本文關(guān)鍵詞：單相光伏逆變器并離網(wǎng)控制系統(tǒng)設(shè)計　出處：《溫州大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 并網(wǎng)逆變器 并離網(wǎng)切換 鎖相環(huán) 孤島檢測 最大功率跟蹤

【摘要】：分布光伏并網(wǎng)發(fā)電系統(tǒng)近年來發(fā)展迅速,并網(wǎng)逆變器作為分布式發(fā)電系統(tǒng)與電網(wǎng)的接口電路得到了廣泛的應(yīng)用。為保證本地敏感負(fù)載的供電可靠性,分布式并網(wǎng)逆變器一般具并網(wǎng)運行模式和離網(wǎng)獨立運行模式,因此逆變器在兩種模式之間的無縫切換,保證本地負(fù)載供電的連續(xù)性成為一大難題。本文正是針對上述難題,設(shè)計了單相光伏逆變器的并離網(wǎng)控制系統(tǒng)。(1)本文分析了國內(nèi)外光伏發(fā)電的發(fā)展趨勢。光伏發(fā)電作為一種新型的可再生能源,其具有的一系列特殊優(yōu)勢以及廣泛的應(yīng)用前景。闡述了并離網(wǎng)無縫切換概念,總結(jié)了目前國內(nèi)外針對并網(wǎng)離切換研究的難點與熱點。(2)針對單相逆變器拓?fù)浣Y(jié)構(gòu),建立了逆變器并網(wǎng)運行模式和離網(wǎng)獨立運行模式的數(shù)學(xué)模型,并在此基礎(chǔ)上提出了相對應(yīng)的控制策略。設(shè)計了一種改進的離散比例諧振控(DPR)制器,論證了該控制器在離散域到交流參考信號跟蹤的無差性。(3)提出了針對單相并離網(wǎng)系統(tǒng)的軟件閉環(huán)鎖相方法與孤單檢測方法。設(shè)計了一種改進的單相閉環(huán)鎖相方法,論證了該鎖相方法中生成的正交性號具有無差性。(4)針對逆變器在雙模式之間切換時存在的各種問題,設(shè)計了一種并離網(wǎng)無縫切換方法,并給出了逆變器詳細(xì)的切換流程。(5)針對目前各種光伏電池最大功率跟蹤(MPPT)算法的優(yōu)勢與缺陷,提出了兩級式光伏逆變系統(tǒng)在并離網(wǎng)雙模式下的前后級控制策略。最后,通過實驗平臺測試結(jié)果分析,表明本文設(shè)計的控制系統(tǒng)能夠?qū)崿F(xiàn)并網(wǎng)逆變器并網(wǎng)運行模式與離網(wǎng)獨立運行模式之間的無縫切換,保證本地負(fù)載在逆變器兩種模式切換過程中的連續(xù)供電,滿足設(shè)計需求。
[Abstract]:Distributed photovoltaic grid-connected generation system has been developed rapidly in recent years. Grid-connected inverter is widely used as the interface circuit between distributed generation system and power grid to ensure the reliability of local sensitive load. Distributed grid-connected inverter generally has grid-connected operation mode and off-grid independent operation mode, so the inverter switches seamlessly between the two modes. To ensure the continuity of local load power supply has become a major problem. This paper analyzes the development trend of photovoltaic power generation at home and abroad. Photovoltaic power generation as a new type of renewable energy. It has a series of special advantages and wide application prospects. This paper summarizes the difficulties and hotspots in the research of grid-connected and off-grid switching at home and abroad. Aiming at the topology of single-phase inverter, the mathematical models of grid-connected operation mode and off-grid independent operation mode are established. Based on this, a corresponding control strategy is proposed and an improved discrete proportional resonance control (DPRR) controller is designed. It is proved that there is no difference between the controller and AC reference signal tracking in discrete domain. A software closed-loop phase-locking method and a lonely detection method for single-phase parallel and off-grid systems are proposed, and an improved single-phase closed-loop phase-locking method is designed. It is demonstrated that the orthogonality number generated in this phase-locked method has no difference. (4) aiming at the problems existing in switching between two modes of inverter, a seamless switching method is designed. A detailed switching flow of the inverter. 5) aiming at the advantages and disadvantages of various MPPTs for maximum power tracking of photovoltaic cells is given. The control strategy of two-stage photovoltaic inverter system in parallel and off-grid dual-mode is proposed. Finally, the test results are analyzed by the experimental platform. It shows that the control system designed in this paper can realize seamless switching between grid-connected inverter grid-connected operation mode and off-grid independent operation mode, and ensure the continuous supply of local load in the switching process of two modes of inverter. Meet design requirements.
【學(xué)位授予單位】：溫州大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TM464;TP273

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