The Optimization Design For Megawatt Grade Photovoltaic Power Plant Practice

With the increasingly exhausted non renewable resources and people's awareness of improving environmental protection,governments around the world have made strategic decisions: solar energy as a sustainable resource.Among them,the most concern is the number of photovoltaic power.Governments agree that photovoltaic power generation is the most developed new energy technology in the world.However,low efficiency is the bottleneck of large-scale PV power generation and application.Therefore,the key problem is how to effectively improve the energy generated by the photovoltaic array.How to improve the photovoltaic power generation has become a research hotspot in the field of photovoltaic power generation.Taking 10 MW photovoltaic power generation in Fuxin as an example,the efficiency and theoretical methods of solar power generation system and its main technology research are studied comprehensively and systematically.The main research results are as follows:First,the number of serial and parallel components is optimized.Under the reasonable parameters,the suitable number of serial and parallel components is selected,which effectively reduces the loss on the line,and then improves the efficiency of the power generation.At the same time,the voltage and current parameters of several different series and parallel modes are analyzed systematically and compared with the voltage and current prescribed by the system,and the suitable series and parallel connection are selected.Secondly,shorter conductor length is one of the principles to optimize the conductor length of photovoltaic modules.The smaller the current loss is,the smaller the power loss is.In the case of the same number of arrays,the arrangement of the components is different and the length of the wire required is naturally different.This optimization analysis is to compare and analyze in theory which component placement method is selected and the length of the wire required is shortest.Through simulation and analysis of the vertical row,vertical row,double row,horizontal row of two rows of four rows of lines and various parts of the loss of power,select the appropriate arrangement,and according to the arrangement of the optimal number of components in series and parallel,to minimize the loss of power.Thirdly,the intelligent support system of PV application system is optimized,combining the cost of the equipment,raw materials and labor,according to the installation data rich in weather and radiation in different geographical locations,according to the principle of "the maximum of four seasons and weak season" according to the radiation amount in the square array,the order of design is in accordance with the 1 season(year)-2 season(winter half year summer and half year)-3 quarter The volume is divided into 3 seasons: 4 seasons(spring,summer,autumn and winter)until the 12 season(month).The grid connected photovoltaic power generation system is designed.From the technical and economic selection of a reliable and operable system support scheme,it effectively improves the output efficiency of the photovoltaic array,and has a high practical value.Finally,from the analysis of the initial cost and the efficiency of the inverter,the 250 kW and 500 kW inverters are compared,and the optimization of the single inverter and the integrated inverter is selected.Finally,the comparison of the integrated inverters and the distributed inverters is carried out from the aspects of economy and efficiency,and the optimum scheme is given through the simulation of the inverse transformer type selection.