本文選題：光伏電站 + 電力系統(tǒng)　； 參考：《鄭州大學》2014年碩士論文

【摘要】：隨著我國經(jīng)濟、社會的可持續(xù)發(fā)展道路的提出，人們開始不斷的探索清潔能源的利用,并逐漸大力發(fā)展太陽能發(fā)電，使光伏發(fā)并網(wǎng)容量和規(guī)模不斷地增大,這也對傳統(tǒng)的電力系統(tǒng)帶來了許多負面影響，如對系統(tǒng)電壓穩(wěn)定性的影響越來越嚴重,這些影響嚴重制約了光伏發(fā)電并網(wǎng)系統(tǒng)的發(fā)展。因此,必須開展光伏并網(wǎng)發(fā)電系統(tǒng)中的非線性行為對電壓穩(wěn)定性影響的深入研究，這具有非常重要的的使用價值和現(xiàn)實意義。本文針對光伏發(fā)電站的結構特點，深入研究光伏并網(wǎng)發(fā)電系統(tǒng)的運行機理。根據(jù)不同的側重點建立了不同的光伏電站模型，并得到整個光伏并網(wǎng)系統(tǒng)的不同的整體模型。通過分別選擇光伏電站輸出有功功率及負荷有功功率作為單參數(shù)得到其與母線電壓的分岔圖。對比發(fā)現(xiàn)光伏電站模型對分岔理論研究電壓穩(wěn)定性分析的影響。具體研究內容如下: 論文首先對光伏發(fā)電并網(wǎng)系統(tǒng)的發(fā)展和基本概念、電力系統(tǒng)中電壓穩(wěn)定性的概念及判定方法、分岔理論在電力系統(tǒng)電壓穩(wěn)定研究中的應用以及分岔分析軟件MATCONT的使用方法及技巧等進行了綜述。 在對光伏電站的基本原理及特性進行研究分析的基礎上,分別用小信號法、受控源法、簡化法對光伏電站進行分析，并建立了光伏電站的小信號模型、受控源模型及簡化模型。 進一步,應用分岔理論,研究了不同光伏電站模型對光伏并網(wǎng)系統(tǒng)電壓穩(wěn)定性分析的影響，并對不同模型得出不同的分岔圖給出了解釋。 應用分岔理論以及分岔分析軟件MATCONT所得的分析結果表明,光伏電站模型選擇對利用分岔理論分析光伏發(fā)電并網(wǎng)系統(tǒng)電壓穩(wěn)定性研究的結果有著很大的影響。但總的來說，不管是什么原因，光伏電站的模型，對電力系統(tǒng)電壓穩(wěn)定性的定性影響是相同的，都是只出現(xiàn)鞍結分岔點，這樣可以得出光伏電站模型在定性上不影響使用分岔理論研究電壓穩(wěn)定性。因此，在運用分岔理論對光伏電站并網(wǎng)對電力系統(tǒng)影響做定性研究時可以選擇相對簡單、合理的簡化模型。但如果要得到精確的影響分析結果，應該選擇將光伏電站所有中間非線性元件包括在內的模型。并且由于簡化模型省略中間非線性環(huán)節(jié)，則此模型不適合做動態(tài)電壓穩(wěn)定性的研究模型。 本文的研究結果對光伏電站并網(wǎng)系統(tǒng)應用分岔理論研究系統(tǒng)的電壓穩(wěn)定性影響的模型選擇提供了一定的參考價值。
[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.
【學位授予單位】：鄭州大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM712

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