Based on the fundamental current detection scheme of aviation active power filter, this paper studies the influence of the accuracy of fundamental compensation current on harmonic compensation. The compensation principle of fundamental current is theoretically analyzed, and the influence of the phase and amplitude of injected compensation current on harmonic compensation effect when there is an error with the actual fundamental current is analyzed. On the basis of theoretical analysis, the influence of injected compensation current phase or amplitude on harmonic compensation in single-phase system when there is a certain offset with fundamental current is simulated and analyzed. Based on this, the detection of fundamental current is required to meet the requirements of phase and amplitude at the same time to achieve better compensation effect. At the same time, based on simulation analysis, the open-loop experiment of single-phase aviation active power filter system is verified on the influence of phase and amplitude offset, and the experimental results are basically consistent with the conclusions of simulation analysis. According to the results of simulation and experiment, higher accuracy requirements are put forward for the detection of fundamental compensation current, and the design of fundamental compensation current detection is carried out on this basis.
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