光伏电源三相混联接入系统混成自动机控制研究

发布时间：2018-11-26 06:42

【摘要】：太阳能作为一种清洁的可再生资源,其开发利用受到世界各国的高度重视。太阳能光伏发电是太阳能利用的一种有效形式,随着光伏转换技术日益成熟,越来越成为世界各国大力开发的一种重要的新能源发电。由于光伏发电受光照强度、电池板转换效率以及控制技术等多方面影响,对于电力系统来说,光伏电源属于一种不可控的间歇式电源,现有的光伏电源与主电网并联的联合运行方法,较好地解决了光伏电源作为电力系统辅助电源支撑的接入问题,但是会影响电力系统运行的电能质量、频率和电压稳定性。本文为了改进光伏电源并联接入主电网运行的不足,探讨了并联与串联相结合的光伏电源混联接入方式,重点研究了光伏电源三相混联接入系统的混成自动机控制方法。论文首先介绍了光伏发电研究现状和光伏发电系统的主要类型,分析了光伏电源接入主电网的接入方式和控制方法。然后,探讨了并联与串联相结合的光伏电源三相混联接入方式,详细分析了基于电力电子技术的光伏电源三相混联接入方式的主电路结构；详细阐述了混成控制系统及其混成自动机理论的基本原理。在此基础上,进一步分析了光伏电源三相混联接入并网系统的混成特性以及其混成自动机理论建模的原理和过程,建立了光伏电源三相混联接入并网系统运行的混成自动机模型。此后,深入研究了基于混成自动机模型的光伏电源三相混联接入并网系统运行控制器,对光伏阵列最大功率跟踪控制和三相混联接入方式的功率接口多功能输出控制的混成自动机控制方法的原理、算法和实现进行了详细研究。最后,运用Matlab/Simulink仿真平台,进行了计算机仿真,给出了仿真结果。仿真结果进一步验证了理论分析的正确性。本文研究的光伏电源三相混联接入系统的混成自动机控制方法,在实现并联运行方式的功能的基础上,增加了电能质量统一控制功能,不仅能够抑制光伏电源对主电网的不利影响,而且可以改善主电网的电能质量,因此既具有很好的理论研究意义,也有很好的实际工程应用价值。
[Abstract]:Solar energy as a clean renewable resource, its development and utilization has been attached great importance to the world. Solar photovoltaic power generation is an effective form of solar energy utilization. With the development of photovoltaic conversion technology, it has become an important new energy generation in the world. Photovoltaic power generation is affected by illumination intensity, panel conversion efficiency and control technology. For power system, photovoltaic power supply is an uncontrollable intermittent power supply. The existing joint operation method of photovoltaic power supply and main grid solves the access problem of photovoltaic power supply as auxiliary power source, but it will affect the power quality, frequency and voltage stability of power system. In this paper, in order to improve the shortage of photovoltaic power supply connected in parallel to the main grid, the hybrid access mode of photovoltaic power supply is discussed, and the hybrid automaton control method of the three-phase hybrid access system of photovoltaic power supply is studied. Firstly, this paper introduces the research status of photovoltaic power generation and the main types of photovoltaic power generation system, and analyzes the access mode and control method of photovoltaic power supply to the main grid. Then, the three-phase hybrid access mode of photovoltaic power supply is discussed, and the main circuit structure of three-phase hybrid access mode of photovoltaic power supply based on power electronics technology is analyzed in detail. The basic principle of the hybrid control system and the theory of hybrid automata are described in detail. On this basis, the mixing characteristics of the three-phase hybrid grid-connected photovoltaic power system and the principle and process of the theoretical modeling of the hybrid automaton are further analyzed. A hybrid automaton model of three-phase hybrid access and grid-connected system for photovoltaic power supply is established. After that, the operation controller of three-phase hybrid access and grid-connected system based on hybrid automaton model is studied. The principle, algorithm and implementation of hybrid automata control method for maximum power tracking control of photovoltaic array and power interface multi-function output control of three-phase hybrid access mode are studied in detail. Finally, the computer simulation is carried out using Matlab/Simulink simulation platform, and the simulation results are given. The simulation results further verify the correctness of the theoretical analysis. The hybrid automaton control method of the three-phase hybrid access system of photovoltaic power supply is studied in this paper. On the basis of realizing the function of parallel operation mode, the unified control function of power quality is added. It can not only restrain the adverse effect of photovoltaic power supply on the main grid, but also improve the power quality of the main power grid, so it has good theoretical significance and practical application value.
【学位授予单位】：长沙理工大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM615
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本文编号：2357607