Study On Harmonic Control Method Of Active Filter Based On Adaptive Algorithm

Due to the increase of the nonlinear load in the power supply system,the harmonic pollution in the power grid is also becoming increasingly serious and the quality of power supply is reduced.So,there is an urgent need for harmonic detection and management to reduce its negative impact on power supply.However,due to various limitations,the traditional filtering technology cannot meet the requirements of modern market governance.Therefore,new active power filters meeting the requirements are on the stage.As a device that can dynamically compensate for harmonic pollution,active filters can compensate for the lack of passive filtering,which has been widely recognized by the market.This paper first introduces the classification and working principle of parallel APF,and then draws the conclusion that harmonic detection and control strategy is necessary for harmonic compensation,followed by harmonic detection and compensation current control.In the harmonic detection from the steepest descent method is analyzed,then introduces two common algorithms,namely the least mean square algorithm and recursive least squares algorithm,through the simulation comparison of the above two algorithms and the analysis of the commonly used and variable-length least-mean-squared algorithm with superior performance,this paper studies the new affine projection algorithm and applies it to harmonics for the first time.Current detection.in the control strategy,in order to ensure the output current of current real-time tracking,this paper uses timing comparison hysteresis mode to control the compensation current,at the same time in order to maintain the normal work of active power filter in the control system with DC voltage control link,and the main circuit parameters of system Unified research.Finally,using Matlab to verify the proposed algorithm.The simulation results show that the new algorithm and control strategy proposed in this paper have some practical value for the harmonic detection and control of active power filter.