Application Of Repetitive Control In Harmonic Suppression And Reactive Power Compensation Device

With the continuous progress of power grid system,power electronic equipment has been widely used.In the aspect of transmission and distribution,the optimization of electronic equipment can make the control of power system simpler and faster,but because of its own non-linear characteristics,it increases the consumption of reactive power.In addition,in people's production and life,the application of non-linear load is more and more extensive,such as electric arc furnace,motor and various household appliances.While consuming reactive power,harmonic generation occurs,which results in waveform distortion of power grid current and affects the efficiency of power grid.Up to now,active power filter(APF)is the most widely used electronic power device in power grid system,which has the characteristics of reliable performance and flexible use.This topic takes three-phase three-wire APF system as the research object.Firstly,the structure and principle of APF system are elaborated,and then the mathematical model is established.The second-order digital Butterworth filter is used to detect harmonic and reactive currents.Then in the process of tracking and controlling the current,PI regulator is chosen to track the instruction current accurately,so as to improve the stability of the system.Finally,the simulation model is built by using MATLAB simulation system,and the final conclusion proves that the effect achieved by APF in the process of harmonic reactive power compensation is scientific and reasonable.In order to make the APF system be applied in practice,the hardware circuit of AFP is built in the experimental platform,and the control method is realized in the DSP2812.The whole main program is compiled and debugged in CCS2.2,which proves the feasibility of the experimental results.In the experimental system of AFP,the space vector control method is used to modulate the AFP,and the algorithm and program are further compiled to verify the effectiveness of its application and make contributions to improving the compensatory performance of the system.