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Nowadays, the dual closed-loop Proportional-Integral-Lead (PI-Lead) controller is widely used, especially for the servo systems where high performance is required for motion control, like lithography machines and vehicle-used Lidars. Considering complex industrial applications and working conditions, more comprehensive and systematic research about the structure and potential problem of the PI-Lead controller is necessary for enhancing its performance and robustness. In this paper, the failure mechanism of the classic Anti-Windup methods in the PI-Lead controller is analyzed. By adjusting the location of control blocks, a novel reversed-structure-based PI-Lead controller is proposed as a complement to the traditional anti-windup methods for effective operation, and to make the system stable under the severe impact disturbance. Then, a self-commissioning strategy is designed, based on a Fast Root Mean Square Error (FRMSE) index and without additional manual tuning factors. Compared with classic indicators, the proposed FRMSE index can achieve faster instability detection and accelerate the tuning process to protect the equipment.
Yangyang Chen; Ming Yang; KaiYuan Liu; Jiang Long; Dianguo Xu; Frede Blaabjerg. Reversed-Structure-Based PI-Lead Controller Anti-Windup Design and Self-Commissioning Strategy for Servo Drive Systems. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.
AMA StyleYangyang Chen, Ming Yang, KaiYuan Liu, Jiang Long, Dianguo Xu, Frede Blaabjerg. Reversed-Structure-Based PI-Lead Controller Anti-Windup Design and Self-Commissioning Strategy for Servo Drive Systems. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.
Chicago/Turabian StyleYangyang Chen; Ming Yang; KaiYuan Liu; Jiang Long; Dianguo Xu; Frede Blaabjerg. 2021. "Reversed-Structure-Based PI-Lead Controller Anti-Windup Design and Self-Commissioning Strategy for Servo Drive Systems." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.
With the increase of load resistance, the impedance angle of the rectifier with passive C filter also increases, which may have some negative effects on the characteristics of the inductive power transfer (IPT) system. This paper presents an impedance analysis method for C-filter rectifiers in continuous conduction mode (CCM). The calculation formula of critical load resistance is given and the relevant values are calculated. An improved C-filter rectifier circuit is proposed to reduce the phase angle of the IPT system. A very tiny capacitance is connected in parallel at the input end of the rectifier to reduce the impedance angle as load resistance changes, with hardly increased costs. This improved method not only improves the system efficiency, but also reduces the fluctuation of output voltage or current. Simulation and experiment results verify the feasibility of the proposed topology. A 1kW prototype with S/S compensation topology was built. The maximum system efficiency from DC power supply to the load is 94.5%. The efficiency under rated load is as high as 93%. Compared with traditional method, it has increased by 0.6%.
Jianwei Mai; Xianrui Zeng; Yousu Yao; Yijie Gae Wang; Dian Guo Xu. Impedance Analysis and Design of IPT System to Improve System Efficiency and Reduce Output Voltage or Current Fluctuations. IEEE Transactions on Power Electronics 2021, 36, 14029 -14038.
AMA StyleJianwei Mai, Xianrui Zeng, Yousu Yao, Yijie Gae Wang, Dian Guo Xu. Impedance Analysis and Design of IPT System to Improve System Efficiency and Reduce Output Voltage or Current Fluctuations. IEEE Transactions on Power Electronics. 2021; 36 (12):14029-14038.
Chicago/Turabian StyleJianwei Mai; Xianrui Zeng; Yousu Yao; Yijie Gae Wang; Dian Guo Xu. 2021. "Impedance Analysis and Design of IPT System to Improve System Efficiency and Reduce Output Voltage or Current Fluctuations." IEEE Transactions on Power Electronics 36, no. 12: 14029-14038.
In the voltage source inverter (VSI) applications, inverter nonlinearities would affect the parameter identification process in many ways. Hence, this paper proposes an offline identification method for resistance and dq-axis inductance surface by considering the inverter nonlinearity characteristics. A variable amplitude square-wave injection (VASI) scheme is proposed for the dq-axis inductance identification. The VASI method achieves the inductance identification with a novel data sampling strategy. Meanwhile, it can also establish the inductance surfaces by only a few identified data points with a polynomial fitting algorithm, which greatly reduces the identification time compared with the existing methods. The resistance identification is realized by a slope signal injection method, in which the effect of IGBT voltage drop is analyzed. In order to improve the identification accuracy, the inverter nonlinearities are compensated by a self-learning method considering the zero-axis voltage at different rotor positions. At the same time, the sampling error in zero current zones (ZCZs) of abc phases is researched. In order to verify the effectiveness and generality, the proposed method is carried out on two different test machines and confirmed by finite element analysis (FEA).
Qiwei Wang; Nannan Zhao; Gaolin Wang; Shouhua Zhao; Zhixue Chen; Guoqiang Zhang; Dian Guo Xu. An Offline Parameter Self-Learning Method Considering Inverter Nonlinearity With Zero-Axis Voltage. IEEE Transactions on Power Electronics 2021, 36, 14098 -14109.
AMA StyleQiwei Wang, Nannan Zhao, Gaolin Wang, Shouhua Zhao, Zhixue Chen, Guoqiang Zhang, Dian Guo Xu. An Offline Parameter Self-Learning Method Considering Inverter Nonlinearity With Zero-Axis Voltage. IEEE Transactions on Power Electronics. 2021; 36 (12):14098-14109.
Chicago/Turabian StyleQiwei Wang; Nannan Zhao; Gaolin Wang; Shouhua Zhao; Zhixue Chen; Guoqiang Zhang; Dian Guo Xu. 2021. "An Offline Parameter Self-Learning Method Considering Inverter Nonlinearity With Zero-Axis Voltage." IEEE Transactions on Power Electronics 36, no. 12: 14098-14109.
In this paper, a 10 MHz DC/DC converter based on 3D aircore transformer with zero-phase difference synchronous driving signals is designed. By using the characteristics of no leakage inductance in the inner winding of the nested toroidal air core transformer, the phase difference between the output voltage of the inverter and the input voltage of the rectifier can be regarded as zero, so that the rectifier and the inverter can use the same driving signal, which simplifies the control of the synchronous rectifier switches, and realizes the reliable and efficient synchronous rectification control at 10MHz. The prototypes with primary and secondary compensation are proposed and the experimental results verify the feasibility of the proposed control method and numerical design method.
Yueshi Guan; Zhenyu Shi; Chang Liu; Yijie Wang; Dian Guo Xu. A 10 MHz DC/DC Converter With Zero-Phase Difference Synchronous Driving Signal. IEEE Transactions on Power Electronics 2021, 36, 13878 -13888.
AMA StyleYueshi Guan, Zhenyu Shi, Chang Liu, Yijie Wang, Dian Guo Xu. A 10 MHz DC/DC Converter With Zero-Phase Difference Synchronous Driving Signal. IEEE Transactions on Power Electronics. 2021; 36 (12):13878-13888.
Chicago/Turabian StyleYueshi Guan; Zhenyu Shi; Chang Liu; Yijie Wang; Dian Guo Xu. 2021. "A 10 MHz DC/DC Converter With Zero-Phase Difference Synchronous Driving Signal." IEEE Transactions on Power Electronics 36, no. 12: 13878-13888.
Many reduced common mode voltage (CMV) modulation methods have been proposed for three-level inverters. However, most of them suffer from large current distortion because only part of the available base vectors are utilized. The interleaved paralleling can reduce both CMV and the output current distortion, though the CMV reduction is limited and large zero-sequence circulating current (ZSCC) is inevitably caused by the phase-shifted carriers. To further reduce the CMV while maintaining smaller current distortion and ZSCC, a five-level reduced CMV (RCMV) modulation method is proposed in this paper, which treats the parallel inverters as a whole. Theoretical analysis reveals that the integrated modulation provides additional base vectors that contribute to smaller total harmonic distortion (THD) of the current, and the selected vectors ensure the nearest-three-vector synthesis and half-reduced CMV. The switching sequences design and neutral point balancing strategy are also developed for dual-parallel three-level inverters, ensuring that the average circulating current is zero and the neutral point voltage is balanced, which are both critical to the proper operation of parallel inverters. Superior performance in terms of CMV, THD and ZSCC provided by the proposed method in comparison with conventional modulation is verified by comprehensive simulation and experiment results.
Li Weiwei; Zhang Xueguang; Zhang Feiyu; Zhang Siyuan; Fu Zhichao; Gaolin Wang; Dian Guo Ge Xu. Integrated Modulation of Dual-Parallel Three-Level Inverters With Reduced Common Mode Voltage and Circulating Current. IEEE Transactions on Power Electronics 2021, 36, 13332 -13344.
AMA StyleLi Weiwei, Zhang Xueguang, Zhang Feiyu, Zhang Siyuan, Fu Zhichao, Gaolin Wang, Dian Guo Ge Xu. Integrated Modulation of Dual-Parallel Three-Level Inverters With Reduced Common Mode Voltage and Circulating Current. IEEE Transactions on Power Electronics. 2021; 36 (11):13332-13344.
Chicago/Turabian StyleLi Weiwei; Zhang Xueguang; Zhang Feiyu; Zhang Siyuan; Fu Zhichao; Gaolin Wang; Dian Guo Ge Xu. 2021. "Integrated Modulation of Dual-Parallel Three-Level Inverters With Reduced Common Mode Voltage and Circulating Current." IEEE Transactions on Power Electronics 36, no. 11: 13332-13344.
Wireless power transmission technology is used to transmit energy without contact in the field of electric vehicles, consumer electronics and other industries. Among them, there are some applications with very low coupling coefficient where multilayer coil needs to be wound. Influenced by the parasitic capacitor between layers, the loss of the multilayer coil increases. The improved coil winding method and compensation method are proposed in this letter. Winding coils following the same sequence from outside to inside in each layer and connecting capacitors in series between layers of the coil can significantly reduce the voltage of the layers parasitic capacitor, which will decrease the coil loss. Compared with traditional method, the improved method increases the system efficiency at heavy load and light load by 0.74% and 2.48%, respectively. A 1-kW prototype was built with the maximum efficiency of 93.58%.
Jianwei Mai; Xianrui Zeng; Yousu Yao; Yijie Wang; Dianguo Xu. Improved Winding and Compensation Methods for the Multi-layer Coil in IPT System. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.
AMA StyleJianwei Mai, Xianrui Zeng, Yousu Yao, Yijie Wang, Dianguo Xu. Improved Winding and Compensation Methods for the Multi-layer Coil in IPT System. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.
Chicago/Turabian StyleJianwei Mai; Xianrui Zeng; Yousu Yao; Yijie Wang; Dianguo Xu. 2021. "Improved Winding and Compensation Methods for the Multi-layer Coil in IPT System." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.
The overmodulation-based nonlinear voltage extension could increase the maximum output torque of induction motor (IM) in field-weakening (FW) region. Since the voltage distortion increases with the deepening of overmodulation degree, the extreme nonlinear voltage extension (six-step voltage) is only worthwhile in maximum torque demand condition. However, the conventional overmodulation-FW scheme always adopts the six-step voltage regardless of torque demand, leading to severe torque ripple. To solve this problem, the minimum- nonlinear-voltage (MNV) method is proposed to satisfy the torque demand with minimum overmodulation-voltage nonlinearity. The difference between the limiting and the feedback values of the torque current is used for suppressing the nonlinear voltage extension during non- maximum torque demand state. The quantitative relation between the torque ripple and torque demand of the MNV method are calculated and compared with that of the conventional six-step-FW method. Analysis shows that the MNV method can eliminate the torque ripples of low and medium torque demand condition completely and partially, respectively. The effectiveness of the proposed method is verified experimentally on a 3.7kW IM platform.
Xu Zhang; Bo Wang; Yong Yu; Jing Zhang; Dianguo Xu. Minimum-Nonlinear-Voltage Method for Torque Ripple Suppression in Induction Motor Overmodulation and Field-Weakening Control. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.
AMA StyleXu Zhang, Bo Wang, Yong Yu, Jing Zhang, Dianguo Xu. Minimum-Nonlinear-Voltage Method for Torque Ripple Suppression in Induction Motor Overmodulation and Field-Weakening Control. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.
Chicago/Turabian StyleXu Zhang; Bo Wang; Yong Yu; Jing Zhang; Dianguo Xu. 2021. "Minimum-Nonlinear-Voltage Method for Torque Ripple Suppression in Induction Motor Overmodulation and Field-Weakening Control." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.
In order to extend the lifetime and save the system cost, the film capacitor is applied in the DC-link of IPMSM drives. Many active damping control methods have been carried out to improve the drive system stability, which needs the accurate value of the DC-link film capacitor. In this letter, an online DC-link capacitance estimation method is investigated for reduced capacitance IPMSM drives, which does not need any additional signal injection or sensor. The power coupling characteristics are analyzed to obtain the instantaneous power of the DC-link capacitor from the inverter and the grid sides. The band-pass filter is applied to extract the DC-link voltage and capacitor power with twice the frequency of the grid voltage. The DC-link capacitance could be estimated by the fundamental component of the DC-link voltage. The proposed method can be used for different kinds of load types and motor types of the drive system. Experimental results are performed to verify the estimation method, and the estimation error is within 1%.
Nannan Zhao; Runfeng Gao; Gaolin Wang; Dawei Ding; Guoqiang Zhang; Dian Guo Xu. Online Estimation Method of DC-Link Capacitors for Reduced DC-Link Capacitance IPMSM Drives. IEEE Transactions on Power Electronics 2021, 36, 12196 -12201.
AMA StyleNannan Zhao, Runfeng Gao, Gaolin Wang, Dawei Ding, Guoqiang Zhang, Dian Guo Xu. Online Estimation Method of DC-Link Capacitors for Reduced DC-Link Capacitance IPMSM Drives. IEEE Transactions on Power Electronics. 2021; 36 (11):12196-12201.
Chicago/Turabian StyleNannan Zhao; Runfeng Gao; Gaolin Wang; Dawei Ding; Guoqiang Zhang; Dian Guo Xu. 2021. "Online Estimation Method of DC-Link Capacitors for Reduced DC-Link Capacitance IPMSM Drives." IEEE Transactions on Power Electronics 36, no. 11: 12196-12201.
In this paper, a 10MHz low-profile converter for bendable equipment based on aircore inductor is proposed. The mathematical model and inductance calculation method of bendable planar circular spiral coil under different bending situations is analyzed. An optimal design method of T type matching network is depicted in detail which helps to guarantee soft-switching characteristics and high efficiency within the whole bending range by realizing weak inductive equivalent input impedance. A 32V input, 9V/6.3W output prototype is proposed in the laboratory and the experimental results verify the feasibility of the proposed optimal design methodology, the system efficiency can be improved by 4% than the traditional method.
Yueshi Gae Guan; Chang Liu; Yijie Wang; Wei Wang; Dian Guo Xu. Analysis and Design of a High-Frequency Low-Profile Converter for Bendable Equipment. IEEE Transactions on Power Electronics 2021, 36, 12834 -12842.
AMA StyleYueshi Gae Guan, Chang Liu, Yijie Wang, Wei Wang, Dian Guo Xu. Analysis and Design of a High-Frequency Low-Profile Converter for Bendable Equipment. IEEE Transactions on Power Electronics. 2021; 36 (11):12834-12842.
Chicago/Turabian StyleYueshi Gae Guan; Chang Liu; Yijie Wang; Wei Wang; Dian Guo Xu. 2021. "Analysis and Design of a High-Frequency Low-Profile Converter for Bendable Equipment." IEEE Transactions on Power Electronics 36, no. 11: 12834-12842.
the capability of misalignment tolerance is vital for an IPT (inductive power transfer) system. A new loosely coupled transformer structure with series solenoid and DD pads (SDDP) was proposed in this paper to improve the misalignment tolerance of the IPT system. The designed loosely coupled transformer not only has strong misalignment-tolerant capability in the X-direction, but also has strong misalignment-tolerant capability in the Y-direction. The fluctuation of mutual inductance is 3.15% within 67.0% misalignment distance of largest size of the SDDP in the X-direction and 44% misalignment distance of largest size of the SDDP in the Y-direction. Finally, an LCC/S compensated IPT system with 300W power was built as an example to demonstrate the performance of the proposed LCT. The output voltage fluctuates with rated load is less than 3.2%. And the efficiency is 90.2%91.3%.
Jianwei Mai; Yijie Wang; Yousu Yao; Mengzhou Sun; Dianguo Xu. High-Misalignment Tolerant IPT Systems with Solenoid and Double D pads. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.
AMA StyleJianwei Mai, Yijie Wang, Yousu Yao, Mengzhou Sun, Dianguo Xu. High-Misalignment Tolerant IPT Systems with Solenoid and Double D pads. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.
Chicago/Turabian StyleJianwei Mai; Yijie Wang; Yousu Yao; Mengzhou Sun; Dianguo Xu. 2021. "High-Misalignment Tolerant IPT Systems with Solenoid and Double D pads." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.
Due to the advantages of strong robustness and fast convergence, the sliding-mode observer (SMO) is considered as an effective approach for sensorless surface-mounted permanent magnet synchronous motor (SPMSM) drives. However, the inherent chattering and none finite-time convergence are still challenging problems in SMO application. To address these problems, this paper proposed a high-order terminal SMO (HOTSMO) for SPMSM position estimation. First, a terminal sliding-mode surface is designed to achieve finite-time convergence of state variables. Second, a high-order sliding-mode control law is presented to achieve chattering suppression. Compared with the conventional SMO, the studied HOTSMO can achieve high estimation accuracy without sacrificing strong robustness of SMO. The effectiveness of the studied scheme is experimentally verified on a 4.4kW ARM-based SPMSM platform.
Bo Wang; Yanzhen Shao; Yong Yu; Qinghua Dong; Zhipeng Yun; Dian Guo Xu. High-Order Terminal Sliding-Mode Observer for Chattering Suppression and Finite-Time Convergence in Sensorless SPMSM Drives. IEEE Transactions on Power Electronics 2021, 36, 11910 -11920.
AMA StyleBo Wang, Yanzhen Shao, Yong Yu, Qinghua Dong, Zhipeng Yun, Dian Guo Xu. High-Order Terminal Sliding-Mode Observer for Chattering Suppression and Finite-Time Convergence in Sensorless SPMSM Drives. IEEE Transactions on Power Electronics. 2021; 36 (10):11910-11920.
Chicago/Turabian StyleBo Wang; Yanzhen Shao; Yong Yu; Qinghua Dong; Zhipeng Yun; Dian Guo Xu. 2021. "High-Order Terminal Sliding-Mode Observer for Chattering Suppression and Finite-Time Convergence in Sensorless SPMSM Drives." IEEE Transactions on Power Electronics 36, no. 10: 11910-11920.
Accurate rotor position estimation is important to ensure the high-performance operation of position sensorless permanent magnet synchronous motor (PMSM) drives. To suppress the estimated rotor position offset error (RPOE) caused by the cross-saturation effect and the system digital time delay, etc. for high-frequency signal injection (HFSI) based methods, a current vector angle adaptive adjustment (CVAAA) based online compensation method is proposed. This method can accurately detect and compensate the RPOE online only using two current vectors and has low sensitivity to the motor parameters, which improves the robustness of the system. Additionally, the two current vector angles can be adaptively adjusted according to the load conditions to improve the signal-to-noise ratio and reduce the current amplitude fluctuation during the RPOE detection process. Since neither offline measurement nor finite element analysis is required, this method has superior adaptability and universality for applications. The effectiveness and feasibility are verified by experiments on a 2.2-kW interior PMSM drive platform.
Guangdong Bi; Nannan Zhao; Guoqiang Zhang; Runze Jing; Gaolin Wang; Dian Guo Xu. Current Vector Angle Adaptive Adjustment Based Rotor Position Offset Error Suppression Method for Sensorless PMSM Drives. IEEE Transactions on Power Electronics 2021, 36, 10536 -10547.
AMA StyleGuangdong Bi, Nannan Zhao, Guoqiang Zhang, Runze Jing, Gaolin Wang, Dian Guo Xu. Current Vector Angle Adaptive Adjustment Based Rotor Position Offset Error Suppression Method for Sensorless PMSM Drives. IEEE Transactions on Power Electronics. 2021; 36 (9):10536-10547.
Chicago/Turabian StyleGuangdong Bi; Nannan Zhao; Guoqiang Zhang; Runze Jing; Gaolin Wang; Dian Guo Xu. 2021. "Current Vector Angle Adaptive Adjustment Based Rotor Position Offset Error Suppression Method for Sensorless PMSM Drives." IEEE Transactions on Power Electronics 36, no. 9: 10536-10547.
This paper proposes a position and speed detection method based on the cross-decoupling network filtering (CDNF) method combined with phase-locked loop (PLL). This method is used to enhance the detection precision of position and reduce the speed fluctuation at low-speed operation for gearless traction motor drives with an ordinary-resolution encoder. The harmonic distributions of the discontinuous orthogonal position signal in low-speed region are analysed. On this basis, the position and speed detection method based on the CDNF with PLL is presented to obtain the harmonics of the discontinuous position signal adaptively for eliminating the position detection error and improving the accuracy of the speed feedback. The criteria of the filter parameter design are presented based on the maximum phase margin theory to maintain the stability of the system. Experiments were carried out on an 11.7kW permanent magnet gearless traction motor drive with an ordinary-resolution encoder installed. The experimental results verify the effectiveness of the proposed method at low-speed operation.
Yin Bai; Gaolin Wang; Guoqiang Zhang; Nannan Zhao; Dian Guo Xu. Position and Speed Detection Method Based on Cross-Decoupling Network Filtering for Gearless Traction Motor Drives at Low-Speed Operation. IEEE Transactions on Power Electronics 2021, 36, 11862 -11874.
AMA StyleYin Bai, Gaolin Wang, Guoqiang Zhang, Nannan Zhao, Dian Guo Xu. Position and Speed Detection Method Based on Cross-Decoupling Network Filtering for Gearless Traction Motor Drives at Low-Speed Operation. IEEE Transactions on Power Electronics. 2021; 36 (10):11862-11874.
Chicago/Turabian StyleYin Bai; Gaolin Wang; Guoqiang Zhang; Nannan Zhao; Dian Guo Xu. 2021. "Position and Speed Detection Method Based on Cross-Decoupling Network Filtering for Gearless Traction Motor Drives at Low-Speed Operation." IEEE Transactions on Power Electronics 36, no. 10: 11862-11874.
A novel multi-resonant DC-DC converter is presented in this paperwhich owns a wide input voltage range and better voltage gain characteristics. Due to the addition of an anti-resonant tank with notch filter function, the converter introduces third harmonics in the power transmission, which can reduce the circulating energy in the resonant tank and reduce the loss of rectifier diode, thus improving the efficiency. The CL-LLC converter can realize soft switching in full load range. This paper introduces the operating principle of the converter and the method of the parameters design. Finally, a 350V-500V input and 24V/400W prototype is designed to verify the correctness of the theory.
Xiangjun Zhang; Jiachen Jing; Yueshi Guan; Mingcong Dai; Yijie Wang; Dian Guo Xu. High-Efficiency High-Order CL-LLC DC/DC Converter With Wide Input Voltage Range. IEEE Transactions on Power Electronics 2021, 36, 10383 -10394.
AMA StyleXiangjun Zhang, Jiachen Jing, Yueshi Guan, Mingcong Dai, Yijie Wang, Dian Guo Xu. High-Efficiency High-Order CL-LLC DC/DC Converter With Wide Input Voltage Range. IEEE Transactions on Power Electronics. 2021; 36 (9):10383-10394.
Chicago/Turabian StyleXiangjun Zhang; Jiachen Jing; Yueshi Guan; Mingcong Dai; Yijie Wang; Dian Guo Xu. 2021. "High-Efficiency High-Order CL-LLC DC/DC Converter With Wide Input Voltage Range." IEEE Transactions on Power Electronics 36, no. 9: 10383-10394.
Beat phenomenon is an important issue for the practical application of electrolytic capacitorless motor drives. In this study, the characteristics of stator current harmonics caused by the voltage sampling delay are analyzed. Further, the beat phenomenon generated from the interaction between the harmonics and the fundamental currents is investigated, and the envelope feature of the stator current is derived mathematically. For the purpose of suppressing the beat phenomenon, a voltage reconstruction strategy is proposed to reduce the influence of DC link voltage sampling delay at the six times of grid frequency. By utilizing the reconstructed DC link voltage for calculation of PWM duty ratio, the beat phenomenon can be attenuated significantly. The proposed method can be integrated into motor control system easily. Experimental results show the effectiveness of the proposed strategy in a prototype of electrolytic capacitorless permanent magnet synchronous motor drive.
Dawei Ding; Nannan Zhao; Gaolin Wang; Guoqiang Zhang; Xueguang Zhang; Nenad Mijatovic; Dianguo Xu. Suppression of Beat Phenomenon for Electrolytic Capacitorless Motor Drives Accounting for Sampling Delay of DC Link Voltage. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.
AMA StyleDawei Ding, Nannan Zhao, Gaolin Wang, Guoqiang Zhang, Xueguang Zhang, Nenad Mijatovic, Dianguo Xu. Suppression of Beat Phenomenon for Electrolytic Capacitorless Motor Drives Accounting for Sampling Delay of DC Link Voltage. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.
Chicago/Turabian StyleDawei Ding; Nannan Zhao; Gaolin Wang; Guoqiang Zhang; Xueguang Zhang; Nenad Mijatovic; Dianguo Xu. 2021. "Suppression of Beat Phenomenon for Electrolytic Capacitorless Motor Drives Accounting for Sampling Delay of DC Link Voltage." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.
Position sensorless control has been widely studied for electrical rotor position estimation. However, because of the magnetic periodicity, mechanical rotor position sensorless control of multi-pole electric machine was hardly reported. By increasing the control dimensions, this paper proposes novel machine topologies named as Dual-gap Dual-pole Composite Machines (DDCMs), where the mechanical rotor position can be demodulated from the electrical rotor positions of two air gaps. The machine topologies and corresponding control theory are elaborated, and one of the topologies is selected as the primary prototype, which is composed of a Permanent Magnet Synchronous Machine (PMSM) with 6 poles and a Variable Reluctance Resolver (VRR) with 4 poles. Detailed design and analysis on the prototype along with the control strategy are presented. Finally, experiments are carried out based on the prototype to verify the feasibility of the proposed methodology.
Ronggang Ni; Shizhuang Gu; Shuxin Nie; Frede Ge Blaabjerg; Xinzhen Wu; Dian Guo Xu. Dual-Gap Dual-Pole Composite Machine for Mechanical Rotor Position Estimation. IEEE Transactions on Power Electronics 2021, 36, 10481 -10489.
AMA StyleRonggang Ni, Shizhuang Gu, Shuxin Nie, Frede Ge Blaabjerg, Xinzhen Wu, Dian Guo Xu. Dual-Gap Dual-Pole Composite Machine for Mechanical Rotor Position Estimation. IEEE Transactions on Power Electronics. 2021; 36 (9):10481-10489.
Chicago/Turabian StyleRonggang Ni; Shizhuang Gu; Shuxin Nie; Frede Ge Blaabjerg; Xinzhen Wu; Dian Guo Xu. 2021. "Dual-Gap Dual-Pole Composite Machine for Mechanical Rotor Position Estimation." IEEE Transactions on Power Electronics 36, no. 9: 10481-10489.
For mechanical resonance suppression, the bi-quad filter is a powerful tool and has been widely used in industrial applications. Compared with the notch filter, the bi-quad filter has one more parameter for notch depth design, which is more suitable for servo systems with nature damping coefficients and limited resonant gains. Usually, the bi-quad filter tuning has three steps, including identification, discretization, and switching process. However, in industrial applications, these three steps still have room for improvement. In this paper, three targeted modification methods are proposed. Firstly, an identification method based on the twins-point search is proposed to find out all of the available potential elastic characteristics accurately and quickly, and get the resonant frequency, the rejection bandwidth, and the notch depth for filter design. Then, inspired by the discretization distortion correction of the notch filter, a parameter mapping Tustin method is used to achieve accurate discretization. Furthermore, considering the bi-quad filter's settling time, a warm-up buffer strategy prior to the filter switch-on is proposed to smooth the switching process. In the end, the validity and effectiveness of the proposed modification strategies are verified by experimental results.
Yangyang Chen; Ming Yang; Yongping Sun; Jiang Long; Dian Guo Xu; Frede Ge Blaabjerg. A Modified Bi-Quad Filter Tuning Strategy for Mechanical Resonance Suppression in Industrial Servo Drive Systems. IEEE Transactions on Power Electronics 2021, 36, 10395 -10408.
AMA StyleYangyang Chen, Ming Yang, Yongping Sun, Jiang Long, Dian Guo Xu, Frede Ge Blaabjerg. A Modified Bi-Quad Filter Tuning Strategy for Mechanical Resonance Suppression in Industrial Servo Drive Systems. IEEE Transactions on Power Electronics. 2021; 36 (9):10395-10408.
Chicago/Turabian StyleYangyang Chen; Ming Yang; Yongping Sun; Jiang Long; Dian Guo Xu; Frede Ge Blaabjerg. 2021. "A Modified Bi-Quad Filter Tuning Strategy for Mechanical Resonance Suppression in Industrial Servo Drive Systems." IEEE Transactions on Power Electronics 36, no. 9: 10395-10408.
A novel distributed fixed-time control system is proposed to optimize the power allocation for DC multi-microgrids (MGs). In which, MG-control and cluster-control layers are proposed to handle the economic operation in a fixed-time manner for individual MGs and multi-MGs, respectively. In each MG, the primary and the secondary controllers match DGs’ incremental costs (ICs) as well as restore MG’s average voltage, within a fixed time regardless of the initial conditions, to guarantee the optimal load dispatch while considering line losses, generation-demand power balance and DGs’ generation limits. For the multi-MGs, the distributed tertiary controllers optimize the power flow between MGs by adjusting their voltages references to achieve the minimum global total production cost. The developed controller is distinguished with its accelerated convergence rate independent of the initial states as compared to the existing works. The efficacy of the proposed controller is proven by rigorous analysis and verified by comprehensive simulation, and experimental results.
Mohamed Zaery; Panbao Wang; Wei Wang; Dianguo Xu. A novel fully distributed fixed-time optimal dispatch of DC multi-microgrids. International Journal of Electrical Power & Energy Systems 2021, 129, 106792 .
AMA StyleMohamed Zaery, Panbao Wang, Wei Wang, Dianguo Xu. A novel fully distributed fixed-time optimal dispatch of DC multi-microgrids. International Journal of Electrical Power & Energy Systems. 2021; 129 ():106792.
Chicago/Turabian StyleMohamed Zaery; Panbao Wang; Wei Wang; Dianguo Xu. 2021. "A novel fully distributed fixed-time optimal dispatch of DC multi-microgrids." International Journal of Electrical Power & Energy Systems 129, no. : 106792.
The lateral misalignment for static electric vehicle (EV) wireless charging could be much larger than 100 mm if the parking assistance systems are unavailable. This paper proposes a split flat solenoid coupler (SFSC) to significantly extend the lateral misalignment and reduce the copper and ferrite usage. To obtain a good balance among coupling, misalignment tolerance, and cost, an optimization method for SFSC is proposed where the size limitations and ferrite tile specifications are considered. The optimized SFSC is compared with two magnetic couplers recommended in SAE J2954 in terms of coupling coefficient and misalignment tolerance. To eliminate the impact of coil size and make the comparison fair, the quantified misalignment tolerance is introduced. The proposed SFSC provides much better misalignment tolerance than the recommended couplers. A 1000-W prototype is built to show the advantages of the proposed coupler. The output current keeps unchanged when the lateral misalignment is as high as 400 mm. A highest power transfer efficiency, from DC input to DC output, of 89.12% is achieved when the output power is 1000 W.
Yousu Yao; Shenghan Gao; Jianwei Mai; Xiaosheng Liu; Xiangjun Zhang; Dianguo Xu. A Novel Misalignment Tolerant Magnetic Coupler for Electric Vehicle Wireless Charging. IEEE Journal of Emerging and Selected Topics in Industrial Electronics 2021, PP, 1 -1.
AMA StyleYousu Yao, Shenghan Gao, Jianwei Mai, Xiaosheng Liu, Xiangjun Zhang, Dianguo Xu. A Novel Misalignment Tolerant Magnetic Coupler for Electric Vehicle Wireless Charging. IEEE Journal of Emerging and Selected Topics in Industrial Electronics. 2021; PP (99):1-1.
Chicago/Turabian StyleYousu Yao; Shenghan Gao; Jianwei Mai; Xiaosheng Liu; Xiangjun Zhang; Dianguo Xu. 2021. "A Novel Misalignment Tolerant Magnetic Coupler for Electric Vehicle Wireless Charging." IEEE Journal of Emerging and Selected Topics in Industrial Electronics PP, no. 99: 1-1.
This paper proposes a kind of Cubic Magnetic Coupler (CMC) for Inductive Power Transfer (IPT) system, which has huge application potential in the charging field of moving targets. The CMC can still maintain sufficient coupling coefficient when used for long-distance wireless power transfer, it also has great capability of Misalignment Tolerance (MT). Distance-to-Diameter Ratio (DDR) is defined to eliminate the impact of coil size and make the comparison between different couplers fairer and easier. This paper optimizes the parameters and shape of the CMC. Then, the proposed coupler is compared with several existing couplers employed in long-distance IPT systems. Double-sided LCC compensation topology is chosen to limit the current flowing through the coupling coils. A CMC with an outer size of $180 \times 180 \times 180 mm^{3}$ was made, based on which an IPT prototype was built. The superiorities of the proposed coupler were verified by a series of experiments. When the DDR equals 3, the coupling coefficient of the CMC is 0.00985, and the maximum DC-DC and AC-AC efficiencies are 64.9% and 72.8%, respectively.
Yijie Wang; Peng Gu; Yousu Yao; Dianguo Xu. Analysis and Design of Cubic Magnetic Coupler for High Distance-to-Diameter Ratio IPT Systems. IEEE Transactions on Industrial Electronics 2021, PP, 1 -1.
AMA StyleYijie Wang, Peng Gu, Yousu Yao, Dianguo Xu. Analysis and Design of Cubic Magnetic Coupler for High Distance-to-Diameter Ratio IPT Systems. IEEE Transactions on Industrial Electronics. 2021; PP (99):1-1.
Chicago/Turabian StyleYijie Wang; Peng Gu; Yousu Yao; Dianguo Xu. 2021. "Analysis and Design of Cubic Magnetic Coupler for High Distance-to-Diameter Ratio IPT Systems." IEEE Transactions on Industrial Electronics PP, no. 99: 1-1.