A5067386077- Multilevel Inverters and Converters
- Microgrid Control and Optimization
- Advanced DC-DC Converters
- Silicon Carbide Semiconductor Technologies
- Power Systems and Renewable Energy
- Islanding Detection in Power Systems
- Solid State Laser Technologies
- Plasmonic and Surface Plasmon Research
- HVDC Systems and Fault Protection
- Advanced Battery Technologies Research
- Photorefractive and Nonlinear Optics
- Optical Coatings and Gratings
- Luminescence Properties of Advanced Materials
- High-Voltage Power Transmission Systems
- Photovoltaic System Optimization Techniques
- Metamaterials and Metasurfaces Applications
- Smart Grid Energy Management
- Generative Adversarial Networks and Image Synthesis
- Neural Networks Stability and Synchronization
- Supercapacitor Materials and Fabrication
- Near-Field Optical Microscopy
- Crystallization and Solubility Studies
- Pulsars and Gravitational Waves Research
- Frequency Control in Power Systems
- Computer Graphics and Visualization Techniques
Shandong University
2016-2025
Chinese Academy of Sciences
2006-2009
Academia Sinica
2008
Institute of Optics and Electronics, Chinese Academy of Sciences
2007
Shenzhen University
2004
State Key Laboratory of Crystal Materials
2001-2002
Paul Scherrer Institute
1990
A silver film-based superlens, a plasmonic microzone plate, is put forth for the purpose of superfocusing at visible regime. The numerical analysis results reveal that it has unique focusing characteristics longer focal length and depth focus with resolving power beyond diffraction limit in comparison to conventional zone plates. Working near field, increases working distance l field from l<λ∕10 l≈λ∼5λ. This feature makes promising superlens be used as probe optical systems high...
In this paper, a new modulation method is proposed for Z-source three-level T-type inverter (3LT <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> I). The 3LT I combines the merits of two-level and advantages neutral-point-clamped inverter. Although previous literature has proved that space vector (SVM) technique produces desired voltage transfer gain with minimized switching loss, it cannot deal neutral-point (NP) potential balance issue....
The Vienna rectifier is an attractive topology for industrial applications. In order to obtain fixed switching frequency (FSF) while maintaining lower current distortion, improved model predictive control (MPC) method using optimized voltage vectors and sequences proposed in this article. First, the space vector diagram of divided into six sectors according input currents. Then finite-set MPC (FS-MPC), sector can be further subsectors, which reduces number candidate from 19 7 simultaneously....
Paralleled inverters have the merits of high power rating, improved reliability, and convenient maintenance. However, zero-sequence circulating current (ZSCC) will occur lead to distortion system loss. The ZSCC control is more complicated when three-level topology utilized paralleled number increased. Therefore, this paper proposes a simplified suppression scheme for multi-paralleled T-type (3LT <sup xmlns:mml="http://www.w3.org/1998/Math/MathML"...
Since the high efficiency and low cost of single-stage power conversion, dual-dc-port dc-ac converters have been used in photovoltaic (PV)-battery hybrid systems. However, achieving leakage current suppression this configuration is challenging due to its coupling characteristics terms common mode voltage (CMV) reduction distribution. To deal with issue, a method using unbalanced large, medium, small vector modulation (ULMSVM) CMV transition proposed paper. Firstly, vectors calculated sorted...
With the rapid advancements in diffusion models and 3D generation techniques, dynamic content has become a crucial research area. However, achieving high-fidelity 4D (dynamic 3D) with strong spatial-temporal consistency remains challenging task. Inspired by recent findings that pretrained features capture rich correspondences, we propose FB-4D, novel framework integrates Feature Bank mechanism to enhance both spatial temporal generated frames. In store extracted from previous frames fuse...
The five-level active neutral-point-clamped (5L-ANPC) inverter has been applied to increase the power capacity of photovoltaic (PV) systems. However, this type configuration requires balance neutral point (NP) voltage and flying capacitor (FC) properly. For operation transformerless inverter, another requirement is suppress leakage current associated with common-mode (CMV) vectors. Due mutually coupled issues, conventional model predictive control (MPC) methods reported so far cannot deal...
In this paper, the Z-source three-level T-type converter (3LT2C) is proposed for low-voltage applications. The 3LT2C basically combines positive aspects of Zsource two-level with advantages neutral point clamped (NPC) converter. traditional space vector modulation (SVM) technique produces desired voltage transfer gain minimized switching loss, but cannot deal neutral-point potential (NP) balance issue. Therefore, an improved SVM method considering coupling problem proposed. simplifies...
To reduce the current stress and switching losses of dual active bridge (DAB) DC-DC converter, this paper proposes an optimized modulation scheme based on triple-phase-shift (TPS) control. Above all, a comprehensive analysis operation modes is given. The transmission power model, as well zero-voltage-switching (ZVS) conditions are obtained by analyzing waveforms soft-switching restrictions in each mode. On basis, presented to enable converter operate minimum-current-stress condition while...
A high-frequency link matrix converter (HFLMC) has been increasingly used in power conversion for its distinct advantages of high efficiency and compact volume. However, the conventional six-segment space vector PWM (SVPWM) scheme leads to current ripple on dc side distortion ac side, which can inevitably destroy battery load decrease quality. This article proposes a modified SVPWM with dwell time sequence compensation (MC-SVPWM) reduce under modulation index conditions. The proposed...
The modular multilevel converter (MMC) is considered to be the state of art in medium- and high-voltage application. nearest level modulation (NLM) method one most popular modulations, however, when applied MMC with small number sub-modular (SM), output waveforms contain large harmonic components. This paper proposes a modified NLM method. By changing traditional rounding function suppress harmonics voltage without obviously capacitor voltages switching frequency power devices. Besides,...
Using a large sample of fast radio bursts (FRBs) from the first CHIME/FRB catalog, we apply Lynden-Bell's c$^-$ method to study their energy function and formation rate evolutions with redshift. It is found non-parametric Kendell's $\tau$ statistics that FRB strongly evolves cosmological redshift as $E(z)\propto(1 + z)^{5.23}$. After removing dependence, local distribution can be described by broken power-law form $\Psi(E_{0})\propto E_{0}^{-0.38}$ for low-energy segment E_{0}^{-2.01}$...
Energy management is the core of economical and efficient operation for hybrid AC/DC microgrid. In this paper, renewable energy sources are forecast by using BP neural network based on modified particle swarm optimization (MPSO-BP). Compared with traditional algorithm, algorithm performs better in both search ability speed. After forecasting, objectives minimum total cost power loss, optimal model built. The output optimized through coordinating all kinds DGs. simulation results verified...
The voltage droop control technology is commonly adopted to the power sharing between parallel energy storage units in island dc microgrid for its low cost on and communication system, but a large number of current sensors are needed traditional method. An improved method reducing proposed. To achieve control, transferred by converters analyzed calculated without detecting output current, then, function converter input/output variables which proportional controller. Verification results...
This paper gives a detailed analysis about the causes of voltage distortion caused by dead time in dual active bridge (DAB) DC-DC converter. The zero-crossing point equivalent leakage inductor's current is definitive factor for various phenomena, which determined and phase-shift ratios. Based on switching characterization DAB dual-phase-shift scheme, comprehensive summary dead-time effect acquired, including polarity reversal, sag duty-cycle abnormity. At same time, these phenomena are...
Selective harmonic elimination pulse-width modulation (SHEPWM) is a well-known switching technique applied in power electronics field for eliminating low order harmonics. According to symmetrical pulse patterns over the quarter of period SHEPWM, neutral-point voltage could be balance naturally certain range. However, fluctuation would enlarging as output current increases. In addition, when unbalanced seriously, it cost much time recover on classical SHEPWM modulation. Therefore, novel...
This paper presents a predictive current control strategy with active damping method applied to source inverter. uses discrete-time model of the system predict future value grid for all possible vectors generated by According cost function that minimizes errors predicted and reference current, vector at next sampling time is determined. To suppress LC resonance in inverter, using virtual harmonic resistor adopted. The performance proposed compared conventional trilogic pulse width modulation...
Neutral-point (NP) voltage and flying capacitor (FC) balance, power loss reduction are important guarantees for the stable high-efficiency operation of single-phase five-level active neutral-point clamped (5L-ANPC) converters. However, little reports about balancing with have been proposed 5L-ANPC In order to obtain above merits, an improved discontinuous pulsewidth modulation (DPWM) method balance is proposed. First, optimized common-mode injected into waves decrease switching in each...
Parallel three-level T-type inverters (3LT <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> Is) can increase power rating and reliability, but the circulating current problem will arise. Unbalanced conditions including unbalanced filter inductances grid voltage have negative effects on operation of parallel 3LT Is. This paper presents an improved repetitive control scheme for suppression in Is under conditions. An average model dq0...