基于虚拟同步发电机的光伏并网无缝切换技术研究
发布时间：2018-10-10 16:02
【摘要】：摘要：光伏发电具有成本低,无污染和可再生等诸多优点,已成为可再生能源发电的重要形式。但光照等自然条件的变化,并网时电网电压和频率的波动,以及并网和孤岛之间的模式切换,都会导致光伏发电系统电压和频率不稳定及功率不平衡等问题。因此,采用适宜的并网控制方法,预防上述问题的出现,实现光伏并网系统的并网和孤岛模式之间的无缝切换显得十分重要。 本文以光伏并网系统为研究对象,针对光伏并网系统在电网电压和频率波动及运行模式切换时易导致暂态不稳定的现象,提出了采用虚拟同步发电机(VSG)的并网逆变器控制方法来解决该问题。论文首先建立了包括光伏电源、并网逆变器、储能系统等各部分的数学模型,在此基础上参照和研究了同步发电机的原理,构建了用于控制并网逆变器的虚拟同步发电机算法。它使光伏并网系统能够模拟同步发电机阻抗大、惯性大等优点,满足系统稳定运行的要求。论文重点研究了光伏并网系统在运行模式切换时采用虚拟同步发电机控制算法对维持系统暂态稳定的可行性和有效性。 论文首先介绍了课题的研究背景,阐述了课题研究的必要性。其次分析和建立了光伏并网系统各部分的数学模型,并分析了系统模式切换的原因。在此基础上参考同步发电机原理,构建了虚拟同步发电机算法。之后,研究了虚拟同步发电机控制算法在光伏并网系统模式切换等暂态情况下的控制效果并搭建了系统的Matlab/Simulink模型进行了仿真验证和分析。仿真结果证明了虚拟同步发电机控制算法在光伏并网系统无缝切换时的可行性和准确性。图42幅,表5个,参考文献66篇。
[Abstract]:Abstract: photovoltaic power generation has become an important form of renewable energy generation because of its advantages of low cost, no pollution and renewable. However, the variation of natural conditions such as illumination, the fluctuation of voltage and frequency during grid connection, and the mode switching between grid-connected and isolated islands will lead to voltage and frequency instability and power imbalance in photovoltaic power generation system. Therefore, it is very important to adopt suitable grid-connected control method to prevent the above problems and to realize seamless switching between grid-connected photovoltaic system and islanding mode. In this paper, the photovoltaic grid-connected system is taken as the research object, aiming at the transient instability of the grid-connected photovoltaic system when the voltage and frequency fluctuation of the grid and the switching of the operation mode are easy to lead to the transient instability. A grid-connected inverter control method based on virtual synchronous generator (VSG) is proposed to solve this problem. Firstly, the mathematical models of photovoltaic power supply, grid-connected inverter and energy storage system are established. Based on this, the principle of synchronous generator is studied and a virtual synchronous generator algorithm for grid-connected inverter is constructed. It enables photovoltaic grid-connected system to simulate the advantages of large impedance and inertia of synchronous generator, and meets the requirements of stable operation of the system. This paper focuses on the feasibility and effectiveness of using virtual synchronous generator control algorithm to maintain the transient stability of photovoltaic grid-connected systems. Firstly, the paper introduces the research background of the subject and expounds the necessity of the research. Secondly, the mathematical model of each part of photovoltaic grid-connected system is analyzed and the reason of system mode switching is analyzed. On the basis of this, a virtual synchronous generator algorithm is constructed by referring to the principle of synchronous generator. After that, the control effect of the control algorithm of virtual synchronous generator under the transient condition such as switching mode of photovoltaic grid-connected system is studied, and the Matlab/Simulink model of the system is built for simulation and analysis. The simulation results show the feasibility and accuracy of the virtual synchronous generator control algorithm when the photovoltaic grid-connected system switches seamlessly. There are 42 pictures, 5 tables and 66 references.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615
本文编号：2262396
[Abstract]:Abstract: photovoltaic power generation has become an important form of renewable energy generation because of its advantages of low cost, no pollution and renewable. However, the variation of natural conditions such as illumination, the fluctuation of voltage and frequency during grid connection, and the mode switching between grid-connected and isolated islands will lead to voltage and frequency instability and power imbalance in photovoltaic power generation system. Therefore, it is very important to adopt suitable grid-connected control method to prevent the above problems and to realize seamless switching between grid-connected photovoltaic system and islanding mode. In this paper, the photovoltaic grid-connected system is taken as the research object, aiming at the transient instability of the grid-connected photovoltaic system when the voltage and frequency fluctuation of the grid and the switching of the operation mode are easy to lead to the transient instability. A grid-connected inverter control method based on virtual synchronous generator (VSG) is proposed to solve this problem. Firstly, the mathematical models of photovoltaic power supply, grid-connected inverter and energy storage system are established. Based on this, the principle of synchronous generator is studied and a virtual synchronous generator algorithm for grid-connected inverter is constructed. It enables photovoltaic grid-connected system to simulate the advantages of large impedance and inertia of synchronous generator, and meets the requirements of stable operation of the system. This paper focuses on the feasibility and effectiveness of using virtual synchronous generator control algorithm to maintain the transient stability of photovoltaic grid-connected systems. Firstly, the paper introduces the research background of the subject and expounds the necessity of the research. Secondly, the mathematical model of each part of photovoltaic grid-connected system is analyzed and the reason of system mode switching is analyzed. On the basis of this, a virtual synchronous generator algorithm is constructed by referring to the principle of synchronous generator. After that, the control effect of the control algorithm of virtual synchronous generator under the transient condition such as switching mode of photovoltaic grid-connected system is studied, and the Matlab/Simulink model of the system is built for simulation and analysis. The simulation results show the feasibility and accuracy of the virtual synchronous generator control algorithm when the photovoltaic grid-connected system switches seamlessly. There are 42 pictures, 5 tables and 66 references.
【学位授予单位】：中南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615
【参考文献】
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