【摘要】：隨著工業(yè)對清潔、可再生能源的需求量越來越大,新能源開發(fā)已經(jīng)變得越來越重要。其中,太陽能因其儲量大、安全系數(shù)高等優(yōu)勢受到了越來越多國家的重視。近幾年,光伏并網(wǎng)發(fā)電技術取得了長足進步,但依然存在很多亟需解決的問題,如光伏電池發(fā)電效率低、諧波含量高、并網(wǎng)電流波形不佳、存在孤島效應等。針對這些問題,論文以光伏并網(wǎng)發(fā)電系統(tǒng)為研究對象,對Z源逆變器及其并網(wǎng)控制策略、光伏最大功率點跟蹤技術、孤島檢測技術進行了深入的研究。在分析傳統(tǒng)光伏逆變器拓撲結構及其存在局限性基礎上,對Z源逆變器進行了研究,闡述了Z源逆變器的升壓原理、換流過程、調(diào)制方法。仿真研究了光伏電池的輸出特性,闡述了光伏最大功率點跟蹤的原理以及傳統(tǒng)控制策略的不足,研究了基于模糊控制的最大功率點跟蹤策略。仿真表明,基于模糊控制的最大功率點跟蹤策略相對于傳統(tǒng)的擾動觀察法控制策略,具有追蹤速度快、輸出功率穩(wěn)定等優(yōu)勢。研究了采用電壓電流雙環(huán)控制的Z源光伏并網(wǎng)發(fā)電系統(tǒng),首先研究了Z源逆變器的電壓外環(huán)、電流內(nèi)環(huán)的雙閉環(huán)并網(wǎng)控制策略。之后,對并網(wǎng)過程中存在的孤島現(xiàn)象進行了分析,闡述了孤島檢測的原理、檢測方法,提出了基于正反饋的AFD孤島檢測技術。通過Matlab/Simulink仿真分析,驗證了并網(wǎng)策略、孤島檢測方法的可行性�；谌鹚_HD64F2166VTE33V單片機設計了Z源光伏并網(wǎng)逆變器,設計了H橋逆變電路、電網(wǎng)電壓采集電路、驅動電路,并編制系統(tǒng)軟件。實驗結果驗證了理論分析以及仿真研究的正確性。
[Abstract]:New energy development has become more and more important as the demand for renewable energy is increasing in industry. Among them, solar energy has been paid more and more attention by more and more countries because of its large reserves and high safety factor. In recent years, photovoltaic grid-connected power generation technology has made great progress, but there are still many problems that need to be solved, such as low efficiency of photovoltaic cell generation, high harmonic content, poor grid-connected current waveform, island effect and so on. Aiming at these problems, this paper takes photovoltaic grid-connected power generation system as the research object, and deeply studies Z-source inverter and its grid-connected control strategy, photovoltaic maximum power point tracking technology and islanding detection technology. On the basis of analyzing the topology structure of traditional photovoltaic inverter and its limitation, the Z-source inverter is studied, and the boost principle, commutation process and modulation method of Z-source inverter are expounded. The output characteristics of photovoltaic cell are studied by simulation. The principle of photovoltaic maximum power point tracking and the shortcomings of traditional control strategy are described. The maximum power point tracking strategy based on fuzzy control is studied. The simulation results show that the maximum power point tracking strategy based on fuzzy control has the advantages of fast tracking speed and stable output power compared with the traditional disturbance observation control strategy. The Z-source photovoltaic grid-connected generation system with voltage and current double loop control is studied. Firstly, the voltage outer loop and the current inner loop of the Z-source inverter are studied. Then, the phenomenon of islanding in the process of grid connection is analyzed, the principle and method of islanding detection are expounded, and the AFD islanding detection technology based on positive feedback is put forward. The feasibility of grid-connected strategy and islanding detection method is verified by Matlab/Simulink simulation. The Z-source photovoltaic grid-connected inverter, H-bridge inverter, grid voltage acquisition circuit, driving circuit and system software are designed based on Raysa HD64F2166VTE33V microcontroller. The experimental results verify the correctness of the theoretical analysis and simulation.
【學位授予單位】：南京師范大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TM464;TM615

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