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  本文關鍵詞：直流微電網(wǎng)能量優(yōu)化控制研究　出處：《西南交通大學》2014年碩士論文　論文類型：學位論文

  更多相關文章： 直流微電網(wǎng) 最大功率點跟蹤 母線能量優(yōu)化控制

【摘要】：最近幾年,世界范圍內(nèi)連續(xù)發(fā)生了幾次造成重大影響的停電事故,這充分地暴露了大電網(wǎng)的脆弱性。分布式發(fā)電(Distributed Generation, DG)的種種優(yōu)勢使其得以成為電力系統(tǒng)的發(fā)展趨勢之一,但它還存在許多問題,如單機接入成本較高、控制難度較大等。為了減小DG對大電網(wǎng)的沖擊,需要在使用時對DG進行限制或隔離等處理,因此DG效能的充分發(fā)揮受到了嚴重的限制。研究人員提出了微電網(wǎng)這一概念,希望以此來協(xié)調(diào)大電網(wǎng)與DG之間的沖突、充分利用DG。 微電網(wǎng)通過將微電源、負荷、儲能設備和控制裝置整合起來,形成可控、獨立的供電系統(tǒng),充分利用系統(tǒng)中的DG,其運行模式靈活,但控制策略上有較高要求。微電網(wǎng)具有雙重作用,對大型電力網(wǎng)絡來說,它被當做一個以數(shù)秒速度響應外部網(wǎng)絡能量需求的可控單元；另一方面,從用戶角度來說,微電網(wǎng)可以滿足不同用戶對電能的特殊需求,提供多樣化的電能。 本文研究了DG最大功率點跟蹤、蓄電池雙向DC/DC變換器控制以及直流母線能量優(yōu)化控制三個方面。主要工作有： 1、基于風力發(fā)電Matlab仿真模型,分析了風力發(fā)電機的輸出特性,并采用占空比擾動法實現(xiàn)了風力發(fā)電的最大功率跟隨。 2、基于光伏電池Matlab仿真模型,仿真驗證該模型可以準確地模擬光伏電池的輸出特性。提出一種基于功率預測的變步長擾動最大功率點跟蹤方法,并仿真驗證其有效性。 3、基于蓄電池充放電Matlab仿真模型,仿真驗證雙向DC/DC變換器充放電控制策略。 4、提出了一種直流母線能量的優(yōu)化利用方法,通過協(xié)調(diào)控制各微源工作在最大功率點跟蹤模式或母線電壓跟蹤模式來提高母線能量利用效率,以風光聯(lián)合發(fā)電系統(tǒng)為例進行了仿真驗證,并與各微源獨立進行最大功率點跟蹤對比,驗證了該方法的有效性。
[Abstract]:In recent years, the world has undergone several times affect the power outage, this fully exposed the vulnerability of large power grid. Distributed generation (Distributed Generation, DG) of the various advantages to enable it to become one of the development trend of the power system, but it also has many problems, such as the high cost of computer access it is difficult to control, and so on. In order to reduce the impact of DG on power grid, to restrict or isolation of DG DG in use, so its efficiency is limited seriously. The researchers put forward the concept of micro grid, hoping to coordinate the conflict between the grid and DG, make full use of DG.
Micro power grid through the micro power, load, energy storage device and control device are integrated to form a controllable, independent power supply system, make full use of DG system, its operation mode is flexible, but the control strategy has high requirements. The micro grid has a dual role of large power network, it is used as a the number of seconds the response speed controllable energy demand of the external network; on the other hand, from the user perspective, the micro grid can meet the special needs of different users of electricity, offers a variety of electrical energy.
In this paper, the maximum power point tracking of DG, the control of bi-directional DC/DC converter and the optimal control of the DC bus energy are studied in three aspects.
1, based on the Matlab simulation model of wind power generation, the output characteristics of the wind generator are analyzed and the maximum power following of the wind power generation is realized by the duty cycle method.
2, based on the photovoltaic cell Matlab simulation model, simulation results show that the proposed model can accurately simulate the output characteristics of PV cells. A variable step size disturbance maximum power point tracking method based on power prediction is proposed, and its effectiveness is verified by simulation.
3, based on the Matlab simulation model of battery charging and discharging, simulation and verification of the charge and discharge control strategy of bidirectional DC/DC converter.
4, we propose an optimized DC bus energy utilization method, through the micro source tracking mode or voltage tracking mode to improve the bus energy efficiency at the maximum power point control, the scenery combined generation system is validated, and the micro source of independent of the maximum power point tracking contrast. To verify the effectiveness of the method.

【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TM727

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相關期刊論文 前10條

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本文編號：1393246