with power-line voltage stabilitymonitoring system, with good engineering application prospects.