【摘要】：模塊化多電平換流器高壓直流輸電技術(shù)在主體部分、控制和保護(hù)系統(tǒng)中均采用了模塊化結(jié)構(gòu),有其他拓?fù)浣Y(jié)構(gòu)無(wú)法企及的技術(shù)優(yōu)勢(shì),可以大幅提升電壓源換流器直流輸電的性能,因此,其應(yīng)用前景非常廣闊。本文在研究MMC拓?fù)浣Y(jié)構(gòu)、運(yùn)行機(jī)理、數(shù)學(xué)模型以及調(diào)制技術(shù)等的基礎(chǔ)上,對(duì)子模塊電容電壓波動(dòng)、相問(wèn)環(huán)流及其抑制方案以及MMC的快速仿真算法展開(kāi)了研究。 首先,研究了MMC內(nèi)部環(huán)流的機(jī)理及其對(duì)交流側(cè)輸出相電壓的影響,在MMC的環(huán)流中,二次諧波環(huán)流最為顯著。其次,為了抑制二次諧波環(huán)流,本文提出了三相解耦二次諧波環(huán)流抑制算法,根據(jù)換流器交、直流側(cè)瞬時(shí)功率平衡,分別求得上、下橋臂子模塊電容電壓的參考值,該參考值在一個(gè)工頻周期內(nèi)圍繞某一恒定值呈周期性變化,可使得各子模塊電容電壓的不均衡程度明顯降低,二次諧波環(huán)流得到有效抑制。最后,在研究MMC內(nèi)部環(huán)流及其抑制方案的過(guò)程中,當(dāng)電平數(shù)較高時(shí),仿真速度會(huì)變慢,為解決該問(wèn)題,基于電容器和電抗器的時(shí)域等效模型,提出了MMC的快速仿真算法,該算法無(wú)需對(duì)子模塊進(jìn)行近似處理,在不降低準(zhǔn)確性的情況下減小節(jié)點(diǎn)導(dǎo)納矩陣的規(guī)模,大大提升了MMC在PSCAD/EMTDC環(huán)境中的仿真速度,且與MMC的控制策略有很好的兼容性。 本文所提出的環(huán)流抑制方案和快速仿真算法均已在PSCAD/EMTDC電磁暫態(tài)仿真軟件中搭建了相應(yīng)的模型,通過(guò)仿真驗(yàn)證了其有效性。
[Abstract]:The modularized multilevel converter HVDC transmission technology adopts modularized structure in the main part, control and protection system, which has the technical advantage that other topologies can not match. It can greatly improve the DC transmission performance of voltage source converter, so its application prospect is very broad. Based on the study of MMC topology, operation mechanism, mathematical model and modulation technology, this paper studies the capacitance voltage fluctuation of submodule, the interphase circulation and its suppression scheme, and the fast simulation algorithm of MMC. Firstly, the mechanism of internal circulation of MMC and its influence on the output voltage of AC side are studied. The second harmonic circulation is the most obvious in the circulation of MMC. Secondly, in order to suppress the second harmonic circulation, a three-phase decoupling second-harmonic circulation suppression algorithm is proposed. According to the instantaneous power balance of the converter and the DC side, the reference values of the capacitor voltage of the upper and lower arm modules are obtained, respectively. The reference value changes periodically around a constant value in a power frequency cycle, which can reduce the unbalance of capacitance voltage of each submodule and restrain the second harmonic circulation effectively. Finally, in the process of studying the internal circulation of MMC and its suppression scheme, the simulation speed will slow down when the level number is high. In order to solve this problem, a fast simulation algorithm of MMC is proposed based on the equivalent time-domain model of capacitors and reactors. The algorithm does not need to approximate the sub-modules, and reduces the size of node admittance matrix without reducing the accuracy, which greatly improves the simulation speed of MMC in PSCAD/EMTDC environment, and has good compatibility with MMC control strategy. Both the proposed scheme and the fast simulation algorithm have been built up in the PSCAD/EMTDC electromagnetic transient simulation software, and their effectiveness is verified by simulation.
【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)】：TM46

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