基于Simulink的自激异步发电机电压稳定性分析

发布时间：2019-04-22 12:11

【摘要】：异步发电机有构造简单、生产成本低、易于维修改造和暂态性能优异等众多优点。然而异步发电机带负载时性能较弱,严重制约着其应用范围。当外部参数发生变化时,其输出端电压会变得不稳定继而发生振荡,对发电机和负载有致命的影响,本文针对这一缺点做了相关研究,采用电容短并励补偿无功的方法来尝试解决此问题。Simulink软件是一种适用于电路仿真和电机仿真的工程软件,可以很方便的对电机进行仿真。在考虑磁路饱和与非线性的影响下,本文利用该软件搭建的自激异步发电机带载仿真模型作为研究对象,对提出的问题进行研究。本文从异步机的暂态等值电路出发,考虑磁路饱和和非线性的影响,运用Simulink软件工具,完成了异步机带负载系统Simulink模型的建立。通过实验检验了所搭建的Simulink模型的准确性。在利用该Simulink模型分析异步机的输出端电压时,将分两种情况进行研究,对比研究异步机输出端电压暂态变化与负载功率因数以及负载阻抗之间的关系。采用电容短并励补偿无功的方案。研究显示,短并励电容提供的额外无功可使异步发电机产生更稳定的机端电压。同时,应用Simulink工具搭建短并励连接异步发电机的Simulink模型,研究短并励电容对异步发电机带阻感负载和不可控整流负载暂态过程的影响。完整地分析了不同参数的短并励电容对机端电压和负载端电压暂态运行性能影响。本文中的部分仿真波形有对应的实验作验证,仿真结果与实验结果一致性较好,进一步证明了研究过程的正确性和Simulink模型的准确度。
[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.
【学位授予单位】：青岛大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TM31

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