Model And Control Of Wind Power System Based On Virtual Synchronous Generator Technology

In recent years,the development of wind power industry in China becomes fiercer and fiercer,at the same time the technology of wind power is more and more sophisticated.With the increase of installed capacity of wind power,it poses new demands and challenges for power systems.The wind power system based on doubly fed induction generator(DFIG)has become a hotspot in recent years with the advantage of unique feature.With the increase of the proportion of wind power in the new energy,coupled with the large capacity of wind turbines linked to large power grids,the support of power grid has been weaken and the negative impacts to the stability of the power grid can not be ignored.With the rapid increase of clean energy,the technology has become one of the research focuses with many advantages,such as integration advantages,technology improvement and grid safety advantages,which atracts the attention of domestic and foreign researchers.First of all,it briefly introduces the development of wind power at home and abroad,and expounds the importance of wind power simulation research.Then,analyze the the structural characteristics of the doubly-fed induction generator and the method of establishing the mathematical model,which adopts the method of coordinate transformation to eliminate the complex inductance matrix and simplify the operation.Furthermore,propose the control measures in the generator side and in the grid side,which is very different.In the generator side,use the transformation control technology based on fixed magnetic field,to independently adjust the active power and reactive power of doubly-fed induction generator and then control the speed of the rotor,finally achieve the maximum wind energy tracking objectives.In the grid side,establish its mathematical model,and introduce virtual synchronous machine control algorithm,providing inertial support and voltage support for the wind power system and maintaining the stability of DC side voltage,finanlly achieve the default control target.In the end,build the model in the MATLAB power system software,set the wind speed conditionandstudy the wind power system side and the grid side adjustment process,to vertfy the reliability and accuracy of the proposed control measures.