發(fā)布時(shí)間：2018-02-22 21:52

  本文關(guān)鍵詞： 交錯(cuò)并聯(lián)反激微逆變器 非互補(bǔ)式有源鉗位電路 控制策略優(yōu)化　出處：《電子科技大學(xué)》2014年碩士論文　論文類型：學(xué)位論文

【摘要】：全球經(jīng)濟(jì)的快速發(fā)展,引發(fā)了嚴(yán)重的能源危機(jī)和環(huán)境問(wèn)題,太陽(yáng)能光伏發(fā)電以其清潔環(huán)保、資源廣泛的優(yōu)點(diǎn)成為研究熱點(diǎn)。傳統(tǒng)集中式光伏并網(wǎng)發(fā)電系統(tǒng)中,光伏模塊通過(guò)串并聯(lián)形式獲得足夠大的電壓和功率,其最大功率點(diǎn)跟蹤針對(duì)的是整個(gè)光伏組串,從而導(dǎo)致單個(gè)光伏模塊與光伏逆變器之間存在能量不匹配問(wèn)題,并造成了較大的電能損耗。為克服上述不足,國(guó)內(nèi)外專家提出了微逆變器方案,微逆變器與單個(gè)光伏模塊相連,能夠?qū)崿F(xiàn)單模塊級(jí)的MPPT,有效減小電能損耗,成為光伏發(fā)電的一個(gè)研究方向及熱點(diǎn)。微逆變器是連接光伏模塊與電網(wǎng)的樞紐,既要保證光伏模塊以最大功率輸出電能,又要保證向電網(wǎng)輸出高品質(zhì)電能,同時(shí)要求并網(wǎng)電流的功率因數(shù)、電流諧波滿足光伏并網(wǎng)標(biāo)準(zhǔn),因此,選擇高效的拓?fù)浣Y(jié)構(gòu)及控制系統(tǒng)至關(guān)重要。本文設(shè)計(jì)采用兩級(jí)拓?fù)浣Y(jié)構(gòu),前級(jí)為交錯(cuò)并聯(lián)反激電路,反激電路具有結(jié)構(gòu)簡(jiǎn)單、穩(wěn)定性好、效率高等優(yōu)點(diǎn),交錯(cuò)并聯(lián)結(jié)構(gòu)可以提高功率等級(jí)并減小電流紋波;后級(jí)全橋逆變?yōu)楣ゎl逆變,可以有效減小開關(guān)損耗。本文在分析了交錯(cuò)并聯(lián)反激微逆變器的工作原理的基礎(chǔ)上,詳細(xì)設(shè)計(jì)了主功率電路和非互補(bǔ)式有源鉗位電路,并完成相關(guān)電路參數(shù)設(shè)計(jì)及器件選型;然后根據(jù)功能需求和拓?fù)浣Y(jié)構(gòu),研究設(shè)計(jì)了相應(yīng)的控制系統(tǒng),主要包括系統(tǒng)控制流程、并網(wǎng)電流控制算法和均流控制算法等,并通過(guò)仿真驗(yàn)證了控制算法的可行性;最后設(shè)計(jì)了一款250W的微逆變器樣機(jī),并完成相關(guān)實(shí)驗(yàn)測(cè)試。為了進(jìn)一步減小損耗、提高微逆變器的效率,本文對(duì)交錯(cuò)并聯(lián)反激微逆變器的控制策略進(jìn)行了優(yōu)化研究。為了減小有源鉗位電路的損耗,本文研究設(shè)計(jì)了基于反激主開關(guān)管電壓的優(yōu)化控制策略;為了減小半載及輕載時(shí)微逆變器的損耗,本文研究設(shè)計(jì)了基于輸出有功功率的優(yōu)化控制策略;為了減小全負(fù)載范圍內(nèi)微逆變器的損耗,本文研究設(shè)計(jì)了基于瞬時(shí)輸出功率的優(yōu)化控制策略。并通過(guò)仿真驗(yàn)證了優(yōu)化控制策略的可行性。
[Abstract]:The rapid development of global economy has caused serious energy crisis and environmental problems. Solar photovoltaic power generation with its advantages of clean, environmental protection and extensive resources has become a research hotspot. The photovoltaic module obtains enough voltage and power by series-parallel connection, and its maximum power point tracking is aimed at the whole photovoltaic cluster, which leads to the problem of energy mismatch between a single photovoltaic module and a photovoltaic inverter. In order to overcome the above shortcomings, experts at home and abroad put forward a micro-inverter scheme, which is connected to a single photovoltaic module, and can achieve single-module MPPTT, which can effectively reduce the power loss. Microinverters are the key link between photovoltaic module and power grid. It is not only to ensure the photovoltaic module to output electricity with maximum power, but also to ensure the output of high quality power to the power grid. At the same time, the power factor and current harmonic of grid-connected current are required to meet the standard of photovoltaic grid-connected. Therefore, it is very important to select efficient topology and control system. In this paper, the two-stage topology structure is adopted, and the front stage is staggered parallel flyback circuit. The flyback circuit has the advantages of simple structure, good stability and high efficiency. The staggered parallel structure can improve the power level and reduce the current ripple. Based on the analysis of the working principle of the interleaved parallel flyback micro-inverter, the main power circuit and the non-complementary active clamp circuit are designed in detail, and the related circuit parameter design and device selection are completed. Then according to the functional requirements and topology, the corresponding control system is designed, including system control flow, grid-connected current control algorithm and current sharing control algorithm, and the feasibility of the control algorithm is verified by simulation. Finally, a 250W micro-inverter prototype is designed, and the related experiments are completed. In order to further reduce the loss and improve the efficiency of the micro-inverter, In order to reduce the loss of the active clamping circuit, the optimal control strategy based on the flyback main switch voltage is designed in this paper, in order to reduce the loss of the active clamp circuit, the control strategy of the interleaved parallel flyback micro-inverter is optimized. In order to reduce the loss of the micro-inverter under half load and light load, the optimal control strategy based on the output active power is designed in this paper, and the loss of the micro-inverter in the full load range is reduced. In this paper, the optimal control strategy based on instantaneous output power is designed, and the feasibility of the optimal control strategy is verified by simulation.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464

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本文編號(hào)：1525397