Modelling of Bidirectional Three-Phase Four-Wire Three-Level NPC MLC under Single-Loop Current Sensorless Control
Energies 2023
Aleksandrs Suzdaļenko, Vsevolod Burenin, Jaroslavs Zarembo, Jānis Zaķis

Single-loop current sensorless control allows for abolishing of the instantaneous current measurement in the control system using only a single control loop with voltage feedback to stabilise the DC-bus voltage. This approach eliminates current sensors in the control circuit, benefiting from saving space on the printed circuit board and minimising power dissipation in the current measurement circuitry. This paper focuses on the single-loop current sensorless control applied to bidirectional three-phase four-wire three-level NPC MLC by simulation analysis and demonstrates the performance of the proposed current control algorithm in the rectifier and inverter modes and the step response with power direction change and grid-voltage change. In capacitor voltage balancing, an additional controller is applied, which is capable of compensating for the voltage asymmetry caused by adding a 2.5 kOhm resistor in parallel to one of the DC-bus capacitors. Our results demonstrate good performance of the proposed control method both in the inverter and rectifier modes, showing stable current shape in the low power and full power modes with acceptable harmonics content, meeting the requirements of the IEC 61000-3-2 standard for Class A devices. The analysis showed that the proposed control approach is suitable for industrial application.


Keywords
AC/DC converter; bidirectional power control; current control; inverter; rectifier; sensorless control
DOI
10.3390/en16124599
Hyperlink
https://www.mdpi.com/1996-1073/16/12/4599

Suzdaļenko, A., Burenin, V., Zarembo, J., Zaķis, J. Modelling of Bidirectional Three-Phase Four-Wire Three-Level NPC MLC under Single-Loop Current Sensorless Control. Energies, 2023, Vol. 16, No. 12, Article number 4599. ISSN 1996-1073. Available from: doi:10.3390/en16124599

Publication language
English (en)
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