Study On The Problem Of Micrgrid Power Quality And Suppression Harmonic

By the environment, energy, science and technology and other factors, the microgrid will become a very important power production and transportation mode. Only to ensure its stability and quality to produce and transfer of electrical energy, can make it in the development of the bud growing process, so the microgrid power quality research is very necessary. Due to the microgrid in nonlinear load accounts for the proportion of large, coupled with massive investment in power electronic components, the harmonic problem in a number of electric energy quality problems are particularly prominent. Therefore, it is necessary to in-depth analysis and take effective measures to control.First of all, the thesis on research of microgrid structure, the analysis of the microgrid in all kinds of electric can cause quality problems, and through the established distribution network model and equivalent circuit, a detailed analysis of the parallel operation of voltage fluctuation and harmonic resonance problem. Secondly, it analyzes the influence of the micro power supply and the load on the power quality of the microgrid.In order to achieve the goal of controlling the harmonic of microgrid, the method of micro network harmonic identification is analyzed in detail. After comparing various harmonic detection methods, the ip-iq detection method based on instantaneous reactive power theory is determined, and its simulation model is built. Then, put forward the combination of LCL output filter and APF design is adopted to control microgrid harmonic components, and the optimization design of the shunt APF, reduce the capacity of APF, thereby reducing the investment cost of equipments. Finally, through Simulink simulation software to build a simulation model for the suppression scheme of harmonic, through simulation results prove the validity of the microgrid harmonic suppression method.