本文選題：配電網(wǎng) + 電力電子變壓器��； 參考：《東北電力大學(xué)》2017年碩士論文

【摘要】：傳統(tǒng)電力電子變壓器多采用多級結(jié)構(gòu),采集變量、控制變量以及控制目標(biāo)較多,隨著電壓、容量等級增大,控制系統(tǒng)相當(dāng)復(fù)雜,且由于級聯(lián)模塊數(shù)的增加,其體積及成本直線上升。這些問題都制約著電力電子變壓器推廣和應(yīng)用。本文正是圍繞這些問題,在傳統(tǒng)電力電子變壓器的拓?fù)浣Y(jié)構(gòu)及控制策略的基礎(chǔ)上,對電力電子變壓器的拓?fù)浣Y(jié)構(gòu)、建模方法及控制策略展開研究。首先,對現(xiàn)有的幾種典型電力電子變壓器拓?fù)浣Y(jié)構(gòu)及優(yōu)缺點(diǎn)進(jìn)行分析,在此基礎(chǔ)上,將諧振變換器及兩電平方波變換器引入到傳統(tǒng)級聯(lián)型電力電子變壓器,提出一種適用于中高壓配電網(wǎng)的新型電力電子變壓器拓?fù)浣Y(jié)構(gòu)。與傳統(tǒng)電力電子變壓器相比,所提拓?fù)涞膬?yōu)勢在于可以顯著減少體積,提高運(yùn)行效率,并能夠靈活切換于純有功模式及無功補(bǔ)償模式。其次,對所提拓?fù)浣Y(jié)構(gòu)及工作原理進(jìn)行了詳細(xì)的論述,并提出一種基于諧振變換器恒定電壓增益特性的電力電子變壓器統(tǒng)一降階建模方法,并建立了系統(tǒng)的交流側(cè)及直流側(cè)的統(tǒng)一降階模型。在此基礎(chǔ)上,結(jié)合諧振變換器的工作特性提出了一種單級統(tǒng)一控制策略,簡化了電力電子變壓器的控制系統(tǒng),使其控制復(fù)雜度不再隨著級聯(lián)模塊數(shù)的增加而增加。并在PET仿真環(huán)境中搭建了10kV/1.5MW的電力電子變壓器模型,仿真結(jié)果表明了所提拓?fù)浣Y(jié)構(gòu)及其控制策略的可行性和有效性。
[Abstract]:Traditional power electronic transformers adopt multi-stage structure, collect variables, control variables and control targets. With the increase of voltage and capacity, the control system is quite complex, and because of the increase of the number of cascaded modules, the control system is very complex. Its volume and cost rise in a straight line. These problems restrict the promotion and application of power electronic transformers. On the basis of the traditional topology and control strategy of power electronic transformer, the topology structure, modeling method and control strategy of power electronic transformer are studied in this paper. Firstly, the topology, advantages and disadvantages of several typical power electronic transformers are analyzed. On this basis, resonant converters and two electric square wave converters are introduced into the traditional cascaded power electronic transformers. This paper presents a new topology of power electronic transformers for medium and high voltage distribution networks. Compared with traditional power electronic transformer, the advantage of the proposed topology is that it can significantly reduce the volume, improve the operation efficiency, and can flexibly switch to the pure active power mode and reactive power compensation mode. Secondly, the proposed topology and working principle are discussed in detail, and a unified reduced-order modeling method for power electronic transformer based on constant voltage gain characteristics of resonant converter is proposed. The unified order reduction model of AC side and DC side of the system is established. On this basis, a single stage unified control strategy is proposed to simplify the control system of power electronic transformers, which makes the control complexity no longer increase with the increase of the number of cascaded modules. The power electronic transformer model of 10kV/1.5MW is built in the PET simulation environment. The simulation results show that the proposed topology and its control strategy are feasible and effective.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：TM41

【參考文獻(xiàn)】

相關(guān)期刊論文 前9條

1 蘭征;涂春鳴;肖凡;葛俊;熊誦輝;;電力電子變壓器對交直流混合微網(wǎng)功率控制的研究[J];電工技術(shù)學(xué)報;2015年23期

2 江添洋;張軍明;汪i襠，

本文編號：1900708