Abstract
Due to the unbalanced three-phase currents and the torque ripples and speed fluctuations to the drive caused by the current sampling errors of three-phase current sensors and corresponding signal processing circuits, the estimation on current sampling errors is of great importance to eliminate these adverse effects. The observer-based methods, however, present two defects: first, they could increase the computational burden to the drives, thus limiting their practical applications; second, their high dependence on the system speed or position feedback information might degrade the estimation accuracy. To solve these problems, this article proposed a fixed-point sampling method of lower branch flows and three phase-currents, which adopts the relations between the measured currents, rather than any complex algorithm, to estimate the current sampling errors. To coordinate with the proposed strategy, a fixed-point sampling scheme was accordingly rolled out. Compared with the observer-based methods, as a fixed-point one, much applicable to actual digital controllers, it could reduce the computational burden of the drive. Meanwhile, its effectiveness was verified by experimental results on a 1.5-kW IPMSM prototype, which showed accurate estimated current sampling errors and the effectively eliminated torque ripples and speed fluctuations.
Original language | English |
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Pages (from-to) | 5748 - 5759 |
Number of pages | 12 |
Journal | IEEE transactions on power electronics |
Volume | 36 |
Issue number | 5 |
Early online date | 15 Oct 2020 |
DOIs | |
Publication status | Published - May 2021 |
Bibliographical note
Funding Agency:10.13039/501100001809-National Natural Science Foundation of China; 10.13039/501100012226-Fundamental Research Funds for the Central Universities;