Research On Harmonic Detection And Suppression In Distribution Network

Nowadays,electric energy has become the most important energy in our life.However,the overall promotion of industry and science and technology,as well as people's daily living standards,with the continuous development of technical means,the same kind of problems to be solved with different power quality problems to be solved,a large number of innovative production of electrical equipment in the process of work will synchronously bring all kinds of electromagnetic interference in the power system.It will only cause power system security problems,and will seriously harm all the normal operation of power equipment.In this paper,six factors affecting the power quality are analyzed.The power quality problems are classified into transient and two directions of steady state,and the cause and harm caused by the loss of power quality are studied in detail.The causes of the generation of the harmonic generation and the influence on the electric power system are studied,and the mathematical analysis is combined.Such as Fourier transform,discrete Fourier transform and fast Fourier transform,the current popular ip-iq harmonic detection method based on instantaneous reactive power theory is emphatically studied,and a three-phase three wire system parallel active filter is established with the MATLAB software.The simulation model is simulated and analyzed under the system with mutation operation mode.The results show that the active power filter is a new power electronic device used to restraining harmonics,harmonic suppression can change the size and frequency,its application can inhibit the method to overcome the shortcomings of traditional passive power filter harmonic.Based on the instantaneous reactive power ip-iq harmonic detection method combined with the external active filter harmonic suppression measures,the total harmonic and the harmonic content of the system can be detected accurately.On this basis,the corresponding compensation current can be produced to counteract the harmonic current measured,thus the effect of the suppression is achieved,which illustrates the study in this paper.The practical feasibility of the harmonic detection and suppression scheme.Finally,on this basis,it puts forward the measures to improve the power quality of distribution network,which has theoretical significance and important practical value.