Abstract:In order to fundamentally solve the problem of "stuck neck" in core chip of secondary equipment in power grid and fully support the business needs of "unattended and centralized monitoring" of substations, a new generation substation with autonomous and controllable technology adopts the principles of "autonomous and controllable, safe and reliable, advanced and applicable, intensive and efficient", and is designed and controlled independently in terms of equipment hardware and software. In order to have a better construction to new generation substations with autonomous and controllable technology, it focuses on the analysis of joint control strategy of secondary system. Firstly, the basic technologies needed by joint control are analyzed. The overall framework of joint control for auxiliary equipment of new generation substations with autonomous and controllable technology is introduced, and its overall functions are analyzed. And then by sorting out the types of auxiliary equipment joint control, the joint control strategies are divided into main and auxiliary linkage, inter subsystem linkage and intrasubsystem linkage, and the joint control is described with specific cases. Finally, the joint control strategies of auxiliary equipment in substations are summarized and prospected.