In this work, the input impedance o

In this work, the input impedance of a single power-supplying rectifier acquired from the data center was measured and the impedance-based stability analysis was extended to multi-converter systems, where the analysis was performed based on aggregated impedance-based stability criterion. The analysis revealed decreasing stability margins as more units were connected in parallel, until the stability was lost when the number of paralleled devices was increased to 12 (total power of 30 kW). In addition, system eigenvalue analysis accurately predicted the resonance frequency to the range of 6–8 kHz, which was the resonant frequency in the initial on-site measurements at the data center. To conclude the findings, the instability of the data center along with resonant modes could have been predicted by measuring the input impedance of a single rectifier and applying aggregated impedance-based stability criterion.