發(fā)布時(shí)間：2019-01-30 07:32

【摘要】：由于環(huán)境污染的嚴(yán)重和全球能源的急劇緊缺,人們對(duì)可再生能源的需求越來越迫切。光伏發(fā)電因其清潔無污染并且可持續(xù)而得到了重視。單相光伏并網(wǎng)逆變系統(tǒng)越來越受到人們的重視。如何有效增加光伏系統(tǒng)的效率,保證系統(tǒng)的穩(wěn)定運(yùn)行非常重要。針對(duì)這一問題,本文展開相關(guān)研究分析,主要包括以下幾點(diǎn):(1)在研究光伏電池的工作原理、數(shù)學(xué)建�；A(chǔ)上,分析了傳統(tǒng)的MPPT算法,并提出了新型算法——基于恒定電壓法和修正的變步長電導(dǎo)增量法相結(jié)合的最大功率點(diǎn)跟蹤方法。利用MATLAB軟件對(duì)其建模,結(jié)果顯示新算法能夠提高系統(tǒng)跟蹤的快速性和穩(wěn)定性;經(jīng)過比較PWM調(diào)制方式的優(yōu)缺點(diǎn),確定后級(jí)逆變采用單極性倍頻SPWM(正弦脈寬調(diào)制)技術(shù),采用電壓、電流雙閉環(huán)比例-積分反饋控制策略。(2)提出了單相光伏并網(wǎng)逆變系統(tǒng)的總體設(shè)計(jì)方案,前級(jí)升壓采用Boost升壓電路和推挽升壓電路相結(jié)合,后級(jí)DC/AC逆變采用全橋逆變電路。在Boost電路中實(shí)現(xiàn)最大功率點(diǎn)跟蹤并給儲(chǔ)能蓄電池充電,推挽升壓電路將蓄電池電壓升高到350V左右輸送到全橋逆變電路進(jìn)行逆變。(3)對(duì)系統(tǒng)的硬件電路進(jìn)行設(shè)計(jì),包括Boost升壓電路、推挽升壓電路、DC/AC全橋逆變電路、驅(qū)動(dòng)電路、LCL濾波電路、電壓電流采樣調(diào)理電路、過零點(diǎn)比較電路以及相關(guān)保護(hù)電路等。選用DSP28335作為控制芯片,利用CCS3.3開發(fā)軟件對(duì)系統(tǒng)進(jìn)行編寫程序并進(jìn)行調(diào)試。(4)研制了一臺(tái)實(shí)驗(yàn)樣機(jī),并進(jìn)行升壓、逆變、并網(wǎng)等相關(guān)實(shí)驗(yàn),利用示波器等實(shí)驗(yàn)儀器觀察采集系統(tǒng)實(shí)驗(yàn)波形,并對(duì)其進(jìn)行量化分析,驗(yàn)證了本文所設(shè)計(jì)的單相光伏并網(wǎng)逆變系統(tǒng)的合理性。
[Abstract]:Due to the serious environmental pollution and the sharp shortage of global energy, the demand for renewable energy is becoming more and more urgent. Photovoltaic power generation has been paid attention to because of its clean and non-pollution and sustainable. Single-phase photovoltaic grid-connected inverter system has been paid more and more attention. It is very important to increase the efficiency of photovoltaic system and ensure the stable operation of the system. Aiming at this problem, this paper carries out related research and analysis, mainly including the following: (1) on the basis of studying the working principle of photovoltaic cells and mathematical modeling, the traditional MPPT algorithm is analyzed. A new algorithm, the maximum power point tracking method based on constant voltage method and modified variable-step conductance increment method, is proposed. Using MATLAB software to model the system, the results show that the new algorithm can improve the system tracking speed and stability; After comparing the advantages and disadvantages of PWM modulation mode, it is determined that unipolarity frequency doubling SPWM (sinusoidal pulse width modulation) technique and voltage are used in the back stage inverter. Current double closed loop proportional integral feedback control strategy. (2) the overall design scheme of single-phase photovoltaic grid-connected inverter system is proposed. The front stage boost adopts Boost boost circuit and push-pull boost circuit. The whole bridge inverter circuit is used in the DC/AC inverter. The maximum power point tracking is realized in the Boost circuit and the energy storage battery is charged. The push-pull boost circuit raises the battery voltage to 350 V or so and conveys the battery voltage to the full-bridge inverter circuit for inverter. (3) the hardware circuit of the system is designed. It includes Boost boost circuit, push-pull boost circuit, DC/AC full-bridge inverter circuit, driving circuit, LCL filter circuit, voltage and current sampling conditioning circuit, zero-crossing comparison circuit and related protection circuit. DSP28335 is selected as the control chip, and the system is programmed and debugged by using the CCS3.3 development software. (4) A prototype is developed, and related experiments, such as booster, inverter and grid connection, are carried out. By using oscilloscope and other experimental instruments to observe the experimental waveform of the acquisition system and analyze it quantificationally, the rationality of the single-phase photovoltaic grid-connected inverter system designed in this paper is verified.
【學(xué)位授予單位】：江蘇大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM615;TM464

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本文編號(hào)：2417902