A5043502663- Wind Energy Research and Development
- Wind and Air Flow Studies
- Aerodynamics and Fluid Dynamics Research
- Fluid Dynamics and Vibration Analysis
- Wind Turbine Control Systems
- Aerospace Engineering and Energy Systems
- Smart Grid and Power Systems
- Power Systems and Technologies
- High-Voltage Power Transmission Systems
- Combustion and Detonation Processes
- Energetic Materials and Combustion
- Multilevel Inverters and Converters
- Microgrid Control and Optimization
- Icing and De-icing Technologies
- Evaluation Methods in Various Fields
- Power Systems and Renewable Energy
- Ocean Waves and Remote Sensing
- Structural Response to Dynamic Loads
- Lightning and Electromagnetic Phenomena
- Advanced Decision-Making Techniques
- HVDC Systems and Fault Protection
North China Electric Power University
2021-2024
Shanghai Electric (China)
2024
China Electric Power Research Institute
2022
Atmospheric stability can significantly influence the spreading of wind-turbine wakes. The previous studies often coupled atmospheric with turbulence intensity and attributed to enhancement or suppression due buoyancy effect. In this study, we decouple ambient intensity, pure on turbine wakes is investigated at a certain hub-height via large-eddy simulation. We find that spanwise transport plays crucial role in wake recovery, influences by redistributing between three components altering...
Numerous wind farms are planned and built in the coastal or forest-to-grassland transition areas with abrupt rough-to-smooth surface roughness change. Behind change, atmospheric boundary layer (ABL) undergoes a complex process which brings big challenges to canonical wake models of turbines. To this end, we employ large eddy simulation (LES) investigate development ABL evolution wind-turbine wakes at different positions under abruption from rough smooth, propose novel analytical model. Due...
Abstract Hilly terrain can significantly change the flow characteristics of atmospheric boundary layer. However, effects hilly with different steepness on turbine wakes remain understudied. To this end, a wind is placed hilltop steepness, and spread wake investigated via large‐eddy simulation. Results show that, above gentle hills, deflects upward crest downward valley, while for steep in way. Through analysis transport mean kinetic energy, it be found that pressure term works mechanisms...
Pressure gradient over topography will significantly affect wind-farm flow. However, knowledge gaps still exist on how to superpose wind-turbine wakes in the flow analytical model account for this effect, leading systematic errors evaluating wake effects. To end, we derive an implicit momentum-conserving superposition method under pressure (PG-IMCM) based total momentum deficit equation, which is linearised by convection velocity introduced Zong & Porté-Agel ( J. Fluid Mech. , vol. 889,...
During faults in a distribution network, the output power of distributed generation (DG) may be uncertain.Moreover, currents sources are also affected by power, resulting uncertainties calculation short-circuit current at time fault.Additionally, impacts such around will increase with sources.Thus, it is very important to develop method for calculating while considering network.In this study, an affine arithmetic algorithm intervals networks fluctuations presented.The proposed includes two...
Abstract The wind‐turbine wake growth is crucial for assessment. At present, it can only be determined empirically, which the primary source of prediction errors in analytical model, and a physically‐based method urgently needed. Recently, plume model proposed width neutral boundary layer based on Taylor's diffusion theory. However, this not applicable high‐roughness strongly convective conditions, mainly related to fact that specified far point too close virtual origin. In condition, has...
The concentration distribution of urban air pollutants is closely related to people's health. As an important utilization form wind power, rooftop turbines have been widely used in cities. wake effect the will change flow behind buildings and then affect pollutant dispersion. To this end, dispersion building studied via computational fluid dynamics method. actuator disk model idealized cube are adopted turbine building, respectively. study shows that can reduce mass fraction near ground...
Abstract A large number of full-power inverter type new energy sources are connected to the power grid, resulting in a error traditional grid short-circuit calculation method. By analyzing relationship between output current and voltage at parallel point, two-stage short circuit method based on fitting source fault characteristics is proposed. In first stage, polynomial used. The piecewise function expression fitted into continuous derivative curve. second original characteristic...
When the streamwise scale of wind farm exceeds an order magnitude atmospheric boundary layer height, it becomes fully-developed farm, which is important theoretical model to study flow mechanisms large power plants. However, existing studies are only focused on regular layout, and influence layout characteristics, vertical structure, mean kinetic energy budget still not well understood. To this end, we utilize high-fidelity large-eddy simulation investigate with different turbine densities....