發(fā)布時(shí)間：2018-03-31 09:41

  本文選題：電子電力變壓器　切入點(diǎn)：變壓器保護(hù)　出處：《華中科技大學(xué)》2014年博士論文

【摘要】：對(duì)于電力系統(tǒng)而言,電力變壓器是最關(guān)鍵的元件之一,起著電力系統(tǒng)關(guān)鍵節(jié)點(diǎn)以及交換和傳遞能量的作用,同時(shí)也與電力系統(tǒng)的穩(wěn)定性和可靠性息息相關(guān)。電子電力變壓器是一種全新的電力變壓器,其原方和副方的電壓幅值和相角都可以實(shí)現(xiàn)實(shí)時(shí)控制,因此可以實(shí)現(xiàn)對(duì)電流和功率的控制。 由于電子電力變壓器由電力電子變換器組成,因此其相連接的電力系統(tǒng)的可靠性與組成電子電力變壓器的電力電子變換器及其開關(guān)器件密切相關(guān),使得電子電力變壓器的保護(hù)系統(tǒng)、故障特征和故障檢測(cè)尤為重要,其故障可能對(duì)整個(gè)電力系統(tǒng)造成損失。而國(guó)內(nèi)以及國(guó)際上對(duì)電子電力變壓器的保護(hù)系統(tǒng)較少有人研究,而在裝置級(jí)和器件級(jí)的保護(hù)上更是幾乎一片空白,因此本文主要對(duì)配電網(wǎng)電子電力變壓器的裝置級(jí)和器件級(jí)保護(hù)進(jìn)行研究和探討。 第一章主要介紹電子電力變壓器的研究現(xiàn)狀,之后對(duì)其適用拓?fù)湟约按笾驴刂撇呗赃M(jìn)行簡(jiǎn)單闡述。第二章側(cè)重對(duì)電子電力變壓器保護(hù)系統(tǒng)的原理和基本硬件進(jìn)行研究,其中包括監(jiān)控保護(hù)機(jī)箱、各個(gè)檢測(cè)板、控制系統(tǒng)、開關(guān)器件硬件保護(hù)以及避雷器的設(shè)計(jì),提出了電子電力變壓器基本保護(hù)的策略以及方案。第三章對(duì)第二章保護(hù)系統(tǒng)中的硬件進(jìn)行邏輯和算法方面的研究,并按照電子電力變壓器的工作狀態(tài)將保護(hù)系統(tǒng)分為數(shù)個(gè)階段,并按此分段實(shí)施保護(hù)。第四章則對(duì)前文所設(shè)計(jì)的保護(hù)系統(tǒng)挑選了數(shù)個(gè)具有代表性的故障進(jìn)行了測(cè)試,表明所研究的電子電力變壓器的裝置級(jí)保護(hù)可以實(shí)現(xiàn)對(duì)電子電力變壓器的保護(hù)。 第五章從電子電力變壓器的器件保護(hù)出發(fā),通過對(duì)電子電力變壓器的運(yùn)行進(jìn)行分析,推導(dǎo)得出了其開關(guān)器件故障后的故障特征,并發(fā)現(xiàn)其相關(guān)波形的畸變與具體故障開關(guān)器件的位置以及故障類型有緊密的聯(lián)系,由此能夠?qū)γ總�(gè)故障的開關(guān)器件進(jìn)行定位。最后通過仿真對(duì)故障特征進(jìn)行了驗(yàn)證,并提出了基于其分析結(jié)果的故障定位算法。 第六章研究了輸入電壓的電壓跌落以及短時(shí)斷電對(duì)電子電力變壓器固有運(yùn)行方式以及保護(hù)方式所造成的影響,指出該故障下電子電力變壓器的IGBT將會(huì)過電流,并最后通過分析與仿真得出避免和減輕其開關(guān)器件過流的措施。 第七章討論了在電子電力變壓器上應(yīng)用混合級(jí)聯(lián)多電平拓?fù)湟约鞍A梯波調(diào)制在內(nèi)的數(shù)個(gè)調(diào)制方法的可能性,并對(duì)混合級(jí)聯(lián)多電平拓?fù)渖蠎?yīng)用階梯波調(diào)制,PWM調(diào)制以及部分PWM調(diào)制進(jìn)行仿真,隨后基于諧波和開關(guān)損耗對(duì)其結(jié)果進(jìn)行比較。最后搭建了15電平逆變器的實(shí)驗(yàn)室樣機(jī),并實(shí)現(xiàn)了近似正弦波且總諧波畸變率低于5%的輸出電壓。
[Abstract]:For power system, power transformer is one of the most important components, which acts as the key node of power system and functions as the exchange and transfer of energy. At the same time, it is closely related to the stability and reliability of power system. Electronic power transformer is a new kind of power transformer, whose voltage amplitude and phase angle can be controlled in real time. Therefore, the control of current and power can be realized. Because the electronic power transformer is composed of power electronic converter, the reliability of the connected power system is closely related to the power electronic converter and its switching device that make up the electronic power transformer. It makes the protection system of electronic power transformer, fault characteristic and fault detection especially important, and its fault may cause losses to the whole power system. However, there are few researches on the protection system of electronic power transformer at home and abroad. But the protection of device level and device level is almost a blank, so this paper mainly studies and discusses the device level and device level protection of electronic power transformer in distribution network. The first chapter mainly introduces the research status quo of the electronic power transformer, and then gives a brief description of its applicable topology and general control strategy. The second chapter focuses on the principle and basic hardware of the electronic power transformer protection system. These include the monitoring and protection case, the various detection boards, the control system, the switch device hardware protection and the design of the lightning arrester. In chapter 3, the logic and algorithm of the hardware in the second chapter are studied, and the protection system is divided into several stages according to the working state of the electronic power transformer. In the fourth chapter, several representative faults are selected for the protection system designed in the previous chapter. It is shown that the device level protection of the studied electronic power transformer can realize the protection of the electronic power transformer. In the fifth chapter, based on the device protection of the electronic power transformer, through the analysis of the operation of the electronic power transformer, the fault characteristics after the fault of the switch device are deduced. It is also found that the distortion of the relevant waveforms is closely related to the location and type of the fault switch devices, so that each fault switch device can be located. Finally, the fault characteristics are verified by simulation. A fault location algorithm based on its analysis results is proposed. In chapter 6, the influence of voltage drop of input voltage and short time outage on the inherent operation mode and protection mode of electronic power transformer is studied. It is pointed out that the IGBT of electronic power transformer will overcurrent under this fault. Finally, through the analysis and simulation, the measures to avoid and reduce the overcurrent of its switch device are obtained. In chapter 7, the possibility of applying hybrid cascade multilevel topology and several modulation methods, including step wave modulation, to electronic power transformers is discussed. In this paper, the step wave modulation and partial PWM modulation are simulated on the hybrid cascade multilevel topology, and the results are compared based on the harmonic and switching losses. Finally, the laboratory prototype of the 15-level inverter is built. The output voltage with approximate sine wave and total harmonic distortion rate is less than 5%.
【學(xué)位授予單位】：華中科技大學(xué)
【學(xué)位級(jí)別】：博士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM41

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 梁才浩,段獻(xiàn)忠;分布式發(fā)電及其對(duì)電力系統(tǒng)的影響[J];電力系統(tǒng)自動(dòng)化;2001年12期

2 楊經(jīng)超,尹項(xiàng)根,陳德樹,張哲;基于DSP和APCI工控機(jī)的變壓器保護(hù)裝置[J];電力系統(tǒng)自動(dòng)化;2002年11期

3 趙劍鋒;輸出電壓恒定的電力電子變壓器仿真[J];電力系統(tǒng)自動(dòng)化;2003年18期

4 鄧衛(wèi)華,張波,胡宗波;電力電子變壓器電路拓?fù)渑c控制策略研究[J];電力系統(tǒng)自動(dòng)化;2003年20期

5 王丹,毛承雄,陸繼明;電子電力變壓器的并聯(lián)運(yùn)行[J];電力系統(tǒng)自動(dòng)化;2005年16期

6 萬毅,陸繼明,王丹,毛承雄;高壓大功率電力電子裝置的防雷保護(hù)[J];電力系統(tǒng)及其自動(dòng)化學(xué)報(bào);2005年04期

7 曹解圍,毛承雄,陸繼明,范澍;電力電子變壓器在改善電力系統(tǒng)動(dòng)態(tài)特性中的應(yīng)用[J];電力自動(dòng)化設(shè)備;2005年04期

8 王賓,潘貞存,徐丙垠;配電系統(tǒng)電壓跌落問題的分析[J];電網(wǎng)技術(shù);2004年02期

9 范澍,毛承雄,陳洛南;同步發(fā)電機(jī)-電力電子變壓器組的最優(yōu)協(xié)調(diào)控制[J];電網(wǎng)技術(shù);2005年02期

10 舒印彪;劉澤洪;袁駿;陳葛松;高理迎;;2005年國(guó)家電網(wǎng)公司特高壓輸電論證工作綜述[J];電網(wǎng)技術(shù);2006年05期

相關(guān)博士學(xué)位論文 前2條

1 方晶;高壓變頻器過電壓保護(hù)與控制[D];華中科技大學(xué);2011年

2 劉海波;電子電力變壓器控制策略研究[D];華中科技大學(xué);2009年

，

本文編號(hào)：1690177