高惯量储能型同步调相机与直驱风电场交互作用诱发次同步振荡机理分析OA

As a new type of power electronic equipment,the high-inertia energy storage synchronous condenser(HIESSC)has significant inertia/frequency support capabilities.However,the dynamic characteristics of HIESSC are complex,and there is an intricate sub-synchronous oscillation(SSO)interaction with the direct-drive permanent magnet synchronous generator(D-PMSG)when it is connected to the power grid,which profoundly affects the small interference stability of the grid-connected D-PMSG system.To reveal the interaction mechanism between HIESSC and the D-PMSG grid-connected system and its influence on the SSO of the system,this paper takes the grid-connected D-PMSG system with HIESSC as the research object,and firstly establishes the closed-loop transfer function block diagram of the system according to the system's small signal model.Subsequently,the coupling path of the SSO of the D-PMSG unit through HIESSC was deduced by using the damping torque analysis,and the damping coefficients under different coupling paths were obtained.The influence of D-PMSG phase-locked loop parameters,HIESSC phase-locked loop parameters.HIESSC rotor speed on the stability of the sub-synchronous oscillation of the system was further studied,and the design principles of HIESSC parameters are given.Finally,the correctness of the damping characteristic analysis was verified based on the time-domain simulation.