Detecting Method And Suppression Of Power System Harmonic

Following the development of the national economy and the living standard of people,the electric power electronics product is broadly applied to the control realm in the industry.These electric powers electronics equips to make a harmonic pollution problem within the electric power system is serious gradually.Therefore,the analysis and suppression of harnomic has been an important topic in the electric power system.Recently,it is mature that the technique of PPF is used to suppress the harmonic in most circumstances.But,PPF has many disadvantages that it is easily affected by system parameters,and it can only remove some fix harmonics.Therfore,the study APF is becoming a focus topic because of its's nice dynamic compensation.However,APF in China is not in practical stage so far.Most of the work is just the study research in theoretically.In my thesis,much is done to the dectecting method and the control function of APF.All this work makes much sense for the industrialization of APF in the following year.In this thesis,the current detecting method of instantaneous reactive power theory is discussed.Both p,q detecting method and ip-iq detecting method are analyzed by computer simulation.At the same time,selection of category and parameter of LPF are very important in current detection,so how to select them is imitating by computer.In order to improve the current tracking performance of APF,in this thesis,two current control methods for APF are proposed.they are hysteresis current control and triangular wave currnt control.It's proved that they both have good real time tracking ability by simulation.They can meet APF's working demand.Finally,it intrduce a typical harmonic model the intermediate frequency inductive stove and it's working principle.Combining the theories with actual measurement,it analyse the harmonic's character.By making use of MATLAB to build the system model,PPF and APF are put in the simulation respectively.Result proves APF is better.