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Analysis and Design of Finite Input Inductance Class-E Inverters with Variable Complex Loads 24

Analysis and Design of Finite Input Inductance Class-E Inver...

引用

24th IEEE Workshop on Control and Modeling for Power Electronics, COMPEL 2023

作者： Wang, Yufei Sun, Min Cai, Dongsheng Li, Jian Huang, Qi Pan, Siming University of Electronic Science and Technology of China School of Mechanical and Electrical Engineering Chengdu China Institute of Electronic and Information Engineering of Uestc in Guangdong Dongguan China College of Nuclear Technology and Automation Engineering Chengdu University of Technology Chengdu China Southwest University of Science and Technology Mianyang China

ISBN: (纸本)9798350316186

This paper presents a detailed analysis and design method of the Class-E inverter with finite input inductance under arbitrary complex loads based on the first harmonic approximation. The analytic results show that the inverter can achieve ZVS with a wide range of complex loads with proper resonant network design. The model established allows designers to plot the theoretical ZVS load impedance region for specific design parameters directly in the complex plane. Subsequently a design method for the inverter to achieve high efficiency operation under variable complex loads is developed. This method thus allows the Class-E inverter to be used in an application in which the load resistance varies as well as the reactance. The effectiveness of the proposed method is verified by a 13.56 MHz Class-E inverter prototype. © 2023 IEEE.

关键词： Inductance

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Technique for Anomaly Information Reconstruction in Airborne Radiation Data Based on Dictionary Learning Algorithm

Technique for Anomaly Information Reconstruction in Airborne...

引用

2023 International Conference on Computer Applications technology, CCAT 2023

作者： Xiong, Chao Wang, Xin Qiao, Xin Zhou, Zhi Wu, Hexi Ministry of Education Engineering Research Center of Nuclear Technology Application Nanchang China East China University of Technology School of Nuclear Science and Engineering Nanchang China Chengdu University of Technology The College of Nuclear Technology and Automation Engineering Chengdu China

ISBN: (纸本)9798350301540

This paper introduced the K-SVD algorithm of machine learning to Decompose and Reconstruct the airborne radiation data. According to the sparse representation method, the inaccuracy of gridding interpolation due to the mismatch of data dimension was reduced and then a self-adaptive dictionary was constructed via training the original data. After reconstruction by dictionary learning, the increase in terms of two indicators peak signal-to-noise ratio (PSNR) and structural similarity index measure (SSIM) as well as the noise signal extracted which obeyed a stripe-like distribution along the sideline testified that the KSVD encoding learning processing technique had effective results in reconstructing and de-noising airborne radiation data. © 2023 IEEE.

关键词： Signal to noise ratio

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Common Mode Voltage Suppression of Three-to-Six-Phase Indirect Matrix Converter Based on 6-Virtual Vector Method 10

Common Mode Voltage Suppression of Three-to-Six-Phase Indire...

引用

10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Ma, Kai Lu, Ke Guo, Jiling Xiao, Tianlong Southwest Jiaotong University College of Electrical Engineering Chengdu611756 China National Rail Transit Electrification and Automation Engineering Technology Research Center Chengdu611756 China

ISBN: (纸本)9798350351330

This article proposes a new modulation method that can suppress the maximum common mode voltage of a six phase output indirect matrix converter by 50%, while also taking into account the suppression of multi-phase output harmonic ***, the size of common mode voltage was studied considering only the switching state of the inverter stage. Based on the principles of minimizing common mode voltage and synthesizing harmonic voltage to zero, a virtual vector of inverter stage 6 was constructed. Secondly, the magnitude of common mode voltage when the rectification stage vector and the inverter stage 6 virtual vector act together was studied. Based on this, the rectification stage vector and inverter stage virtual vector were selected based on the minimum common mode voltage of different sectors. This can suppress the common mode voltage generated by the effective vector of the six phase output indirect matrix converter to 0.29Vin, and the common mode voltage generated by the zero vector to 0.5Vin © 2024 IEEE.

关键词： Matrix converters

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Research on the Influence of Different Wiring Methods on the Conversion Results of Transformer Low-Voltage no-Load Test 4

Research on the Influence of Different Wiring Methods on the...

引用

4th International Conference on Power and Energy technology, ICPET 2022

作者： Ren, Xinyue Zhao, Shenyuan Li, Weijia Chen, Tianxiang Chengdu University of Technology College of Nuclear Technology and Automation Engineering Chengdu Sichuan China

ISBN: (数字)9781665480796

ISBN: (纸本)9781665480796

The no-load test of the transformer is an important item of the power transformer insulation preventive test, but due to the limitation of the test conditions, the field test cannot reach the rated voltage. Usually, the no-load test data measured at low voltage is converted into the no-load loss under the rated voltage. Determine the transformer condition. In this paper, the no-load test of S7-50/35 three-phase oil-immersed power transformer through five different wiring methods, the no-load loss measured under low voltage is converted to the no-load loss under rated voltage, and the experimental research and analysis are carried out. The measurement error of no-load loss under six wiring methods is discussed, and the influence of different wiring methods on the conversion result of no-load loss is discussed. The research results show that the test is carried out under the rated voltage of 22.5%~32.5%, and when the wiring method is not connected to the neutral point or only connected to the neutral point of the power supply side, the no-load loss conversion error is the smallest, and the maximum error is 3%. © 2022 IEEE.

关键词： Electric transformer testing

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Reduced Switching-Count SVM for Power Flow Control of Single-Stage Multiport Inverter-Fed Hybrid Electric Vehicles 10

Reduced Switching-Count SVM for Power Flow Control of Single...

引用

10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Zhang, Zhao Zhou, Dehong Shen, Zewei Zou, Jianxiao University of Electronic Science and Technology of China Shenzhen Institute for Advanced Study Shenzhen China University of Electronic Science and Technology of China School of Automation Engineering Chengdu China

ISBN: (纸本)9798350351330

The single-stage multiport inverter (SSMI) is becoming more and more popular as an attractive solution for hybrid electric vehicles (HEVs). By removing the dc-dc converter, there is an energy flow path between the multiple sources and the motor, which can reduce the power conversion stage and improve the integration of the inverter. However, there are some difficulties with the design of modulation strategies for SSMI, due to the highly coupled characteristics of multiple energy sources on the dc side and the heavy computational burden of the unevenly distributed space vector diagram. In addition, reducing switching losses and improving energy conversion efficiency is always the focus of SSMI. Given this, this paper proposed a reduced switching-count space vector modulation (SVM) scheme for the power flow control of SSMI. In the proposed SVM scheme, the SSMI is decoupled into two independent inverters to avoid burden computation under the unsymmetrical space vector diagram, and the total switching count is restricted to 3, which reduces the switching losses and improves the power conversion efficiency of the SSMI. Experimental results validate the effectiveness of our proposed scheme. © 2024 IEEE.

关键词： Electric inverters

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A Flexible Power Allocation Strategy for Dual-DC-Port Inverter-Connected PV-Battery Hybrid Systems 49

A Flexible Power Allocation Strategy for Dual-DC-Port Invert...

引用

49th Annual Conference of the IEEE Industrial Electronics Society, IECON 2023

作者： Liu, Lijie Zhou, Dehong Zou, Jianxiao School of Automation Engineering University of Electronic Science and Technology China Chengdu China School of Automation Engineering Uestc Chengdu China Shenzhen Institute of Advanced Study Uestc Chengdu China

ISBN: (纸本)9798350331820

Dual-dc-port inverter can directly connect photo-voltaic (PV) and battery to ac-grid without dc-dc converter, providing a low-cost, small-volume, and high-efficiency solution for PV-battery hybrid systems. However, it is challenging to design the modulation scheme for the dual-dc-port inverter due to the unbalanced dc-link and coupled port power control feature. To realize flexible power allocation and achieve satisfactory current quality under unbalanced dc-link voltage, this article proposes a hybrid modulation-based flexible power allocation strategy for the dual-dc-port inverter. In the proposed strategy, flexible active power allocation for each port is achieved by proportionally splitting the desired voltage vector, and the split voltage vector for each port is implemented by the hybrid modulation. With the hybrid modulation, challenges for modulation scheme design under unbalanced dc port voltage are also avoided. Experimental tests are conducted to verify the effectiveness of the proposed power allocation strategy. And experimental results indicate that the proposed strategy has beneficial steady-state and dynamic performance. © 2023 IEEE.

关键词： Hybrid systems

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Zero-Vector-Placement-Based Power Ripple Suppression for Single-Stage Multi-Port Rectifier Under Unbalanced Grid Voltages 10

Zero-Vector-Placement-Based Power Ripple Suppression for Sin...

引用

10th IEEE International Power Electronics and Motion Control Conference, IPEMC 2024 ECCE Asia

作者： Liao, Kai Zhou, Dehong Shen, Zewei Zou, Jianxiao University of Electronic Science and Technology of China Shenzhen Institute for Advanced Study Shenzhen China University of Electronic Science and Technology of China School of Automation Engineering Chengdu China

ISBN: (纸本)9798350351330

Active power ripple suppression serves as a promising solution to limit power ripples induced by three-phase gird voltage imbalances. These schemes, nonetheless, typically need to add supplementary power switches, resulting in increased costs. To alleviate the dilemma, a single-stage multi-port rectifier, which provides extra power control freedom for buffering power ripples with no extra power switches, is proposed in this article. Following that, an equivalent two-level model with a simple structure is employed to simplify the controller design for the rectifier. With the constructed two-level model, a zero-vector-placement-based power ripple suppression strategy is developed, which allows active power ripples induced by the unbalanced AC grid to be transferred into the ripple port of the rectifier. Finally, the experimental results based on a three-phase three-level multi-port rectifier system confirm the effectiveness of the proposed scheme. © 2024 IEEE.

关键词： Electric rectifiers

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Research on Generation Mechanism and Variation Characteristics of Single-phase Ground Overvoltage in Medium Voltage Transmission Line

Research on Generation Mechanism and Variation Characteristi...

引用

2022 IEEE International Conference on High Voltage engineering and Applications, ICHVE 2022

作者： Zhao, Shenyuan Chen, Tianxiang Ren, Xinyue Xu, Huikai Yang, Bowen College of Nuclear Technology and Automation Engineering Chengdu University of Technology Sichuan Chengdu China

ISBN: (纸本)9781665407502

In the experimental research on the impact of 10-35kV wildfire and tree line faults on transmission lines, it was found that are grounding overvoltage were generated. This paper studies and analyzes the mechanism of overvoltage generation. The research analyzes the three-phase voltage and zero sequence voltage caused by overvoltage. Variation characteristics, when resonance occurs, the random voltage of one phase is less than the voltage of the other two phases, and the magnitude of this voltage is determined by the neutral point displacement voltage;the moment of arc overvoltage will cause the amplitude of the zero sequence voltage and the non-fault phase voltage to be rapid within 0.6ms, the fault phase voltage is lower than the rated voltage, and presents a power frequency cycle change trend. Modeling and simulation were carried out by PSCAD/EMPTC simulation software, and the variation characteristics of arc overvoltage between metal and high resistance grounding were verified. © 2022 IEEE.

关键词： Electric lines

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Design and Realization of a High-Precision Cavity Optomechanical Accelerometer 7

Design and Realization of a High-Precision Cavity Optomechan...

引用

7th IEEE International Conference on Electronic Information and Communication technology, ICEICT 2024

作者： Xian, Chengwei Kuang, Pengju Li, Zhe Li, Xinwei Luo, Xiaoliang Ji, Zhe Wen, Guangjun Huang, Yongjun University of Electronic Science and Technology of China School of Information and Communication Engineering Chengdu China Chengdu Technological University School of Electronic Engineering Chengdu611730 China University of Electronic Science and Technology of China School of Information and Communication Engineering Chengdu611731 China University of Electronic Science and Technology of China School of Automation Engineering Chengdu China National Innovation Institute of Defense Technology Academy of Military Science PLA Beijing China Shijiazhuang Tiedao University School of Mechanical Engineering Shijiazhuang China

ISBN: (纸本)9798350384437

This paper proposes the development of a high-precision cavity optomechanical accelerometer. It is composed of a photonic crystal cavity structure and a straight-beam mechanical oscillator structure that are designed on a silicon on SOI (Silicon-On-Insulator) wafer with a top silicon thickness of 500 nm. The working principle of the cavity optomechanical accelerometer is analyzed, the mechanical modes of the mechanical oscillator and the optical modes of the photonic crystal cavity are simulated, the theoretical detection accuracy of the accelerometer is calculated to be 5.86 ug Hz, and the accelerometer samples are further fabricated by using the micro-nano-machining process. The accelerometer is characterized by high sensitivity and low noise, which can be widely used in the fields of high-precision vibration detection, inertial measurement and inertial navigation. © 2024 IEEE.

关键词： Silicon wafers

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A Parallel Fusion of CNN and Transformer for CT Lung Nodule Detection 4

A Parallel Fusion of CNN and Transformer for CT Lung Nodule ...

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4th International Conference on Electronic Information engineering and Computer Science, EIECS 2024

作者： Liu, Wei He, Jin School of Communication and Information Engineering Shanghai Technical Institute of Electronics & Information Shanghai China School of Automation Chengdu University of Information Technology Chengdu China

ISBN: (纸本)9798331531409

To improve the precision of CT lung nodule detection, this paper presents a parallel fusion model based on CNN and Transformer network, which integrates features of the two networks to fully utilize the high-resolution spatial information of CNN and the global semantic information of Transformer, thereby enhancing the model's expressive capability and providing high-quality input for downstream tasks. Experimental results show that the proposed improves the sensitivity of detection and reduce the false positive rate based on anatomical features, while also considering algorithm efficiency. © 2024 IEEE.

关键词： Computerized tomography

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