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- 저자 : Quanfeng Li (검색결과 3 건)
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Shichang Liu,Quanfeng Li,Xuanyu Hong,Yahui Zuo,Dingjiang Zou 전력전자학회 2023 JOURNAL OF POWER ELECTRONICS Vol.23 No.2
To effectively suppress the electromagnetic vibration generated by a permanent magnet motor at different frequency bands and to further improve the comprehensive control performance of the system, a new vector control strategy is proposed in this paper. The speed controller and current controller of the traditional vector control system of a permanent magnet synchronous motor (PMSM) are improved by means of an active disturbance rejection controller (ADRC) and a super-twisting sliding mode controller (STSMC). At the same time, random frequency space pulse width modulation (RFSVPWM) based on a periodic function is proposed to replace the traditional SVPWM. First, the expression of the radial electromagnetic force wave generated by motor supply current harmonics in low and medium frequency as well as high-frequency sideband is deduced by an analytical method, and the reason for the generation of the new radial electromagnetic force based on PI vector control is determined. Second, the ADRC, STSMC, and RFSVPWM are designed to suppress the power supply current harmonics and radial electromagnetic force components that greatly contribute to the electromagnetic vibration of the motor in different frequency bands. Finally, the superiority of the improved PMSM vector control system in terms of the comprehensive control performance and electromagnetic vibration is verified by multi-physics coupled finite element simulations.
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Xinjian Cai,Zhenxing Wu,Quanfeng Li,Shuxiu Wang 전력전자학회 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
Cascaded H-bridge multilevel (CHBML) inverters usually include a large number of isolated dc-voltage sources. Some faults in the dc-voltage sources result in unequal cell dc voltages. Unfortunately, the conventional phase-shifted carrier (PSC) PWM method that is widely used for CHBML inverters cannot eliminate low frequency sideband harmonics when the cell dc voltages are not equal. This paper analyzes the principle of sideband harmonic elimination, and proposes an improved PSCPWM that can eliminate low frequency sideband harmonics under the condition of unequal dc voltages. In order to calculate the carrier phases, it is necessary to solve transcendental equations for low frequency sideband harmonic elimination. Therefore, an approach based on the artificial bee colony (ABC) algorithm is presented in this paper. The proposed PSCPWM method enhances the reliability of CHBML inverters. The proposed PSCPWM is not limited to CHBML inverters. It can also be applied to other types of multilevel inverters. Simulation and experimental result obtained from a prototype CHBML inverter verify the theoretical analysis and the achievements made in this paper.
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Cai, Xinjian,Wu, Zhenxing,Li, Quanfeng,Wang, Shuxiu The Korean Institute of Power Electronics 2016 JOURNAL OF POWER ELECTRONICS Vol.16 No.2
Cascaded H-bridge multilevel (CHBML) inverters usually include a large number of isolated dc-voltage sources. Some faults in the dc-voltage sources result in unequal cell dc voltages. Unfortunately, the conventional phase-shifted carrier (PSC) PWM method that is widely used for CHBML inverters cannot eliminate low frequency sideband harmonics when the cell dc voltages are not equal. This paper analyzes the principle of sideband harmonic elimination, and proposes an improved PSCPWM that can eliminate low frequency sideband harmonics under the condition of unequal dc voltages. In order to calculate the carrier phases, it is necessary to solve transcendental equations for low frequency sideband harmonic elimination. Therefore, an approach based on the artificial bee colony (ABC) algorithm is presented in this paper. The proposed PSCPWM method enhances the reliability of CHBML inverters. The proposed PSCPWM is not limited to CHBML inverters. It can also be applied to other types of multilevel inverters. Simulation and experimental result obtained from a prototype CHBML inverter verify the theoretical analysis and the achievements made in this paper.
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