本文選題：直流配電網(wǎng) + 高頻隔離��； 參考：《東北電力大學(xué)》2017年碩士論文

【摘要】：現(xiàn)有交流配電網(wǎng)已經(jīng)無(wú)法滿(mǎn)足未來(lái)用戶(hù)多樣化的用電需求和大量新能源的接入,而直流配電網(wǎng)卻有著交流網(wǎng)無(wú)法比擬的優(yōu)勢(shì),諸如提高電容量和電能質(zhì)量、快速獨(dú)立地控制有功功率、接入可再生能源靈活便捷等,無(wú)疑將會(huì)成為未來(lái)配電網(wǎng)研究的主要方向。本文著力于未來(lái)直流配電網(wǎng)功率變換應(yīng)用研究,提出了一種新型高頻隔離型組合式直流變壓器(ADCT)概念,利用標(biāo)準(zhǔn)化模塊來(lái)構(gòu)建所期望的系統(tǒng)結(jié)構(gòu),并通過(guò)臨近控制來(lái)協(xié)調(diào)模塊功率,進(jìn)而實(shí)現(xiàn)整體平衡。本文采用LLC諧振變換器作為組合式直流變壓器的標(biāo)準(zhǔn)化模塊,通過(guò)串并聯(lián)結(jié)構(gòu)組建直流變換系統(tǒng)。LLC諧振變換器可實(shí)現(xiàn)前后端完全軟開(kāi),轉(zhuǎn)換效率高,而且其電壓鉗位特性可自然實(shí)現(xiàn)前串后并(ISOP)型系統(tǒng)的輸入電壓均衡(IVS)。本文詳細(xì)推導(dǎo)了LLC諧振變換模塊的電壓增益,并通過(guò)實(shí)驗(yàn)繪制了增益曲線(xiàn),證明了電壓鉗位特性實(shí)現(xiàn)ISOP型系統(tǒng)電壓平衡的可行性。利用電壓鉗位特性,結(jié)合電磁耦合電流平衡(MC-CB)單元,本文提出了臨近控制概念并對(duì)MC-CB單元進(jìn)行了詳盡的理論推導(dǎo)和仿真分析,證明了MC-CB單元實(shí)現(xiàn)前并后并(IPOP)型系統(tǒng)電流均流控制的可行性。之后,提出了新型IS-IPOP型結(jié)構(gòu),結(jié)合臨近控制可開(kāi)環(huán)實(shí)現(xiàn)電壓電流的獨(dú)立控制。本文所提出的組合式直流變壓器動(dòng)態(tài)性能優(yōu)越,系統(tǒng)穩(wěn)定可靠,可實(shí)現(xiàn)系統(tǒng)模塊的有載投切和冗余備份,方便現(xiàn)場(chǎng)操作,具有很大的應(yīng)用前景。最后,搭建的組合式直流變壓器硬件實(shí)驗(yàn)系統(tǒng)也驗(yàn)證了本文方案的有效性和合理性。
[Abstract]:The current AC distribution network has been unable to meet the diversified needs of future users and access to a large number of new sources of energy, but the DC distribution network has the incomparable advantages of AC network, such as improving the capacity and power quality. Rapid and independent control of active power and flexible and convenient access to renewable energy will undoubtedly become the main research direction of distribution network in the future. This paper focuses on the application of power conversion in the future DC distribution network, and proposes a new concept of high-frequency isolated combined DC transformer ADCT, which uses standardized modules to construct the desired system structure. The module power is coordinated by proximity control, and the overall balance is realized. In this paper, the LLC resonant converter is used as the standardized module of the combined DC transformer, and the DC conversion system .LLC resonant converter is constructed by series-parallel structure, which can realize the complete soft opening of the front and rear end and the high conversion efficiency. Moreover, the voltage clamping characteristic can naturally realize the input voltage equalization of the forward and back ISOP- type system. In this paper, the voltage gain of the LLC resonant conversion module is deduced in detail, and the gain curve is drawn through experiments. It is proved that the voltage clamping characteristic is feasible to realize the voltage balance of the ISOP type system. Based on the characteristics of voltage clamp and electromagnetic coupling current balance (MC-CBC) unit, the concept of proximity control is proposed, and the theoretical derivation and simulation analysis of the MC-CB element are given in detail. It is proved that the current sharing control of MC-CB unit is feasible. After that, a new type of IS-IPOP structure is proposed, which can realize the independent control of voltage and current. The combined DC transformer presented in this paper has the advantages of superior dynamic performance, stable and reliable system, can realize on-load switching and redundant backup of the system module, and is convenient for field operation, and has a great application prospect. Finally, the combined DC transformer hardware experimental system is built to verify the validity and rationality of the proposed scheme.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類(lèi)號(hào)】：TM41

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