【摘要】：為滿足我國社會經(jīng)濟(jì)的不斷發(fā)展需求,結(jié)合我國是內(nèi)陸大國、人口眾多、對交通運輸需求極大的基本國情,并且隨著國家對鐵路建設(shè)力度的不斷加大,近年來高速鐵路得到迅速的發(fā)展。從牽引供電系統(tǒng)來看,牽引變壓器、牽引網(wǎng)、動車組和綜合接地系統(tǒng)等設(shè)備構(gòu)成了一個完整封閉的能量流動系統(tǒng),牽引網(wǎng)作為該能量流動系統(tǒng)的重要組成部分,對高速鐵路的安全穩(wěn)定運行起到舉足輕重的作用。因而,提取精準(zhǔn)的牽引網(wǎng)電氣參數(shù)并且建立精確的牽引網(wǎng)模型意義重大。 文中針對高速鐵路普遍采用的全并聯(lián)AT供電方式,結(jié)合牽引網(wǎng)的多導(dǎo)體傳輸線特性和分布參數(shù)特性建立鏈?zhǔn)骄W(wǎng)絡(luò)模型。求解每隔1km切割后的串聯(lián)子網(wǎng)的阻抗矩陣和導(dǎo)納矩陣。為解決傳輸線數(shù)目多且復(fù)雜的問題,將牽引網(wǎng)的多條傳輸線等效為]0根導(dǎo)線,推導(dǎo)了多導(dǎo)線的等值簡化方法。 在利用Carson公式對牽引網(wǎng)電氣參數(shù)進(jìn)行計算的基礎(chǔ)上,分別采用不同的方法提取特殊導(dǎo)線電氣參數(shù)。針對鋼軌和接觸線截面形狀的不規(guī)則性和磁化特性的復(fù)雜性,利用電磁場有限元方法對其進(jìn)行分析,較為精確地求解了它們的內(nèi)阻抗、對地電容,從而可以精確的計算導(dǎo)線的內(nèi)阻抗、互阻抗等；討論了貫通地線阻抗的求解方法。采用了四周無限隧道模型對隧道中導(dǎo)線參數(shù)進(jìn)行求解,計算隧道中導(dǎo)線的自阻抗、互阻抗和分布電容。此外,還通過研究高架橋的電氣參數(shù),求得了供電回路和橋墩之間的耦合系數(shù)。 在Simulink仿真平臺里搭建了牽引網(wǎng)仿真模型,通過分析牽引網(wǎng)短路阻抗特性并且實現(xiàn)牽引網(wǎng)短路阻抗仿真,驗證了所建立的牽引網(wǎng)數(shù)學(xué)模型的正確性。搭建CRH3型動車組模型,動車組模型的整流器和逆變器分別采用瞬態(tài)直接電流控制和間接轉(zhuǎn)矩控制的控制策略,通過對車載牽引變壓器、脈沖整流器、中間直流回路、PWM逆變器和異步牽引電機(jī)的輸出電氣量的分析,可以看出該電路模型能夠較好的表征CRH3型動車組的非線性特征。 實現(xiàn)了高速鐵路牽引網(wǎng)與CRH3型動車組的聯(lián)動仿真,同一供電臂下動車組不同位置時牽引網(wǎng)電壓和鋼軌電位分布的仿真,動車組位置固定且處于不同路段時牽引網(wǎng)鋼軌電位分布的仿真,從而研究了在加入非線性負(fù)荷后牽引網(wǎng)的電氣特性。
[Abstract]:In order to meet the social and economic development needs of our country, China is a large inland country with a large population and a great demand for transportation, and with the increasing intensity of railway construction in our country, In recent years, high-speed railway has been developed rapidly. From the point of view of traction power supply system, traction transformer, traction network, EMU and integrated grounding system constitute a complete closed energy flow system, traction network as an important part of the energy flow system, It plays an important role in the safe and stable operation of high speed railway. Therefore, it is of great significance to extract accurate electrical parameters of traction network and establish accurate traction network model. Aiming at the all-parallel AT power supply mode widely used in high-speed railway, a chain network model is established combining the characteristics of multi-conductor transmission lines and distributed parameters of traction network. The impedance matrix and admittance matrix of the series subnet after each 1km cut are solved. In order to solve the problem that the number of transmission lines is large and complex, the multiple transmission lines of traction network are equivalent to] 0 conductors, and the equivalent simplification method of multiple conductors is deduced. Based on the calculation of the electrical parameters of traction network by Carson formula, different methods are used to extract the electrical parameters of special conductors. In view of the irregularity of rail and contact line section shape and the complexity of magnetization characteristics, the finite element method of electromagnetic field is used to analyze them, and their internal impedance and earth capacitance are solved accurately. Therefore, the internal impedance and mutual impedance of the conductor can be accurately calculated, and the solution method of the penetrating earth wire impedance is discussed. The parameters of the traverse in the tunnel are solved by the infinite tunnel model, and the self-impedance, mutual impedance and distributed capacitance of the conductors in the tunnel are calculated. In addition, the coupling coefficient between the power supply circuit and the pier is obtained by studying the electrical parameters of the viaduct. The simulation model of traction network is built on the Simulink platform. By analyzing the characteristics of short circuit impedance of traction network and realizing the simulation of short circuit impedance of traction network, the correctness of the established mathematical model of traction network is verified. The rectifier and inverter of CRH3 type EMU model adopt the control strategy of transient direct current control and indirect torque control, respectively, through the vehicle traction transformer, pulse rectifier, By analyzing the output electrical parameters of the intermediate DC loop PWM inverter and asynchronous traction motor, it can be seen that the circuit model can well characterize the nonlinear characteristics of the CRH3 EMU. The simulation of high-speed railway traction network and CRH3 EMU is realized, and the simulation of traction network voltage and rail potential distribution in different positions under the same power supply arm is realized. The simulation of rail potential distribution of traction network with fixed position of EMU and different sections of road is carried out to study the electrical characteristics of traction network after adding nonlinear load.
【學(xué)位授予單位】：西南交通大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2014
【分類號】：U224

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