變速恒頻風(fēng)力發(fā)電系統(tǒng)中雙PWM變換器容錯(cuò)控制
[Abstract]:Energy is one of the most important strategic issues in social development today and is the lifeblood of the sustainable development of social productive forces. As a result, energy saving and emission reduction and new energy technology development have become an important policy in China's economic life. As an inexhaustible renewable clean energy, wind energy has the characteristics of no pollution and wide distribution. The clean and sustainable development of new energy power generation technology, especially the wind power generation, which has the most scale and commercial development prospects, has become the research hotspot of energy systems all over the world. The doubly-fed wind turbine can keep the maximum wind energy capture according to the different wind conditions, and as a partial power converter (30%), its main characteristics are lower cost than other fans, so it has become the most widely used in the world today. A wind turbine. In this paper, the most typical doubly fed wind turbine (DFIG) is selected as the research object, and its operating principle is discussed. The modeling and control analysis of DFIG and its dual PWM converter is carried out. This paper mainly studies the following aspects: 1, introduces the principle of wind power capture, describes the control function of double PWM converter in DFIG in detail, and deduces the three-phase static abc coordinate system in detail. The mathematical model of DFIG and its double PWM converters in synchronous rotating dq coordinate system is presented. Then the decoupling scheme is given for the mathematical models of double PWM converters after coordinate transformation. The vector control techniques of grid-side PWM converters and machine-side converters are discussed. Finally, the simulation research is given. The MPC can deal with a large number of physical constraints in double PWM converters. The application of MPC in double PWM converter is discussed. However, the dual PWM converter system still has the characteristics of nonlinearity after coordinate transformation, and the processing of linear processing is discussed. Then the linear MPC is designed to control the rotor side PWM converter effectively. It is difficult to be applied in electromechanical system because of the large amount of real-time operation in MPC. This paper introduces the principle of explicit Predictive Control (Explict-MPC) and discusses the application of EMPC in grid-side PWM converters. Finally, it is verified by simulation. Finally, the influence and harm of power grid imbalance on DFIG system are introduced. The power mathematical model of grid-side converter under asymmetrical fault of power network is analyzed and deduced emphatically. Combined with the control target of grid-side PWM converter, the control strategies of positive and negative sequence double dq axis and double PI are designed. At the same time, aiming at the premise that accurate separation of positive and negative sequence components is the premise of the proposed method, the methods of extracting their components based on notch filter and time delay method are designed, and their respective advantages and disadvantages are briefly described. Finally, the algorithm is simulated and verified.
【學(xué)位授予單位】:北方工業(yè)大學(xué)
【學(xué)位級(jí)別】:碩士
【學(xué)位授予年份】:2017
【分類號(hào)】:TM614;TM46
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