本文選題：定子雙繞組異步發(fā)電機 + 虛擬同步發(fā)電機��； 參考：《江蘇大學》2017年碩士論文

【摘要】：隨著能源短缺與環(huán)境保護問題的日益突出,極大地推動了風力發(fā)電的發(fā)展。用于風力發(fā)電的定子雙繞組異步發(fā)電機具有結構簡單、無刷、可靠性高等特點而被受到廣泛關注。采用虛擬同步發(fā)電機控制技術的并網逆變器與電網相連,可提高定子雙繞組異步發(fā)電機系統(tǒng)的并網友好性。隨著風電系統(tǒng)的滲透力越來越高,風電并網系統(tǒng)必須具備低電壓穿越的能力。論文以基于虛擬同步發(fā)電機的定子雙繞組異步發(fā)電機并網和低電壓穿越為研究對象,主要包括以下內容:首先,建立定子雙繞組異步發(fā)電機并網系統(tǒng)前級的數(shù)學模型。在對控制繞組電流解耦的基礎上,采用電壓外環(huán)、電流內環(huán)的雙閉環(huán)控制策略,保證了發(fā)電機輸出電壓的穩(wěn)定性。然后,建立定子雙繞組異步發(fā)電機并網系統(tǒng)后級的數(shù)學模型,建立起有功功率、無功功率與頻率、相角、電壓幅值之間的關系,通過預同步控制策略實現(xiàn)虛擬同步發(fā)電機的平滑并網。在采用虛擬同步發(fā)電機控制技術并網的基礎上,建立電網故障下逆變器的數(shù)學模型,通過對電網故障過程進行分析,提出基于PR電流控制器的算法,與虛擬同步發(fā)電機的控制算法的切換,從而實現(xiàn)電網故障下虛擬同步發(fā)電機的低電壓穿越,通過仿真驗證了電網故障下PR電流控制器的可行性和正確性。在電網故障發(fā)生時刻,采用切換控制算法來限制并網電流,并向電網提供無功功率,通過相角的同步實現(xiàn)正常狀態(tài)變成故障狀態(tài)的平滑切換。另一方面,電網由故障狀態(tài)變成正常狀態(tài),待電網故障結束后50ms至200ms之內可直接進行兩個模式的切換,使系統(tǒng)運行于正常并網的控制算法。通過仿真驗證了虛擬同步發(fā)電機的低電壓穿越控制策略的可行性和穩(wěn)定性。設計了定子雙繞組異步發(fā)電機系統(tǒng)的硬件和軟件。硬件上完成了功率器件的選型、控制側濾波電感的設計、直流側電容的和勵磁電容的設計,并對發(fā)電機側控制電路的關鍵參數(shù)進行分析。軟件上完成了程序的初始化、電壓和電流的采樣、數(shù)據(jù)的定標與一階慣性濾波、定向角度求取、坐標變換、電流滯環(huán)比較等。最后,通過一臺原動機代替風力機拖動發(fā)電機運行,采用電壓外環(huán)、電流內環(huán)的雙閉環(huán)系統(tǒng),實現(xiàn)了定子雙繞組異步發(fā)電機系統(tǒng)的發(fā)電。
[Abstract]:With the energy shortage and environmental protection problems becoming increasingly prominent, the development of wind power generation has been greatly promoted. The stator double winding asynchronous generator used in wind power generation is widely concerned because of its simple structure, brushless structure and high reliability. The grid-connected inverter with virtual synchronous generator control technology is connected to the power grid, which can improve the grid-friendliness of the stator double-winding asynchronous generator system. With the increasing permeability of wind power system, wind power grid connection system must have the ability of low voltage traversing. In this paper, the stator double winding asynchronous generator based on virtual synchronous generator and low voltage traversing are taken as the research object. The main contents are as follows: firstly, the mathematical model of the stator double winding asynchronous generator grid-connected system is established. On the basis of decoupling the control winding current, the output voltage stability of the generator is ensured by using the double closed loop control strategy of the voltage outer loop and the current inner loop. Then, the mathematical model of the back stage of the stator double-winding asynchronous generator grid-connected system is established, and the relationship between active power, reactive power and frequency, phase angle and voltage amplitude is established. The smooth grid connection of virtual synchronous generator is realized by pre-synchronous control strategy. On the basis of using virtual synchronous generator control technology to connect to grid, the mathematical model of inverter under power network fault is established, and the algorithm based on PR current controller is put forward by analyzing the fault process of power network. The low voltage traversing of the virtual synchronous generator is realized by switching with the control algorithm of the virtual synchronous generator, and the feasibility and correctness of the PR current controller under the power network fault are verified by simulation. The switching control algorithm is used to limit the grid-connected current and to provide reactive power to the power network at the time of the fault. The smooth switching of the normal state into the fault state can be realized by synchronizing the phase angle. On the other hand, the power network changes from the fault state to the normal state. After the fault is over, two modes can be switched directly from 50ms to 200ms, which makes the system run in the normal grid-connected control algorithm. The feasibility and stability of the low voltage traversing control strategy of virtual synchronous generator are verified by simulation. The hardware and software of the stator double winding asynchronous generator system are designed. The selection of power devices, the design of control side filter inductors, the design of DC side capacitors and excitation capacitors are completed in hardware, and the key parameters of generator side control circuit are analyzed. The program initialization, voltage and current sampling, data calibration and first-order inertial filtering, orientation angle calculation, coordinate transformation, current hysteresis comparison and so on have been completed in the software. Finally, the generator is driven by a prime mover instead of the wind turbine, and the stator windings asynchronous generator system is realized by using a double closed loop system of voltage outer loop and current inner loop.
【學位授予單位】：江蘇大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM614;TM315

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