本文選題：光伏發(fā)電 + 逆變器��； 參考：《遼寧工業(yè)大學(xué)》2014年碩士論文

【摘要】：隨著能源和環(huán)境問(wèn)題越來(lái)越突出，光伏發(fā)電作為一種戰(zhàn)略性新興產(chǎn)業(yè)，得到了快速發(fā)展。光伏發(fā)電系統(tǒng)的并網(wǎng)問(wèn)題是當(dāng)今光伏發(fā)電研究的熱門方向之一，隨著社會(huì)的發(fā)展和用電量需求的增加，許多負(fù)載設(shè)備對(duì)功率容量的要求越來(lái)越大，由于單模塊逆變器的擴(kuò)充性和可靠性在實(shí)際應(yīng)用當(dāng)中會(huì)受到很大的限制，所以設(shè)計(jì)多模塊逆變器并聯(lián)再并網(wǎng)發(fā)電顯得尤為重要。 對(duì)于逆變器并聯(lián)均流控制的方法，過(guò)去已經(jīng)提出了許多具有不同復(fù)雜程度和均流性能的控制方法。由系統(tǒng)中各模塊是否需要通過(guò)互連線進(jìn)行通信，可劃分為有線并聯(lián)控制方式和無(wú)互連線并聯(lián)控制方式。隨著逆變器并聯(lián)技術(shù)的迅速發(fā)展和不斷成熟，高可靠性、高冗余度、智能化控制是主要發(fā)展方向，相對(duì)于有互連線并聯(lián)系統(tǒng)來(lái)說(shuō)，無(wú)互連線并聯(lián)由于各模塊之間不需要信號(hào)的傳輸線而大大提高了抗干擾能力和可靠性。目前常用的無(wú)線并聯(lián)控制方式為下垂法，通過(guò)調(diào)整輸出功率來(lái)調(diào)節(jié)模塊輸出電壓。 首先介紹了目前各國(guó)能源問(wèn)題的現(xiàn)狀，引出太陽(yáng)能發(fā)電的意義和發(fā)展空間，進(jìn)一步分析光伏逆變器對(duì)于光伏發(fā)電系統(tǒng)的重要性。詳細(xì)研究了逆變器的主電路結(jié)構(gòu)和工作原理。 其次通過(guò)仿真模型的建立，分析并聯(lián)系統(tǒng)環(huán)流產(chǎn)生的原因，并對(duì)無(wú)并聯(lián)控制策略的雙閉環(huán)控制逆變器并聯(lián)系統(tǒng)進(jìn)行仿真分析，通過(guò)仿真結(jié)果得出控制參數(shù)對(duì)并聯(lián)系統(tǒng)均流性能的影響。 然后分析分布式控制策略對(duì)并聯(lián)系統(tǒng)均流效果的調(diào)節(jié)作用，通過(guò)公式的推導(dǎo)和仿真實(shí)驗(yàn)的結(jié)果得出分布式并聯(lián)控制策略可以很好的抑制系統(tǒng)環(huán)流，并改善電路的穩(wěn)態(tài)和動(dòng)態(tài)性能。 最后引入了雙環(huán)控制逆變器并聯(lián)系統(tǒng)的下垂法控制策略，通過(guò)分析并聯(lián)逆變器的環(huán)流特征，對(duì)采用傳統(tǒng)下垂法的并聯(lián)系統(tǒng)進(jìn)行仿真，結(jié)果表明傳統(tǒng)下垂法能夠?qū)崿F(xiàn)均流和功率均分，，但同時(shí)也會(huì)使系統(tǒng)的輸出特性變軟。進(jìn)一步分析可知引入功率的微分項(xiàng)可以改善輸出外特性和系統(tǒng)的動(dòng)態(tài)性能。
[Abstract]:As energy and environmental problems become more and more prominent, photovoltaic power generation as a strategic emerging industry, has been rapid development.The grid-connected problem of photovoltaic power generation system is one of the hot research directions of photovoltaic power generation nowadays. With the development of society and the increasing demand for electricity consumption, many load equipments require more and more power capacity.Because the expansibility and reliability of single-module inverter will be limited in practical application, it is very important to design multi-module inverter in parallel and connected to grid.For the parallel current sharing control of inverter, many control methods with different complexity and current sharing performance have been put forward in the past.Whether each module in the system needs to communicate through interconnection lines can be divided into wired parallel control mode and no interconnection parallel control mode.With the rapid development and maturity of parallel inverter technology, high reliability, high redundancy, intelligent control is the main development direction, compared with the interconnection parallel system,The non-interconnect parallel connection greatly improves the anti-interference ability and reliability because the transmission lines between the modules do not need signal.At present, the commonly used wireless parallel control method is droop method, which adjusts the output voltage of the module by adjusting the output power.Firstly, the paper introduces the current situation of energy problems in various countries, leads to the significance and development space of solar power generation, and further analyzes the importance of photovoltaic inverter to photovoltaic power generation system.The main circuit structure and working principle of inverter are studied in detail.Secondly, through the establishment of simulation model, the causes of the circulation of parallel system are analyzed, and the parallel system of double closed loop control inverter without parallel control strategy is simulated and analyzed.The effect of control parameters on the current sharing performance of parallel system is obtained by simulation results.Then it analyzes the regulation effect of distributed control strategy on the current sharing effect of parallel system. Through the derivation of formula and the result of simulation experiment, it is concluded that the distributed parallel control strategy can restrain the circulation of the system very well.The steady and dynamic performance of the circuit is improved.Finally, the droop control strategy of the double-loop inverter parallel system is introduced. By analyzing the circulation characteristics of the parallel inverter, the parallel system using the traditional droop method is simulated.The results show that the traditional droop method can achieve current sharing and power sharing, but it can also soften the output characteristics of the system.Further analysis shows that the micro-subdivision of power can improve the output characteristics and the dynamic performance of the system.
【學(xué)位授予單位】：遼寧工業(yè)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM464;TM615

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