發(fā)布時(shí)間：2018-08-03 09:04

【摘要】：進(jìn)入21世紀(jì)以來(lái)人類社會(huì)處于生態(tài)環(huán)境嚴(yán)重被污染、化石能源短缺的狀態(tài)。太陽(yáng)能是一種綠色的可再生能源,光伏發(fā)電與光熱發(fā)電是太陽(yáng)能發(fā)電的主要利用形式,光伏并網(wǎng)發(fā)電具有無(wú)污染、安全可靠等優(yōu)點(diǎn),被人們廣泛運(yùn)用。光伏并網(wǎng)發(fā)電過(guò)程中發(fā)生的孤島效應(yīng)機(jī)率隨之增加,而孤島效應(yīng)產(chǎn)生的危害也越來(lái)越嚴(yán)重,因此解決孤島效應(yīng)問(wèn)題迫在眉睫,尋求快速有效的孤島檢測(cè)方法具有現(xiàn)實(shí)意義。本文主要研究單相小功率光伏并網(wǎng)中產(chǎn)生的孤島效應(yīng)問(wèn)題。 首先本文研究了孤島效應(yīng)發(fā)生的原理、產(chǎn)生的危害以及目前孤島效應(yīng)在國(guó)內(nèi)外的研究狀況和孤島檢測(cè)標(biāo)準(zhǔn)。其次,對(duì)比分析了孤島效應(yīng)的主動(dòng)式、被動(dòng)式和其它檢測(cè)方法的原理和優(yōu)缺點(diǎn),為本文采用的主動(dòng)頻率孤島檢測(cè)法、正反饋主動(dòng)頻移孤島檢測(cè)法和主動(dòng)電流擾動(dòng)法孤島檢測(cè)奠定了理論基礎(chǔ)。再次,詳細(xì)討論了這三種方法的工作原理、優(yōu)缺點(diǎn)和盲區(qū)檢測(cè)范圍,通過(guò)M4ATLAB仿真研究發(fā)現(xiàn)：采用主動(dòng)電流擾動(dòng)法在并網(wǎng)逆變器輸出功率大于、等于和小于負(fù)載消耗的功率情況下,能快速地檢測(cè)到孤島狀態(tài),且當(dāng)逆變器單臺(tái)運(yùn)行時(shí)不存在檢測(cè)盲區(qū)。 本文采用STC12C5A162S芯片控制孤島檢測(cè)核心電路,設(shè)計(jì)了交流電壓、電流和頻率檢測(cè)電路、IGBT驅(qū)動(dòng)電路、整流濾波電路,故障檢測(cè)電路、數(shù)碼管顯示控制電路等,編寫了孤島檢測(cè)算法相關(guān)程序和控制流程圖。結(jié)合軟件和硬件設(shè)計(jì),搭建了1000W/220V單相小功率光伏并網(wǎng)發(fā)電系統(tǒng),在此系統(tǒng)下完成了單相并網(wǎng)測(cè)試和采用的主動(dòng)電流擾動(dòng)法進(jìn)行孤島效應(yīng)實(shí)驗(yàn),最后總結(jié)全文。
[Abstract]:Since entering the 21st century, human society has been in a state of serious pollution of ecological environment and shortage of fossil energy. Solar energy is a kind of green renewable energy. Photovoltaic power generation and photothermal generation are the main forms of solar power generation. Photovoltaic grid-connected power generation has the advantages of pollution-free, safe and reliable, and has been widely used. The probability of islanding effect in grid-connected photovoltaic power generation is increasing, and the harm of islanding effect is becoming more and more serious. Therefore, it is urgent to solve the problem of islanding effect, and it is of practical significance to seek a fast and effective detection method for islanding. This paper focuses on the islanding effect in single-phase low-power photovoltaic grid-connected. Firstly, this paper studies the principle of island effect, the harm it produces, the research status of island effect at home and abroad, and the detection standard of islanding effect at home and abroad. Secondly, the principle, advantages and disadvantages of active, passive and other detection methods of islanding effect are compared and analyzed. The positive feedback active frequency shift islanding detection method and the active current perturbation method have laid a theoretical foundation for islanding detection. Thirdly, the working principle, advantages and disadvantages and blind area detection range of these three methods are discussed in detail. Through M4ATLAB simulation, it is found that the output power of grid-connected inverter by active current perturbation method is greater than, When the power consumption is equal to or less than the load consumption, the isolated island state can be detected quickly, and there is no detection blind area when the inverter is running on a single unit. In this paper, STC12C5A162S chip is used to control the core circuit of islanding detection. The AC voltage, current and frequency detection circuits are designed, such as drive circuit, rectifier and filter circuit, fault detection circuit, digital tube display and control circuit, etc. The related program and control flow chart of islanding detection algorithm are compiled. Combined with software and hardware design, 1000W/220V single-phase low-power photovoltaic grid-connected power generation system is built. Under this system, single-phase grid-connected test and active current perturbation method are used to carry out islanding experiment. Finally, the full text is summarized.
【學(xué)位授予單位】：廣西大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM615

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本文編號(hào)：2161266