本文選題：最大功率點(diǎn)跟蹤 + DC-DC變換器��； 參考：《東北大學(xué)》2012年碩士論文

【摘要】：隨著全球?qū)δ茉葱枨蟮牟粩嘣鲩L,傳統(tǒng)能源迅速消耗引發(fā)的能源危機(jī)和環(huán)境污染問題已不容忽視,可再生能源開發(fā)和利用受到了普遍重視。其中,太陽能以其資源豐富、可再生、清潔無害等優(yōu)點(diǎn)而備受青睞。近年來,太陽能發(fā)電技術(shù)的不斷進(jìn)步使得光伏電站逐漸具備大規(guī)模發(fā)電的能力,而光伏并網(wǎng)發(fā)電將成為太陽能利用的一個(gè)重要途徑。因此,對光伏并網(wǎng)系統(tǒng)的研究與設(shè)計(jì)是具有實(shí)際意義的。 本文主要以單相并網(wǎng)系統(tǒng)為研究對象,從并網(wǎng)系統(tǒng)的拓?fù)浣Y(jié)構(gòu)、參數(shù)的選擇、最大功率點(diǎn)跟蹤以及單相并網(wǎng)與有源濾波相結(jié)合的控制策略等方面對光伏并網(wǎng)系統(tǒng)作了詳細(xì)的分析和研究。 首先,利用MATLAB/Simulink仿真軟件對光伏電池板的數(shù)學(xué)模型進(jìn)行仿真分析,了解太陽能電池板的輸出特性,分析太陽能電池板在光照和溫度變化時(shí)對輸出特性的影響,為最大功率點(diǎn)跟蹤(MPPT)提供可行性的理論基礎(chǔ)。在此基礎(chǔ)上,研究了幾種常用的最大功率點(diǎn)跟蹤方法,并通過對這些方法的對比,對傳統(tǒng)跟蹤法進(jìn)行了改進(jìn),減小了在尋優(yōu)過程中出現(xiàn)誤判斷的概率。 其次,針對小功率單相并網(wǎng)系統(tǒng)的特點(diǎn),采用了體積小,成本低,易于控制的DC-DC升壓電路和全橋式DC-AC逆變電路雙極式主電路拓?fù)浣Y(jié)構(gòu)。通過理論分析和計(jì)算,對主電路中元器件進(jìn)行了參數(shù)選擇和硬件電路設(shè)計(jì)。 此外,本文采用SPWM雙閉環(huán)跟蹤控制方式,結(jié)合電網(wǎng)電壓前饋控制方案,實(shí)現(xiàn)并網(wǎng)電流與電網(wǎng)電壓同步；同時(shí)用電壓外環(huán)保證了母線電壓的穩(wěn)定。由于傳統(tǒng)PI調(diào)節(jié)無法實(shí)現(xiàn)無差跟蹤,作者采用ZPR(準(zhǔn)比例諧振調(diào)節(jié)控制器)對系統(tǒng)進(jìn)行改進(jìn),并通過MATLAB/Simulink仿真,驗(yàn)證了該控制策略的有效性。
[Abstract]:With the increasing of global energy demand, the energy crisis and environmental pollution caused by the rapid consumption of traditional energy can not be ignored, and the development and utilization of renewable energy have been paid more and more attention. Among them, solar energy is favored for its rich resources, renewable, clean and harmless. In recent years, with the continuous progress of solar power generation technology, photovoltaic power plants gradually have the capacity of large-scale power generation, and grid-connected photovoltaic power generation will become an important way to use solar energy. Therefore, the research and design of photovoltaic grid-connected system is of practical significance. This paper mainly takes single-phase grid-connected system as the research object, from the topology structure of grid-connected system, the choice of parameters, The photovoltaic grid-connected system is analyzed and studied in detail from the aspects of maximum power point tracking and the control strategy of the combination of single-phase grid-connected and active filter. First of all, the mathematical model of photovoltaic panel is simulated and analyzed by using MATLAB/Simulink simulation software to understand the output characteristics of solar panel, and analyze the influence of solar panel on the output characteristics when the light and temperature change. It provides a theoretical basis for the feasibility of maximum power point tracking (MPPT). On this basis, several commonly used maximum power point tracking methods are studied, and through the comparison of these methods, the traditional tracking method is improved to reduce the probability of misjudgment in the process of optimization. Secondly, according to the characteristics of single-phase grid-connected system with small power, DC-DC boost circuit with small volume, low cost and easy control, and bipolar main circuit topology of full-bridge DC-AC inverter circuit are adopted. Through theoretical analysis and calculation, the parameters of the main circuit and the hardware circuit design are selected. In addition, this paper adopts SPWM double closed-loop tracking control method, combined with the feedforward control scheme of grid voltage, to realize the synchronization of grid-connected current and grid voltage, and proves the stability of busbar voltage by using environmental protection outside voltage. Because the traditional Pi regulation can not realize the difference free tracking, the author uses ZPR (quasi-proportional resonance regulator) to improve the system, and verifies the effectiveness of the control strategy by MATLAB/Simulink simulation.
【學(xué)位授予單位】：東北大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TM615

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本文編號：1926567