Study on Transient Characteristics of Power Grid Considering the Effects of High-proportion Wind Generations and SVG
As the proportion of wind generations integrated into power grids gradually increases,the influence of grid con-nection of different penetration ratios of wind generations on the transient power angle stability of synchronous generator units at the sending end is an urgent problem to be solved.A transient stability analysis method for wind farms connected to multigenerator systems is proposed from the perspective of electromagnetic power of synchronous generator sets.The method explores the changes in pre-and post-grid-connection electromagnetic power of the wind turbine to determine the changes in the power angle of the synchronous unit when the system encounters a symmetrical short circuit fault.By intro-ducing wind generation grid connection proportion coefficient k,the influence of k on the transient power angle is studied.Furthermore,considering the reactive power compensation effect of SVG,the influence of the participation of SVG on ini-tial power angle is analyzed using the extended equal area rule(EEAC).Finally the power system simulation software PSS/E is used for simulative verification based on a multi-generator system.It can be concluded that the integration of DFIG units will increase the power angle stability of the system.With the increase of wind generation permeability,the power angle stability of the system will increase first and then decrease.Moreover,the involve of SVG will increase the in-itial power angle of the system,bringing about a positive effect on the transient stability of the system.
DFIGtransient power angle stabilitywind generation proportionextended equal area rule(EEAC)SVG