Abstract
High-frequency signal injection (HFSI) method is widely used in machine sensorless control in low speed operation range. The conventional HFSI methods are to superimpose high-frequency voltage signals onto the commanded stator voltage vector. Thus, the magnitude of the voltage used for machine torque production is sacrificed and these methods are not applicable for high-speed operation range. In this paper, a new HFSI method, in which high-frequency signal is generated by shifting the duty cycles between two neighboring switching periods, is proposed. This method allows injecting a high-frequency signal at half of the switching frequency without the necessity to sacrifice the machine fundamental voltage amplitude. This may be utilized to develop a new position estimation algorithm without involving the machine inductance in the medium- to high-speed range. As an application example, a new position estimation algorithm using the proposed HFSI method is developed and applied to a synchronous reluctance machine drive system. The proposed algorithm focuses on the medium- to high-speed range with the advantage of no filter needed for position information extraction and a machine-inductance-independent sensorless control implementation scheme is achieved. Experimental results are given to support the proposed new approaches.
Original language | English |
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Article number | 7891043 |
Journal | IEEE Journal of Emerging and Selected Topics in Power Electronics |
Volume | 5 |
Issue number | 3 |
Pages (from-to) | 1225-1236 |
Number of pages | 12 |
ISSN | 2168-6777 |
DOIs | |
Publication status | Published - Sept 2017 |
Keywords
- Duty cycle shifting
- High-frequency signal injection (HFSI)
- Parameter independent
- Sensorless control
- Voltage magnitude loss