Chang Xu

ORCID: 0000-0002-5952-8964
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About
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Research Areas
  • Wind Energy Research and Development
  • Wind and Air Flow Studies
  • Fluid Dynamics and Vibration Analysis
  • Wind Turbine Control Systems
  • Solar Thermal and Photovoltaic Systems
  • Advanced Sensor and Control Systems
  • Frequency Control in Power Systems
  • Iterative Learning Control Systems
  • Energy Load and Power Forecasting
  • Photovoltaic System Optimization Techniques
  • Aerodynamics and Fluid Dynamics Research
  • Icing and De-icing Technologies
  • Microgrid Control and Optimization
  • Solar Radiation and Photovoltaics
  • Advanced Algorithms and Applications
  • Teleoperation and Haptic Systems
  • Power Systems and Renewable Energy
  • Sensorless Control of Electric Motors
  • Solar-Powered Water Purification Methods
  • Micro and Nano Robotics
  • Heat and Mass Transfer in Porous Media
  • Neural Networks and Applications
  • Forest Biomass Utilization and Management
  • Elevator Systems and Control
  • Geophysics and Sensor Technology

Hohai University
2016-2025

NetEase (China)
2025

Nanjing University of Science and Technology
2023-2024

Massey University
2023-2024

Tongji University
2023-2024

Ministry of Industry and Information Technology
2024

Northwestern Polytechnic University
2024

Northwestern Polytechnical University
2024

Xinjiang University
2024

Northwest Institute of Nuclear Technology
2024

Interictal epileptiform discharge (IED) and its spatial distribution are critical for the diagnosis, classification, treatment of epilepsy. Existing publicly available datasets suffer from limitations such as insufficient data amount lack information. In this paper, we present a comprehensive EEG dataset containing annotated interictal epileptic 84 patients, each contributing 20 minutes continuous raw recordings, totaling 28 hours. IEDs states consciousness (wake/sleep) were meticulously by...

10.1038/s41597-025-04572-1 article EN cc-by-nc-nd Scientific Data 2025-02-07

In the marine environment, floating offshore wind turbines (FOWTs) are exposed to perturbations of nonlinear motion response. An in-depth study evolution laws wake vortex and deficit under six degrees freedom conditions in FOWTs can help reduce blade load enhance output for downstream turbines. This paper enhances traditional actuator line model by incorporating velocity corrections that account platform motion, enabling dynamic simulations National Renewable Energy Laboratory 5 MW...

10.1063/5.0246831 article EN Physics of Fluids 2025-01-01

The yaw state constitutes a typical operating condition for wind turbines. However, the widely used Blade Element Moment (BEM) theory, due to its adoption of planar disc assumptions, introduces certain computational inaccuracies in conditions. This research aims develop new modified BEM method by replacing momentum theory traditional with Madsen analytical linear two-dimensional actuator model order enhance accuracy calculating aerodynamic performance yawed Two approaches are introduced...

10.3390/en18051063 article EN cc-by Energies 2025-02-21

Load frequency regulation is an essential auxiliary service used in dealing with the challenge of stability power systems that utilize increasing proportion wind power. We investigate a load control method for multiarea interconnected integrated farms, aimed to eliminate deviation each area and tie-line between different areas. The explores derivative integral terminal sliding mode technology solve problem regulation. Such employs concept relative degrees. However, subsystems wind-integrated...

10.1109/jas.2022.105407 article EN IEEE/CAA Journal of Automatica Sinica 2022-01-29

On a wind farm, the wake has an important impact on performance of turbines. For example, upstream turbine affects blade load and output power downstream turbine. In this paper, modified actuator line model with tips, root loss, airfoil three-dimensional delayed stall was revised. This full-scale blades, nacelles, towers, combined Large Eddy Simulation, then applied validated based analysis wakes in farms. The verified using experimental Subsequently, numerical simulations were conducted two...

10.3390/en15010282 article EN cc-by Energies 2022-01-01

In recent years, a major focus on wind farm wake control is to maximise the production of farms. To improve power generation efficiency farms through regulation, this study investigates yaw optimisation for maximisation from perspective time-varying wakes. end, we first deduce simplified dynamic model according momentum conservation theory and backward difference method. The accuracy proposed verified by simulation comparisons. Then, time lag propagation its impact meandering analysed. On...

10.3390/en16093932 article EN cc-by Energies 2023-05-06

10.1016/j.jnca.2010.10.012 article EN Journal of Network and Computer Applications 2010-11-04

This paper investigates governor design by reduced-order sliding mode for a hydropower plant with an upstream surge tank. The governing system is made up of tunnel, tank, penstock, wicket gate and servomechanism, governor, hydro-turbine grid. Concerning the components system, their mathematic models are established. Then, these interconnected to simulate system. From viewpoint state space in modern control theory, partially observed, which challenges design. By introducing additional...

10.3390/en81212376 article EN cc-by Energies 2015-11-26

The atmospheric stability and ground topography play an important role in shaping wind-speed profiles. However, the commonly used power-law extrapolation method is usually applied, ignoring effects. In present work, a new based on classification proposed evaluated for flows over different types of terrain. uses wind shear exponent estimated conditions rather than its average value all conditions. Four methods, namely Richardson Gradient (RG) method, Wind Direction Standard Deviation (WDSD)...

10.3390/app8091429 article EN cc-by Applied Sciences 2018-08-22

In this paper, a trailing-edge flap is designed based on the wind turbine airfoil S809. The aerodynamic performance and flowfield of proposed are predicted by computational fluid dynamics (CFD) at angles attack from -5° to 12.5°. lift coefficient, drag pressure contour, streamline distribution analyzed then compared with those traditional flaps. results illustrate that coefficient lift-to-drag ratio markedly larger than flaps can effectively improve stall characteristics airfoil.

10.1088/1742-6596/1037/2/022020 article EN Journal of Physics Conference Series 2018-06-01

Abstract This paper investigates the characteristics of turbine wake which is major factor determining turbulence in wind farm and overall performance. Using lattice Boltzmann method (LBM) large eddy simulation (LES) approach, dynamic simulations detailed fluid flow trajectory induced by MEXICO were carried out. Moreover, with help adaptive mesh refinement (AMR) method, units allowed to be automatically refined allocate more grid points on solid walls region. The results firstly compared...

10.1002/we.2560 article EN cc-by-nc-nd Wind Energy 2020-08-10

This study aims to maintain the frequency stability of power system penetrated by wind power. Hence, a battery energy storage (BESS) is applied smooth output in systems and enhance their load control (LFC) capacity. A novel comprehensive framework proposed for integrated with farms BESS based on an adaptive fuzzy super-twisting sliding mode (AF-SSMC) method. Firstly, functions laws subsystems are designed according different relative degrees. Then, algorithm suppress chattering law....

10.3390/machines10121225 article EN cc-by Machines 2022-12-15

Compared with recirculation and injection modes, once-through direct steam generation (DSG) parabolic troughs are simpler to construct require the lowest investment. However, heat transfer fluid (HTF) in DSG trough systems has most complicated dynamic behavior, particularly during periods of moving shadows caused by small clouds jet contrails. In this paper, a nonlinear distributed parameter model (NDPDM) is proposed behavior solar collector row under shadow conditions. state-of-the-art...

10.1115/1.4036331 article EN Journal of Solar Energy Engineering 2017-03-28
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