基于共振扩张状态观测器的内置式永磁同步电机统一全速域无位置传感器控制

doi:10.19595/j.cnki.1000-6753.tces.230597

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Abstract

Conventional sensorless control of permanent magnet synchronous motors in the full speed domain achieves rotor position estimation by combining the two position estimation methods. However, in frequent wide frequency domain speed regulation conditions, the two position estimation methods switch frequently, which can easily cause oscillations in the estimated position and speed. Moreover, the two position estimation methods require separate design and tuning, increasing the difficulty of system tuning and algorithm complexity. For this reason, this paper proposes a unified full speed sensorless control method of interior permanent magnet synchronous motor based on resonance extended state observer.
First, the fundamental frequency back electromotive force and high-frequency back electromotive force are estimated by the resonant extended state observer. The resonant extended state observer adds a high-frequency disturbance estimation loop on the basis of the traditional extended state observer to estimate the high-frequency back electromotive force in low speed zone generated by injecting high-frequency voltage, and the fundamental frequency back electromotive force is estimated by the original disturbance estimation loop of extended state observer. The original disturbance estimation loop of extended state observer has the characteristics of a notch filter at the frequency of injected high-frequency voltage. In addition, it has a good ability to suppress the high-frequency measurement noise, so it can accurately estimate the fundamental frequency back electromotive force. The high-frequency disturbance estimation loop of the resonant extended state observer has the characteristics of a band-pass filter, and there is no amplitude attenuation and phase lag at the frequency of injected high-frequency voltage, so it can accurately estimate the high-frequency back electromotive force.
Then, a unified model in the full speed domain is established, and the rotor position and speed estimation in the full speed domain are realized through the unified model. At zero speed and low speed, the signal-to-noise ratio of the fundamental frequency back electromotive force is low, so the rotor position cannot be accurately estimated by the fundamental frequency back electromotive force. By injecting high-frequency voltage into the d-axis, the signal-to-noise ratio of the high-frequency back electromotive force is increased. However, the high-frequency back electromotive force is modulated by the injected high-frequency signal, and cannot be directly used to estimate the rotor position. In order to achieve high signal-to-noise ratio of rotor position information in the full speed domain, a unified full speed domain model is constructed. The amplitude of the unified full speed domain model is the sum of the square of the fundamental frequency back electromotive force amplitude and the square of the high-frequency back electromotive force amplitude, and the unified full speed domain model includes the rotor position information, so it can ensure the signal-to-noise ratio of the rotor position information in the full speed domain. The output of the unified full speed domain model is used as the input of the phase-locked loop, and the output of the phase-locked loop is the estimated rotor position and speed.
Finally, the correctness and effectiveness of the proposed method were verified on the 2.0 kW interior permanent magnet synchronous motor experimental platform. Compared with traditional composite control full speed domain interior permanent magnet synchronous motors sensorless control method, the proposed method has the following advantages: 1) The full speed domain uses the same estimator without a transition zone, simplifying the control algorithm and reducing tuning difficulty, while avoiding speed and position oscillations caused by frequent switching of the two observers in the traditional composite control full speed domain sensorless control method. 2) Estimation errors caused by filters and delays in traditional high-frequency injection methods is eliminated.

Key words： Permanent magnet synchronous motor sensorless control resonance extended state observer unified full speed domain model

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TM351

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	Zhang Yanping
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	Su Ming
	Liu Jing

Cite this article:

Zhang Yanping,Yin Zhonggang,Su Ming等. Unified Full Speed Sensorless Control of Interior Permanent Magnet Synchronous Motor Based on Resonance Extended State Observer[J]. Transactions of China Electrotechnical Society, 0, (): 239624-239624.

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https://dgjsxb.ces-transaction.com/EN/10.19595/j.cnki.1000-6753.tces.230597 OR https://dgjsxb.ces-transaction.com/EN/Y0/V/I/239624

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