Harmonic Analysis Of Distributed Photovoltaic Generation System Power

The pollution-free energy such as solar energy and marsh gas,etc deeply into the production and life by the technologies gradually.Firstly,this paper introduces and studies the development of harmonic analysis,the development background of green energy,such as distributed solar energy and biogas.The possibilities of harmonic were compared by the characteristics of different power generation power.In view of the international photovoltaic power quality harmonic standards,the harmonic research at home and abroad were compared to summarize problem which should be solved further.The power generations of distributed generation are different,but mostly direct current(dc)and alternating current(ac)need to be transformed.Due to the uncertain factors of the distributed photovoltaic power generation system,it may carry a large number of harmonics,So the quality of distributed generation and its energy utilization greatly reduced In this paper,distributed photovoltaic power generation system was chosen as the research object,analyzed as the harmonic characteristics of power generation process,the mathematical model and simulation of photovoltaic power generation system were presented,and the characteristic curves of photovoltaic cells under the influence of illumination intensity were verified.Analysis and compares different methods and algorithms of harmonic,the traditional Fourier transform were used to study the distributed photovoltaic power generation system.In this paper,based on the transform,the characteristics of synchronous acquisition and asynchronous acquisition under different conditions were analyzed,by the influence of spectrum leakage and fence effect on Harmonics,using the interception function of the window function such as the side lobe value,the main lobe value and the side lobe attenuation velocity,from the window of Hamming,Hanning,and 3 order of 4 Nuttall.An improved convolution window algorithm was proposed and the flow of harmonic analysis was introduced in details,then simulated and validated.Comparing with others,the algorithm had superiority in detection of weak harmonic amplitude and simplified.Finally comparative and simulation analysis,aiming at the existence of inter harmonics in power generation system among the others,effectively enhance the harmonic analysis of distributed photovoltaic power generation system will be have a great significance for the practical application.