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Pulse Density Modulated ZVS Full-Bridge Converters for Wireless Power Transfer Systems EI Scopus SCIE
期刊论文 | 2019 , 34 (1) , 369-377 | IEEE Transactions on Power Electronics
SCOPUS Cited Count: 2
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Abstract :

Pulse density modulation (PDM) is an advanced technique for maximum efficiency point tracking (MEPT) of wireless power transfer (WPT) systems. By using PDM, both voltage regulation and efficiency maximization can be achieved without dc/dc converters. PDM is also compatible with the dual-side soft switching technique that utilizes resonant tanks and synchronous rectification. However, this soft switching technique depends on coupling and load conditions. Hard switching may occur when the coupling of coils gets stronger or the equivalent load is not properly controlled. To eliminate the dependence and ensure the soft switching under various operating conditions, this paper proposes a PDM zero-voltage-switching (ZVS) full-bridge converter for WPT systems. The converter employs a ZVS branch between switching nodes to provide a ZVS current, and uses a specially designed modulator to obtain the valid ZVS current waveforms. Experimental results verified the proposed operating principles and showed that the additional power loss caused by the ZVS current is insignificant. The overall efficiency of the WPT prototype was 93 ~ 73 % when the power transfer distance was 0.1 ~ 0.4 m, among which up to 85% efficiency was observed when the distance equaled the coil diameter. IEEE

Keyword :

Efficiency maximization Full bridge converters Point tracking Pulse density modulation Soft-switching technique Synchronous rectification Wireless power transfer Wireless power transfer (WPT)

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GB/T 7714 Li, Hongchang , Wang, Kangping , Fang, Jingyang et al. Pulse Density Modulated ZVS Full-Bridge Converters for Wireless Power Transfer Systems [J]. | IEEE Transactions on Power Electronics , 2019 , 34 (1) : 369-377 .
MLA Li, Hongchang et al. "Pulse Density Modulated ZVS Full-Bridge Converters for Wireless Power Transfer Systems" . | IEEE Transactions on Power Electronics 34 . 1 (2019) : 369-377 .
APA Li, Hongchang , Wang, Kangping , Fang, Jingyang , Tang, Yi . Pulse Density Modulated ZVS Full-Bridge Converters for Wireless Power Transfer Systems . | IEEE Transactions on Power Electronics , 2019 , 34 (1) , 369-377 .
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Duality-Free Decomposition Based Data-Driven Stochastic Security-Constrained Unit Commitment EI Scopus SCIE
期刊论文 | 2019 , 10 (1) , 82-93 | IEEE Transactions on Sustainable Energy
SCOPUS Cited Count: 1
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Abstract :

To incorporate the superiority of both stochastic and robust ap-proaches, a data-driven stochastic optimization is employed to solve the security constrained unit commitment model. This ap-proach makes the full use of the historical data information to generate a set of possible probability distributions for wind pow-er output and optimizes the unit commitment under the worst-case probability distribution. However, this model suffers from huge computational burden, as a large number of scenarios are considered. To resolve this problem, a duality-free decomposi-tion method is proposed in this paper. This approach does not require the step of dualization, which can save a large set of dual variables and constraints, and therefore reduces the computa-tional burden. In addition, due to the special structure of the second stage, the proposed method can be decomposed into in-dependent sub-problems that are solved in parallel, which fur-thermore improves the computational efficiency. A numerical study on an IEEE 118-bus system with practical data of a wind power system has demonstrated the effectiveness of the proposal. IEEE

Keyword :

Computational model Robust optimization Security constrained unit commitment Stochastic optimizations Uncertainty Wind speed

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GB/T 7714 Ding, Tao , Yang, Qingrun , Liu, Xiyuan et al. Duality-Free Decomposition Based Data-Driven Stochastic Security-Constrained Unit Commitment [J]. | IEEE Transactions on Sustainable Energy , 2019 , 10 (1) : 82-93 .
MLA Ding, Tao et al. "Duality-Free Decomposition Based Data-Driven Stochastic Security-Constrained Unit Commitment" . | IEEE Transactions on Sustainable Energy 10 . 1 (2019) : 82-93 .
APA Ding, Tao , Yang, Qingrun , Liu, Xiyuan , Huang, Can , Yang, Yongheng , Wang, Min et al. Duality-Free Decomposition Based Data-Driven Stochastic Security-Constrained Unit Commitment . | IEEE Transactions on Sustainable Energy , 2019 , 10 (1) , 82-93 .
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Electrical and thermal phenomena in low-density polyethylene/carbon black composites near the percolation threshold EI Scopus SCIE
期刊论文 | 2019 , 136 (6) | Journal of Applied Polymer Science
SCOPUS Cited Count: 1
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Abstract :

Low-density polyethylene (LDPE)/carbon black (CB) composites were fabricated via melt-compounding technique. The percolation threshold was found to be around 20 wt % CB, and an electrical network formed by conductive CB was proven by scanning electron microscopy investigation. Dielectric responses depicted an interfacial relaxation peak at 20 wt % CB content. LDPE/CB composites showed an electric field-dependent conductivity as and a hysteresis behavior around the percolation threshold region. The CB particles with high thermal conductivity increased the heat conductance of the LDPE/CB20 up to 56%. The dynamic mechanical analysis of the LDPE/CB composites exhibited a noticeable contribution of CB throughout the composites, increasing the storage and loss modulus. The physical interactions between CB particles in the filler network enhanced the thermal degradation of the LDPE/CB25 composite for more than 76°C. The maximum breakdown strength of the LDPE/CB composites appeared with an approximately 10% improvement for LDPE/CB5 than pure LDPE. © 2018 Wiley Periodicals, Inc.

Keyword :

Dielectric response Field dependent conductivity High thermal conductivity Interfacial relaxation Low Density Polyethylene (LDPE) Percolation thresholds Physical interactions Storage and loss modulus

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GB/T 7714 Azizi, Sohrab , David, Eric , Fréchette, Michel F. et al. Electrical and thermal phenomena in low-density polyethylene/carbon black composites near the percolation threshold [J]. | Journal of Applied Polymer Science , 2019 , 136 (6) .
MLA Azizi, Sohrab et al. "Electrical and thermal phenomena in low-density polyethylene/carbon black composites near the percolation threshold" . | Journal of Applied Polymer Science 136 . 6 (2019) .
APA Azizi, Sohrab , David, Eric , Fréchette, Michel F. , Nguyen-Tri, Phuong , Ouellet-Plamondon, Claudiane M. . Electrical and thermal phenomena in low-density polyethylene/carbon black composites near the percolation threshold . | Journal of Applied Polymer Science , 2019 , 136 (6) .
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Neutral-Point Voltage Analysis and Suppression for NPC Three-Level Photovoltaic Converter in LVRT Operation under Imbalanced Grid Faults with Selective Hybrid SVPWM Strategy EI Scopus SCIE
期刊论文 | 2019 , 34 (2) , 1334-1355 | IEEE Transactions on Power Electronics
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Abstract :

Balanced issues of neutral-point (NP) voltage in the neutral-point-clamped (NPC) three-level photovoltaic converter have been deeply studied. Numerous algorithms for NP voltage control have been proposed and proven to be effective in normal operations. However, most of previous studies fail to consider effect of imbalanced loads on NP voltage, especially under low-voltage-ride-through (LVRT) condition, which faces problems of imbalanced grid voltages and low power factor. In this paper, through derivation of NP current model for different loading conditions, the behavior of NP voltage under LVRT condition is comprehensively analyzed for the first time. Then, theoretical limitations of NP voltage control based on two common space-vector-pulse-width modulations (SVPWM) that three-nearest-vectors and symmetric SVPWM are investigated, and additional low-frequency oscillation in NP voltage is analyzed. This oscillation is dominated by fundamental frequency and has different generation mechanisms under different imbalanced grid faults. Then, a novel method of selective hybrid SVPWM, as selective combinations of SVPWM and virtual SVPWM according to different imbalanced grid faults, is proposed to effectively suppress NP voltage oscillations in LVRT operation without any complex improvements and increase of DC-link capacitor values. Finally, the analytical result and performance of proposed method are confirmed in an existing 300kW NPC converter. IEEE

Keyword :

Low voltage ride through (LVRT) Neutral point clamped Neutral-point voltage balances Photovoltaic converter Space vector pulse width modulation

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GB/T 7714 Li, Yang , Yang, Xu , Chen, Wenjie et al. Neutral-Point Voltage Analysis and Suppression for NPC Three-Level Photovoltaic Converter in LVRT Operation under Imbalanced Grid Faults with Selective Hybrid SVPWM Strategy [J]. | IEEE Transactions on Power Electronics , 2019 , 34 (2) : 1334-1355 .
MLA Li, Yang et al. "Neutral-Point Voltage Analysis and Suppression for NPC Three-Level Photovoltaic Converter in LVRT Operation under Imbalanced Grid Faults with Selective Hybrid SVPWM Strategy" . | IEEE Transactions on Power Electronics 34 . 2 (2019) : 1334-1355 .
APA Li, Yang , Yang, Xu , Chen, Wenjie , Liu, Tao , Zhang, Feng . Neutral-Point Voltage Analysis and Suppression for NPC Three-Level Photovoltaic Converter in LVRT Operation under Imbalanced Grid Faults with Selective Hybrid SVPWM Strategy . | IEEE Transactions on Power Electronics , 2019 , 34 (2) , 1334-1355 .
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A Single Gate Driver Based Solid-State Circuit Breaker Using Series Connected SiC MOSFETs EI Scopus SCIE
期刊论文 | 2019 , 34 (3) , 2002-2006 | IEEE Transactions on Power Electronics
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Abstract :

Semiconductor devices based solid-state circuit breakers (SSCBs) are promising in the DC power distribution system as protective equipment for their ultra-short action time. This letter proposes a topology of SSCB using series connected silicon carbide (SiC) MOSFETs, which only requires a single isolated gate driver. The SSCB has very low cost and high reliability because it only has 13 components including passive components and diodes apart from two SiC MOSFETs to achieve both balanced voltage distribution during short-circuit interruption duration and reliable positive gate voltage during on-state. The SSCB prototype is built and experimentally verified to interrupt 75 A short-circuit current under the DC bus voltage of 1200 V within 1.5 &#x03BC;s. IEEE

Keyword :

Gate drivers Integrated circuit reliability MOS-FET Series connections SiC MOSFET Solid State Circuit Breaker Voltage balancing Wide band gap devices

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GB/T 7714 Ren, Yu , Yang, Xu , Zhang, Fan et al. A Single Gate Driver Based Solid-State Circuit Breaker Using Series Connected SiC MOSFETs [J]. | IEEE Transactions on Power Electronics , 2019 , 34 (3) : 2002-2006 .
MLA Ren, Yu et al. "A Single Gate Driver Based Solid-State Circuit Breaker Using Series Connected SiC MOSFETs" . | IEEE Transactions on Power Electronics 34 . 3 (2019) : 2002-2006 .
APA Ren, Yu , Yang, Xu , Zhang, Fan , Wang, Fei , Tolbert, Leon M. , Pei, Yunqing . A Single Gate Driver Based Solid-State Circuit Breaker Using Series Connected SiC MOSFETs . | IEEE Transactions on Power Electronics , 2019 , 34 (3) , 2002-2006 .
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Architectural Exploration to Address the Reliability Challenges for ReRAM-Based Buffer in SSD EI Scopus SCIE
期刊论文 | 2019 , 66 (1) , 226-238 | IEEE Transactions on Circuits and Systems I: Regular Papers
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Abstract :

Hybrid solid state drive based on ReRAM and NAND flash technologies has shown promising performance and energy efficiency. In this application, ReRAM is mainly used as a non-volatile buffer to hold recently accessed data pages or address mapping information. The previous studies on the ReRAM-based buffer mainly focus on performance and efficiency improvement, while reliability issues are not taken into consideration. Nevertheless, according to our quantitative evaluation, the limited endurance and random bit errors pose challenges to ReRAM-based buffer design. For example, without wear leveling, the raw lifetime of ReRAM-based SSD buffer may be as low as 0.02 year for some specific I/O traces. Therefore, we propose two efficient architecture techniques, i.e., multi-bloom-filter-based wear leveling and hybrid error protection, to improve the lifetime and reduce the error protection cost of ReRAM-based buffer, respectively. Simulation results demonstrate that the proposed wear leveling technique can extend the lifetime of ReRAM-based buffer by $34.7x$ on average. The proposed hybrid error protection scheme can improve the response time by at least 4.2&#x0025; compared with other error protection schemes. IEEE

Keyword :

Address mappings Efficiency improvement Efficient architecture Non-volatile memory Prototypes Quantitative evaluation Random bit errors Solid state drives

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GB/T 7714 Zhao, Xiaoqing , Sun, Hongbin , Liu, Longjun et al. Architectural Exploration to Address the Reliability Challenges for ReRAM-Based Buffer in SSD [J]. | IEEE Transactions on Circuits and Systems I: Regular Papers , 2019 , 66 (1) : 226-238 .
MLA Zhao, Xiaoqing et al. "Architectural Exploration to Address the Reliability Challenges for ReRAM-Based Buffer in SSD" . | IEEE Transactions on Circuits and Systems I: Regular Papers 66 . 1 (2019) : 226-238 .
APA Zhao, Xiaoqing , Sun, Hongbin , Liu, Longjun , Yang, Yang , Dai, Liangliang , Wu, Xiulong et al. Architectural Exploration to Address the Reliability Challenges for ReRAM-Based Buffer in SSD . | IEEE Transactions on Circuits and Systems I: Regular Papers , 2019 , 66 (1) , 226-238 .
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A Composite Exponential Model to Characterize Nonlinearity Causing Passive Intermodulation Interference Scopus SCIE
期刊论文 | 2019 , 61 (2) , 590-594 | IEEE Transactions on Electromagnetic Compatibility
SCOPUS Cited Count: 1
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Abstract :

IEEEPassive intermodulation (PIM) interference that occurs in communication systems could limit the communication capacity and increase the manufacturing and maintenance costs. In this letter, a composite exponential model is developed to characterize the weak nonlinearity of passive components that causes PIM generation accurately. This proposed model fully considers the correlation between the PIM products on each order and the relation of PIM products with variation of carrier powers. For verification, a microwave filter is given to demonstrate the effectiveness of this composite model, and the reliability of this model is proved by the sensitivity analysis due to measurement uncertainty. Besides, the good agreement between the calculated powers of PIM products and the measured data shows that it can provide a theoretical guidance for PIM performance assessment in engineering application, thereby evaluating the influence of PIM interference on communication quality effectively.

Keyword :

Composite exponential model microwave filter nonlinearity passive intermodulation (PIM) sensitivity analysis

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GB/T 7714 Zhang, Lei , Wang, Hongguang , Shen, Jialin et al. A Composite Exponential Model to Characterize Nonlinearity Causing Passive Intermodulation Interference [J]. | IEEE Transactions on Electromagnetic Compatibility , 2019 , 61 (2) : 590-594 .
MLA Zhang, Lei et al. "A Composite Exponential Model to Characterize Nonlinearity Causing Passive Intermodulation Interference" . | IEEE Transactions on Electromagnetic Compatibility 61 . 2 (2019) : 590-594 .
APA Zhang, Lei , Wang, Hongguang , Shen, Jialin , Wei, Huan , Wang, Xinbo , Li, Yongdong et al. A Composite Exponential Model to Characterize Nonlinearity Causing Passive Intermodulation Interference . | IEEE Transactions on Electromagnetic Compatibility , 2019 , 61 (2) , 590-594 .
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Literature review on modeling and simulation of energy infrastructures from a resilience perspective EI SSCI SCIE
期刊论文 | 2019 , 183 , 360-373 | Reliability Engineering and System Safety
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Abstract :

Recent years have witnessed an increasing frequency of disasters, both natural and human-induced. This applies pressure to critical infrastructures (CIs). Among all the CI sectors, the energy infrastructure plays a critical role, as almost all other CIs depend on it. In this paper, 30 energy infrastructure models dedicated for the modeling and simulation of power or natural gas networks are collected and reviewed using the emerging concept of resilience. Based on the review, typical modeling approaches for energy infrastructure resilience problems are summarized and compared. The authors, then, propose five indicators for evaluating a resilience model; namely, catering to different stakeholders, intervening in development phases, dedicating to certain stressor and failure, taking into account different interdependencies, and involving socio-economic characteristics. As a supplement, other modeling features such as data needs and time scale are further discussed. Finally, the paper offers observations of existing energy infrastructure models as well as future trends for energy infrastructure modeling. © 2018

Keyword :

Energy infrastructures Model and simulation Model evaluation Natural gas networks Power grids Resilience

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GB/T 7714 Wang, Jing , Zuo, Wangda , Rhode-Barbarigos, Landolf et al. Literature review on modeling and simulation of energy infrastructures from a resilience perspective [J]. | Reliability Engineering and System Safety , 2019 , 183 : 360-373 .
MLA Wang, Jing et al. "Literature review on modeling and simulation of energy infrastructures from a resilience perspective" . | Reliability Engineering and System Safety 183 (2019) : 360-373 .
APA Wang, Jing , Zuo, Wangda , Rhode-Barbarigos, Landolf , Lu, Xing , Wang, Jianhui , Lin, Yanling . Literature review on modeling and simulation of energy infrastructures from a resilience perspective . | Reliability Engineering and System Safety , 2019 , 183 , 360-373 .
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High impedance fault detection method based on improved complete ensemble empirical mode decomposition for DC distribution network EI SCIE
期刊论文 | 2019 , 107 , 538-556 | International Journal of Electrical Power and Energy Systems
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Abstract :

Aiming at DC distribution network, we proposed a novel high impedance fault detection method in the paper, it main procedures are as follows: Firstly, used the algorithm of complete ensemble empirical mode decomposition with adaptive noise (CEEMDAN) to extract the first intrinsic mode function (IMF) of the characteristic mode. Secondly, calculated the singular point of mutation and the cumulative slope by the acquisition of the first order difference operation, and then, achieved to distinguish the fault state and the normal state by the comparison between the slope and the starting threshold. Thirdly, identified the first IMF with Prony algorithm to obtain the parameters of characteristic frequency components (CFC) and direct current components (DC), and calculated the energy ratio between them, and then, distinguished small impedance fault (SIF), medium impedance fault (MIF), high impedance fault (HIF) and load switching (LS) by different values of energy ratio. A large number of experiments show that the proposed method is accurate and effective. Compared with other methods, this method shows its merits in feature extraction accuracy, detection accuracy and calculation speed. © 2018 Elsevier Ltd

Keyword :

Characteristic frequencies DC distribution network Ensemble empirical mode decomposition First order differences High impedance fault High impedance fault detection Intrinsic Mode functions Mode currents

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GB/T 7714 Wang, Xiaowei , Song, Guobing , Gao, Jie et al. High impedance fault detection method based on improved complete ensemble empirical mode decomposition for DC distribution network [J]. | International Journal of Electrical Power and Energy Systems , 2019 , 107 : 538-556 .
MLA Wang, Xiaowei et al. "High impedance fault detection method based on improved complete ensemble empirical mode decomposition for DC distribution network" . | International Journal of Electrical Power and Energy Systems 107 (2019) : 538-556 .
APA Wang, Xiaowei , Song, Guobing , Gao, Jie , Wei, Xiangxiang , Wei, Yanfang , Mostafa, Kheshti et al. High impedance fault detection method based on improved complete ensemble empirical mode decomposition for DC distribution network . | International Journal of Electrical Power and Energy Systems , 2019 , 107 , 538-556 .
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A Nonisolated Bidirectional Soft-Switching Power-Unit-Based DC-DC Converter With Unipolar and Bipolar Structure for DC Networks Interconnection EI SCIE CPCI-S Scopus
会议论文 | 2018 , 54 (3) , 2677-2689 | 31st Annual IEEE Applied Power Electronics Specialists Conference and Exposition (APEC)
WoS CC Cited Count: 2 SCOPUS Cited Count: 2
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Abstract :

In this paper, a novel nonisolated bidirectional soft-switching dc-dc converter based on series power units (PU-BDC) with unipolar and bipolar structure for dc networks interconnection is proposed. All semiconductor devices in the PU-BDC operate under soft-switching conditions in both directions with low voltage stress. By operating in the discontinuous conduction mode, all switches and diodes are turned ON naturally under zero current. By introducing an auxiliary zero-current-transition commutation cell in each power unit, zero current turn-OFF of all switches and diodes is achieved to reduce the turn-OFF loss. Besides, the PU-BDC has a transformerless structure with small volume and low cost, which makes it more suitable for small-scale or medium-scale dc networks and distributed generation systems. In addition, two types of bipolar PU-BDC are proposed to extend its application to bipolar dc networks interconnection. The control system was also optimized for grid-connection applications by providing an output voltage control strategy, a voltage gain control strategy, and a power control strategy to maintain the voltage level or keep a constant voltage gain of the networks and performing precise power control. Finally, simulations of a unipolar PU-BDC and a bipolar PU-BDC with three power units were implemented, and a 1.6-kW experimental prototype of the unipolar PU-BDC with three power units was developed to verify the effectiveness of the converter.

Keyword :

Bidirectional bipolar dc networks interconnection transformerless unipolar zero-current-transition (ZCT)

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GB/T 7714 Sun, Lejia , Zhuo, Fang , Wang, Feng et al. A Nonisolated Bidirectional Soft-Switching Power-Unit-Based DC-DC Converter With Unipolar and Bipolar Structure for DC Networks Interconnection [C] . 2018 : 2677-2689 .
MLA Sun, Lejia et al. "A Nonisolated Bidirectional Soft-Switching Power-Unit-Based DC-DC Converter With Unipolar and Bipolar Structure for DC Networks Interconnection" . (2018) : 2677-2689 .
APA Sun, Lejia , Zhuo, Fang , Wang, Feng , Zhu, Tianhua . A Nonisolated Bidirectional Soft-Switching Power-Unit-Based DC-DC Converter With Unipolar and Bipolar Structure for DC Networks Interconnection . (2018) : 2677-2689 .
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