本文選題：多端柔性直流輸電 + 直流側(cè)故障分析��； 參考：《華北電力大學(xué)》2014年碩士論文

【摘要】：多端柔性直流輸電系統(tǒng)(Multi-terminal DC Transmission System based onVSC，VSC-MTDC)因其運(yùn)行方式靈活、可靠等諸多優(yōu)勢(shì)，在分布式發(fā)電系統(tǒng)并網(wǎng)、新能源發(fā)電并網(wǎng)、城市高壓直流配電等領(lǐng)域擁有廣闊應(yīng)用前景，是未來(lái)直流輸電技術(shù)的重要發(fā)展方向。本文采用理論分析與仿真驗(yàn)證相結(jié)合的方法，以多端柔性直流輸電控制策略、直流側(cè)故障特征分析以及直流側(cè)故障后的保護(hù)策略為核心展開研究。 首先，本文分析比較了多端柔性直流系統(tǒng)的接線方式，以及兩電平電壓源換流器、三電平二極管中性點(diǎn)鉗位型電壓源換流器以及模塊化多電平換流器這三種應(yīng)用較為廣泛的換流器拓?fù)浣Y(jié)構(gòu)。在推導(dǎo)出多端柔性直流輸電系統(tǒng)數(shù)學(xué)模型的基礎(chǔ)之上，結(jié)合多端柔性直流輸電的應(yīng)用場(chǎng)合，針對(duì)所連不同交流系統(tǒng)設(shè)計(jì)了滿足其穩(wěn)定運(yùn)行的單個(gè)柔性直流換流站站級(jí)控制策略。 然后，為了提出具有針對(duì)性的直流側(cè)故障保護(hù)策略，本文分析了多端柔性直流系統(tǒng)的直流側(cè)正負(fù)極間短路故障、單極接地故障、斷線故障的故障特征。根據(jù)換流器拓?fù)浣Y(jié)構(gòu)的不同，分兩大類進(jìn)行了理論分析，并且在PSCAD/EMTDC軟件中進(jìn)行了仿真分析。 最后，論文在分析了多端柔性直流系統(tǒng)直流線路保護(hù)發(fā)展的趨勢(shì)以及現(xiàn)有直流線路保護(hù)策略缺陷的基礎(chǔ)上，提出了基于小波分析的直流輸電線路邊界保護(hù)算法，并且在PSCAD/EMTDC環(huán)境下搭建了一個(gè)四端網(wǎng)狀多端直流系統(tǒng)模型，，仿真數(shù)據(jù)通過Matlab小波分析包進(jìn)行處理。仿真結(jié)果表明論文所提出的基于小波分析的直流線路邊界保護(hù)算法能夠?qū)崿F(xiàn)多端直流系統(tǒng)直流側(cè)故障保護(hù)的選擇性及速動(dòng)性。論文針對(duì)多端柔性直流輸電系統(tǒng)直流側(cè)故障所提出的保護(hù)策略能夠?qū)崿F(xiàn)系統(tǒng)故障后的快速恢復(fù)，有效地提高了多端系統(tǒng)的故障穿越能力。
[Abstract]:Multi-terminal DC Transmission system based on VSC-MTDC (Multi-terminal DC Transmission system based on VSC-MTDC) has a broad application prospect in distributed generation system, new energy generation, urban HVDC distribution and so on because of its flexible and reliable operation. It is an important development direction of DC transmission technology in the future. In this paper, the control strategy of multi-terminal flexible direct current transmission, the characteristic analysis of DC side fault and the protection strategy after DC side fault are studied by combining theoretical analysis and simulation verification. Firstly, the connection mode of multi-terminal flexible DC system and the two-level voltage source converter are analyzed and compared. Three-level diode neutral clamping voltage source converter and modularized multilevel converter are three widely used converter topologies. Based on the mathematical model of multi-terminal flexible direct current transmission system, combined with the application of multi-terminal flexible direct current transmission system, a single flexible DC converter station level control strategy is designed for different AC systems connected to meet its stable operation. Then, in order to put forward the strategy of DC side fault protection, the fault characteristics of DC side positive and negative pole short circuit fault, single pole grounding fault and break line fault of multi-terminal flexible DC system are analyzed in this paper. According to the different topology structure of the converter, the theoretical analysis is carried out in two categories, and the simulation analysis is carried out in PSCAD / EMTDC software. Finally, on the basis of analyzing the development trend of DC line protection in multi-terminal flexible DC system and the shortcomings of existing DC line protection strategy, a wavelet analysis based DC transmission line boundary protection algorithm is proposed. A four-terminal mesh multi-terminal DC system model is built in PSCAD / EMTDC environment. The simulation data is processed by Matlab wavelet analysis package. The simulation results show that the proposed DC line boundary protection algorithm based on wavelet analysis can realize the selectivity and rapidity of DC side fault protection in multi-terminal DC system. In this paper, the proposed protection strategy for DC side faults of multi-terminal flexible direct current transmission system can achieve fast recovery after system failure, and effectively improve the fault traversing ability of multi-terminal system.
【學(xué)位授予單位】：華北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TM721.1

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本文編號(hào)：2032962