發(fā)布時間：2019-04-22 12:11

【摘要】：異步發(fā)電機有構(gòu)造簡單、生產(chǎn)成本低、易于維修改造和暫態(tài)性能優(yōu)異等眾多優(yōu)點。然而異步發(fā)電機帶負載時性能較弱,嚴重制約著其應(yīng)用范圍。當外部參數(shù)發(fā)生變化時,其輸出端電壓會變得不穩(wěn)定繼而發(fā)生振蕩,對發(fā)電機和負載有致命的影響,本文針對這一缺點做了相關(guān)研究,采用電容短并勵補償無功的方法來嘗試解決此問題。Simulink軟件是一種適用于電路仿真和電機仿真的工程軟件,可以很方便的對電機進行仿真。在考慮磁路飽和與非線性的影響下,本文利用該軟件搭建的自激異步發(fā)電機帶載仿真模型作為研究對象,對提出的問題進行研究。本文從異步機的暫態(tài)等值電路出發(fā),考慮磁路飽和和非線性的影響,運用Simulink軟件工具,完成了異步機帶負載系統(tǒng)Simulink模型的建立。通過實驗檢驗了所搭建的Simulink模型的準確性。在利用該Simulink模型分析異步機的輸出端電壓時,將分兩種情況進行研究,對比研究異步機輸出端電壓暫態(tài)變化與負載功率因數(shù)以及負載阻抗之間的關(guān)系。采用電容短并勵補償無功的方案。研究顯示,短并勵電容提供的額外無功可使異步發(fā)電機產(chǎn)生更穩(wěn)定的機端電壓。同時,應(yīng)用Simulink工具搭建短并勵連接異步發(fā)電機的Simulink模型,研究短并勵電容對異步發(fā)電機帶阻感負載和不可控整流負載暫態(tài)過程的影響。完整地分析了不同參數(shù)的短并勵電容對機端電壓和負載端電壓暫態(tài)運行性能影響。本文中的部分仿真波形有對應(yīng)的實驗作驗證,仿真結(jié)果與實驗結(jié)果一致性較好,進一步證明了研究過程的正確性和Simulink模型的準確度。
[Abstract]:Asynchronous generator has many advantages, such as simple structure, low production cost, easy maintenance and improvement, excellent transient performance and so on. However, the performance of asynchronous generator with load is weak, which seriously restricts its application range. When the external parameters change, the output voltage becomes unstable and then oscillates, which has a fatal effect on the generator and load. The method of compensating reactive power with short shunt capacitor is used to solve this problem. Simulink software is a kind of engineering software suitable for circuit simulation and motor simulation, which can simulate the motor conveniently. Considering the influence of saturation and nonlinearity of magnetic circuit, the self-excited asynchronous generator load-loaded simulation model built by the software is used as the research object, and the proposed problems are studied. In this paper, starting from the transient equivalent circuit of the asynchronous motor, considering the influence of saturation and nonlinearity of magnetic circuit, the Simulink model of the asynchronous machine with load system is established by using Simulink software tool. The accuracy of the Simulink model is verified by experiments. When the Simulink model is used to analyze the output voltage of the asynchronous machine, the relationship between the transient variation of the output voltage, the load power factor and the load impedance is studied in two cases. The scheme of compensating reactive power by short capacitor shunt excitation is adopted. It is shown that the additional reactive power provided by the short shunt capacitor can produce more stable terminal voltage of the asynchronous generator. At the same time, the Simulink model of asynchronous generator with short shunt connection is built by using Simulink tool, and the effect of short shunt capacitor on transient process of asynchronous generator with resistance inductance load and uncontrollable rectifying load is studied. The effect of short shunt capacitor with different parameters on transient performance of terminal voltage and load terminal voltage is analyzed. Some of the simulation waveforms in this paper are verified by the corresponding experiments, and the simulation results are in good agreement with the experimental results. The correctness of the research process and the accuracy of the Simulink model are further proved.
【學位授予單位】：青島大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM31

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本文編號：2462821