基于新型H6拓?fù)涞氖须娀パa(bǔ)光儲變流器及其控制策略研究
發(fā)布時間：2018-02-13 23:16
本文關(guān)鍵詞： 光伏發(fā)電 市電互補(bǔ) 變流器 漏電流 H6拓?fù)?/strong> 出處：《安徽大學(xué)》2017年碩士論文 論文類型：學(xué)位論文
【摘要】：近年來,由于新能源產(chǎn)業(yè)的發(fā)展和世界各國政策的支持,光伏發(fā)電得到了快速的發(fā)展。光伏發(fā)電由于清潔無污染、建設(shè)成本低、獲取便捷等優(yōu)點,已被廣泛應(yīng)用于分布式發(fā)電系統(tǒng)中。目前,一些偏遠(yuǎn)山區(qū)的電網(wǎng)接入仍不穩(wěn)定,時常出現(xiàn)電網(wǎng)斷電或者異常的情況,不僅對當(dāng)?shù)氐木用裆钤斐刹槐?還會造成電氣設(shè)備的損壞。本文設(shè)計了一種基于新型H6拓?fù)涞氖须娀パa(bǔ)光儲變流器,不僅避免了電網(wǎng)斷電或異常導(dǎo)致的電氣設(shè)備無法使用或損壞的問題,而且消除了共模電壓的脈動從而有效抑制了漏電流�；谛滦虷6拓?fù)涞氖须娀パa(bǔ)光儲變流器采用兩級式非隔離結(jié)構(gòu),前級采用兩路并聯(lián)的Buck變換器,實現(xiàn)直流側(cè)光伏電池的降壓充電功能以及光伏最大功率點跟蹤控制;后級采用Buck/Boost變換器和新型H6拓?fù)?完成系統(tǒng)的整流和逆變功能。基于提出的新型H6拓?fù)涮岢隽藢?yīng)的調(diào)制策略,該調(diào)制策略改變了拓?fù)涞睦m(xù)流電流路徑,使得續(xù)流電流只經(jīng)過MOS管,不經(jīng)過通態(tài)損耗較大的體二極管,從而減小了器件的通態(tài)損耗和完全消除了二極管的反向恢復(fù)損耗,提高了變流器的工作效率。本文首先對新型市電互補(bǔ)光儲變流器的控制策略進(jìn)行了分析和比較,并對系統(tǒng)的各個部分進(jìn)行設(shè)計,包括DC/DC、DC/AC及濾波部分等。系統(tǒng)采用TMS320F28335芯片進(jìn)行軟件控制,包括MPPT控制、蓄電池充電控制、直流母線穩(wěn)壓控制及逆變器整流逆變控制等�；诒疚牡睦碚撗芯�,研制了一套5kVA市電互補(bǔ)光儲變流器實驗樣機(jī),并進(jìn)行了各項性能指標(biāo)的測試。實驗結(jié)果表明,采用本文的系統(tǒng)設(shè)計和控制策略能夠有效地抑制漏電流,并且系統(tǒng)的工作效率也大幅提高。
[Abstract]:In recent years, photovoltaic power generation has been developing rapidly because of the development of new energy industry and the support of policies around the world. Photovoltaic power generation has the advantages of clean and pollution-free, low construction cost, convenient access and so on. It has been widely used in distributed power generation systems. At present, access to power grids in some remote mountainous areas is still unstable, and power grids are often cut off or abnormal, causing inconvenience not only to the lives of local residents, but also to local residents. In this paper, a new H6 topology based complementary optical storage converter is designed, which can not only avoid the problem that the electrical equipment can not be used or damaged due to the power failure or abnormal power loss. Moreover, the pulse of common-mode voltage is eliminated and the leakage current is effectively suppressed. Based on the new H6 topology, the complementary optical storage converter adopts a two-stage non-isolated structure, and the front stage uses a two-channel parallel Buck converter. The DC side photovoltaic cell has the function of voltage down charging and the tracking control of photovoltaic maximum power point. The rear stage adopts Buck/Boost converter and a new H6 topology. Based on the proposed new H6 topology, the corresponding modulation strategy is proposed. The modulation strategy changes the current path of the topology and makes the current only pass through the MOS tube. The on-state loss of the device is reduced and the reverse recovery loss of the diode is completely eliminated without passing through the bulk diode with high on-state loss. In this paper, the control strategy of the new complementary optical storage converter is analyzed and compared, and each part of the system is designed. The system uses TMS320F28335 chip for software control, including MPPT control, battery charging control, DC bus voltage control and inverter rectifier inverter control. An experimental prototype of 5kVA complementary optical storage converter is developed, and various performance indexes are tested. The experimental results show that the leakage current can be effectively suppressed by the system design and control strategy in this paper. And the work efficiency of the system is also greatly improved.
【學(xué)位授予單位】：安徽大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM46
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