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RISS 인기검색어
- 검색키워드
- 저자 : Chaohui Zhao (검색결과 4 건)
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Research on Tangential Magnetization Parallel Magnetic Path Hybrid Excitation Synchronous Machine
Pang Liang,Zhao ChaoHui,Shen HeBiao 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.5
A hybrid excitation motor with strong magnetizing ability is proposed. To solve the existing hybrid excitation machine problems, such as the diffi culty of total adjustment of air gap magnetic fi eld, many additional magnetic paths, fault tolerance is poor, and Air gap fl ux density harmonic distortion rate is high. According to the structural characteristics and the principle of magnetic regulation of tangential magnetization parallel magnetic path hybrid excitation synchronous machine. The equivalent magnetic path model of the motor was established, and the infl uence of electric excitation magnetic potential on permanent magnetic potential and air gap magnetic fi eld was analyzed. With the ANSYS Maxwell fi nite element simulation software, the variation law of the magnetic fi eld of the motor under diff erent excitation conditions is studied. The infl uence of pole boot length and magnetic pole eccentricity on air gap fl ux density amplitude and harmonic distortion rate is discussed. The results show that due to the characteristics of the parallel magnetic path. The motor has obvious eff ect of adjusting magnetic fi eld and gathering magnetic fi eld, motor fault tolerance is excellent, and less additional magnetic path. In addition, the air gap density can be optimized by using reasonable pole boot length and magnetic pole eccentricity.
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Design of Single-Phase Electrical Spring Based on PR Controller and Critical Load Current Feedback
Wei Yi,Zhao ChaoHui,Duan YuBin 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.6
According to the characteristics of fast and accurate voltage regulation of single-phase electrical spring (ES), a critical load current feedback control strategy considering grid voltage is proposed. Taking pure resistive loads as an example, the S-domain mathematical model of ES is established. Based on this, the design method is described in detail. Aiming at the voltage fl uctuation of power grid aff ects the regulation precision of ES, the feedforward control of grid voltage is proposed. Through the equivalent transformation of control block diagrams, the feedforward transfer function of grid voltage which can eff ectively eliminate the infl uences of grid voltage on the regulation precision of ES is deduced. Finally, the eff ectiveness and correctness of the proposed control method is verifi ed by experiments
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Torque Ripple Suppression for Permanent-Magnet Synchronous Motor based on Enhanced LADRC Strategy
Zhang Zhaoyuan,Chen Yao,Tan Lisi,Zhao Chaohui 대한전기학회 2022 Journal of Electrical Engineering & Technology Vol.17 No.5
Permanent-Magnet Synchronous Motor has shown advanced performance in the industry, but its smooth operation is aff ected by torque ripple. The conventional Linear Active Disturbance Rejection Controller (LADRC) has a strong anti-interference ability. However, this usually makes it more sensitive to measurement noise, reducing steady-state accuracy. This study proposes an Enhanced LADRC controller to obtain strong system disturbance and noise suppression performance. Firstly, the total disturbance diff erential signal is introduced into the Linear Extended State Observer to improve the anti-disturbance ability of the system, and the bandwidth parameter confi guration method is used to reduce the number of parameters be adjusted in the controller to two. Second, A Fal-Filter is built through the nonlinear function and inserted into the controller to weaken the measurement noise. Finally, the simulation model is established on the dSPACE motor control platform, and the corresponding control algorithm is implemented. Simulation and experimental results show that the control scheme can signifi cantly improve the phase current distortion and reduce torque ripple.
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Zhaoyuan Zhang,Yao Chen,Xinpeng Feng,Shirui Xie,Chaohui Zhao 전력전자학회 2022 JOURNAL OF POWER ELECTRONICS Vol.22 No.8
A Linear Active Disturbance Rejection Control (LADRC) method with a Variable Gain Load Torque Sliding Mode Observer (VLTSMO) is proposed in this paper to reduce the effects of the load torque disturbance of Interior Permanent-Magnet Synchronous Motors (IPMSMs). First, the LADRC is used as a speed loop controller, and the linear extended state observer (LESO) is used to observe the total disturbance. Then the stability of the controller is analyzed. Second, the VLTSMO is proposed, which can output a feedforward compensation signal to improve the observation capability of the observer. In addition, after comparing several standard switching functions, the continuous switching function is selected to reduce the chattering phenomenon. Finally, a 5.5 kW IPMSM is taken as the research object. A simulation model and the dSPACE motor control platform are used to realize the algorithm. Both simulation and experimental results show that the VLTSMO has excellent observation capabilities. They also show that the LADRC + VLTSMO method can effectively improve the dynamic performance and robustness of the speed control system.
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