| With the advancement in science and technology,especially the development of electronic technology,a large number of electronic products emerge,which all improve people’s living standards.With the increase of electric power equipment,more and more nonlinear electronic devices are applied to production and life,which leads to the rapid increase of nonlinear harmonics,and which is similar to environmental pollution control.With characteristics of non-linearity,impulsion and electric imbalance,the existence of harmonic has great influence on production and life.The research aims at designing a device which can eliminate the harmonic in three-phase power grid by simulation experiment.At first,the paper discusses the influence of harmonic on the three phase power system and the electric equipment.With the aggravation of the hazards in recent years,some measures must be taken to restrain and compensate harmonic.Secondly,some key technologies of the filter are analyzed in the paper,including harmonic detection,phase-locked loop control and converter control technology.p-q harmonic detection and ip-iq harmonic detection technology are introduced in detail.In order to improve the filtering effect under the condition of asymmetrical network voltage and load,an improved harmonic detection technique is introduced.On the basis of analyzing the harmonic detection scheme,considering the filter effect and the cost performance,a harmonic detection scheme is introduced.Thirdly,according to the requirements of each component of the filter,the corresponding parameters are determined,and the hardware module design and software design of the system are given.Finally,MATLAB simulation model is established according to the filter circuit design and parameter selection,the simulations are conducted on the resistive load and load condition,to observe the dynamic response and recovery time.And conducting a series of simulation,and the experimental results were analyzed. |
