含風(fēng)力發(fā)電的電力系統(tǒng)頻率控制研究
[Abstract]:As the most promising and relatively mature clean power generation technology wind power generation technology has maintained a strong momentum of development in recent years which makes large-scale wind power grid operation become an inevitable trend. Wind power not only adapts to the adjustment strategy of energy structure in the world, but also puts forward more challenging requirements to its related technical fields. Based on the research of traditional wind power generation technology, this paper focuses on the frequency fluctuation of power system caused by large-scale wind power grid connection, and takes the power system with wind power generation as the object to carry out the research on the related frequency control strategy. Firstly, the related theories of frequency control of traditional power system are analyzed, and then the basic theory of wind power generation and the type of wind turbine are analyzed, and the main structure and operation characteristics of doubly-fed asynchronous wind turbine are introduced in detail. The mathematical models (motion equation and load model, prime mover model, governor model, doubly-fed wind turbine model, etc.) are built and implemented by MATLAB/Simulink simulation software. Secondly, on the basis of the above established model, the operating characteristics of wind turbine in different wind conditions are analyzed and introduced, and the simulation of wind power frequency control system is carried out according to the frequency control methods that usually exist in wind power system. The working conditions and control effects of each frequency control method are compared and analyzed, as well as the power variation and stability of the system under different operating conditions. Finally, through the virtual inertia control and the introduction of FM power value into the governor control, the doubly-fed unit can respond to the frequency change of the power system, and then cooperate with the maximum power tracking control of the wind turbine and the pitch control. Thus, the same type wind farm composed of variable speed fan can support the frequency of power system. Finally, the feasibility and effectiveness of this control strategy for improving the stability of wind power generation and reducing the influence on system frequency are verified by MATLAB/Simulink simulation software.
【學(xué)位授予單位】:上海電機(jī)學(xué)院
【學(xué)位級別】:碩士
【學(xué)位授予年份】:2017
【分類號】:TM712
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