【摘要】：電氣化鐵道供電系統(tǒng)中存在諧波、無(wú)功和負(fù)序等問題,相鄰供電區(qū)間電分相裝置的存在導(dǎo)致列車運(yùn)行速度低,主斷路器頻繁分?jǐn)?影響牽引主電路的安全運(yùn)行。采用新型同相供電變流器實(shí)現(xiàn)列車同相供電,可以使上述問題得到很好解決。與現(xiàn)有的同相供電變流器相比,采用MMC同相供電變流器可以省去一個(gè)變壓器,提高系統(tǒng)效率,減小體積,降低成本。本論文將模塊化多電平變流器(MMC)技術(shù)應(yīng)用于同相供電變流器,對(duì)相關(guān)關(guān)鍵技術(shù)開展研究。研究了單相MMC。分析比較了傳統(tǒng)多電平變換器的類型和優(yōu)缺點(diǎn),詳細(xì)論述了單相MMC的拓?fù)浣Y(jié)構(gòu)及工作原理,建立了單相MMC的數(shù)學(xué)模型,結(jié)合載波移相技術(shù)(CPS-SPWM)的調(diào)制策略,運(yùn)用子模塊直流電容的均壓控制策略對(duì)直流母線電壓穩(wěn)壓,保證MMC的正常工作。研究了MMC同相供電變流器。分析了同相牽引供電系統(tǒng)的基本結(jié)構(gòu)和工作原理,在此基礎(chǔ)上創(chuàng)新性地將MMC結(jié)構(gòu)運(yùn)用在綜合潮流補(bǔ)償器(IPFC)中,并探討了相應(yīng)的指令電流檢測(cè)算法。針對(duì)5MVA容量的同相供電變流器進(jìn)行設(shè)計(jì)和仿真。對(duì)該變流器的主電路器件進(jìn)行參數(shù)計(jì)算和選型,在MATLAB/simulink平臺(tái)中搭建模型進(jìn)行不同工況下的仿真實(shí)驗(yàn),最后結(jié)合同相供電系統(tǒng)設(shè)計(jì)了一個(gè)主從式結(jié)構(gòu)的MMC控制器系統(tǒng)。通過MATLAB/simulink的仿真實(shí)驗(yàn),驗(yàn)證了CPS-SPWM調(diào)制策略和子模塊穩(wěn)壓控制策略的正確性,基于MMC的同相供電變流器在不同工況條件下均能正常進(jìn)行有功傳遞、無(wú)功補(bǔ)償和諧波抑制,達(dá)到對(duì)電氣化鐵道供電的電能質(zhì)量進(jìn)行綜合治理的目的。
[Abstract]:There are some problems in electrified railway power supply system, such as harmonic, reactive power and negative sequence. The existence of electric phase separation device in adjacent power supply area leads to low train speed and frequent break-down of main circuit breaker, which affects the safe operation of main traction circuit. The problem mentioned above can be solved well by using a new type of in-phase power converter to realize the in-phase power supply of the train. Compared with the existing in-phase power supply converter, the MMC in-phase power converter can save a transformer, improve the system efficiency, reduce the volume and reduce the cost. In this paper, the modularized multilevel converter (MMC) technology is applied to the in-phase power supply converter, and the related key technologies are studied. Single phase MMC was studied. This paper analyzes and compares the types, advantages and disadvantages of traditional multilevel converters, discusses the topology and working principle of single-phase MMC in detail, establishes the mathematical model of single-phase MMC, and combines the modulation strategy of carrier phase-shifting technique (CPS-SPWM). The DC bus voltage is stabilized by the voltage equalizing control strategy of the DC capacitor of the submodule to ensure the normal operation of the MMC. The MMC in phase power converter is studied. The basic structure and working principle of the in-phase traction power supply system are analyzed. On this basis, the MMC structure is creatively applied to the integrated power flow compensator (IPFC), and the corresponding instruction current detection algorithm is discussed. The design and simulation of 5 MVA power supply converter are carried out. The main circuit components of the converter are calculated and selected, and a model is built in MATLAB / Simulink platform to carry out simulation experiments under different working conditions. Finally, a master-slave structure MMC controller system is designed combined with the in-phase power supply system. The correctness of CPS-SPWM modulation strategy and submodule voltage stabilization control strategy is verified by the simulation experiment of MATLAB / Simulink. Active power transfer, reactive power compensation and harmonic suppression can be normally carried out in the in-phase power converter based on MMC under different working conditions. To achieve the purpose of comprehensive treatment of power quality of electrified railway power supply.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：U224

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本文編號(hào)：2133188