Feng Shuanglei

Studies on the Variable Speed Wind Turbine Control System Based on PSCAD/EMTDC

A variable speed wind turbine (VSWT) based on Doubly Fed Induction Generator (DFIG) has some advantages and better integration characteristics comparing with fixed speed wind turbine. On the basis of existing models of main components of wind turbine in the model library of PSCAD/EMTDC, the control system of VSWT is established in this paper. Furthermore, taking a kind of prevailing wind turbine for an example, a simulation study was carried out. The results show that the performance of wind turbine using the developed control system can meet the technical requirements given by the wind turbine manufactures.

Study on energy loss calculation during wind power curtailment based on mast data

To assess the energy loss of wind farm during wind power curtailment accurately, a method to calculate wind power curtailment of a wind farm, which is called mast trend extrapolation, is proposed. Wind speed of mast nearby is used as input data in this method. Considering effects of wind farms area topography, roughness change and wake effect on local wind speed in the wind farm, this approach builds wind farm numerical model. By using theory of micro meteorology, mast wind speed is extrapolated to each turbine at hub height. The turbine power is available combining the theory power curve. Wind farm theory power is accumulated by each turbines theory power. And then wind power curtailment is available. From the essence of development and change of wind speed, the approach according to the actual characteristics of wind farm, through the data modeling, simulation calculate the actual flow of wind speed in wind farms. Applying both mast trend extrapolation method and general sample turbine method in wind power curtailment calculation of a wind farm, it shows that the calculation precision of mast trend extrapolation method is higher than sample turbine method, which can meet the requirement of engineering application.