The Influence Research Of Wind Power Integration On Out-Of-Step Oscillation And Splitting Measure Of The Power Grid

With the large interconnected power grid operation, have brought great challenges to the stable operation of the system. The most serious situation of the stability destruction is out-of-step oscillation. To splitting out-of-step section has been the most basic measurement as the third defense line of power system which will effectively eliminate the out-of-step oscillation. With the proportion of wind power and other renewable and clean energy will continue to increase in power system, the characteristics and operation mode of wind power and which are different from conventional power may change the out-of-step oscillation mode and oscillation center distribution.To study the influence of grid connected wind power on the out of step oscillation and the solution of the power grid, based on theoretical research of the impact of wind turbine on the oscillation center. The typical two machine system model is built in the PSD-BPA electromechanical transient simulation software. The effect of the fan types, active power output mode of full or zero output of wind farm and the protection mode that whether the fan have the capacity of high and low voltage ride through on Out-of-step oscillation are studied in two terminals system. Regard the Hexi region of Gansu million kilowatts of wind power base as the research object in actual power grid. Studied the effects of wind power on the out-of-step oscillation and splitting measures in actual power system. Further more, the influence of wind speed fluctuation and reactive power control factor of wind power on out-of-step oscillation bas been extra studied in the Northwest power grid. The result of typical two machine system and the actual power grid show that, the degree of the system oscillation worsen in CCST wind turbine, the influence of the oscillation center distribution is limited. The change of output mode increases the risk of system failure, and has little influence on the distribution of the oscillation center. Does not have the characteristics of high and low voltage ride through wind power easily off-grid after a fault. This exacerbate the degree of oscillation, and will lead to a new center of the oscillation appears. The wind speed fluctuation and the reactive power control of wind power have little influence on the system out of step oscillation in the actual power grid.