| In this paper, the main research focus is on circuit topology and control strategy.First, elaborate the current research status and future trends of APF, after introducing various types and topology, introduce APF works and several topology characteristics, comprehensive comparison of advantages and disadvantages between multi-level active filter circuits, the choice for this article cascaded multi-level structure of the main ci rcuit model.Secondly, compare details of several commonly used harmonic detection methods.Based on instantaneous reactive power theory, the principle of p-qã€ip-iq detection assa y for an improved ip-iq detection method, omit the detection part of the phase-locked l oop section, improve the detection accuracy and shorten detection time, and using MA TLAB/SIMULINK simulation software simulation compare its feasibility.Thirdly, this paper analyzes the control strategy of parallel APF, briefly hysteresis control, the triangular wave comparison tracking control, space vector pulse width m odulation, fuzzy control, neural network control, Sigma-delta modulation and SHEPW M. In this paper, a comparative analysis to determine the specific harmonic eliminatio n method SHEPWM, discussed in control principle and control characteristics, and wit h the drosophila algorithm improve the control effect SHEPWM.Finally, use MATLAB respectively parallel multi-level active filter model simulati on. Simulation results show that the proposed method is correct and effective detectio n and control methods. For a variety of situations and constant changes in load, it ca n have good harmonic compensation effect, with good prospects for development. |
