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A Multi-load Parity-Time Symmetric Wireless power Transmission System Inspired by Non-Hermitian Physics

IEEE Journal of Emerging and Selected Topics in power electronics 2025年

作者： Xu, Biao-Biao Wu, Zi-Xuan Wen, You-Long Ma, Xiao-San Cheng, Mu-Tian Anhui University of Technology Anhui Provincial Key Lab of Power Electronics & Motion Control School of Electrical Engineering & Information Maanshan243002 China

We designed a novel multi-load Parity-Time (PT) symmetry wireless power transmission (WPT) system inspired by non-Hermitian physics. This system can selectively and robustly transfer energy across multiple loads. Firstly, a new coil structure was designed to enable the system to operate in six modes and the system in different modes all belong to the PT system. Secondly, a variable operating frequency and monitoring device were designed based on the frequency characteristics of the PT-WPT system. The system can selectively operate in any mode based on the operating frequency of the transmitting device. Furthermore, the coupled receiving coils of the system are different in different operating modes. Finally, the selection of the receiving coil and load can be achieved by simply changing the operating frequency of the transmitting device. The experimental results indicate that the system exhibits insensitivity to internal interference and can concentrate the transmitted energy on one load by changing the operating mode, achieving robust directional energy transfer. There is almost no influence between the internal coils and the system can maintain stable energy transmission when any coil in the system is misaligned horizontally, vertically, or at an angle. © 2013 IEEE.

关键词： Inductive power transmission

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A Novel Soft-start Method for SVG Based on D-axis Orientation

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Chinese Journal of Electrical Engineering 2021年第1期7卷 55-62页

作者： Shicheng Zheng Ying Shu Mengmeng Qi Jiahong Lang Xuefeng Hu School of Electrical and Information Engineering Anhui University of TechnologyMa’anshan 243002China Key Lab of Power Electronics&Motion Control Anhui University of TechnologyMa’anshan 243002China

In this paper,a novel method for shock-free soft-start is *** novel method can realize the aim of no-overshoot and inrush of current during the entire soft-start process,thus the start process is safe,stable,and *** the uncontrolled rectification stage ends,a sinusoidal signal synchronized with the grid voltage is generated through dq coordinate transformation and D-axis orientation,then the signal is transmitted to the three-phase inverter *** AC voltage output of the inverter bridge is superimposed on both ends of the soft-start resistor along with the *** open-loop control method is adopted to gradually reduce the modulation ratio of the sinusoidal PWM wave until the capacitor voltage on the DC side reaches the rated voltage value,then the soft-start resistor is removed,which means the shock-free soft-start process is *** results prove the effectiveness and feasibility of the control strategy proposed in this paper.

关键词： Soft-start coordinate transformation modulation ratio shock-free D-axis orientation

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Polarization Conversion of Single Photon via Scattering by a Λ System in a Semi-Infinite Waveguide

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Chinese Physics Letters 2019年第5期36卷 27-30页

作者： Fu-Qiang Yu Mu-Tian Cheng Shao-Ming Li Xiao-San Ma Zhi-Feng Zhu Xian-Shan Huang Anhui Provincial Key Lab of Power Electronics and Motion Control Anhui University of TechnologyMaanshan 243002 School of Electrical Engineering and Information Anhui University of TechnologyMaanshan 243002 School of Mathematics and Physics Anhui University of TechnologyMaanshan 243002

We theoretically investigate single-photon polarization conversion via scattering by an atom with Λ configuration coupled to a semi-infinite waveguide and discuss the two cases in which the Λ system is non-degenerated and degenerated. By applying the hard-wall boundary condition of the semi-infinite waveguide, it is found that singlephoton polarization conversion can be realized with unit probability for both cases under the ideal *** with the polarization conversion, the frequency conversion of a single photon can also be realized with unit probability in the ideal case if the Λ system is not degenerated.

关键词： Polarization Conversion Single Photon via Scattering

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Switching Transformer-Based LLC Resonant Converter for Efficiency Improvement in Wide Range of Light Load

Switching Transformer-Based LLC Resonant Converter for Effic...

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International Conference on Electrical Machines and Systems (ICEMS)

作者： Xiaodong Liu Baocheng Dong Sucheng Liu Huihui Wu Kun Zhang Provincial Key Lab of Power Electronics and Motion Control Anhui University of Technology Maanshan China

ISBN: (纸本)9781728133997

Traditional LLC resonant converter takes the rated power as the design requirement to calculate the resonant parameters. Although voltage gain in full load range is guaranteed, the problem of low efficiency under light load is ignored at the same time. This paper proposes a switching transformer-based LLC resonant converter (ST-LLC). Combined with the corresponding strategy of high-frequency transformer switching control, the efficiency of ST-LLC resonant converter is improved, especially in light load conditions. The design procedure of main component parameters is given in detail, and an optimal load partition control strategy is proposed to further broaden the optimized range of light load efficiency. Finally, a prototype about 1kW based on ST-LLC topology was built to verify the proposed scheme. It is shown that the efficiency of the prototype is achieved at 95% maximally, and maintains 90% in 82% of the full load range.

关键词： Inductance Resonant converters Switches Topology Resonant frequency Cavity resonators

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Nonreciprocal Single Photon Frequency Conversion via Chiral Coupling between a V-Type System and a Pair of Waveguides

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Chinese Physics Letters 2018年第5期35卷 34-38页

作者： Ce Shi Mu-Tian Cheng Xiao-San Ma Dong Wang Xianshan Huang Bing Wang Jia-Yan Zhang School of Electrical Engineering and Information Anhui University of TechnologyMaanshan 243002 School of Mathematics and Physics Anhui University of TechnologyMaanshan 243002 Anhui Provincial Key Lab of Power Electronics ＆ Motion Control Anhui University of TechnologyMaanshan 243002

The single photon frequency conversion is investigated theoretically in the system composed of a V-type system chiral coupling to a pair of waveguides. The single photon scattering amplitudes are obtained using the real-space Hamiltonian. The calculated results show that the probability of single photon frequency down-or up-conversion can reach a unit by choosing appropriate parameters in the non-dissipative system with perfect chiral *** present a nonreciprocal single photon beam splitter whose frequency of the output photon is different from that of the input photon. The influences of dissipations and non-perfect chiral coupling on the single frequency conversion are also shown. Our results may be useful in designing quantum devices at the single-photon level.

关键词： Nonreciprocal Single Photon Frequency Conversion via Chiral Coupling between a V-Type System and a Pair of Waveguides

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Digital capacitor charge balance control strategy of bidirectional DC/DC converter in DC microgrid

Digital capacitor charge balance control strategy of bidirec...

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Youth Academic Annual Conference of Chinese Association of Automation (YAC)

作者： Xiaodong Liu Yangyang Gan Sucheng Liu Yan-Fei Liu Key Lab of Power Electronics & Motion Control Anhui University of Technology Maanshan China Department of Electrical and Computer Engineering Queen's University Kingston Canada

ISBN: (纸本)9781538629024

DC microgrids (MGs) have many potential advantages compared with AC microgrids, which have attracted more and more attention in recent years. However, DC bus voltage control of these systems can be an important issue undergoing the power surplus or deficit. An energy buffer in the DC MG powered by the bidirectional DC/DC converter with energy storage systems (ESS) such as super capacitor were investigated. In this paper, a novel hybrid control algorithm based on capacitor charge balance control (CBC) for the bidirectional DC/DC converter to achieve near-optimal dynamic performance is presented. A hybrid control strategy is proposed in order to make the DC MG recover from a sudden bus current step change with the smallest voltage deviation in the shortest settling time. And a set of equations are developed to design the proposed hybrid controller. The effectiveness and the fast transient performance of the proposed hybrid approach has been verified by PSIM simulation results.

关键词： Capacitors Microgrids Inductors Steady-state Voltage control Switches Transient analysis

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Double Integral Sliding Mode control of Paralleled DC/DC Converters

Double Integral Sliding Mode Control of Paralleled DC/DC Con...

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IEEE Conference on Industrial electronics and Applications

作者： Zong-xiang Chen Jian Wang Lu-sheng Ge Ting Jiang Yi-fan Liu Yan-fei Liu Key Lab of Power Electronics & Motion Control Anhui University of Technology Ma'anshan Anhui China

ISBN: (纸本)9781479984671

The use of dc-dc converters connected in parallel is a suitable way to solve the technological problems that arise in large-capability power supply systems. This paper presents a new approach to parallel converters using double integral sliding mode control. This approach could alleviating the steady-state regulation error and enhancing dynamic current-sharing property by increasing the order of the proportional integral sliding mode (ISM) controllers using an additional integral term. Theoretical analysis and simulation results are provided for verification.

关键词： Paralleled DC/DC Converters Integral Sliding Mode(ISM) control Double-integral sliding mode (DISM) Current-sharing

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Research On Delay-dependent Stability of Parallel DC-DC Converter System Based on a Wireless Communication

Research On Delay-dependent Stability of Parallel DC-DC Conv...

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IEEE Conference on Industrial electronics and Applications

作者： Zong-xiang Chen Ting Jiang Lu-sheng Ge Jian Wang Yi-fan Liu Yan-fei Liu Key Lab of Power Electronics & Motion Control Anhui University of Technology Ma'anshan Anhui China

ISBN: (纸本)9781479984671

The current-sharing technology based on Wireless communication allows the current of DC-DC parallel system to be divided equally very well. However, the information transmitted by the network inevitably exist a transmission delay, which makes the traditional system into a time-delay systems. This paper presents a method to comput the Critical Delay of a DC-DC Parallel delay system. The method uses frequency-domain techniques and the DCDC Parallel System linearized average model to obtain the critical delay. Then a Simulation Model with two parallel modules was built. And the main circuit of the modules is BUCK converter. Finally using the MATlab.simulation tools, we demonstrate the correctness of the method.

关键词： time delay Paralleled DC-DC converters linearized averaged model State space equation

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Optimal control Strategy for Buck Converter Under Successive Load Current Change

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Transactions of Nanjing University of Aeronautics and Astronautics 2014年第5期31卷 530-537页

作者：方炜刘晓东刘雁飞 Key Lab of Power Electronics and Motion Control Anhui University of Technology Queen's University Kingston K7L3N6Canada

A new control algorithm is presented for digitally controlled dc-dc converters to achieve a fast response under a successive *** the steady-state condition,the tight voltage regulation is processed by the conventional digital PID *** the load disturbance is significant,the controller switches to an optimal control *** the integration of the capacitor current,the proposed algorithm predicts the optimal switch over time based on the charge balance control,and the minimal voltage derivation and recovery time are thus achieved when the load current has a successive *** method for calculating the optimal switch over time is described,and the implementation of the proposed algorithm with a digital controller is treated in ***,the simulation and experiment results are provided to validate the effectiveness of the approaches.

关键词： dc-dc converter charge balance control(CBC) successive load-change dynamic response

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Virtual flux based direct power control for three-level PWM rectifier 17

Virtual flux based direct power control for three-level PWM ...

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2014 17th International Conference on Electrical Machines and Systems, ICEMS 2014

作者： Yingchao, Zhang Liping, Jin Yongchang, Zhang Ting, Lu Zhengming, Zhao Key Lab. of Special Power Supply of PLA Chongqing Communication Institute China North China University of Technology Power Electronics and Motor Drive Engineering Research Center China State Key Lab. of Control and Simulation of Power System and Generation Equipments Tsinghua University China

ISBN: (纸本)9781479951611

This paper presents a new control strategy for three-level neutral point clamped (NPC) pulse width modulated (PWM) rectifier without power source voltage sensors. The relationship between instantaneous power and voltage vectors is derived mathematically. Virtual flux is estimated and used to calculate the phase of the power source voltage and instantaneous power. On these bases, a direct power control (DPC) scheme for three-level PWM rectifier is presented. An optimal switching table is established, vector switching scheme and balance strategy for the neutral point potential are discussed. Variable switching frequency and dynamic process of the startup are also analyzed. Experimental results have verified the theoretical approach and the three-level PWM rectifier with proposed DPC based on virtual flux exhibits several advantages, such as simple algorithm, low costs and excellent dynamic performance. © 2014 IEEE.

关键词： Electric rectifiers

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