本文選題：三相UPS逆變器　切入點(diǎn)：諧波分析　出處：《哈爾濱理工大學(xué)》2017年碩士論文

【摘要】：隨著經(jīng)濟(jì)的不斷發(fā)展,各行各業(yè)對(duì)電能質(zhì)量要求在不斷提升,由于不同類型用電設(shè)備的增加,市電質(zhì)量變差并且滿足不了高端用戶的要求,不間斷電源(Uninterruptible Power Supply,UPS)逐漸成為這些特殊用戶的首要選擇,對(duì)于UPS而言采取高效率和高可靠性是保證供電安全的關(guān)鍵所在,所以UPS逆變控制技術(shù)必須不斷發(fā)展以滿足人們對(duì)高質(zhì)量電源的需求。本文研究對(duì)象為三相UPS逆變器,首先介紹了UPS的現(xiàn)狀及發(fā)展趨勢(shì),分析了常見(jiàn)的逆變器控制策略及逆變器并聯(lián)的結(jié)構(gòu)和控制方式并分析了各自的優(yōu)缺點(diǎn)。其次,分別在三相靜止、兩相靜止及兩相旋轉(zhuǎn)標(biāo)系下建立三相逆變器的模型,通過(guò)對(duì)逆變器模型的解耦設(shè)計(jì)了逆變器電壓電流雙閉環(huán)PI控制器,在此基礎(chǔ)上為了滿足逆變器并聯(lián)需求,加入下垂控制以實(shí)現(xiàn)逆變器的無(wú)信號(hào)連線的并聯(lián)運(yùn)行,利用動(dòng)態(tài)向量法對(duì)下垂控制的并聯(lián)系統(tǒng)進(jìn)行小信號(hào)建模,分析了下垂系數(shù)對(duì)系統(tǒng)穩(wěn)定性的影響,并給出優(yōu)化設(shè)計(jì)方法,利用MATLAB進(jìn)行了仿真,又對(duì)逆變器并聯(lián)運(yùn)行時(shí)的均流狀態(tài)進(jìn)行了分析。雖然空間矢量調(diào)制方式(Space Vector Pulse Width Modulation,SVPWM)在逆變器的控制上相比于傳統(tǒng)的方法有著諧波畸變率小的特點(diǎn),但對(duì)于脈寬調(diào)制控制的電壓型逆變器,其輸出不可避免的會(huì)含有大量的諧波,本文通過(guò)數(shù)學(xué)推導(dǎo)及仿真分析影響輸出電壓諧波的因素,包括調(diào)制電壓,調(diào)制頻率以及死區(qū)效應(yīng)的影響,并提出死區(qū)補(bǔ)償?shù)姆桨�。最�?在理論分析的基礎(chǔ)上,進(jìn)行了硬件實(shí)驗(yàn),設(shè)計(jì)了硬件電路及軟件控制部分,硬件部分包括電壓電流采樣電路,保護(hù)電路,驅(qū)動(dòng)電路等,軟件設(shè)計(jì)基于TI的SYS/BIOS實(shí)時(shí)操作系統(tǒng),利用TMS320F28335高性能浮點(diǎn)型DSP芯片實(shí)現(xiàn)了基于空間矢量調(diào)制方式的逆變器的控制。
[Abstract]:With the development of economy, the requirements of power quality in all kinds of industries are increasing. Because of the increase of different types of power equipment, the quality of electricity becomes worse and can not meet the requirements of high-end users. Uninterruptible Power supply (ups) has gradually become the first choice for these special users. For UPS, high efficiency and high reliability is the key to ensure the security of power supply. Therefore, UPS inverter control technology must be continuously developed to meet the needs of high quality power supply. In this paper, three-phase UPS inverter is studied. Firstly, the status quo and development trend of UPS are introduced. The common inverter control strategies, the structure and control mode of parallel inverter are analyzed, and their advantages and disadvantages are analyzed. Secondly, the models of three-phase inverter are established under three-phase static, two-phase static and two-phase rotating scale respectively. A voltage and current double closed loop Pi controller is designed by decoupling the inverter model. In order to meet the parallel requirements of the inverter, the droop control is added to realize the parallel operation of the inverter without signal connection. The dynamic vector method is used to model the droop control parallel system with small signal. The influence of sag coefficient on the stability of the system is analyzed, and the optimal design method is given. The simulation is carried out by MATLAB. The current sharing state of the inverter in parallel operation is also analyzed. Although space Vector Pulse Width modulation (SVPWM) has the characteristics of less harmonic distortion than the traditional method in the control of the inverter. However, for the voltage source inverter controlled by pulse width modulation, the output will inevitably contain a lot of harmonics. This paper analyzes the factors affecting the output voltage harmonics, including the modulation voltage, by mathematical derivation and simulation. The effect of modulation frequency and dead-time effect is proposed. Finally, on the basis of theoretical analysis, the hardware experiment is carried out, and the hardware circuit and software control part are designed. The hardware part includes voltage and current sampling circuit. Protection circuit, drive circuit and so on, software design based on TI SYS/BIOS real-time operating system, using TMS320F28335 high performance floating-point DSP chip to realize the inverter control based on space vector modulation.
【學(xué)位授予單位】：哈爾濱理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TM464;TN86

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