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

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

【摘要】：當今,隨著經(jīng)濟全球化和工業(yè)化進程快速發(fā)展,能源危機和環(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會消耗殆盡,因此尋找可再生能源代替化石能源是發(fā)展的趨勢,太陽能發(fā)電因以其無污染、資源豐富、可靠等優(yōu)點成為各國的必然選擇。本文以單相兩級非隔離光伏并網(wǎng)逆變器為研究對象,前級DC/DC變換器采用Boost升壓電路來實現(xiàn)最大功率點跟蹤控制,后級采用H橋逆變電路來實現(xiàn)并網(wǎng)控制。首先分析了太陽能陣列發(fā)電的原理,重點研究了太陽能電池的數(shù)學模型,并分析了幾種常用MPPT控制的原理,在此基礎上,結(jié)合PO算法,介紹了Boost電路的小信號模型,討論了PO算法的最小步長和調(diào)節(jié)時間的選取,本文最大功率點跟蹤采用恒定電壓法與自適應變步長的PO算法相結(jié)合,并通過仿真驗證,比較了自適應PO算法和定步長PO算法的優(yōu)缺點。其次研究分析了并網(wǎng)鎖相的控制策略,根據(jù)電路拓撲建立等效數(shù)學模型,在此基礎上,針對電流環(huán)采用比例積分控制不能消除穩(wěn)態(tài)誤差和重復控制因周期性延時導致系統(tǒng)動態(tài)響應慢的缺點,本文電流環(huán)采用重復與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進行仿真驗證,得出PI控制與重復控制和魯棒控制與重復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。然后設計了單相光伏硬件系統(tǒng),并對硬件參數(shù)進行計算,主要包括開關管的選型、濾波電路、驅(qū)動電路、保護電路、檢測電路、緩沖電路等參數(shù)設計等,控制器的控制芯片選為TI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)理論計算搭建了實驗樣機,驗證了硬件電路和控制算法的可行性,測試結(jié)果表明樣機運行穩(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.

【學位授予單位】：湖北工業(yè)大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TM464

【參考文獻】

相關期刊論文 前10條

1 王萍;刁長玉;張景濱;丁輝;;基于虛擬電阻的重復控制算法在逆變電源中的應用[J];天津大學學報(自然科學與工程技術版);2014年07期

2 陳燕東;羅安;周樂明;謝寧;金國彬;呂志鵬;;一種功率前饋的魯棒預測無差拍并網(wǎng)控制方法[J];中國電機工程學報;2013年36期

3 宋亮;王曉東;劉雯;徐銳;楊富華;;光伏電池MPPT擾動觀察法的研究現(xiàn)狀[J];半導體光電;2012年04期

4 楊永恒;周克亮;;光伏電池建模及MPPT控制策略[J];電工技術學報;2011年S1期

5 楊恢宏;沈定坤;蔣懷貞;翟登輝;;基于改進鎖相環(huán)的單相光伏并網(wǎng)逆變器研制[J];電力電子技術;2011年07期

6 王新勇;許煒;汪顯博;范波;;光伏并網(wǎng)逆變器空間電壓矢量雙滯環(huán)電流控制新策略[J];電力系統(tǒng)保護與控制;2011年10期

7 吳海濤;孫以澤;孟Ze;;粒子群優(yōu)化模糊控制器在光伏發(fā)電系統(tǒng)最大功率跟蹤中的應用[J];中國電機工程學報;2011年06期

8 王斯然;呂征宇;;LCL型并網(wǎng)逆變器中重復控制方法研究[J];中國電機工程學報;2010年27期

9 董密;楊建;彭可;羅安;;光伏系統(tǒng)的零均值電導增量最大功率點跟蹤控制[J];中國電機工程學報;2010年21期

10 周雪松;宋代春;馬幼捷;程德樹;;光伏發(fā)電系統(tǒng)的并網(wǎng)重復控制及仿真[J];電力電子技術;2010年05期

相關碩士學位論文 前1條

1 刁元均;基于DSP的逆變電源數(shù)字控制技術的研究[D];西南交通大學;2007年

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