分布式光伏直流电源及并网逆变器的控制研究电气工程专业论文.docxVIP

河北科技大学硕士学位论文 河北科技大学硕士学位论文 万方数据 万方数据 万方数据 万方数据 AbstractNow,with Abstract Now,with the increasing fossil energy,deterioration of ecoiogical env的nment．haze around the grave，development and utilization of new energy grad砌ly into people’s V1slon，get eVeryone’s attention．Wherein the clean，environmentally friendly new energy photoelectric be actively developed．photovoltaic power generation gradually expaIld也e scale,showed a rising trend， Solar energy as a clean green ener烈 So 1t 1¨ery important and necessary for US to research the key of technologies，This p撇 focuses on the study of distributed photovoltaic DC power supply and the con仃01 of grid inverter． A brief introduction tO the photovoltaic cell works and classification；Detailed analysis of the different e)(temal conditions of the photovoltaic cell I-V and P-V c上1aractenStlc curve；Analysis of several conventional Maximum Power Point 1‰k洫g algorithm，this selection of incremental conductance and the impact analysis of temperature，light intensity changes in the output power generated by the PV system． Simple analysis of the grid-inverter configuration，and network requiremen_tS．也e maln circuit，Several common current tracking methods are described，On this basis．the paper puts forward the compensation method of power network voltage feed forward，and for the four control modes are built four simulation models．Finally,the results of the experiment are summarized．the power两d voltage feed forward compensation control mode based on PLL technology is the best and low harrnomc content,excellent d1I，Il砌c performance；At last，the detection of the isolated island effect is introduced，It f．0cuSes on the active islanding detection method for Auto Frequency Drift(AFD)me廿lod，a11d也e periodic perturbation method used in this paper．As well to the principle of the method to do a brief analysis，build a simulation model in Matlab to do experiment． Key words Photovoltaic power generation；Matlab simulation；MPPT；Grid collIlected inverter；Island de