大容量多電平APF控制策略研究
[Abstract]:With the wide application of power electronic equipment, nonlinear load brings a large number of harmonics to the power system. Therefore, the control of harmonics has been widely concerned. Active power filter (APF) has attracted great attention because of its advantages of real-time and dynamic compensation for harmonics and reactive power. At present, active power filter (APF) has been well applied in the field of low voltage distribution system, but it is still immature in high voltage and large capacity situations. The main factor restricting its application is the contradiction between the switching frequency and the working voltage of the power device. The carrier phase shift modulation (CPS-SPWM) and H bridge concatenated topology introduced in this paper solve the above problems. In this paper, the development and topology of large capacity and multi-level technology are introduced systematically. Then the application of cascade H-bridge topology in APF is studied. The modulation technology CPS-SPWM of cascade H bridge and the working mode of cascade H bridge circuit are analyzed in detail. For the harmonic detection of APF, the instantaneous reactive power theory and its application in harmonic detection technology are briefly introduced. In the aspect of current tracking control, the compound control technology of PI repetitive control is analyzed, and the selection method of control parameters is given. At the same time, the selection of main circuit parameters of cascade H-bridge APF is also introduced in detail. Finally, the voltage balance on DC side, which is the key technology of cascade H-bridge APF, is analyzed and introduced. Starting with the energy flow relationship between DC side and power grid, the influence of voltage imbalance on the system is analyzed. Then the mechanism of voltage imbalance on the DC side of the cascade H bridge is derived by using the mathematical formula. Finally, the voltage balance between each module and phase is realized by hierarchical voltage control.
【學位授予單位】:合肥工業(yè)大學
【學位級別】:碩士
【學位授予年份】:2015
【分類號】:TM761;TN713.8
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