【摘要】：進入二十一世紀以來,石油價格日趨上漲,全球能源供應持續(xù)緊張,怎樣合理開發(fā)和有效的利用綠色能源已經(jīng)成為全世界迫在眉睫的重要課題。太陽能作為一種綠色能源正在逐漸發(fā)揮出它的優(yōu)勢,光伏發(fā)電并網(wǎng)關鍵技術的發(fā)展也會起到更大的推進作用。光伏電源大量接入對電網(wǎng)帶來了諸多不良影響,微網(wǎng)系統(tǒng)的出現(xiàn)可以緩解這一問題,因而成為了各國的研究熱點。 本文以三相光伏發(fā)電系統(tǒng)的控制策略為研究對象,以SVPWM調制方式為基礎,并網(wǎng)DG采用最大功率跟蹤的PQ電流解耦與PI控制相結合的控制方法,對組網(wǎng)DG的控制以下垂控制為基礎,通過引入下垂額定點調整環(huán)實現(xiàn)對組網(wǎng)DG的PQ控制,并完成了兩種控制的平滑切換。 首先,本文分析了具有不同陣列形式的光伏發(fā)電系統(tǒng)優(yōu)缺點。列舉并對比了國內外光伏并網(wǎng)標準,簡要介紹了最大功率點跟蹤方法,并對本文采用的擾動觀察法進行了仿真驗證。 其次,設計了電壓外環(huán)電流內環(huán)及PI控制相結合的并網(wǎng)DG控制模式,可使得電流波形具有更好的穩(wěn)定性,諧波含量更少,逆變器輸出電流可以實現(xiàn)與電網(wǎng)電壓的同頻同相,進而保障了有功功率的全負荷輸出。本文搭建了由組網(wǎng)DG和并網(wǎng)DG構成的微網(wǎng)系統(tǒng),仿真驗證了微網(wǎng)系統(tǒng)能夠穩(wěn)定運行。針對無功環(huán)流問題,本文采用在下垂控制中對線路壓降進行補償以改善無功環(huán)流問題。通過對控制方式切換,可使DG運行在不同工作模式下。 最后,設計了基于DSP的光伏并網(wǎng)系統(tǒng)的硬件,并設計了相關軟件流程圖。
[Abstract]:Since entering the 21 century, the oil price is rising day by day, the global energy supply continues to be tight, how to rationally develop and utilize the green energy effectively has become an urgent and important issue all over the world. As a kind of green energy, solar energy is gradually exerting its advantages, and the development of key technology of photovoltaic power grid will play a more important role. A large number of photovoltaic power supply access to the grid has brought a lot of adverse effects, the emergence of micro-grid systems can alleviate this problem, so it has become a research hotspot around the world. In this paper, the control strategy of the three-phase photovoltaic power generation system is studied. Based on the SVPWM modulation mode, the grid-connected DG adopts the maximum power tracking PQ current decoupling and PI control method. The control of DG is based on droop control, and the PQ control of DG is realized by introducing droop rating adjustment loop, and the smooth switching of two kinds of control is completed. Firstly, the advantages and disadvantages of photovoltaic power generation systems with different arrays are analyzed. The domestic and foreign photovoltaic grid-connected standards are listed and compared, the maximum power point tracking method is briefly introduced, and the perturbation observation method used in this paper is simulated and verified. Secondly, the grid-connected DG control mode combining voltage outer loop current inner loop and PI control is designed, which makes the current waveform have better stability, less harmonic content, and the output current of inverter can realize the same frequency and phase with the grid voltage. Thus, the full load output of active power is guaranteed. In this paper, a microgrid system composed of networked DG and grid-connected DG is built, and the simulation results show that the microgrid system can run stably. In order to improve the reactive circulation problem, the voltage drop of the line is compensated in droop control. By switching the control mode, the DG can run in different working modes. Finally, the hardware of photovoltaic grid-connected system based on DSP is designed, and the related software flow chart is designed.
【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】：TM615

【參考文獻】

相關期刊論文 前10條

1 石新春;陳雷;趙艷軍;張玉平;;基于DSP2407的三相光伏并網(wǎng)控制器的仿真與實驗研究[J];電氣應用;2009年04期

2 王成山;肖朝霞;王守相;;微網(wǎng)綜合控制與分析[J];電力系統(tǒng)自動化;2008年07期

3 張承慧,潘世英;通用變頻器檢測與保護電路的設計[J];電氣傳動;2005年03期

4 王仁祥;王小曼;;終端用戶分布式新能源接入智能配電網(wǎng)技術研究[J];電氣技術;2010年08期

5 孫奇;;基于DSP的光伏并網(wǎng)發(fā)電系統(tǒng)的設計[J];科技信息;2010年01期

6 張成;王心堅;衣鵬;孫澤昌;;SVPWM與SPWM比較仿真研究[J];機械與電子;2013年01期

7 徐耀;;基于DSP2407的單相軟件鎖相環(huán)的實現(xiàn)[J];通信電源技術;2010年06期

8 陳波;李果;楊勝輝;蘇楚研;;新能源發(fā)電與電能質量問題淺析[J];電網(wǎng)與清潔能源;2012年06期

9 劉燕華;張楠;趙冬梅;;國內外光伏并網(wǎng)標準中電能質量相關規(guī)范對比與分析[J];現(xiàn)代電力;2011年06期

10 劉萬明;謝華;;基于DSP控制的光伏并網(wǎng)發(fā)電系統(tǒng)設計[J];電子元器件應用;2009年07期

，

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