He Jinghan

Transmission Efficiency Analysis and ANSYS Simulation of Catenary Tension Wheel

The relationship between tension wheel equipments transmission efficiency and angle changes is studied theoretically. Regarding the features of practical data, Solidworks 3D software is adopted to establish the tension wheel equipment model. Then such model is processed in ANSYS Workbench, and its Youngs modulus, density and other physical parameters are set. The relationship between the coefficient of friction and tension is analyzed by static simulation. The dynamic simulation results show the movement of tension wheel equipment with different outside load is discussed, as well as the relationship between transmission efficiency and tension. The simulation verifies the correctness of the model and provides a new approach for the analysis of the reliability and working conditions of the catenary tension wheel equipment.

An Optimal Combined SVM Model for Short-term Wind Speed Forecasting

A high precise wind speed forecasting method is one of current wind power research hotspots. This paper presented a combined wind speed forecasting model based on support vector machine (SVM) optimized by particle swarm optimization (PSO) using historical data of wind speed at the site. The model took the results of back propagation neural network (BPNN), radial basis function neural network (RBFNN), genetic neural network (GNN) and wavelet neural network (WNN) as the inputs, and adopted the actual wind speed as the output. Meanwhile, particle swarm optimization was used to optimize model parameters. Apply this model in hourly prediction of wind speed using historical data from a wind farm in Shanxi Province. It is observed that its prediction accuracy was not only higher than that of any of its single network but higher than traditional linear combined forecasting model and neural network combined forecasting model.

Fault analysis of distribution network with wind turbines of DFIG

With high penetrations of wind energy, different types of wind farm generators do not have the same fault transient characteristics that can complicate the selection and configuration of wind farm grid protection equipment. Incorrect selection of protection equipment will affect the stability and of the power systems. This paper investigates and analyzes the transient characteristics of doubly-fed induction generator (DFIG) under various short-circuit fault conditions for a typical distribution network. Firstly a detailed model of the DFIG and its principles is descried. A realistic of a 99 MW wind farm with 66 units of 1.5 MW DFIG is modeled using RTDS/RSCAD. The transient characteristic of the wind farm with the DFIG units have been analyzed under different short-circuit fault conditions. Results from the fault performance study on the distribution network are presented and discussed.