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A control scheme for voltage unbalance compensation in an islanded microgrid
Ist Teil von
Electric power systems research, 2019-12, Vol.177, p.106016, Article 106016
Ort / Verlag
Amsterdam: Elsevier B.V
Erscheinungsjahr
2019
Link zum Volltext
Quelle
Alma/SFX Local Collection
Beschreibungen/Notizen
•Voltage mitigation strategy for photovoltaic inverter in islanded microgrid.•No need to unbalanced load current sensors for calculating compensating current.•Getting rid of current sensors reduce the cost and complexity of system.
One of the major power quality issues in low-voltage (LV) microgrids is the voltage unbalance which has adverse effects on electrical devices. This paper presents a novel control scheme to mitigate the voltage unbalance by a photovoltaic (PV) system. In this study, load current sensors are eliminated and the PV system mitigates the voltage unbalance by analyzing its terminal voltage. This could effectively reduce the cost and complexity of compensation system because of the difficulties of load current sensors. The proposed control strategy is developed for a three-phase PV. As the inverter detects the voltage unbalance at its terminal, the proposed control algorithm calculates the compensation reference currents based on the double synchronous reference frame (DSRF) analysis of the PV terminal voltage. Therefore, the PV inverter injects the compensating currents to the microgrid. The effectiveness of the control scheme is verified by simulation studies in the PSCAD/EMTDC environment.