雙饋式風(fēng)電機(jī)組建模及低電壓穿越技術(shù)研究
[Abstract]:In recent years, wind power is still developing rapidly and the installed capacity is increasing. Wind power has become an important part of energy structure in China. The stable operation of wind power grid and the ability to deal with power grid faults are urgent problems to be solved. This paper focuses on the needs of converter protection during the fault period of power grid. The main research work is as follows: the mathematical models of wind turbine, transmission chain, generator and converter are established. The model of doubly-fed machine and converter is analyzed in detail. According to the method of coordinate transformation, the mathematical model of two-phase rotating coordinate system is derived, which lays a foundation for the design and simulation of subsequent control strategy. The converter control strategy of doubly-fed wind turbine is analyzed, the corresponding controller model is established, and the variation of wind turbine parameters during the fault period of power grid is simulated and analyzed. On the basis of traditional control strategy, the influence of stator excitation current variation on transient operation characteristics of doubly-fed wind turbine is analyzed, and the applicability of the improved control under different fault depth is analyzed. The simulation results show that this control method has certain effect on restraining overcurrent, but it has some limitations in the case of deep power network fault. According to the existing research, a detailed model of super capacitor overvoltage protection circuit is established, and the charge-discharge characteristics and over-voltage protection ability of the circuit are simulated and analyzed. The simulation results show that the super capacitor protection circuit has good charge-discharge characteristics and can restrain DC bus voltage fluctuation and provide overvoltage protection for DC busbar during low voltage fault. In addition, the method of estimating the capacitance of super capacitor and line inductance is summarized, and the influence of inductor parameters on charge-discharge current is analyzed, which provides some guidance for equipment selection.
【學(xué)位授予單位】:華北電力大學(xué)(北京)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM315
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