Study On The Stable Operation Of Laiwu Power System By Wind Power Grid Connection

Energy is the foundation of economic and technological development.In the face of the decline of non-renewable energy,the rapid development of new energy has become an inevitable result.As a kind of clean energy,wind power technology has been developed rapidl,However,in wind power generation technology,doubly-fed motor is often used as generator,and doubly-fed fan is a strongly coupled,multi-variable nonlinear control system,Therefore,the grid-connected device of its power generation is bound to consume a large number of non-functional energy in the grid,and the instability of peripheral wind speed will cause its output voltage instability,etc.All of the above factors will cause damage to the power equipment,so putting forward reasonable solutions has become a research focus.At first,the basic working principle of the three-phase static coordinate system and the two-phase rotating coordinate system is analyzed,and the control strategy of the double-fed fan based on magnetic field orientation is studied.The main control mode is that the double-fed wind power system usually USES the back-to-back converter to provide ac excitation to the rotor winding.The grid side converter can adjust the power factor of the whole double-fed wind power generation system.Secondly,the voltage,current,frequency and other influencing factors and principles of the power system are analyzed through wind power grid-connection,At the same time,it summarizes the factors of deviation of frequency and voltage caused by external disturbance,and puts forward corresponding solutions.Then,the solution of adding reactive compensation device and low voltage crossing is proposed for the unstable operation of power system caused by wind power grid-connection.The control principle is introduced first,and the control method is summarized and analyzed.Finally,MTLAB software platform is used to verify the control method,1)the influence of the double-fed fan grid-connection on the power grid is simulated under different working conditions of gust,random,gradual and constant wind speed.2)verify and summarize the stability of power grid voltage and current after adding reactive power compensation device.3)verify and summarize the stability of power grid voltage and current after adding low voltage crossing device.Conclusion:the influence of the above two control methods on the voltage and current caused by the grid-connection of the fan is weakened,which further verifies the reliability and authenticity of the theory.