【摘要】：近年來,隨著化石燃料的常規(guī)式利用不斷增加,不僅資源的利用效率低而且對環(huán)境造成了很大污染。在政府部門的積極推進(jìn)下,光伏發(fā)電以其清潔、廣泛、無污染的特點(diǎn),從最初的軍用到如今走進(jìn)千家萬戶,既解決了能源短缺和環(huán)境污染的難題,又推動(dòng)了當(dāng)?shù)亟?jīng)濟(jì)發(fā)展。在光伏發(fā)電系統(tǒng)中最為關(guān)鍵的是系統(tǒng)的效率,與傳統(tǒng)的隔離型逆變器相比,非隔離型逆變器憑借著體積小、效率高、功率密度大等優(yōu)勢成為研究的熱點(diǎn)。然而由于缺少了變壓器,系統(tǒng)存在著漏電流的問題,本文以漏電流為重點(diǎn)展開分析。第一,通過分析常規(guī)光伏并網(wǎng)系統(tǒng)的拓?fù)?針對三電平逆變中母線電壓不平衡的問題,提出一種可以實(shí)現(xiàn)母線電壓平衡的拓?fù)?詳細(xì)分析了其補(bǔ)償原理;同時(shí),為了抑制非隔離型逆變器的漏電流,提出了一種新型拓?fù)洹５诙?本文重點(diǎn)對抑制非隔離型逆變器的漏電流進(jìn)行研究。首先,從漏電流產(chǎn)生的源頭,分析了逆變系統(tǒng)中分布電容的產(chǎn)生機(jī)理;其次,對系統(tǒng)中諧振電路建立等效數(shù)學(xué)模型并推導(dǎo)出:當(dāng)系統(tǒng)中共模電壓保持恒定的幅值,系統(tǒng)中的漏電流為零。并且對比了單極性調(diào)制和雙極性調(diào)制對系統(tǒng)共模電壓和漏電流的影響;然后,對H6拓?fù)涞耐負(fù)浣Y(jié)構(gòu)及工作原理進(jìn)行分析,并且通過Matlab仿真出系統(tǒng)的共模電壓和漏電流;最后,對本文提出的新型拓?fù)鋸碾娐反罱�、工作模態(tài)分析到Matlab仿真都作了細(xì)致而全面的推導(dǎo)和分析。第三,針對系統(tǒng)中濾波電感和輔助開關(guān)電源進(jìn)行設(shè)計(jì)。首先根據(jù)系統(tǒng)的實(shí)際參數(shù)計(jì)算電感量,然后運(yùn)用迭代計(jì)算的方式確定磁環(huán)型號并且進(jìn)行了參數(shù)的驗(yàn)證,最后根據(jù)磁環(huán)的參數(shù)計(jì)算出電感的損耗和溫升。對于輔助電源主要是對RCD緩沖電路、反饋補(bǔ)償電路、UC3842及其外圍電路的參數(shù)進(jìn)行了詳細(xì)的推導(dǎo)計(jì)算。第四,為了驗(yàn)證文中設(shè)計(jì)的濾波電感、輔助電源以及新型拓?fù)湟种坡╇娏鞯恼_性與合理性,按照理論設(shè)計(jì)搭建出實(shí)驗(yàn)樣機(jī),對系統(tǒng)的濾波電流、共模電壓、漏電流以及輔助電源的關(guān)鍵信號進(jìn)行了測量,達(dá)到了設(shè)計(jì)的要求。
[Abstract]:In recent years, with the increasing of the conventional use of fossil fuels, not only the efficiency of resource utilization is low, but also the environment is polluted greatly. With the active promotion of government departments, photovoltaic power generation with its clean, extensive, pollution-free characteristics, from the initial military to now into thousands of households, not only solve the problem of energy shortage and environmental pollution, but also promote the development of local economy. In photovoltaic power generation system, the efficiency of the system is the most critical. Compared with the traditional isolated inverter, the non-isolated inverter has become a research hotspot because of its advantages of small size, high efficiency, high power density and so on. However, due to the lack of transformer, the system has leakage current problem, this paper focuses on leakage current analysis. First, by analyzing the topology of conventional photovoltaic grid-connected system, aiming at the imbalance of bus voltage in three-level inverter, a topology that can realize bus voltage balance is proposed, and its compensation principle is analyzed in detail. In order to suppress leakage current of non-isolated inverter, a new topology is proposed. Second, this paper focuses on the suppression of leakage current of non-isolated inverter. Firstly, from the source of leakage current, the generation mechanism of distributed capacitance in inverter system is analyzed. Secondly, the equivalent mathematical model of resonant circuit in the system is established and deduced: when the common-mode voltage in the system keeps constant amplitude, The leakage current in the system is zero. The effects of unipolar modulation and bipolar modulation on the common mode voltage and leakage current of the system are compared. Then, the topological structure and working principle of the H6 topology are analyzed, and the common mode voltage and leakage current of the system are simulated by Matlab. This paper presents a detailed and comprehensive derivation and analysis of the new topology proposed in this paper, from circuit construction, working mode analysis to Matlab simulation. Thirdly, the filter inductor and auxiliary switching power supply are designed. First, the inductance is calculated according to the actual parameters of the system, then the type of the magnetic ring is determined by iterative calculation and the parameters are verified. Finally, the loss and temperature rise of the inductor are calculated according to the parameters of the magnetic ring. For auxiliary power supply, the parameters of RCD snubber circuit, feedback compensation circuit UC3842 and its peripheral circuits are deduced and calculated in detail. Fourthly, in order to verify the correctness and rationality of the filter inductor, auxiliary power supply and new topology suppression leakage current, the experimental prototype is designed according to the theory, and the filtering current and common-mode voltage of the system are designed. The leakage current and the key signals of the auxiliary power supply are measured to meet the design requirements.
【學(xué)位授予單位】：南昌航空大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM464

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