【摘要】：本文結(jié)合實(shí)驗(yàn)室項(xiàng)目提出了 3kW穩(wěn)流源變換器的設(shè)計(jì)與實(shí)現(xiàn)課題,對(duì)3kW穩(wěn)流源前級(jí)VIENNA整流器和后級(jí)全橋DC/DC變換器分別進(jìn)行了設(shè)計(jì)和優(yōu)化。VIENNA整流器拓?fù)涫侨娖诫娐?具有開關(guān)應(yīng)力小、輸入電流總諧波失真度低、功率因數(shù)高、結(jié)構(gòu)簡(jiǎn)單等優(yōu)點(diǎn),引起了國(guó)內(nèi)外學(xué)者的廣泛研究。全橋DC/DC變換器因其輸出功率高而且能夠利用自身電路參數(shù)實(shí)現(xiàn)軟開關(guān)的特點(diǎn)而在中大功率場(chǎng)合得到廣泛應(yīng)用。首先進(jìn)行了 VIENNA整流器的設(shè)計(jì)與優(yōu)化。在簡(jiǎn)要介紹其原理的基礎(chǔ)上進(jìn)行了數(shù)學(xué)建模分析,隨后結(jié)合3kW系統(tǒng)對(duì)VIENNA整流器進(jìn)行了詳細(xì)的工程設(shè)計(jì),包括直流側(cè)電容設(shè)計(jì)、LCL濾波器設(shè)計(jì)和控制系統(tǒng)設(shè)計(jì)。此外,針對(duì)電網(wǎng)電壓畸變引起的輸入電流畸變,采用了一種結(jié)合VIENNA整流器控制環(huán)路的指定次諧波消除法,該方法在諧波旋轉(zhuǎn)坐標(biāo)系下提取指定次諧波分量,繼而通過(guò)閉環(huán)得到諧波電流指令值,隨后將其變換到基波坐標(biāo)系下進(jìn)行指定次諧波優(yōu)化。針對(duì)LCL濾波器存在的諧振問(wèn)題,通過(guò)引入無(wú)源阻尼的方法以抑制諧振尖峰,增加系統(tǒng)穩(wěn)定性。在全橋DC/DC變換器的設(shè)計(jì)與優(yōu)化中,首先簡(jiǎn)要介紹其拓?fù)浣Y(jié)構(gòu)和雙極性控制的工作原理,隨后通過(guò)數(shù)學(xué)建模分析推導(dǎo)出小信號(hào)模型。通過(guò)引入交錯(cuò)并聯(lián)技術(shù),降低原邊開關(guān)管電壓應(yīng)力和副邊整流二極管電流應(yīng)力同時(shí)降低了總電感電流紋波,損耗和應(yīng)力也可均衡地分配到多個(gè)電路模塊和磁性元件上,有利于電源的散熱設(shè)計(jì)。隨后給出了濾波電感設(shè)計(jì)、儲(chǔ)能元件設(shè)計(jì)、隔直電容設(shè)計(jì)、變壓器設(shè)計(jì)、換向橋設(shè)計(jì)以及控制系統(tǒng)設(shè)計(jì)的方法,并在MATLAB/Simulink仿真平臺(tái)上進(jìn)行了驗(yàn)證。針對(duì)輸出電流過(guò)零換向前因依靠輸出電容自然放電的特點(diǎn)而產(chǎn)生換向畸變的問(wèn)題,采用了輸出電流過(guò)零前功率器件高頻短路的方法以實(shí)現(xiàn)快速放電,優(yōu)化輸出電流畸變。最后,按照工程設(shè)計(jì)中的具體參數(shù)搭建了 3kW穩(wěn)流源實(shí)驗(yàn)平臺(tái)并進(jìn)行了工程設(shè)計(jì)和優(yōu)化方法的有效性驗(yàn)證。
[Abstract]:In this paper, the design and implementation of 3kW stabilized current source converter are presented, and the design and optimization of VIENNA rectifier in front stage of 3kW source and full bridge DC/DC converter in rear stage are carried out respectively. The topology of VIENNA rectifier is a three-level circuit. With the advantages of low switching stress, low distortion of total harmonic of input current, high power factor and simple structure, it has been widely studied by scholars at home and abroad. Full-bridge DC/DC converters are widely used in medium and high power applications because of their high output power and the ability to use their own circuit parameters to realize soft switching. First, the design and optimization of VIENNA rectifier are carried out. Based on the brief introduction of its principle, the mathematical modeling and analysis are carried out, and then the detailed engineering design of the VIENNA rectifier is carried out in combination with the 3kW system, including the design of the DC side capacitance, the design of the LCL filter and the design of the control system. In addition, aiming at the input current distortion caused by the voltage distortion of the power network, a specified subharmonic elimination method combined with the VIENNA rectifier control loop is adopted. The method extracts the specified sub-harmonic component in the harmonic rotation coordinate system. Then the order value of harmonic current is obtained by closed loop and then transformed to the fundamental coordinate system to optimize the specified subharmonics. Aiming at the resonance problem of LCL filter, a passive damping method is introduced to suppress the resonance spike and increase the stability of the system. In the design and optimization of full-bridge DC/DC converter, the topology and the working principle of bipolar control are briefly introduced, and then the small-signal model is derived by mathematical modeling. By introducing the staggered parallel technique, the voltage stress of the primary side switch tube and the current stress of the auxiliary side rectifier diode are reduced, while the total inductance current ripple is reduced, and the loss and stress can be evenly distributed to many circuit modules and magnetic elements. It is beneficial to the heat dissipation design of power supply. Then, the design of filter inductor, energy storage element, direct capacitance design, transformer design, commutation bridge design and control system design are given, and verified on MATLAB/Simulink simulation platform. In order to solve the problem of commutation distortion caused by output capacitance natural discharge, the high frequency short circuit method of output current zero crossing power device is adopted to realize fast discharge and optimize output current distortion. Finally, according to the specific parameters of the engineering design, the experimental platform of 3kW steady current source is built and the validity of the engineering design and optimization method is verified.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM46

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本文編號(hào)：2425043