本文選題：交錯(cuò)并聯(lián) + 準(zhǔn)諧振　； 參考：《浙江大學(xué)》2016年碩士論文

【摘要】：光伏產(chǎn)業(yè)當(dāng)下發(fā)展迅猛,光伏產(chǎn)品的效率與成本仍是兩個(gè)不可忽視的問題。由于光伏組件的輸出呈非線性,并且其開路電壓短路電流等關(guān)鍵參數(shù)也會(huì)隨溫度、輻射照度等環(huán)境因素而改變,尤其是民用、商用級(jí)產(chǎn)品,非常容易受到局部環(huán)境光遮蔽等因素的影響,因此針對(duì)由光伏組件組成的光伏陣列的最大功率點(diǎn)追蹤,保持較高的效率與較低的成本是個(gè)難題。本文首先分析了光伏組件的特性,總結(jié)了幾種常用的MPPT控制算法,然后從效率和控制器成本的角度分析了光伏陣列的分布式MPPT控制方案。針對(duì)分布式MPPT控制方案在DSP、傳感器方面的高成本問題,基于交錯(cuò)并聯(lián)flyback變流器,提出了一種新的基于導(dǎo)通時(shí)間的MPPT控制方案,可以僅采樣輸入電壓而不需要電流傳感器,進(jìn)行功率計(jì)算,使用一片TMS320F28035實(shí)現(xiàn)每個(gè)模塊式光伏陣列子系統(tǒng)的MPPT,既能實(shí)現(xiàn)MPPT的追蹤,應(yīng)對(duì)局部環(huán)境光遮蔽,又能節(jié)約成本。為了減輕變流器輸入輸出電容的濾波壓力,本文將交錯(cuò)技術(shù)應(yīng)用于flyback電路。為提高變流器效率,對(duì)硬件和軟件進(jìn)行了設(shè)計(jì),使flyback工作于準(zhǔn)諧振軟開關(guān)狀態(tài)。DSP選用了TMS320F28035,具有CLA協(xié)處理器,支持浮點(diǎn)運(yùn)算和雙核并行運(yùn)算。經(jīng)過硬件和軟件的詳細(xì)設(shè)計(jì),搭建了仿真和實(shí)驗(yàn)平臺(tái),基于TMS320F28035編寫了多核并行控制程序,通過仿真和實(shí)驗(yàn),實(shí)現(xiàn)了基本功能,最終驗(yàn)證了電路設(shè)計(jì)、控制策略的可行性。
[Abstract]:With the rapid development of photovoltaic industry, the efficiency and cost of photovoltaic products are still two problems that can not be ignored. Because the output of PV module is nonlinear, and the key parameters such as open circuit voltage, short circuit current and so on will change with environmental factors such as temperature, illuminance and so on, especially for civilian and commercial grade products. Therefore, it is difficult to keep high efficiency and low cost for the maximum power point tracking of photovoltaic arrays composed of photovoltaic modules. This paper first analyzes the characteristics of photovoltaic modules, summarizes several common MPPT control algorithms, and then analyzes the distributed MPPT control scheme of photovoltaic arrays from the point of view of efficiency and controller cost. Aiming at the high cost of distributed MPPT control scheme in DSP sensor, a new MPPT control scheme based on on-time is proposed based on staggered parallel flyback converter, which can only sample input voltage without requiring current sensor. For power calculation, the MPPTs of each module photovoltaic array subsystem can be realized by using a piece of TMS320F28035, which can not only realize the tracking of MPPT, but also save the cost of local environmental light masking. In order to reduce the filter pressure of input and output capacitance of converter, this paper applies interleaving technique to flyback circuit. In order to improve the efficiency of the converter, the hardware and software are designed. The TMS320F28035 is selected to work in the quasi resonant soft switching state. The TMS320F28035 is used to support the floating-point operation and dual-core parallel operation. Through the detailed design of hardware and software, the simulation and experiment platform is built, and the multi-core parallel control program based on TMS320F28035 is written. Through simulation and experiment, the basic functions are realized. Finally, the feasibility of circuit design and control strategy is verified.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：TM615

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