Coordinate Control of Grid Power, Battery SoC and LVRT Protection in Single VSC Tied DFIG
DOI:
https://doi.org/10.13052/dgaej2156-3306.37310Keywords:
Sensor less rotor position computation (SLRPC), state of charge (SoC), voltage source converter (VSC).Abstract
This paper proposes a coordinate control scheme for the single VSC tied
doubly-fed induction generator (DFIG). In this control scheme, both the grid
power and battery SoC (State of Charge) are maintained to provide an un-
interrupted power supply. During the continuous operation of DFIG in the
sub synchronous region, there is scope for complete battery discharge. Hence
to overcome this drawback, the coordinated control scheme maintains the
battery SoC level within the limits. If the SoC falls below the specified lower
limit, then the proposed scheme curtails the grid power. Instead of discharging
the battery, the control shifts the battery to charging mode until the safe
limit of SoC is attained. During the continuous operation of DFIG in the
super synchronous region, if the SoC reaches its upper limit, the proposed
scheme discharges the extra power to the dump load. Further, this control
scheme also introduces the low voltage ride through (LVRT) aspect according
to IEGC (Indian electricity grid code) of 15% of nominal voltage and also an enhanced rotor position computation is implemented for the effective
estimation of rotor position for single VSC tied DFIG. This control makes
the topology more robust and improves the reliability of the system. The
proposed scheme is validated for a test system of 3.7 kW Wound Rotor
Induction Machine based DG unit and investigations are done in MATLAB
simulation.
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