In recent years, power generation using renewable energy sources has been\ndeveloped as a solution to the global warming problem. Among these power\ngeneration methods, wind power generation is increasing. However, as the\npenetration level of wind power generation increases, the low inertia and lack\nof synchronous power characteristics of the penetrated power system can\nhave a significant impact on the transient stability of the grid. The virtual\nsynchronous generator provides the ability of virtual inertia and synchronous\npower to interconnected inverters. The interconnected inverter with the virtual\nsynchronous generator ability uses, in general, PI control based current\ncontroller. This paper proposes a new current-control method and compares\nit with conventional methods. The proposed current control is a method that\nfollows virtual synchronous generator model that changes every moment by\nsolving the discrete-time linear quadratic optimal control problem for each\nsampling time interval. The new method follows the conventional method,\nand therefore the reactive power fluctuation can be suppressed and the interconnected\ninverter will be downsized.
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