Abstract: The lack of active voltage support or insufficient support capacity of new energy on the grid may seriously affect the grid voltage stability. Considering the influence of system parameters and operating conditions of new energy stations and power grids,a quantitative evaluation method of voltage support capability based on gray whitening weight function clustering is proposed. Firstly,a comprehensive new energy voltage support capability evaluation index system is established from the perspective of new energy plants and power grids. Secondly,the comprehensive weights of each evaluation index are obtained based on the combination weighting method. Then,an improved sinusoidal whitening weight function is proposed,the active support ability of new energy voltage is quantitatively evaluated. Finally,the real operation data of 10 wind farm stations in a province are analyzed,and the results show that the proposed method can accurately evaluate the voltage support capability.