Wind Power and Wave Power Generation Systems with DC Microgrid

Abstract

In order to study the uncertainty and intermittent
characteristics of wind power and wave power, this paper proposes
an integrated wind and wave power generation system fed to an ac
power grid or connected with an isolated load using a dc microgrid.
The proposed dc microgrid connects with a wind power generator
through a voltage-source converter (VSC), a wave power
generator through a VSC, an energy storage battery through a
bidirectional dc/dc converter, a resistive dc load through a load
dc/dc converter, and an ac power grid through a bidirectional
grid-tied inverter. The studied integrated wind and wave system
joined with the dc microgrid is modeled and simulated using the
written program based on MATLAB/Simulink. Root-loci plots of
the studied system under various speeds of the wave generator are
analyzed. To examine the fundamental operating characteristics of
the studied integrated system joined with the dc microgrid, a laboratory-
scale platform is also established. Comparative simulation
and experimental results reveal that the studied integrated system
can maintain stable operation to supply power under different
operating conditions using the proposed dc microgrid.