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Online_Adaptation_of_Two-Parameter_Inverter_Model_in_Sensorless_Motor_Drives.pdf (10.79 MB)
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Online Adaptation of Two-Parameter Inverter Model in Sensorless Motor Drives

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posted on 11.01.2022, 15:03 authored by Jiahao ChenJiahao Chen, Jie Mei, Xin Yuan, Yuefei Zuo, Jingwei Zhu, Christopher H. T. Lee
This paper designs parameter adaptation algorithms for online simultaneous identification of a two-parameter sigmoid inverter model for compensating inverter nonlinearity to reduce the voltage error in flux estimation for a position sensorless motor drive. The inverter model has two parameters, a2 and a3, where a2 is “plateau voltage”, and a3 is a shape parameter that mainly accounts for the stray capacitor effect. Parameter a3 is identified by the (6k ± 1)-th order harmonics in measured current. Parameter a2 is identified by the amplitude mismatch of the estimated active flux. It is found that the classic linear flux estimator, i.e., the hybrid of voltage model and current model, cannot be used for a2 identification. This paper proposes to use a saturation function based nonlinear flux estimator to build an effective indicator for a2 error. The coupled identifiability of the two parameters is revealed and analyzed, which was not seen in literature. The concept of the low current region where the two-way coupling between a2 and a3 occurs is established. In theory, it is suggested to stop the inverter identification in the low current region. However, the experimental results in which dc bus voltage variation and load change are imposed, have shown the effectiveness of the proposed online inverter identification and compensation method, even in low current region.

Funding

NRF-NRFF12-2020-0003

History

Email Address of Submitting Author

horychen@qq.com

ORCID of Submitting Author

0000-0002-8927-5646

Submitting Author's Institution

Nanyang Technological University

Submitting Author's Country

Singapore