【摘要】：三相整流電路在電化學(xué)加工、可再生能源變換以及航空航天等大功率場(chǎng)合獲得了廣泛的應(yīng)用,然而其非線性與時(shí)變性也給電網(wǎng)帶來(lái)了嚴(yán)重的諧波污染問(wèn)題。多脈波整流技術(shù)通過(guò)兩個(gè)或多個(gè)變壓器的移相作用,能夠在降低交流側(cè)輸入電流諧波的同時(shí)減小直流側(cè)輸出電壓紋波,已成為解決大功率三相整流系統(tǒng)諧波污染問(wèn)題的有效途徑。為進(jìn)一步提高多脈波整流電路的諧波抑制性能,本文在12脈波整流電路的基礎(chǔ)上,設(shè)計(jì)了基于Boost PFC型有源平衡電抗器的低諧波整流系統(tǒng),在有效抑制輸入電流諧波的同時(shí)實(shí)現(xiàn)諧波能量的回收利用。為分析AIPR原邊環(huán)流對(duì)系統(tǒng)輸入電流諧波的抑制作用,本文結(jié)合開(kāi)關(guān)函數(shù)法詳細(xì)分析了系統(tǒng)交直流側(cè)電流特性,得出系統(tǒng)交流側(cè)輸入電流與直流側(cè)負(fù)載電流以及AIPR原邊環(huán)流三者之間的函數(shù)關(guān)系,明確諧波抑制的關(guān)鍵在于控制AIPR原邊環(huán)流的幅值與相位滿足條件;并分析了環(huán)流調(diào)制對(duì)系統(tǒng)電壓特性及主要磁性器件容量的影響,與調(diào)制前的常規(guī)系統(tǒng)相對(duì)比,明確了系統(tǒng)特性。AIPR原邊環(huán)流需要通過(guò)控制副邊有源電路產(chǎn)生,本文通過(guò)分析諧波抑制時(shí)所需副邊電路的能量流動(dòng)方向及工作特點(diǎn),提出了采用雙重交錯(cuò)并聯(lián)Boost PFC電路作為副邊電路的方案。由此構(gòu)成有源平衡變換器能夠滿足環(huán)流的控制要求,顯著降低輸入電流諧波;同時(shí)能夠?qū)⒅C波能量饋送至系統(tǒng)輸出負(fù)載側(cè),以實(shí)現(xiàn)諧波能量的重新利用。對(duì)由交錯(cuò)并聯(lián)Boost PFC電路構(gòu)成的有源平衡電抗器進(jìn)行了具體設(shè)計(jì),給出了Boost電感、輸出濾波電容以及其他主要電路參數(shù)的設(shè)計(jì)方法。根據(jù)系統(tǒng)控制要求,并結(jié)合數(shù)字控制優(yōu)勢(shì),設(shè)計(jì)了基于TMS320F28027的數(shù)字控制系統(tǒng),控制輸入電流的同時(shí)完成對(duì)系統(tǒng)過(guò)流、過(guò)壓的保護(hù)。利用MATLAB/SIMULINK對(duì)所設(shè)計(jì)的系統(tǒng)進(jìn)行了仿真驗(yàn)證,并研制了一臺(tái)功率等級(jí)為9k W的實(shí)驗(yàn)樣機(jī)。實(shí)驗(yàn)結(jié)果表明,僅需加入系統(tǒng)容量2%的Boost PFC變換器,即可將系統(tǒng)輸入電流THD降低至原來(lái)的1/4左右,實(shí)驗(yàn)驗(yàn)證了所設(shè)計(jì)的系統(tǒng)在大功率整流場(chǎng)合諧波抑制的有效性。
[Abstract]:Three-phase rectifier circuits have been widely used in high power applications such as electrochemical machining renewable energy conversion and aerospace. However their nonlinear and time-varying characteristics have also brought serious harmonic pollution problems to the power grid. Multi-pulse rectifier technology can reduce the input current harmonics of AC side and the ripple of output voltage at the DC side through the phase shift of two or more transformers. It has become an effective way to solve the problem of harmonic pollution in high power three-phase rectifier system. In order to further improve the harmonic suppression performance of multi-pulse rectifier circuit, a low-harmonic rectifier system based on Boost PFC active balance reactor is designed on the basis of 12-pulse rectifier circuit. The harmonic energy can be recovered at the same time that the input current harmonics are suppressed effectively. In order to analyze the suppression effect of AIPR primary circulation on the input current harmonics of the system, the characteristics of AC / DC side current of the system are analyzed in detail with the switching function method. The functional relationship among AC input current DC load current and AIPR primary circulation is obtained. The key of harmonic suppression is to control the amplitude and phase of AIPR primary circulation. The effect of circulation modulation on the voltage characteristics of the system and the capacity of the main magnetic devices is analyzed. Compared with the conventional system before modulation, the characteristics of the system are clarified. The primary circulation of AIPR needs to be generated by controlling the auxiliary side active circuit. Based on the analysis of the energy flow direction and working characteristics of the secondary side circuit for harmonic suppression, this paper presents a scheme of using the dual interleaving parallel Boost PFC circuit as the secondary side circuit. Thus the active balance converter can meet the control requirements of the circulation and reduce the input current harmonics significantly. At the same time, the harmonic energy can be fed to the output load side of the system to realize the reuse of harmonic energy. An active balancing reactor composed of staggered parallel Boost PFC circuits is designed, and the design methods of Boost inductor, output filter capacitance and other main circuit parameters are given. According to the requirement of system control and the advantages of digital control, a digital control system based on TMS320F28027 is designed, which can control the input current and protect the system from overcurrent and overvoltage at the same time. The system is simulated and verified by MATLAB/SIMULINK, and an experimental prototype with a power level of 9kW is developed. The experimental results show that the input current (THD) of the system can be reduced to about 1 / 4 of the original input current by adding only 2% Boost PFC converter. The experimental results show that the proposed system is effective in high-power rectifier.
【學(xué)位授予單位】：哈爾濱工業(yè)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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