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RISS 인기검색어
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- 저자 : Zhong Zaimin (검색결과 5 건)
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Zhong Zaimin,Shao Zhongshu,Bao Yong 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.6
The real-time simulation platform of constant d–q axis inductance parameter permanent magnet synchronous motor model only considers the fundamental wave of magnetic fi eld and it cannot accurately describe the spatial harmonic characteristics of the motor. Thus, this platform is not applicable in the developing and testing of control algorithms suppressing torque ripple and harmonic current. Aiming at this problem, a hardware-in-the-loop platform is built using an analytical motor model called “distributed parameter model” based on magnetic co-energy reconstruction. This model describes the variation of magnetic co-energy, fl ux linkage, voltage and torque with reference to rotor spatial position. So, it can accurately refl ect the nonlinear characteristics including saturation, slotting eff ects and non-sinusoidal back-EMF. The model is numerically discretized and compiled by Verilog hardware language in FPGA, then tested with closed-loop FOC control algorithm. The real-time simulation can verify the control algorithm with real controller and the simulation step of the motor model is 1 μs. Compared with the bench test results of the actual motor, the spatial harmonic characteristics of the motor in the real-time simulation platform are verifi ed.
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Multiple reference frame-based current harmonic control for interior PMSMs considering motional EMF
Zhong, Zaimin,Zhou, Shuihua,Shao, Zhongshu The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.6
For permanent magnet synchronous machines (PMSMs), current harmonics need to be controlled under two kinds of conditions. Under the first condition, the current harmonics caused by the non-sinusoidal back-electromotive force (EMF) and the dead time of inverters should be suppressed. Under the second condition, specific current harmonics should be injected to suppress the torque ripple of motors. Therefore, the accurate control of current harmonics is critical. It has been found that the original multiple reference frame (MRF)-based control algorithm cannot effectively achieve the control of current harmonics at high speeds. For the currents in MRFs, motional EMF was dominant rather than induced EMF at higher speeds. As a result, the original MRF-based control algorithm does not work at high speeds. To solve this problem, this paper proposed a novel MRF-based control algorithm that considers motional EMF. Furthermore, this paper achieved decoupling control of the current harmonics in MRFs for interior PMSMs. With the proposed control algorithm, the current harmonics of interior PMSMs can be controlled at both high and low speeds. Under the influence of non-sinusoidal back EMF and the dead time of the inverter, the effect of current harmonic control was verified on a laboratory test bench.
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Zhong, Zaimin,Shao, Zhongshu,Zhou, Shuihua The Korean Institute of Power Electronics 2021 JOURNAL OF POWER ELECTRONICS Vol.21 No.10
Pulsating high-frequency voltage injection is an effective method for estimating the initial rotor position for interior permanent magnet synchronous motors (IPMSMs). This method is based on the magnetic saliency of a motor rather than a back-electromotive-force (back-EMF) model. In addition, it is feasible when the motor is static or in low-speed operations. However, accurate estimation of the rotor position is realized on the assumption that the direct-axis and quadrature-axis of the motor are completely decoupled, which is not always satisfied. Then, the mutual inductance between the two axes introduces a theoretical error into the rotor position estimation. In this paper, the theoretical error of the rotor position estimation caused by mutual inductance is deduced. An improved initial rotor position estimation method is proposed to eliminate harmonic theoretical errors by injecting high-frequency voltage in the decoupling coordinate system. Finally, the effectiveness of this method is verified by experimental results.
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Current harmonic selection for torque ripple suppression based on analytical torque model of PMSMs
Zhong, Zaimin,Zhou, Shuihua,Hu, Chengyu,You, Junming The Korean Institute of Power Electronics 2020 JOURNAL OF POWER ELECTRONICS Vol.20 No.4
For permanent magnet synchronous motors (PMSMs) without sufficient design optimization, it is necessary to inject current harmonics to suppress torque ripple. Due to the influence of magnetic saturation, the current harmonics for torque ripple suppression changes with the electrical loads. Based on an existing analytical torque model of a PMSM considering spatial harmonics and magnetic saturation, this paper established a torque harmonic coupling model through a Taylor expansion and a harmonic balance method. Then, based on the torque harmonic coupling model, current harmonic selection for torque ripple minimization was proposed. The validity of the torque harmonic coupling model and current harmonic selection was verified by a finite element analysis (FEA) and experiments on a laboratory PMSM drive system.
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Coupling Harmonic Voltages Considered Harmonic Currents Injection Method for Torque Ripple Reduction
Jiang Shang,Zhong Zaimin 대한전기학회 2021 Journal of Electrical Engineering & Technology Vol.16 No.4
Torque ripple widely exists in vehicular permanent magnet synchronous motors, which degrades the quality of output torque and even causes undesirable vibration in the vehicular application. In this paper, we propose a torque ripple reduction method based on harmonic currents injection. Firstly, with considering a couple of positive and negative sequence harmonic current simultaneously, a harmonic voltages model of PMSM in multiple synchronous-frames is established. The model reveals that either positive or negative voltage alone can induce positive and negative currents in the meantime. Secondly, based on the coupling harmonic voltages model, a novel harmonic currents injection system is established by combining feedforward harmonic voltages and feedback harmonic currents control. Finally, simulations and experiments are conducted to validate our proposed control system. The results show that the feedforward harmonic voltages can remedy the limitation of feedback control on dynamic tracking performance of harmonic currents, and then improve the torque ripple reduction eff ect during the dynamic process
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