發(fā)布時(shí)間：2018-02-05 22:34

  本文關(guān)鍵詞： 模塊化隔離型DC/DC 海上風(fēng)電場(chǎng)并網(wǎng) 模塊化多電平換流器 限流模型 子模塊故障 硬件搭建　出處：《浙江大學(xué)》2017年碩士論文　論文類型：學(xué)位論文

【摘要】：進(jìn)入21世紀(jì),環(huán)境問(wèn)題又一次成為全球關(guān)注的問(wèn)題,近年來(lái)霧霾問(wèn)題也成為民眾較為關(guān)注的焦點(diǎn),電力改革、能源結(jié)構(gòu)的調(diào)整勢(shì)在必行。在《中華人民共和國(guó)國(guó)民經(jīng)濟(jì)和社會(huì)發(fā)展第十三個(gè)五年規(guī)劃綱要》中,能源領(lǐng)域會(huì)開(kāi)始實(shí)施結(jié)構(gòu)調(diào)整,到2020年,非化石能源的比重將增加至15%,2030年增加至30%,而風(fēng)能作為資源儲(chǔ)量大、地域分散性等特點(diǎn),成為新能源領(lǐng)域備受關(guān)注的發(fā)電方式,而其中尤以海上風(fēng)電備受矚目。中國(guó)擁有地域遼闊的海上領(lǐng)土和海岸線,對(duì)于海上風(fēng)電的研究近年來(lái)處于穩(wěn)步增長(zhǎng)的態(tài)勢(shì),因此,研究海上風(fēng)電場(chǎng)并網(wǎng)系統(tǒng)具有重要意義。本文提出應(yīng)用于海上風(fēng)電的模塊化隔離型DC/DC變換器(Modular Isolated DC Converter,MIDC)結(jié)構(gòu),以及結(jié)合模塊化多電平換流器(Modular Multilevel Converter,MMC)在逆變器中的應(yīng)用,作了相關(guān)研究。針對(duì)所構(gòu)建的海上風(fēng)電并網(wǎng)系統(tǒng),深入分析了所提出的模塊化隔離型DC/DC換流器,的拓?fù)浣Y(jié)構(gòu)、工作原理,重點(diǎn)研究了模塊化隔離型DC/DC的子模塊故障問(wèn)題,提出了子模塊故障的冗余保護(hù)策略;提出三種備用方式,并且針對(duì)備用方式分析了冗余保護(hù)的各種工況;結(jié)合海上風(fēng)電并網(wǎng)維護(hù)的不便性,提出了子模塊故障個(gè)數(shù)的監(jiān)測(cè)策略,建立了相應(yīng)的數(shù)學(xué)模型,并在PSCAD中對(duì)于子模塊故障進(jìn)行了仿真驗(yàn)證�？紤]到所構(gòu)建系統(tǒng)主要適用于大容量、高電壓的海上風(fēng)電并網(wǎng)系統(tǒng),因此對(duì)于岸上逆變側(cè)也做了相關(guān)重點(diǎn)研究。由于電壓等級(jí)較高,因此采用模塊化多電平換流器作為逆變側(cè)的主要結(jié)構(gòu),在傳統(tǒng)最近電平逼近調(diào)制策略(Nearest Level Modulation,NLM)基礎(chǔ)上提出了能夠抑制二倍頻環(huán)流的改進(jìn)型策略,并在所搭建的仿真系統(tǒng)上進(jìn)行了穩(wěn)態(tài)和暫態(tài)的仿真驗(yàn)證。海上風(fēng)電并網(wǎng)系統(tǒng)遠(yuǎn)離海岸線,需要較高的可靠性以及穩(wěn)定性,同時(shí)盡量減少故障對(duì)電力電子器件的危害,故考慮在岸上逆變器交流出口側(cè)串入故障限流器(Fault Current Limiting,FCL),并構(gòu)建了相關(guān)的仿真模型,分析了故障限流器的工作原理及其對(duì)系統(tǒng)拓?fù)浼斑\(yùn)行狀態(tài)的影響,并進(jìn)行了穩(wěn)態(tài)、暫態(tài)以及故障狀況下的仿真驗(yàn)證。最后,介紹了所搭建的2250W的九子模塊模型,分模塊介紹了電路結(jié)構(gòu)以及相關(guān)器件的選型依據(jù),同時(shí)對(duì)DSP的相關(guān)控制程序進(jìn)行了解讀,對(duì)于模型樣機(jī)進(jìn)行了實(shí)驗(yàn)測(cè)試。
[Abstract]:In 21th century, the environmental problem has once again become a global concern. In recent years, haze has also become the focus of attention of the public, electricity reform. The readjustment of the energy structure is imperative. In the outline of the 13th Five-Year Plan for the National Economic and Social Development of the people's Republic of China, the energy sector will begin to implement structural adjustment by 2020. The proportion of non-fossil energy will increase to 15% and 30% in 2030. Wind energy, as a characteristic of large resource reserves and geographical dispersion, has become the most concerned power generation method in the field of new energy. Among them, offshore wind power has attracted much attention. China has a vast sea territory and coastline, the research on offshore wind power is growing steadily in recent years, therefore. It is of great significance to study the grid connection system of offshore wind farm. This paper presents a modular isolated DC/DC converter for offshore wind power. Modular Isolated DC Converter. The structure of MIDC and the application of modular multilevel converter (Modular Multilevel converter MMC) in inverter. According to the grid connection system of offshore wind power, the topology and working principle of the modular isolated DC/DC converter are analyzed in depth. The submodule fault of modular isolated DC/DC is studied, and the redundancy protection strategy of sub-module fault is proposed. Three kinds of standby modes are put forward, and the various conditions of redundancy protection are analyzed. Combined with the inconvenience of offshore wind power grid connection maintenance, the monitoring strategy of the number of sub-module failures is put forward, and the corresponding mathematical model is established. The sub-module fault is simulated and verified in PSCAD. Considering that the system is mainly suitable for large capacity and high voltage offshore wind power grid connection system. Because of the high voltage level, the modular multilevel converter is used as the main structure of the inverter side. Based on the traditional nearest level approach modulation strategy (nearest Level Modulation NLMs), an improved strategy is proposed to suppress the second harmonic loop. The simulation results of steady and transient state are given in the simulation system. The offshore wind power grid connection system is far from the coastline and needs high reliability and stability. At the same time, the harm of fault to power electronic devices is minimized, so the fault Current limiting FCLs are considered to be connected to the fault current limiter at the AC outlet of the shore inverter. The related simulation model is constructed, the working principle of the fault current limiter and its influence on the topology and operation state of the system are analyzed, and the simulation results of steady state, transient state and fault state are carried out. Finally, the simulation is carried out. This paper introduces the Nine sub-module model of 2250W, introduces the circuit structure and the selection basis of related devices, and interprets the related control program of DSP. The model prototype is tested experimentally.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM614

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