TITLE:
The Novel Current Control for Virtual Synchronous Generator
AUTHORS:
Atsushi Umemura, Rion Takahashi, Junji Tamura
KEYWORDS:
Wind Energy Generation, State Feedback, Electric Current Control, Linearization Techniques, Discrete Time Model Following Control, Virtual Synchronous Generator
JOURNAL NAME:
Journal of Power and Energy Engineering,
Vol.8 No.2,
February
28,
2020
ABSTRACT: In recent years, power generation using renewable
energy sources has been developed as a solution to the global warming problem.
Among these power generation methods, wind power generation is increasing. However,
as the penetration level of wind power generation increases, the low inertia
and lack of synchronous power characteristics of the penetrated power system
can have a significant impact on the transient stability of the grid. The
virtual synchronous generator provides the ability of virtual inertia and
synchronous power to interconnected inverters. The interconnected inverter with
the virtual synchronous generator ability uses, in general, PI control based current
controller. This paper proposes a new current-control method and compares it
with conventional methods. The proposed current control is a method that
follows virtual synchronous generator model that changes every moment by
solving the discrete-time linear quadratic optimal control problem for each
sampling time interval. The new method follows the conventional method, and therefore
the reactive power fluctuation can be suppressed and the interconnected
inverter will be downsized.