Harmonics Analysis And Control Of Distributed Photovoltaic Power Supply

At present, the energy shortage has become an important problem in the world, therefore, all countries will have to focus on the use of renewable energy to this subject, from the existing research situation of solar energy, wind energy utilization, and achieved certain results. This research will focus on the research of grid connected photovoltaic system that is, to make full use of the main characteristics of the main circuit of photovoltaic grid connected inverter, into the power control and reactive power compensation, this is not the way to use the photovoltaic grid connected power generation to achieve. The concern is that the use of this approach, but also can effectively reduce the loss of line.In this study, photovoltaic power generation The power system characteristics as the breakthrough and the starting point, in-depth exploration and analysis of special focus on photovoltaic harmonics. In the detection of harmonic and fundamental records distributed photovoltaic power harmonic in detail,2 to 63 times the current, voltage harmonic ratio, power quality tester through DSZB electric, power factor, reactive power, no measurement of reactive current, collect relevant data, one of which is the innovation of this paper.In the process of research, The author makes analysis of active power Filter and photovoltaic power generation principle, as a theoretical support, based on the working principle and the principle of compensation for interpretation of the active power filterclear the photovoltaic power generation and active power filter unified control strategy is formed based on the working principle of active filter in this research, the author of the photovoltaic system as the starting point and, but deep into the control of the ideological level, this also makes an in-depth analysis of photovoltaic power generation system has the following two functions, one is able to provide active power to the grid; second, reactive power compensation, active power filter for harmonic suppression (APF) in the study. In the process of research, the author uses the MATLAB simulation analysis, the simulation results have scientific, operability. In at the end of the study, focusing on interpretation of the system based on DSP hardware and software realization method.Through the completion of the above work draws the following conclusions:(1) Fourier transform is suitable for harmonic analysis, but it also exist at the same time many problems, in the practical application of harmonic analysis error should be paid more attention to. (2) harmonics in the distributed photovoltaic power with exists, the on Grid electricity quality of the existence of a certain impact, harmonic control is imperative. (3) in order to save costs, there will be no compensation of reactive power and harmonic suppression integration, adopted the on-site solution, can better protection of distributed photovoltaic grid connected system safe operation.