| How to maintain the rapid economic development on the basis of not destroying the environment has become an increasingly serious problem.More and more countries are paying attention to the development of renewable resources and to the environment.Protection,in which wind power generation is characterized by its reproducibility,small environmental pollution,and large electrical energy generation,has been rapidly developed and widely used.In the actual operation of the power system,large-scale wind power unit access may affect the low-frequency oscillation mode of the power system.When the number of wind power grid connection reaches a certain scale,the low frequency oscillation problem of the power system will affect the stability of the power grid and become a major factor restricting the integration of wind power into the grid and the power system output stable power supply.In recent years,research on the dynamic model of wind power generation system has always been the focus of people’s research.This paper sets up a simulation model that can easily study the impact of wind power on the low-frequency oscillation of the power system.Because the current application of more variable speed wind turbine is Doubly-fed wind power generation unit,therefore,this paper chooses doubly fed induction generator as a wind power grid-connected wind power generation unit to perform simulation.Because the control effect of double-fed fan is prominent,the mathematical modeling of its control system is the focus of research.The PI controller is selected as the converter control system of the DFIG.Through research,it is found that the excitation control parameters of the PI controller used in the converter control model also have a large impact on the stability of the system,so the excitation control The influence of parameters and control regulation is also an aspect of the research of this topic.For the low-frequency oscillation of the power system caused by grid-connected wind power,this paper adopts the method of adding damping controller to the control system.Through mathematical derivation and simulation analysis,it is proved that it can effectively suppress the low-frequency oscillation of the system.Based on the current important position of wind power generation in energy security and sustainable development,this paper establishes a stand-alone infinity system that includes a wind turbine as a model for analysis,and uses a double-fed fan as a wind turbine for analysis and simulation,and on this basis A specific solution to suppress low-frequency oscillations is proposed. |
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