Aggregate Modelling of 2-150 kHz Emission in Multi-Converter Systems (with synchronized and unsynchronized switching)

Naser Nourani Esfetanaj, Jan Meyer, Huai Wang, Frede Blaabjerg, Pooya Davari

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Voltage source inverter (VSI) has become the most popular circuit topology employed for integrating PVs to the power grid. Considering the high penetration of the inverter into the power grid, there is a lack of systematic understanding, how the noise within 2-150 kHz of multiple sources superimpose and propagate through the power grid. This paper suggests a new aggregated model based on analytical equivalent circuit to emulate multiple parallel grid-connected inverters behavior. The proposed analytical method characterizes the inverter's generated noise within 2 - 150 kHz using the double Fourier analysis and closed-loop admittance. Utilizing the developed models, the interactions among different inverters and their impact on disturbance levels in the frequency range 2-150 kHz are investigated, which is one of the main gaps in this field. The parallel operation of several similar inverter units with synchronized and unsynchronized switching frequencies is analyzed. In case of unsynchronized operation, the beating effect at switching frequency is studied. A case study including ten units, 3-kW VSI, is presented to validate the theoretical analysis as well as showing the role of beating effects between the multi- inverter on the disturbance levels
TitelIEEE Open Journal of Power Electronics
StatusAfsendt - 1 jun. 2021


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