Abstract
The scale of new energy grid-connected power generation continues to expand, the problem of insufficient system inertia and damping becomes increasingly serious. Although the traditional virtual synchronous generator (VSG) control can provide inertia and damping support, the constant virtual inertia and virtual damping cannot meet the dynamic response requirements of frequency and power of the system at different periods. To this end, for the energy storage subsystem of wind storage system based on doubly-fed wind turbine (DFIG), the transfer function is first combined with power angle curve to analyze the effect of virtual inertia and damping on frequency stability and power fluctuation of the VSG control of energy storage subsystem, then, adaptive virtual inertia and damping VSG control is designed and its stability is proved. Considering the coupling problem between the active and reactive power of VSG output, a power decoupling strategy is designed. Thus, a virtual synchronous generator control technique with adaptive inertia and damping, meanwhile, considering power decoupling is proposed. Finally, the reasonable feasibility and technical advantages of proposed improved VSG control are confirmed by system modeling and simulation studies.
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