Large-scale wind power integrated into a weak grid is a typical feature for many wind pool areas in China

hence the voltage fluctuation and wind turbine generators (WTGs) cascading trip-off challenge to operation. An autonomous-synergic voltage control architecture is proposed. On the wind farms side

the autonomous controller coordinates static var compensators (SVCs)

static var generators (SVGs)

WTGs and capacitors to suppress voltage fluctuations. On the control center side

an agile flexible secondary voltage controller capable of adjusting its control period adaptively according to the wind power variation is proposed to retain a better voltage profile. Moreover

a security-constrained optimal power flow (SCOPF) based preventive control will be carried out should the cascading trip risk get too high. Some of the key technologies of this architecture have been implemented in several wind bases and wind farms in China

the effectiveness exhibited by real-life operation experience.