發(fā)布時(shí)間：2018-04-13 04:09

  本文選題：陣列分布優(yōu)化 + 模塊組合多電平變換器�。� 參考：《天津大學(xué)》2014年碩士論文

【摘要】：海洋能是一種重要的可再生能源,我國(guó)是一個(gè)海洋大國(guó),可以利用的海洋能非常豐富。海洋中波浪運(yùn)動(dòng)所蘊(yùn)含的能量密度非常高,且波浪能轉(zhuǎn)換裝置(Wave Energy Converter,WEC)的理想產(chǎn)能時(shí)間可高達(dá)90%。雖然與風(fēng)力發(fā)電、太陽(yáng)能發(fā)電等可再生能源發(fā)電相比,波浪能發(fā)電起步較晚,然而對(duì)于實(shí)現(xiàn)我國(guó)長(zhǎng)期的可再生能源發(fā)展目標(biāo)具有重要意義。隨著波浪發(fā)電技術(shù)的日趨成熟,為了實(shí)現(xiàn)波浪發(fā)電的商業(yè)化和規(guī)�；�,陣列式波浪發(fā)電場(chǎng)的建立被提上了研究日程,其優(yōu)勢(shì)是能大大節(jié)省系統(tǒng)系泊、電力傳輸和設(shè)備維護(hù)的成本,具有重要的理論和實(shí)際意義。對(duì)波浪發(fā)電場(chǎng)中的WEC單元進(jìn)行合理的位置排布可以提高波浪發(fā)電場(chǎng)的發(fā)電能力。同時(shí),還需對(duì)波浪發(fā)電陣列的電氣協(xié)調(diào)控制進(jìn)行研究,使得波浪發(fā)電場(chǎng)能穩(wěn)定平滑地輸出電能。本文針對(duì)陣列式波浪發(fā)電系統(tǒng)進(jìn)行了深入研究,主要從以下幾方面展開工作:(1)介紹了國(guó)內(nèi)外波浪能發(fā)電的發(fā)展情況及研究成果,典型波浪能發(fā)電裝置和多自由度波浪能發(fā)電裝置的原理特點(diǎn),以及陣列式波浪發(fā)電的研究情況。(2)研究陣列中波浪發(fā)電單元布局對(duì)陣列系統(tǒng)發(fā)電能力的影響。對(duì)陣列式波浪發(fā)電系統(tǒng)進(jìn)行水動(dòng)力建模,使用線性波浪理論推導(dǎo)WEC單元之間的水動(dòng)力相互作用關(guān)系。應(yīng)用MATLAB軟件對(duì)陣列系統(tǒng)的水動(dòng)力進(jìn)行分析和計(jì)算。采用拋物線交點(diǎn)法和差分進(jìn)化算法對(duì)陣列系統(tǒng)中WEC單元位置進(jìn)行優(yōu)化布局。(3)采用模塊化多電平變換器(Modular Multilevel Converter,MMC)作為陣列式波浪發(fā)電系統(tǒng)的并網(wǎng)逆變器,以提高系統(tǒng)的輸出電能質(zhì)量和適應(yīng)陣列系統(tǒng)容量的擴(kuò)展。分別在abc坐標(biāo)系和dq坐標(biāo)系下建立MMC數(shù)學(xué)模型,研究其脈沖調(diào)制技術(shù),分析MMC環(huán)流和子模塊電容電壓脈動(dòng)的成分和產(chǎn)生機(jī)理。(4)構(gòu)建了陣列式波浪發(fā)電系統(tǒng)并網(wǎng)仿真模型,并設(shè)計(jì)了相應(yīng)并網(wǎng)和直流電容電壓平衡控制器,采用直接環(huán)流抑制控制和基于PR(Proportional Resonance,PR)控制器對(duì)MMC內(nèi)部的環(huán)流進(jìn)行抑制,仿真結(jié)果驗(yàn)證了所提出控制策略的有效性。
[Abstract]:Ocean energy is an important renewable energy.The energy density of wave motion in the ocean is very high, and the ideal production time of wave Energy conversion device can be up to 90.Compared with renewable energy generation such as wind power and solar energy, wave energy power generation starts later, but it is of great significance to realize the long-term renewable energy development goal in China.With the development of wave power generation technology, in order to realize the commercialization and scale of wave power generation, the establishment of array wave electric field has been put on the research agenda, its advantage is that it can save system mooring greatly.The cost of power transmission and equipment maintenance has important theoretical and practical significance.The reasonable placement of the WEC elements in the wave field can improve the power generation capacity of the wave field.At the same time, it is necessary to study the electric coordination control of wave generator array, so that the wave electric field can output electric energy stably and smoothly.In this paper, the array wave power generation system is studied in depth, and the development and research results of wave power generation at home and abroad are introduced.The principle and characteristics of typical wave power generation devices and multi-degree-of-freedom wave power generation devices, and the research situation of array wave power generation are also discussed. (2) the influence of wave power generation unit layout in array on the generation capacity of array system is studied.The hydrodynamic model of array wave power generation system is established, and the hydrodynamic interaction between WEC elements is deduced by linear wave theory.The hydrodynamic force of array system is analyzed and calculated by MATLAB software.Using parabola intersection method and differential evolution algorithm to optimize the location of WEC cells in array systems, modularized multilevel converters (Modular Multilevel converters MMC) are used as grid-connected inverters for array wave power generation systems.In order to improve the output power quality of the system and adapt to the expansion of the capacity of the array system.The mathematical models of MMC are established in abc coordinate system and dq coordinate system respectively. The pulse modulation technology is studied, and the components and generation mechanism of MMC circulation and capacitor voltage pulsation of sub-modules are analyzed. The grid-connected simulation model of array wave power generation system is constructed.The corresponding grid-connected and DC capacitor voltage balance controller is designed. The direct circulation suppression control and the PR(Proportional Resonance PR-based controller are used to suppress the internal circulation of MMC. The simulation results verify the effectiveness of the proposed control strategy.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM46

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