二极管箝位型三电平三相光伏并网逆变器的研究
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摘要
随着能源危机的加剧以及人类生存环境的不断恶化,大力发展太阳能光伏发电技术已成为必然趋势,其中光伏并网逆变器的开发与研究备受全球学者的关注。二极管箝位型三电平光伏并网逆变器由于具有更好的输出电能质量、谐波含量少、输出容量大等优点,广泛应用于可再生能源发电及高压大功率场合。本文对二极管箝位型三电平逆变器的拓扑结构及并网控制策略进行了深入分析与研究。
     本论文以二极管箝位型三电平三相逆变器的拓扑结构为基础,介绍了三电平逆变器的工作原理,重点分析了空间电压矢量脉宽调制(SVPWM)技术,给出了空间矢量所在扇区的判断方法,推算出了各电压矢量的作用时间,最后对矢量作用顺序进行了优化。针对三电平拓扑固有的中点电位不平衡问题,本文归纳、总结了造成中点电位不平衡的主要原因,分析了空间各矢量对中点电位产生的影响,最后给出了一种常用的中点电位精确控制方法——平衡因子法,即通过引入平衡控制因子,调整正、负短矢量在一个控制周期内的作用时间,使中点电位在可控范围内波动,并通过仿真和实验验证了这种方法的可行性。
     本文建立了二极管箝位型三电平三相逆变器的动态数学模型,通过Park变换与Clark变换,将逆变器各交流变量从ABC三相静止坐标系变换到dq旋转坐标系,从而得到了系统的各直流变量,便于控制系统设计。在此基础上,研究了基于电网电压定向的矢量控制(VOC)策略,采取电压外环与电流内环相结合的双闭环控制结构,确保了系统可靠运行,并可以有效地进行有功功率、无功功率调节。
     本文研制了一台10KW二极管箝位型三电平三相逆变器系统样机,并对系统样机软、硬件设计分别作了介绍,其中硬件部分包括控制电路、驱动保护电路以及系统采样电路;软件部分包括循环主程序、中断服务程序以及SVPWM控制子程序。最后通过实验分析,验证了本论文所论述的各项控制策略的有效性与准确性。
With the energy crisis and the environment becoming more and more serious, therapid development of photovoltaic grid-connected technology has become theinexorable trend, and the scholars all over the world pay more attention to the study ofphotovoltaic grid-connected inverters. Due to the advantages of better power quality,lower harmonic components and higher voltage-capability, the Neutral Point Clamped(NPC) three-level inverters are widely used in the high-voltage and high-power andrenewable energy generation fields. The topology and controlling strategies areanalyzed and studied deeply in this paper.
     On the basis of the topology of NPC three-level inverter, this paper introduces theworking principle of three-level three-phase inverter, and then analyzes the SpaceVoltage Vector Pulse-Width Modulation (SVPWM) technology specifically. Thejudgment among sections and the time for working of every space vector are all given inthe paper. For the problem of neutral point voltage imbalance, this paper summarizesthe causes leading to the imbalance and proposes an accurate neutral point voltagecontrolling method: balanceable factor. The method controls the neutral point voltage ina reasonable range through adjusting the working time of positive small vector andnegative small vector, and the feasibility is demonstrated through the simulation andexperiment.
     This paper establishes a dynamic math model for the NPC three-level three-phaseinverter and all the variables of the inverter are transformed from ABC three-phaseimmobile coordinate system to dq synchronous rotating coordinate system throughthe Park and Clark transformation. Then this paper studies the grid-connectedcontrolling strategy: the indirect Voltage Oriented Control (VOC). The strategy adopts acontrolling scheme that the outer DC voltage control loop and internal current loopwork in coordination. With the strategy, the NPC three-level inverter could work reliably and the active power and the reactive power can also be modulated effectively.
     This paper designs a10KW NPC three-level three-phase inverter, and the hardwareand the software of the inverter are introduced respectively. The hardware includes thecontrol unit, driving protection unit and the signal sampling unit of the system and thesoftware includes the main loop program, interrupt service program and the SVPWMsubprogram. Through a lot of experiments and the analysis of waves, the availabilityand accuracy of the all strategies proposed in this paper are demonstrated effectively.
引文
[1]李安定.太阳能光伏发电系统工程[M].北京:北京工业大学出版社,2001.
    [2]张兴,张崇巍,孙本新.采用电流寻优的MPPT光伏阵列并网逆变器的研究[J].太阳能学报,2001,22(3):306-310.
    [3]李春鹏,张廷元,周封.太阳能光伏发电综述[J].电工材料,2006,(3):45-48.
    [4]王长贵,崔容强,周篁.新能源发电技术[M].北京:中国电力出版社,2003.
    [5]王飞.单相光伏并网系统的分析与研究[D].合肥:合肥工业大学,2005.
    [6]赵争鸣,刘建政,孙晓瑛,衰立强.太阳能光伏发电及其应用[M].北京:科学出版社,2005.
    [7]瞿国华.发达国家新能源政策的调整及其启示[J].中外能源,2010,15(l):20-33.
    [8]魏建明.德国光伏产业发展概况[J].太阳能,2006,(4):55-56.
    [9] Sanidad L, Parsons R, Baghzod Y, Eoehm R. Effect of On/Off Charge Controller onStand-Alone PV System Performance[C]. Energy Conversion EngineeringConference and Exhibit,2000,(2):1497-1505.
    [10]李文婷,刘宏,陈慧玲.国内外太阳能光伏发电发展综述[J].青海电力,2004,23(4):3-6.
    [11]李晓刚,冯绍瑞.中国光伏产业发展的技术经济分析[J].工业技术经济,2007,26(7):120-123.
    [12]王长贵.中国光伏产业的发展与挑战[J].太阳能,2008,(9):6-10.
    [13]赵玉文,吴达成,王斯成.中国光伏产业发展研究报告(2006-2007)(下)[J].太阳能,2008,(8):6-13.
    [14]Nabae A, Takahashi I, Akagi H. A New Neutral-Point-Clamped PWM Inverter[J].IEEE Transaction on Industry Application,1981,17(5):518-523.
    [15]韩安荣.通用变频器及其应用[M].北京:机械工业出版社,2002.
    [16]李永东,肖曦,高跃.大容量多电平变换器——原理·控制·应用[M].北京:科学出版社,2005.
    [17]王兆安,黄俊.电力电子技术[M].北京:机械工业出版社,2002.
    [18]陈伯时,陈敏逊.交流调速系统[M].北京:机械工业出版社,1998.
    [19]陶生桂,杨超.二极管箝位式多电平逆变器PWM控制技术分析[J].电力电子技术,2005,39(5):7-10.
    [20]Newton C, Sumner M. Neutral point control for multilevel theory design andoperational limitation[C]. IEEE Industry Applications Society Annual Meeting,1997,10(2):1336-1343.
    [21]Steinke J K. Use of a LC Filter to Achieve a Motor-friendly Performance of thePWM Voltage Source Inverter[J]. IEEE Transactions on Energy Conversion,1999,14(3):649-654.
    [22]Liang Yiqiao, Nwankpa C O. A power-line conditioner based on flying-capacitormultilevel voltage-source converter with phase-shift SPWM[J]. IEEE Transactionon Industry Application,2000,36(4):965-971.
    [23]Peng Fangzheng. A generalized multilevel inverter topology with self-voltagebalancing[J]. IEEE Transaction on Industry Application,2001,37(2):611-618.
    [24]周京华,扬振,苏彦民.级联型大功率逆变电源数字化实验系统的研制[J].电力电子技术,2004,38(5):1-4.
    [25]Dante C, Madrio M, Luciano P. Sliding mode multilevel control for improvedperformances in power conditioning systems[J]. IEEE Transaction on PowerElectronics,1995,10(4):453-463.
    [26]吴洪洋,何湘宁.高功率多电平变换器的研究和应用[J].电气传动,2000,30(2):7-12.
    [27]Tolbert L M, Habetler T G. Novel multilevel inverter carrier-based PWMmethods[J]. IEEE Transaction on Industry Application,1999,35(5):1098-1107.
    [28]Celanovic N, Boroyevich D. A fast space-vector modulation algorithm formultilevel three-phase converters[J]. IEEE Transaction on Industry Application,2001,37(2):637-641.
    [29]Holmes D G. The significance of zero space vector placement for carrier-basedPWM schemes[J]. IEEE Transactions on Industry Applications,1996,32(5):1122-1129.
    [30]周京华,杨振,苏彦民.多电平逆变器多载波PWM技术的研究[J].浙江大学学报,2005,39(7):1025-1030.
    [31]Beig A R, Ranganathan V T. Influence of Placement of Small Space Vectors on thePerformance of PWM Techniques for Three Level Inverters[C]. IndustrialElectronics Society, IECON '03, the29th Annual Conference of the IEEE,2003:2764-2770.
    [32]薄保中,苏彦民.三电平逆变器的分析与控制[J].电气传动,2003,(2):14-17.
    [33]薛旭恒. NPC三电平逆变器SVPWM控制策略的研究[D].北京:北京交通大学,2009.
    [34]王珍.基于DSP控制的三电平逆变器的研究[D].西安:西安科技大学,2009.
    [35]Jae H S, Chang H C, Dong S H. A New Simplified Space Vector PWM Method forThree-level Inverters[J]. IEEE Transaction on Power Electronics,2001,16(4):545-550.
    [36]Helle L, Munk-Nielsen S, Enjeti P. Generalized discontinuous DC-link balancingmodulation strategy for three-level inverters[C]. Power Conversion Conference,2002,2(1):359-366.
    [37]刘凤君.多电平逆变技术及其应用[M].北京:机械工业出版社,2007.
    [38]王志鹏.三电平逆变器控制策略研究[D].上海:同济大学,2005.
    [39]陈伯时.电力拖动自动控制系统[M].北京:机械工业出版社,2006.
    [40]徐德鸿.电力电子系统建模与控制[M].北京:机械工业出版社,2006.
    [41]张晔.三电平逆变器控制方法与中点电位平衡的研究[D].北京:北京交通大学,2009.
    [42]刘亚军.三电平逆变器SVPWM控制策略的研究[D].武汉:华中科技大学,2008.
    [43]Song Qiang, Liu Wenhua, Yu Qingguang. A neutral-point potential balancingalgorithm for three-level NPC inverters using an analytically injected zero-sequencevoltage[C].8th Annual IEEE, APEC2003,(1):228-233.
    [44]宋文祥,陈国呈,武慧.一种具有中点平衡功能的三电平空间矢量调制方法及其实现[J].中国电机工程学报,2006,26(12):95-100.
    [45]宋强,刘文华,严干贵,等.基于零序电压注入的三电平NPC逆变器中点电位平衡控制方法[J].中国电机工程学报,2004,24(5):57-62.
    [46]林磊,邹云屏,钟和清,邹旭东,丁凯.二极管箱位型三电平逆变器控制系统研究[J].中国电机工程学报,2005,25(25):34-39.
    [47]周文生.中点箝位型三电平逆变器控制方法的综合研究[J].电气传动自动化,2008,(30):6-15.
    [48]王广柱.二极管箝位式多电平逆变器直流侧电容电压不平衡机理研究[J].中国电机工程学报,2002,22(12):111-117.
    [49]赵慧杰.载波PWM方法三电平逆变器中点电位控制研究[J].电力电子技术,2008,41(3):28-30.
    [50]宋文祥,陈国呈,束满堂,丁肖宇.中点箝位式三电平逆变器空间矢量调制及其中点控制研究[J].中国电机工程学报,2006,26(5):106-109.
    [51]Lee Y H. A Novel SVPWM Strategy Considering DC-link Balancing for aMulti-level Voltage Source inverter[C]. APEC99,1999:515-519.
    [52]窦真兰,张同庄,凌禹.三电平NPC整流器空间矢量脉宽调制及中点电位平衡控制[J].电力自动化设备,2008,28(2):65-69.
    [53]姜卫东,王群京.中点箝位型三电平逆变器在空间矢量调制时中点电位的低频振荡[J].中国电机工程学报,2009,29(13):49-52.
    [54]Newton C, Summer M. A novel arrangement for balancing the capacitor voltages ofa five level diode clamped inverter[C].7th International Conference on PowerElectronics and Variable Speed Drives,1998:465-470.
    [55]张瑾,齐铂金. Z源三电平中点箝位逆变器中点电位平衡控制方法[J].中国电机工程学报,2010,30(12):7-11.
    [56]禹华军,潘俊民. PWM整流技术在光伏并网发电系统中的应用[J].电力电子技术,2005,39(6):132-135.
    [57]徐德鸿.电力电子系统建模及控制[M].北京:机械工业出版社,2005.
    [58]李明.多电平光伏逆变器的并网控制策略研究[D].上海:上海交通大学,2012.
    [59]冯丽超,李永东,王琛琛,等.三电平PWM整流器双闭环控制系统的研究[J].电力电子技术,2008,42(8):52-54.
    [60]康华光.电子技术基础——模拟部分[M].北京:高等教育出版社,2003.
    [61]张兴,曹仁贤,等.太阳能光伏并网发电及其逆变控制[M].北京:机械工业出版社,2010.
    [62]K.N. Areerak, S.V. Bozhko, G.M. Asher. DQ-Transformation Approach forModeling and Stability Analysis of AC-DC Power System with Controlled PWMRectifier and Constant Power Loads[C]. International Power Electronics andMotion Control Conference (EPE-PEMC2008),2008:2049-2051.
    [63]张崇巍,张兴. PWM整流器及其控制[M].北京:机械工业出版社,2005.
    [64]裘锦勇,宋文祥,韩杨,等.基于电压空间矢量的三电平PWM整流器研究[J].电力系统保护与控制,2009,37(13):58-62.
    [65]景小萍,高庆华.三相PWM整流器双闭环PI调节器的新型设计[J].通信电源技术,2010,27(2):44-48.
    [66]刘和平,刘平,王华斌,严利平.数字信号控制器原理及应用——基于TMS320F2808[M].北京:北京航空航天大学出版社,2011.
    [67]苏奎峰,吕强,常天庆,张永秀. TMS320X281X——DSP原理及C程序开发[M].北京:北京航空航天大学出版社,2008.

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