光伏电站模型对电力系统电压稳定性研究的影响分析

发布时间：2018-05-08 23:25

本文选题：光伏电站 + 电力系统　；参考：《郑州大学》2014年硕士论文

【摘要】：随着我国经济、社会的可持续发展道路的提出，人们开始不断的探索清洁能源的利用,并逐渐大力发展太阳能发电，使光伏发并网容量和规模不断地增大,这也对传统的电力系统带来了许多负面影响，如对系统电压稳定性的影响越来越严重,这些影响严重制约了光伏发电并网系统的发展。因此,必须开展光伏并网发电系统中的非线性行为对电压稳定性影响的深入研究，这具有非常重要的的使用价值和现实意义。本文针对光伏发电站的结构特点，深入研究光伏并网发电系统的运行机理。根据不同的侧重点建立了不同的光伏电站模型，并得到整个光伏并网系统的不同的整体模型。通过分别选择光伏电站输出有功功率及负荷有功功率作为单参数得到其与母线电压的分岔图。对比发现光伏电站模型对分岔理论研究电压稳定性分析的影响。具体研究内容如下: 论文首先对光伏发电并网系统的发展和基本概念、电力系统中电压稳定性的概念及判定方法、分岔理论在电力系统电压稳定研究中的应用以及分岔分析软件MATCONT的使用方法及技巧等进行了综述。在对光伏电站的基本原理及特性进行研究分析的基础上,分别用小信号法、受控源法、简化法对光伏电站进行分析，并建立了光伏电站的小信号模型、受控源模型及简化模型。进一步,应用分岔理论,研究了不同光伏电站模型对光伏并网系统电压稳定性分析的影响，并对不同模型得出不同的分岔图给出了解释。应用分岔理论以及分岔分析软件MATCONT所得的分析结果表明,光伏电站模型选择对利用分岔理论分析光伏发电并网系统电压稳定性研究的结果有着很大的影响。但总的来说，不管是什么原因，光伏电站的模型，对电力系统电压稳定性的定性影响是相同的，都是只出现鞍结分岔点，这样可以得出光伏电站模型在定性上不影响使用分岔理论研究电压稳定性。因此，在运用分岔理论对光伏电站并网对电力系统影响做定性研究时可以选择相对简单、合理的简化模型。但如果要得到精确的影响分析结果，应该选择将光伏电站所有中间非线性元件包括在内的模型。并且由于简化模型省略中间非线性环节，则此模型不适合做动态电压稳定性的研究模型。本文的研究结果对光伏电站并网系统应用分岔理论研究系统的电压稳定性影响的模型选择提供了一定的参考价值。
[Abstract]:With the development of sustainable development of economy and society in our country, people begin to explore the utilization of clean energy and develop solar power generation, which makes the capacity and scale of photovoltaic grid increasing. This has also brought many negative effects to the traditional power system, such as the more and more serious impact on the voltage stability of the system, which seriously restricted the development of photovoltaic grid-connected system. Therefore, it is necessary to deeply study the effect of nonlinear behavior on voltage stability in grid-connected photovoltaic power generation system, which has very important practical value and practical significance. According to the structural characteristics of photovoltaic power station, the operation mechanism of grid-connected photovoltaic power generation system is studied in this paper. According to different emphases, different models of photovoltaic power station are established, and the whole model of the whole photovoltaic grid-connected system is obtained. By selecting the output active power and load active power of photovoltaic power station as single parameter, the bifurcation diagram between the output active power and the bus voltage is obtained. The effect of photovoltaic power station model on voltage stability analysis of bifurcation theory is found. The specific contents of the study are as follows: Firstly, the development and basic concept of grid-connected photovoltaic system, the concept of voltage stability in power system and the method of judging voltage stability are discussed in this paper. The application of bifurcation theory in the study of power system voltage stability and the application methods and techniques of bifurcation analysis software MATCONT are summarized. On the basis of studying and analyzing the basic principle and characteristics of photovoltaic power station, the small signal method, controlled source method and simplified method are used to analyze the photovoltaic power station, and the small signal model, controlled source model and simplified model of photovoltaic power station are established. Furthermore, by using bifurcation theory, the influence of different photovoltaic power station models on the voltage stability analysis of grid-connected photovoltaic system is studied, and the different bifurcation diagrams obtained by different models are explained. The results obtained by using bifurcation theory and bifurcation analysis software MATCONT show that the selection of photovoltaic power station model has great influence on the analysis of voltage stability of photovoltaic grid-connected system using bifurcation theory. But in general, whatever the reason, the qualitative effect of the PV model on the voltage stability of the power system is the same, and there are only saddle node bifurcation points. It can be concluded that the model of photovoltaic power station qualitatively does not affect the voltage stability by bifurcation theory. Therefore, a relatively simple and reasonable simplified model can be chosen when using bifurcation theory to qualitatively study the effect of grid-connected photovoltaic power station on power system. But if we want to obtain accurate results of impact analysis, we should choose the model that includes all the intermediate nonlinear elements of photovoltaic power station. Because the simplified model omits the middle nonlinear link, the model is not suitable for the study of dynamic voltage stability. The results of this paper provide a certain reference value for the model selection of voltage stability of photovoltaic power station grid-connected system using bifurcation theory.
【学位授予单位】：郑州大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TM712

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