【摘要】：為了應(yīng)對(duì)化石燃料逐漸短缺和生存環(huán)境日益惡化的嚴(yán)峻局面,風(fēng)能、太陽能、生物質(zhì)能、地?zé)崮堋⒊毕艿瓤稍偕履茉窗l(fā)電技術(shù)得到了前所未有的飛速發(fā)展。與此同時(shí),作為電能處理關(guān)鍵部分的PWM變換器也在新能源發(fā)電系統(tǒng)中得到了各種各樣的應(yīng)用。傳統(tǒng)的電壓源型逆變器在逆變過程中對(duì)直流側(cè)蓄電池電壓的苛刻要求使得其在實(shí)際應(yīng)用中受到了極大的約束,難以滿足直流側(cè)蓄電池電壓低于電網(wǎng)電壓峰值時(shí)的并網(wǎng)要求;而傳統(tǒng)的電流源型逆變器由于其電抗器損耗大、體積大、成本高等缺點(diǎn)也在推廣、應(yīng)用中受到了一定的限制。因此功能更加多樣、控制更加靈活的逆變器成為了新能源發(fā)電系統(tǒng)領(lǐng)域極具創(chuàng)新性和挑戰(zhàn)性的研究方向之一。首先,本文提出一種適用于低輸入電壓場(chǎng)合的新型單相多模塊電壓源型逆變器拓?fù)浣Y(jié)構(gòu),詳細(xì)分析了該新型多模塊VSI系統(tǒng)工作原理及電壓輸出特性。采用交、直流混合的單極性PWM調(diào)制方式,得出交流側(cè)輸出電壓與交流調(diào)制信號(hào)之間的函數(shù)關(guān)系,為后續(xù)的VSI系統(tǒng)分析打下基礎(chǔ)。其次,詳細(xì)分析了不同模態(tài)中,單極性PWM載波調(diào)制下電路的工作模式及橋臂電流的變化規(guī)律。依據(jù)VSI系統(tǒng)中交直流側(cè)的能量守恒關(guān)系,完成了對(duì)H橋單元穩(wěn)壓電容器的參數(shù)設(shè)計(jì);通過對(duì)不同模態(tài)中的典型等效電路分析,完成了對(duì)VSI系統(tǒng)回路電感參數(shù)的設(shè)計(jì)。最后,搭建了2kW的PSIM軟件仿真系統(tǒng)和硬件實(shí)驗(yàn)平臺(tái),并完成了對(duì)新型VSI系統(tǒng)帶有穩(wěn)態(tài)負(fù)荷、階躍負(fù)荷及感性負(fù)荷時(shí)的工作特性驗(yàn)證。仿真結(jié)果和實(shí)驗(yàn)結(jié)果表明,橋臂電流變化規(guī)律與理論分析一致,H橋單元穩(wěn)壓電容器參數(shù)和VSI系統(tǒng)回路電感參數(shù)設(shè)計(jì)合理,提出的新型VSI具有較大的升壓能力并在階躍負(fù)荷、感性負(fù)荷下依然具有良好的運(yùn)行特性。
[Abstract]:In order to cope with the severe situation of the shortage of fossil fuels and the worsening of the living environment, new renewable energy generation technologies such as wind energy, solar energy, biomass energy, geothermal energy, tidal energy and so on, have been developed at an unprecedented speed. At the same time, as a key part of power processing, PWM converter has been widely used in new energy generation systems. The harsh requirements of DC side battery voltage of the traditional voltage source inverter in the process of inverter make it difficult to meet the grid connection requirements when the DC side battery voltage is lower than the peak voltage of the grid because of its great constraints in practical application. The traditional current-source inverter is also popularized because of its large reactor loss, large volume and high cost, so it is limited in application. Therefore, the inverter with more diverse functions and more flexible control has become one of the most innovative and challenging research directions in the field of new energy generation system. Firstly, a novel single-phase and multi-module voltage source inverter topology for low input voltage is proposed. The working principle and voltage output characteristics of the new multi-module VSI system are analyzed in detail. The function relationship between AC side output voltage and AC modulation signal is obtained by using AC / DC hybrid unipolar PWM modulation mode, which lays the foundation for subsequent VSI system analysis. Secondly, the operating mode of the circuit and the current variation of the bridge arm are analyzed in detail under unipolar PWM carrier modulation in different modes. According to the energy conservation relation of AC / DC side in VSI system, the parameter design of H-bridge unit voltage stabilized capacitor is completed, and the circuit inductance parameter of VSI system is designed by analyzing the typical equivalent circuit in different modes. Finally, the PSIM software simulation system and hardware experimental platform of 2kW are built, and the working characteristics of the new VSI system with steady load, step load and inductive load are verified. The simulation results and experimental results show that the current variation law of the bridge arm is consistent with the theoretical analysis, the parameters of H-bridge unit voltage stabilized capacitor and the inductance parameter of VSI system circuit are designed reasonably, and the new type of VSI has large boost capacity and step load. Under the inductive load, it still has good operation characteristics.
【學(xué)位授予單位】：東北電力大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM464

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本文編號(hào)：2397872