A5100352791- Multilevel Inverters and Converters
- Advanced DC-DC Converters
- Microgrid Control and Optimization
- Silicon Carbide Semiconductor Technologies
- Silicon and Solar Cell Technologies
- Semiconductor materials and interfaces
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- HVDC Systems and Fault Protection
- Semiconductor materials and devices
- Thin-Film Transistor Technologies
- Wind Turbine Control Systems
- Neural Networks Stability and Synchronization
- Power Systems and Renewable Energy
- Photonic Crystal and Fiber Optics
- Advanced Fiber Laser Technologies
- Optimal Power Flow Distribution
- Advanced Memory and Neural Computing
- stochastic dynamics and bifurcation
- Combustion and Detonation Processes
- Technology and Security Systems
- Nanowire Synthesis and Applications
- Plant Surface Properties and Treatments
- Photovoltaic System Optimization Techniques
- Photonic and Optical Devices
Soochow University
2022-2024
Nankai University
2024
China University of Mining and Technology
2023
Inner Mongolia Electric Power (China)
2020-2021
Dalian Maritime University
2020
Nuclear and Radiation Safety Center
2017-2019
Tianjin University of Commerce
2018
Yanshan University
2015-2017
Harbin Institute of Technology
2016
Xi'an Jiaotong University
2012-2015
The fabrication of electronic circuits on unconventional substrates largely broadens their application areas. For example, green electronics achieved through utilization biodegradable or recyclable substrates, can mitigate the solid waste problems that arise at end lifespan. Here, we combine screen-printing, high precision laser drilling and thermal evaporation, to fabricate organic field effect transistor (OFET) active-matrix (AM) arrays onto standard printer paper. devices show a mobility...
Compared with conventional power transformer, the electronic transformer (PET) or solid-state has many attractive additional features. This paper focuses on an H-bridge-based three-phase three-stage modular PET, which consists of input stage series-connected H-bridge converters, isolation several independent dual-active-bridge and output parallel-connected converters. PET suffers dc-link capacitor voltage unbalancing issue, module current sharing issue. In this paper, a system control...
Advanced doped-silicon-layer-based passivating contacts have boosted the power conversion efficiency (PCE) of single-junction crystalline silicon (c-Si) solar cells to over 26%. However, inevitable parasitic light absorption doped layers impedes further PCE improvement. To this end, alternative based on wide-bandgap metal compounds (so-called dopant-free (DFPCs)) attracted great attention, thanks their potential merits in terms loss, ease-of-deposition, and cost. Intensive research activity...
Abstract Extensive research has focused on developing wide‐bandgap metal compound‐based passivating contacts as alternatives to conventional doped‐silicon‐layer‐based mitigate parasitic absorption losses in crystalline silicon (c‐Si) solar cells. Herein, thermally‐evaporated aluminum halides (AlX)‐based electron‐selective for c‐Si cells are investigated. A low contact resistivity of 60.5 and 38.4 mΩ cm 2 is obtained the AlCl x /n‐type (n‐Si) AlF /n‐Si heterocontacts, respectively, thanks...
Due to the unequal solar radiations or dust accumulation of photovoltaic modules in a single-phase cascaded H-bridge inverter, unbalanced output power among will make H-bridges with higher overmodulation, resulting deteriorated grid current. Concerning this issue, paper proposes an optimized third harmonic compensation strategy that injects moderate amount into overmodulation keep amplitudes their modulation waveforms just being unity, then compensates same opposite sequence and properly...
Abstract High‐efficiency silicon solar cells featuring doped layer‐based carrier‐selective contacts suffer from optical losses due to parasitic absorption. In this work, a high‐performance electron‐selective contact with high transparency is presented, consisting of intrinsic hydrogenated amorphous (a‐Si:H) passivation layer, atomic‐layer‐deposited conductive magnesium oxide (MgO x ) and low‐work‐function aluminium zinc (AZO). The a‐Si:H/MgO /AZO stack demonstrated be an excellent...
Soliton microcombs (SMCs) are spontaneously formed in a coherently pumped high-quality microresonator, which provides new tool for use as an on-chip frequency comb applications of high-precision metrology and spectroscopy. However, generation SMCs seriously relies on advanced experimental techniques from professional scientists. Here, we experimentally demonstrate program-controlled single SMC source where the intracavity thermal effect is timely balanced using auxiliary laser during...
Cascaded H-bridge (CHB) inverter has the advantages of easy modularization, low harmonic content output current, and that all power units are capable achieving independent maximum point tracking (MPPT). However, aging or partial shielding photovoltaic (PV) panels will lead to unbalanced each PV module, which result in overmodulation H-bridges increased components grid current. In this article, a novel compensation strategy for single-phase CHB is proposed, it can extend linear modulation...
Extensive efforts have been made to develop wide‐bandgap metal compound‐based carrier‐selective contacts improve the performance of crystalline silicon (c‐Si) solar cells, by mitigating deleterious effects metal–Si contact directly. Herein, thermally evaporated strontium oxide (SrO x ) is exploited as an electron‐selective for c‐Si cells. Benefiting from a lower work function (3.1 eV) SrO , strong downward band‐bending achieved at n‐type c‐Si/SrO interface, enabling transport characteristic....
Abstract The presence of a high density defects at the perovskite/electron transport layer (ETL) interface results in significant nonradiative recombination losses, thus impeding efficiency enhancement perovskite/silicon tandem solar cells (TSCs). In this investigation, metallocene‐based molecule, cobalt (III) dichlorophene hexafluorophosphate (CcPF 6 ), is employed for perovskite surface passivation. To maximize its efficacy, molecule dissolved mixed solvent acetonitrile and chlorobenzene,...
Efficient and stable organic-silicon heterojunction solar cells are highly desirable. In this work, solution-processed poly(3,4-ethylenedioxythiophene): perfluorinated sulfonic acid (PEDOT:F) is investigated as hole-selective contact for crystalline silicon (c-Si) cells....
Abstract Wide‐bandgap metal compound‐based dopant‐free passivating contacts have been explored to fabricate crystalline silicon (Si) solar cells mitigate the high carrier recombination rate of metal‐Si contact directly. Here, an over 4‐nm‐thick single‐layer strontium fluoride (SrF x ) and a double‐layer SrF /lithium (LiF) films deposited by facile vacuum thermal evaporation are developed act as high‐performance electron‐selective contacts. with ultra‐low work function (2.8 eV) induces strong...
For single-phase cascaded H-bridge (CHB) photovoltaic (PV) inverters, all the PV modules are able to operate at maximum power point, which is beneficial energy harvesting. However, due stochastically variable irradiance level and ambient temperature, unbalanced output powers among may cause overmodulation of H-bridges with higher power, ultimately resulting in a distorted grid current. In this paper, novel harmonic compensation strategy proposed. Compared existing methods, it can not only...
Featured with the advantages of expandable modular structure, simple layout, and low dependence on copper steel, three-phase solid-state transformer-based cascaded H-bridge (HB) topology has been replacing traditional inverters in high-voltage high-power photovoltaic power generation applications. However, due to double line-frequency fluctuation dc side HB converters, if LLC is used as front-stage isolated dc/dc converter, its resonant current will produce an envelope ripple same frequency....
Three-phase photovoltaic (PV) solid-state transformer based on cascaded H-bridge topology has a considerable prospect in high-voltage and high-power applications. Normally, each phase of the three-phase converter is designed to have same number modules, which composed an isolated dc–dc cascade with HB, all modules are able transmit active power. However, if partial fail, actual operation three phases may be different, resulting powers fault higher than those normal phase. The unbalanced...
Power Electronic Transformer (PET) is one of the key elements for future power electronics based supply systems, especially in renewable energy field. In this paper, a series new three-stage three-phase cascaded modular topologies comprising distinct AC-DC, DC-DC and DC-AC stages large rating PET are proposed. Comparisons these on efficiency, cost, redundancy, control characteristics supported functionalities, performed. According to comparison, it has been concluded that most suitable PET.
Self-healing bituminous material has been a hot research topic in self-healing materials, and this smart approach is promising revolution pavement technology. Bitumen naturality relating to temperature, healing time, aging degree. To date, heat induction microencapsulation rejuvenator are two feasible approaches, which have put into real applications. However, both methods disadvantages limiting their practical results efficiency. It will be an ideal method combining the advantages avoiding...
A novel design of a gold-coated photonic-crystal fiber (PCF) is studied by using the finite element method. The cross-section structure PCF composed square lattice air holes in which two are gold coated, and air-hole layout modified. resonance strength impact structural parameters on polarization filter characteristics studied. Numerical results show that wavelengths different polarized directions. strengths we obtain can reach value 720 dB/cm at wavelength 1.31 μm. When length 400 μm,...
To solve the voltage stability problem of electric vehicles connected to distribution network in limit state, a reactive power compensation strategy based on holomorphic embedding method and electrical distance is proposed. Firstly, load model vehicle charging station constructed, certain bus obtained. Then, flow equation system constructed by method, analytical expression rational function introduced Padé approximation algorithm. The collapse point solved zeros poles function. control...
This paper compares the unbalanced load correction capacity between four different PET topologies: SPC modular topology, CPC self-balancing topology and a proposed MAB based topology. The theoretical analysis show that can only achieve compensation within limited range both of them require additional power rating semiconductor devices to compensation. full-range without requiring devices, but they number transformers devices. Simulation results verifies methods their limitation all these...
Doubly-fed wind generator is highly sensitive to voltage variations of the grid, which poses limitations for power plants during grid integrated operation. This paper proposes a new control strategy rotor side converter doubly-fed induction (DFIG) using energy-based method based on Port-Control Hamiltonian (PCH) theory and L <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> disturbance attenuation. The proposed ride-through approach limits...