本文選題：無軸承永磁發(fā)電機 + 混合勵磁　； 參考：《江蘇大學》2017年碩士論文

【摘要】：隨著工業(yè)技術(shù)的發(fā)展和環(huán)境污染問題的加劇,人們對清潔能源的需求與日俱增,其中電能由于經(jīng)濟、安全和生產(chǎn)輸送的方便性,成為了社會現(xiàn)代化發(fā)展的基石。然而傳統(tǒng)的永磁發(fā)電機(permanent magnet generator,PMG),不僅存在機械軸承摩擦磨損及壽命短的問題,而且在負載變化的工作狀態(tài)下還存在氣隙磁場難以調(diào)節(jié)的缺陷,導致動態(tài)響應(yīng)差,影響電能質(zhì)量和電力系統(tǒng)的穩(wěn)定性。本文針對上述問題提出一種新型混合勵磁式無軸承永磁發(fā)電機(hybrid excitation bearingless permanent magnet generator,HEBPMG),該發(fā)電機集混合勵磁式永磁發(fā)電機和磁懸浮軸承優(yōu)點于一體,在微型電網(wǎng)和并網(wǎng)發(fā)電等領(lǐng)域具有潛在的廣泛應(yīng)用前景。本論文在江蘇省重點研發(fā)計劃項目(BE2016150);江蘇省“青藍工程”資助項目(2014)的支持下,圍繞HEBPMG的結(jié)構(gòu)特性,運行機理,數(shù)學模型及預測直接控制等內(nèi)容展開研究。主要工作及研究成果如下:1.為解決傳統(tǒng)發(fā)電機復雜工況下軸承磨損及磁場難以調(diào)節(jié)的問題,本文提出混合勵磁式無軸承永磁發(fā)電機,并介紹其結(jié)構(gòu)和運行原理。在此基礎(chǔ)上,推導出考慮了轉(zhuǎn)子偏心和洛倫茲力影響的數(shù)學模型。2.基于有限元分析軟件ANSYS/Maxwell,研究了HEBPMG的氣隙磁密分布、懸浮力特性及發(fā)電性能,并進行參數(shù)設(shè)計及分析優(yōu)化。驗證了不同狀態(tài)下數(shù)學模型的準確性,為下文發(fā)電機的控制策略的提出提供理論依據(jù)。3.針對傳統(tǒng)直接轉(zhuǎn)矩控制(direct torque control,DTC)的信號采樣時延的問題,結(jié)合預測控制的基本理論提出了一種預測直接轉(zhuǎn)矩直接懸浮力的控制策略。根據(jù)該控制策略,將HEBPMG系統(tǒng)分為徑向位移閉環(huán)、轉(zhuǎn)速閉環(huán)和發(fā)電電壓閉環(huán)這三部分,并基于繞組磁鏈觀測器及預測器進行系統(tǒng)的預測控制。在預測直接控制框圖的基礎(chǔ)上,采用Matlab/Simulink軟件構(gòu)建了HEBPMG預測直接控制系統(tǒng)的仿真模型,仿真計算結(jié)果驗證了該預測控制方法的有效性及可靠性,以及在負載變化的情況下具有較強的魯棒性。4.依據(jù)HEBPMG的工作原理及控制要求,以TMS320F2812為核心設(shè)計了HEBPMSG的數(shù)字控制系統(tǒng)的軟、硬件。通過采集電壓、電流、轉(zhuǎn)速和位移等信號,控制發(fā)電、勵磁和懸浮繞組的工作狀態(tài),實現(xiàn)HEBPMSG的穩(wěn)定懸浮與發(fā)電。并在變負載的工況下進行了抗干擾實驗,驗證了系統(tǒng)的可行性和預測控制的高效性。
[Abstract]:With the development of industrial technology and the aggravation of environmental pollution, the demand for clean energy is increasing day by day, among which electric energy has become the cornerstone of the development of social modernization because of its economy, safety and ease of production and transportation. However, the traditional permanent magnet generator not only has the problems of friction, wear and short life of mechanical bearings, but also has the defects of air gap magnetic field which is difficult to adjust when the load is changing, which leads to poor dynamic response. It affects the power quality and the stability of power system. In this paper, a new hybrid excitation bearingless permanent magnet generator and HEBPMGG generator are presented to solve the above problems. The generator integrates the advantages of hybrid excitation permanent magnet generator and magnetic suspension bearing. It has potential applications in micro power grid and grid-connected power generation. With the support of the key R & D project of Jiangsu Province (BE2016150) and the project "Green Blue Project" of Jiangsu Province (No. 2014), this paper focuses on the structural characteristics, operational mechanism, mathematical model and direct predictive control of HEBPMG. The main work and research results are as follows: 1. In order to solve the problems of bearing wear and magnetic field difficult to adjust under complex working conditions of traditional generator, this paper presents a hybrid excitation type bearingless permanent magnet generator, and introduces its structure and operation principle. On this basis, a mathematical model. 2. 2, which takes into account the effects of rotor eccentricity and Lorentz force, is derived. Based on the finite element analysis software ANSYS / Maxwell, the airgap magnetic density distribution, suspension force characteristics and generation performance of HEBPMG are studied, and the parameters are designed and optimized. The accuracy of the mathematical model under different states is verified, which provides the theoretical basis for the proposed control strategy of the generator below. Aiming at the problem of signal sampling delay of traditional direct torque control (DTC), a predictive direct torque control (DTC) control strategy is proposed based on the basic theory of predictive control. According to the control strategy, the HEBPMG system is divided into three parts: radial displacement closed loop, rotational speed closed loop and generation voltage closed loop, and the predictive control is based on the windings flux observer and predictor. Based on the block diagram of predictive direct control, the simulation model of HEBPMG predictive direct control system is constructed by Matlab / Simulink software. The simulation results verify the effectiveness and reliability of the predictive control method. And has strong robustness. 4. According to the working principle and control requirements of HEBPMG, the hardware and software of the digital control system of HEBPMSG are designed with TMS320F2812 as the core. The stable suspension and generation of HEBPMSG are realized by collecting voltage, current, rotational speed and displacement signals to control the working state of generating, exciting and suspending windings. The anti-jamming experiment is carried out under the condition of variable load, which verifies the feasibility of the system and the high efficiency of predictive control.
【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】：TM313

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本文編號：2047023