Analysis And Simulation On Wind Power System Connected With Grid Of Poyang Lake

The wind power as a kind of renewable green power resources has obtained considerable development, and has received extensive attention in recent years. As the wind is characterized by randomness and intermittent occurrences, the wind electricity is becoming more and more important to the grid stability with the enlargement of the scale of wind farms, which has become the restriction for the development of wind farm construction. Therefore a thorough analysis of the influence which the wind farm and the grid incorporate becomes inevitable.Taking the double-fed wind power generation system as the object of study, this thesis focuses on the mutual influence between wind farm and the grid, specially the influence on the stability of the system. Based on the MATLAB simulation platform, and the actual situation in Poyang Lake area, the author has carried on an analysis on the stability of the laoyemiao wind farm production incorporation movement. This will have the vital practical significance to the movement of the next wind farm construction. The activities which have been taken are as follows:First, according to collected data, we carry the analysis on the wind resources by using the wind resources evaluation method , and conclude that "it may be appled in the incorporation wind power generation". Besides we also analyze the nearby grid situation and the load forecast and the development plan and so on to provide premise for later wind farm production incorporation movement.Next, we have established stable state mathematical model of double-fed wind power generation system, and on the basis of this established the power system flow calculation. We have applied the method in which asynchronous generator stable state mathematical model and the conventional tidal power flow equation iterate in turn to the tidal power flow in the actual grid. We have analyzed how the wind farm turning on system could change situation of the system tidal current and the net, and have provided the prerequisite for the study of dynamic characteristics of the wind farm incorporation movement.Once more, we use the software platform of MATLAB/Simulink, establishing double-fed wind unit numeral simulation module on the basis of the established mathematical model. Simulating the actual wind, we have done a research to the movement of the wind farm incorporation combined by 66 wind electrical machineries.Finally, taking into consideration the Jiangxi Province wind power generation project, we have anticipated wind farm situation in 2010 in the Jiujiang, and have analyzed the system stability after the Jiujiang grid were merged into a wind farm with certain capacity and the infuence to the electrical energy quality. Through applying the MATLAB/Simulink software, we have realized the power system dynamic simulation with wind farm.The simulation simulated dynamic stability of Jiujiang grid after the operation of the wind farm and the influence wind disturbance on system running out of and the wind farm. Our conclusion is that because the double-fed wind-driven generator has perfect control system and good input level, the influence which the laoyemiao wind farm incorporation to the grid would be very small, the guarantee system transition condition would also be stable.