【摘要】：隨著工業(yè)化的深入,能源與環(huán)境是人類無法回避的問題。各類新能源技術(shù)成為各國的研究重點,光伏發(fā)電作為太陽能的重要利用方式成為新能源技術(shù)的重要研究方向。孤島檢測作為光伏并網(wǎng)逆變器必備的一項功能,成為并網(wǎng)發(fā)電領(lǐng)域的重要研究方向。本文以非隔離型單相光伏并網(wǎng)逆變器為研究基礎(chǔ),對孤島檢測技術(shù)及并網(wǎng)控制方式進行研究。 本文闡述了孤島檢測技術(shù)的意義和研究現(xiàn)狀,在對比分析了現(xiàn)有檢測標(biāo)準(zhǔn),評估方式和主要檢測方案的基礎(chǔ)上,選擇基于移頻、移相及電流幅值擾動的孤島檢測方案作為本文的研究重點,在Qf0×Gnorm坐標(biāo)系中對算法盲區(qū)評估,并仿真驗證了算法的檢測效果。此外,文章分析了單相光伏逆變器的工作原理和結(jié)構(gòu)拓?fù)?確定采用兩級式非隔離結(jié)構(gòu),逆變部分采用H橋拓?fù)?使用電壓電流閉環(huán)SPWM控制方式,并通過建模仿真驗證了控制算法的可實現(xiàn)性。 本文在系統(tǒng)整體分析和仿真分析的基礎(chǔ)上,完成了3kW樣機的研制,包括主功率電路,驅(qū)動電路,采樣電路,電源電路等功能電路的設(shè)計,以及關(guān)鍵程序的設(shè)計。并對樣機進行了實驗,分析了樣機在各個功率條件下的效率,輸出電流的諧波失真度。按照測試標(biāo)準(zhǔn),對樣機的孤島算法進行實驗驗證。
[Abstract]:With the deepening of industrialization, energy and environment is an unavoidable problem. All kinds of new energy technologies have become the focus of research all over the world. Photovoltaic power generation as an important way of solar energy utilization has become an important research direction of new energy technology. As a necessary function of photovoltaic grid-connected inverter, islanding detection has become an important research direction in grid-connected power generation field. Based on the non-isolated single-phase photovoltaic grid-connected inverter, the islanding detection technology and grid-connected control method are studied in this paper. In this paper, the significance and research status of islanding detection technology are described. Based on the comparison and analysis of the existing detection standards, evaluation methods and main detection schemes, frequency shift is selected. The isolated island detection scheme of phase shift and current amplitude disturbance is the focus of this paper. The blind area of the algorithm is evaluated in Qf0 脳 Gnorm coordinate system, and the detection effect of the algorithm is verified by simulation. In addition, the working principle and structure topology of single-phase photovoltaic inverter are analyzed. The two-stage non-isolated structure, H-bridge topology and voltage and current closed-loop SPWM control mode are used in the inverter. The realizability of the control algorithm is verified by modeling and simulation. On the basis of the whole system analysis and simulation analysis, the 3kW prototype is developed, including the design of the main power circuit, the driving circuit, the sampling circuit, the power supply circuit, and the design of the key program. The efficiency of the prototype and the harmonic distortion of the output current are analyzed. According to the test standard, the islanding algorithm of the prototype is verified experimentally.
【學(xué)位授予單位】：南京理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM464;TM615

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