On the IEEE European LV test feeder, the line-voltage-based LVUR tracks the true VUF closely, the phase-voltage-based PVUR1 and PVUR2 deviate strongly, and PV integration changes both unbalance and metric accuracy depending on placement.
Some observations on definitions of voltage unbalance,
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Evaluation of Voltage Unbalance Metrics in Distribution Networks with High DER Penetration
On the IEEE European LV test feeder, the line-voltage-based LVUR tracks the true VUF closely, the phase-voltage-based PVUR1 and PVUR2 deviate strongly, and PV integration changes both unbalance and metric accuracy depending on placement.