【摘要】：隨著風(fēng)電技術(shù)的進(jìn)步,風(fēng)電系統(tǒng)開始向高效率、大容量方向發(fā)展。對于直驅(qū)永磁同步風(fēng)力發(fā)電系統(tǒng),一方面,在保證變流器輸出電壓滿足并網(wǎng)需求下,功率變流器較窄的調(diào)壓范圍直接限制風(fēng)力機(jī)的轉(zhuǎn)速范圍,進(jìn)而降低了風(fēng)力機(jī)在寬風(fēng)速范圍的捕風(fēng)效率;另一方面,功率變流器件的容量有限,會限制變流器容量,阻礙風(fēng)力發(fā)電系統(tǒng)向更大容量發(fā)展。為了增加風(fēng)力機(jī)寬風(fēng)速范圍的捕風(fēng)效率和風(fēng)電系統(tǒng)的單機(jī)容量,本文提出一種多直流支路串并組合切換的直驅(qū)永磁風(fēng)電系統(tǒng)拓?fù)浣Y(jié)構(gòu)。此拓?fù)浣Y(jié)構(gòu)采用多支路結(jié)構(gòu)降低各支路電流等級,擴(kuò)展系統(tǒng)容量;支路串并組合形式可切換,在發(fā)電機(jī)低轉(zhuǎn)速時(shí)增加串聯(lián)的支路數(shù)、發(fā)電機(jī)高轉(zhuǎn)速時(shí)降低串聯(lián)的支路數(shù),保證發(fā)電機(jī)在寬轉(zhuǎn)速范圍內(nèi)變化時(shí)發(fā)電機(jī)的母線電壓在較窄的范圍內(nèi)變化,提高了風(fēng)力機(jī)在寬風(fēng)速范圍的捕風(fēng)效率。本課題對多支路直驅(qū)永磁同步發(fā)電機(jī)進(jìn)行設(shè)計(jì),搭建了發(fā)電機(jī)ansoft有限元模型。綜合了二極管的單向?qū)ㄐ院蜆湫瓮負(fù)浣Y(jié)構(gòu)容錯(cuò)性,設(shè)計(jì)了一種可實(shí)現(xiàn)直流支路串并組合切換的拓?fù)浣Y(jié)構(gòu)。推導(dǎo)了采用串并組合切換結(jié)構(gòu)所能擴(kuò)展的發(fā)電機(jī)轉(zhuǎn)速范圍關(guān)系式,分析了轉(zhuǎn)速范圍連續(xù)性對發(fā)電機(jī)和母線電壓變化范圍的約束條件。利用matlab/simulink軟件搭建系統(tǒng)仿真模型,仿真驗(yàn)證了支路串并連組合切換拓?fù)浣Y(jié)構(gòu)的實(shí)現(xiàn)支路切換和直流支路串并組合擴(kuò)展發(fā)電機(jī)轉(zhuǎn)速的可行性。搭建了多直流支路擴(kuò)速實(shí)驗(yàn)平臺進(jìn)一步驗(yàn)證直流支路串并組合擴(kuò)展發(fā)電機(jī)轉(zhuǎn)速的可行性。
[Abstract]:With the progress of wind power technology, wind power system began to develop in the direction of high efficiency and large capacity. For direct-drive permanent magnet synchronous wind power generation system, on the one hand, under the condition that the output voltage of converter meets the demand of grid connection, the narrow voltage range of power converter directly limits the speed range of wind turbine. Furthermore, the wind capture efficiency of the wind turbine in the wide wind speed range is reduced. On the other hand, the limited capacity of power converter will limit the capacity of converter and hinder the development of wind power system to larger capacity. In order to increase the wind capture efficiency in the wide range of wind speed and the single unit capacity of wind power system, this paper presents a topology of direct-drive permanent magnet wind power system with multi-DC branch series and combined switching. This topology adopts multi-branch structure to reduce the current level of each branch and expand the system capacity. When the generator has low speed, the number of branches in series can be increased, and the number of branches in series can be reduced when the speed of generator is high. When the generator changes in the wide speed range, the generator bus voltage changes in a narrow range, which improves the wind capture efficiency of the wind turbine in the wide wind speed range. In this paper, the permanent magnet synchronous generator with multi-branch direct drive is designed, and the ansoft finite element model of generator is built. The unidirectional conduction and tree topology fault tolerance of the diodes are synthesised, and a topology structure is designed which can realize the combination switching of the DC branch series. The relationship between the range of generator speed and the continuity of speed range is derived, which can be extended by the series-parallel combined switching structure, and the constraints of the continuity of speed range on the range of generator and bus voltage are analyzed. The simulation model of the system is built by using matlab/simulink software, and the feasibility of branch switching and DC branch string combination combined expansion generator speed is verified by simulation. A multi-DC branch speed expansion experimental platform was built to further verify the feasibility of the DC branch series and combined expansion generator speed.
【學(xué)位授予單位】：沈陽工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM315

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