本文關(guān)鍵詞：基于SiC的光伏并網(wǎng)逆變器的研究　出處：《湖北工業(yè)大學(xué)》2017年碩士論文　論文類(lèi)型：學(xué)位論文

  更多相關(guān)文章： 光伏并網(wǎng)逆變器 最大功率點(diǎn) 重復(fù)控制 比例積分控制 碳化硅

【摘要】：當(dāng)今,隨著經(jīng)濟(jì)全球化和工業(yè)化進(jìn)程快速發(fā)展,能源危機(jī)和環(huán)境污染是制約可持續(xù)發(fā)展的兩大重要因素,而且,可利用的化石能源在不久的將來(lái)會(huì)消耗殆盡,因此尋找可再生能源代替化石能源是發(fā)展的趨勢(shì),太陽(yáng)能發(fā)電因以其無(wú)污染、資源豐富、可靠等優(yōu)點(diǎn)成為各國(guó)的必然選擇。本文以單相兩級(jí)非隔離光伏并網(wǎng)逆變器為研究對(duì)象,前級(jí)DC/DC變換器采用Boost升壓電路來(lái)實(shí)現(xiàn)最大功率點(diǎn)跟蹤控制,后級(jí)采用H橋逆變電路來(lái)實(shí)現(xiàn)并網(wǎng)控制。首先分析了太陽(yáng)能陣列發(fā)電的原理,重點(diǎn)研究了太陽(yáng)能電池的數(shù)學(xué)模型,并分析了幾種常用MPPT控制的原理,在此基礎(chǔ)上,結(jié)合PO算法,介紹了Boost電路的小信號(hào)模型,討論了PO算法的最小步長(zhǎng)和調(diào)節(jié)時(shí)間的選取,本文最大功率點(diǎn)跟蹤采用恒定電壓法與自適應(yīng)變步長(zhǎng)的PO算法相結(jié)合,并通過(guò)仿真驗(yàn)證,比較了自適應(yīng)PO算法和定步長(zhǎng)PO算法的優(yōu)缺點(diǎn)。其次研究分析了并網(wǎng)鎖相的控制策略,根據(jù)電路拓?fù)浣⒌刃?shù)學(xué)模型,在此基礎(chǔ)上,針對(duì)電流環(huán)采用比例積分控制不能消除穩(wěn)態(tài)誤差和重復(fù)控制因周期性延時(shí)導(dǎo)致系統(tǒng)動(dòng)態(tài)響應(yīng)慢的缺點(diǎn),本文電流環(huán)采用重復(fù)與PI并聯(lián)的控制和魯棒控制,并給出了控制框圖,分別利用Matlab/Simulink進(jìn)行仿真驗(yàn)證,得出PI控制與重復(fù)控制和魯棒控制與重復(fù)控制能顯著性的改善注入電網(wǎng)電流的THD,抑制系統(tǒng)低頻諧波。然后設(shè)計(jì)了單相光伏硬件系統(tǒng),并對(duì)硬件參數(shù)進(jìn)行計(jì)算,主要包括開(kāi)關(guān)管的選型、濾波電路、驅(qū)動(dòng)電路、保護(hù)電路、檢測(cè)電路、緩沖電路等參數(shù)設(shè)計(jì)等,控制器的控制芯片選為T(mén)I公司的DSP2812,軟件主要包含主程序、AD采樣程序、電網(wǎng)頻率捕獲程序、逆變程序等。最后根據(jù)理論計(jì)算搭建了實(shí)驗(yàn)樣機(jī),驗(yàn)證了硬件電路和控制算法的可行性,測(cè)試結(jié)果表明樣機(jī)運(yùn)行穩(wěn)定,安全可靠,有良好的性能,并網(wǎng)電流質(zhì)量好。
[Abstract]:Nowadays, with the rapid development of economic globalization and industrialization, the energy crisis and environmental pollution are two important factors restricting the sustainable development and use of fossil energy will be exhausted in the near future, so looking for renewable energy instead of fossil energy is the development trend of solar power generation due to its non pollution, abundant resources. The advantages of reliable become an inevitable choice. Based on the single phase two stage transformerless PV grid connected inverter as the research object, the DC/DC converter uses Boost circuit to achieve maximum power point tracking control, after using H bridge inverter circuit to realize grid control. This paper analyzes the principle of solar array power, focus on the mathematical model of the solar cell, and analyzes the principle of several commonly used MPPT control, on this basis, combined with the PO algorithm, the small signal Boost circuit The model, discussed the minimum step size PO algorithm and adjusting time of selection, the maximum power point tracking PO algorithm using the constant voltage method with variable step size adaptive combination, and through the simulation, comparing the advantages and disadvantages of adaptive PO algorithm and fixed step PO algorithm. Then study the control strategy of grid connected phase, according to the the establishment of mathematical model of equivalent circuit topology, on this basis, according to the current loop proportional integral control and repetitive control is not due to periodic delay lead to the shortcomings of slow dynamic response of the current loop to eliminate the steady-state error control and robust control and PI parallel with repetition, and gives the control diagram, respectively using Matlab/Simulink simulation come, PI control and repetitive control and robust control and repetitive control can significantly improve the current injected into the power system of THD, and then set the low frequency harmonic suppression system. The single-phase photovoltaic hardware system, and the hardware parameters, including switch selection, filter circuit, drive circuit, protection circuit, detection circuit, buffer circuit parameter design, control chip controller is selected as TI, DSP2812, software mainly includes the main program, AD sampling procedures, power grid frequency acquisition procedures, procedures and so on. Finally, the inverter experimental prototype is built based on the theoretical calculation, to verify the feasibility of hardware circuit and control algorithm, test results show that the prototype is stable, safe and reliable, has a good performance, and the current network of good quality.

【學(xué)位授予單位】：湖北工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM464

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