Seamless Transfer Strategy of a Wind-Battery Microgrid Between Grid Connected and Islanded Mode of Operation

Abstract

The need to reduce the carbon footprint has paved the way for harnessing electricity generation from the renewable energy resource i.e. wind. However, its intermittency leads to a wide gap between supply and demand of the user. The battery energy storage in conjunction with the wind generation system controls the energy flow and curb the variability issues hampering the power quality of the grid. Here, in this work, wind power based microgrid is interfaced to a 3-phase AC distribution network with seamless transfer between the grid to standalone/standalone to the grid operating mode. In the case of the grid failure, the control seamlessly transits from the current control to the voltage control. The grid connected mode and standalone mode of operation are enabled according to the signal provided to the static transfer switches (STS). The power quality (PQ) improvement along with energy surety and sufficiency are perceived by managing the local load support. The self-correcting sign-sign (SCSS) adaptive filter is used to control the microgrid in the grid connected mode of operation, while the enhanced proportional resonant (EPR) controller with binary generalized integrator based phase locked loop (BGI-PLL) is utilized in the voltage control mode. The improved encoderless scheme adopted to estimate the speed and rotor position of the wind generator, reduces the cost of the mechanical sensors. The co-operational behavior of the microgrid is obtained.