Single-Loop Current Sensorless Control with Self-Detection of Conduction Losses Applied to Neutral Point Clamped Multilevel Converter

2019 11th International Conference on Electrical and Electronics Engineering (ELECO 2019) 2019
Aleksandrs Suzdaļenko, Jānis Zaķis, Oskars Krievs

Current sensor is usually considered a compulsory part in current controlled power electronic converters. This paper presents a single-loop current sensorless control method for neutral point clamped multilevel converter. In order to control the current shape, the proposed method does not use feedback from current sensor and contains only a single control loop with voltage feedback to stabilize the DC bus voltage. The current control is implemented by means of precise calculation of volt-second balance of the inductor with consideration of conduction losses. Considering that values of parasitic components may change during converter’s operation, a novel mathematical observer is presented to implement continuous monitoring of parasitic elements introduced by switching components and resistance of the inductor. Moreover estimation of inductance is proposed with a simple method.

Keywords
sensorless control; current control; pulse width modulation inverters, multilevel converter
DOI
10.23919/ELECO47770.2019.8990464
Hyperlink
https://ieeexplore.ieee.org/document/8990464

Suzdaļenko, A., Zaķis, J., Krievs, O. Single-Loop Current Sensorless Control with Self-Detection of Conduction Losses Applied to Neutral Point Clamped Multilevel Converter. In: 2019 11th International Conference on Electrical and Electronics Engineering (ELECO 2019), Turkey, Bursa, 28-30 November, 2019. Piscataway: IEEE, 2019, pp.250-254. ISBN 978-1-7281-2394-3. e-ISBN 978-605-01-1275-7. Available from: doi:10.23919/ELECO47770.2019.8990464

Publication language
English (en)