【摘要】：進(jìn)入二十一世紀(jì)以來,石油價格日趨上漲,全球能源供應(yīng)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(guān)鍵技術(shù)的發(fā)展也會起到更大的推進(jìn)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(diǎn)。 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(diào)制方式為基礎(chǔ),并網(wǎng)DG采用最大功率跟蹤的PQ電流解耦與PI控制相結(jié)合的控制方法,對組網(wǎng)DG的控制以下垂控制為基礎(chǔ),通過引入下垂額定點(diǎn)調(diào)整環(huán)實(shí)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(diǎn)。列舉并對比了國內(nèi)外光伏并網(wǎng)標(biāo)準(zhǔn),簡要介紹了最大功率點(diǎn)跟蹤方法,并對本文采用的擾動觀察法進(jìn)行了仿真驗證。 其次,設(shè)計了電壓外環(huán)電流內(nèi)環(huán)及PI控制相結(jié)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(shí)現(xiàn)與電網(wǎng)電壓的同頻同相,進(jìn)而保障了有功功率的全負(fù)荷輸出。本文搭建了由組網(wǎng)DG和并網(wǎng)DG構(gòu)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(yùn)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(jìn)行補(bǔ)償以改善無功環(huán)流問題。通過對控制方式切換,可使DG運(yùn)行在不同工作模式下。 最后,設(shè)計了基于DSP的光伏并網(wǎng)系統(tǒng)的硬件,并設(shè)計了相關(guān)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(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：TM615

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本文編號：2378083