本文選題：貫通供電系統(tǒng) + 三相-單相變換器��； 參考：《西南交通大學(xué)》2015年碩士論文

【摘要】：針對(duì)現(xiàn)有供電系統(tǒng)的不足而提出的貫通供電系統(tǒng)能夠完全取消電分相裝置,較好地解決電能質(zhì)量問(wèn)題。同時(shí),電力電子器件功率等級(jí)的不斷提升使得該系統(tǒng)的優(yōu)勢(shì)日益突出。本文研究用于無(wú)輸出變壓器新型貫通供電系統(tǒng)的級(jí)聯(lián)變換器,并從理論、仿真和實(shí)驗(yàn)三方面驗(yàn)證了系統(tǒng)的可行性。本文首先從工程實(shí)際出發(fā),設(shè)計(jì)了用于新型貫通供電系統(tǒng)的三相-單相級(jí)聯(lián)變換器結(jié)構(gòu)及其控制系統(tǒng)。研究了三相三電平二極管鉗位整流器的拓?fù)浣Y(jié)構(gòu)和工作原理,建立了整流器在dq坐標(biāo)系下的數(shù)學(xué)模型,結(jié)合數(shù)學(xué)模型研究了dq解耦雙閉環(huán)控制策略；研究了單相三電平二極管鉗位級(jí)聯(lián)逆變器的拓?fù)浣Y(jié)構(gòu)和工作原理,建立了逆變器的數(shù)學(xué)模型,在此基礎(chǔ)上研究了單相級(jí)聯(lián)逆變器的電壓閉環(huán)控制策略；探討了三相-單相變換器直流電壓二次脈動(dòng)產(chǎn)生機(jī)理,并設(shè)計(jì)了二次濾波電路來(lái)抑制直流側(cè)電壓二次脈動(dòng)。結(jié)合多電平調(diào)制技術(shù)研究現(xiàn)狀,重點(diǎn)研究了多載波SPWM調(diào)制策略。深入分析了載波層疊SPWM調(diào)制策略(Carrier Disposition SPWM, CD-SPWM)和載波移相SPWM調(diào)制策略(Carrie Phase-shifted SPWM, CPS-SPWM),對(duì)比了不同調(diào)制策略下變換器輸出電壓的諧波特性。根據(jù)各個(gè)調(diào)制策略的優(yōu)缺點(diǎn),結(jié)合三電平二極管鉗位PWM變換器電路特點(diǎn),設(shè)計(jì)了適合三相-單相級(jí)聯(lián)變換器系統(tǒng)的調(diào)制策略,包括三相-單相PWM變換器模塊內(nèi)的同相層疊調(diào)制(Phase Disposition SPWM, PD-SPWM)和三相-單相PWM變換器模塊間CPS-SPWM級(jí)聯(lián)調(diào)制策略。在上述研究的基礎(chǔ)上,利用Matlab/simulink仿真平臺(tái)完成了三相-單相PWM變換器、單相PWM逆變器級(jí)聯(lián)仿真驗(yàn)證,最終搭建了基于三相-單相級(jí)聯(lián)變換器的新型貫通供電系統(tǒng)變電所仿真模型,在啟動(dòng)、空載、帶載等工況下分別對(duì)系統(tǒng)三相電網(wǎng)側(cè)、直流側(cè)、單相牽引網(wǎng)側(cè)仿真結(jié)果進(jìn)行分析,并分析了三相電網(wǎng)側(cè)電壓電流和單相輸出電壓的諧波特性。仿真結(jié)果表明系統(tǒng)在多種工況下均能正常穩(wěn)定工作,工況發(fā)生改變時(shí),系統(tǒng)能快速響應(yīng),超調(diào)小,調(diào)整時(shí)間短。在帶載情況下,系統(tǒng)網(wǎng)側(cè)功率因數(shù)為1,網(wǎng)側(cè)電壓電流諧波含量低,單相牽引網(wǎng)輸出電壓波形質(zhì)量高,動(dòng)態(tài)響應(yīng)好。仿真驗(yàn)證了理論分析的正確性和本文所設(shè)計(jì)的三相-單相級(jí)聯(lián)變換器系統(tǒng)結(jié)構(gòu)、控制策略、調(diào)制策略的可行性和有效性。最后,本文搭建了基于FPGA的小功率實(shí)驗(yàn)平臺(tái),設(shè)計(jì)了實(shí)驗(yàn)方案和實(shí)驗(yàn)系統(tǒng)結(jié)構(gòu)及參數(shù)。在實(shí)驗(yàn)平臺(tái)上完成了三相-單相PWM變換器實(shí)驗(yàn)、單相PWM變換器級(jí)聯(lián)實(shí)驗(yàn),三相-單相級(jí)聯(lián)變換器系統(tǒng)實(shí)驗(yàn)。實(shí)驗(yàn)結(jié)果證明,本文所研究的級(jí)聯(lián)變換器能夠有效擴(kuò)大系統(tǒng)容量,同時(shí)進(jìn)一步驗(yàn)證了本系統(tǒng)的主電路結(jié)構(gòu)、控制策略和調(diào)制策略的可行性。綜上所述,本文在理論分析的基礎(chǔ)上,設(shè)計(jì)了用于新型貫通供電系統(tǒng)的三相-單相級(jí)聯(lián)變換器結(jié)構(gòu)、控制系統(tǒng)及其調(diào)制策略,通過(guò)仿真和實(shí)驗(yàn)驗(yàn)證了基于三相-單相級(jí)聯(lián)變換器的新型貫通供電系統(tǒng)可取消輸出升壓變壓器,降低系統(tǒng)電力電子器件的耐壓要求；輸出電壓電平數(shù)可倍增,使得開(kāi)關(guān)頻率可降得更低,開(kāi)關(guān)損耗隨之降低；當(dāng)電平數(shù)足夠高時(shí),諧波含量很低,可取消濾波電路；可根據(jù)工程需求增減變換器級(jí)聯(lián)級(jí)數(shù),方便擴(kuò)容；系統(tǒng)動(dòng)態(tài)響應(yīng)好,能夠適應(yīng)多種工況。
[Abstract]:In view of the shortage of the existing power supply system, the connected power supply system can completely cancel the electric separation device and solve the problem of the power quality. At the same time, the continuous improvement of power electronic device power level makes the advantage of the system increasingly prominent. This paper studies the cascade converter used in the new type of power supply system of the non output voltage regulator. The feasibility of the system is verified from three aspects of theory, simulation and experiment. In this paper, the structure and control system of a three-phase to phase cascade converter for a new type of connected power supply system are designed in this paper. The topology and working principle of the three-phase three level diode clamp rectifier are studied, and the rectifier is set up in the DQ seat. The mathematical model in the standard system is used to study the DQ decoupling double closed loop control strategy with the mathematical model. The topology and working principle of the single-phase three level diode clamped cascaded inverter are studied, and the mathematical model of the inverter is established. On this basis, the voltage closed loop control strategy of the single-phase cascade inverter is studied. The two pulse generation mechanism of the DC voltage of the phase change converter is produced, and the two filter circuits are designed to suppress the two pulse of the DC side voltage. The multi level modulation technology is studied and the multi carrier SPWM modulation strategy is studied. The carrier cascaded SPWM modulation strategy (Carrier Disposition SPWM, CD-SPWM) and the carrier phase shift SPWM modulation are deeply analyzed. The Carrie Phase-shifted SPWM (CPS-SPWM) compares the harmonic characteristics of the output voltage of the converter under different modulation strategies. According to the advantages and disadvantages of each modulation strategy and the characteristics of the three level diode clamp PWM converter, a modulation strategy suitable for the three-phase to single-phase converter system is designed, including the three-phase to single-phase PWM transform. The CPS-SPWM cascaded modulation strategy between Phase Disposition SPWM (PD-SPWM) and three-phase to single phase PWM converter module is used in the module. On the basis of the above research, the three-phase to single-phase PWM converter is completed with the Matlab/simulink simulation platform, and the single-phase PWM inverter cascaded simulation verification, and finally built on the three-phase to single phase. The simulation model of a new type of connected power supply system of cascade converter is used to analyze the simulation results of the three-phase grid side, the DC side and the single-phase traction network under the starting, no-load and load conditions. The harmonic characteristics of the voltage current and the single-phase output voltage of the three-phase grid are analyzed. The simulation results show that the system is in a variety of conditions. The power factor of the system network side is 1, the harmonic content of the network side voltage and current is low, the output voltage waveform of the single phase traction network is high and the dynamic response is good. The correctness of the theoretical analysis and the design of this paper have been verified by simulation. The structure of three-phase to single-phase cascade converter system, control strategy, modulation strategy feasibility and effectiveness. Finally, this paper built a FPGA based small power experiment platform, designed the experimental scheme and experimental system structure and parameters. On the experimental platform, the three-phase to single-phase PWM converter experiment, the single-phase PWM converter cascade experiment, three phase - Experimental results show that the cascaded converter can effectively expand the capacity of the system, and further verify the structure of the main circuit, the control strategy and the feasibility of the modulation strategy. On the basis of the theoretical analysis, this paper designs a new type of through power supply system. The three-phase to single-phase cascade converter structure, control system and its modulation strategy, through simulation and experiment verify that the new type of connected power supply system based on the three-phase to single phase cascade converter can cancel the output boost transformer, reduce the pressure requirement of the system power electronic device, the output voltage level can be doubled, so that the switching frequency can be reduced more. Low switching loss is decreased; when the level is high enough, the harmonic content is very low, can cancel the filter circuit; according to the engineering requirements or converter cascade, convenient expansion; good dynamic response, can adapt to a variety of conditions.
【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)】：TM46

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