Purpose. Defining the relationship between the parameters of the energy storage components of the three-phase parallel power active filter and the character of current which is compensated. Methodology. The methodology includes formation of the equivalent circuit for active power filter with the analysis of the distribution of the currents as well as their components in the branches by the principle of compensation. Analysis of time diagrams of the mode parameters by the character of the load current for the scheme which matches the equivalent circuit and was published in the previous papers. Moreover, the method involves the realization of experiments in order to determine the influence of the values of capacitor voltage and inductance of the inductive components on compensation quality of the load current by the electric power network current and the analytical determination of the power distortion influence on the average value and the deviation of the capacitor voltage of the power active filter. It also involves the justification of the rate of change of load current as a critical parameter using the experimental results. Analytical determination of the rate of change of load current of the power active filter taking into account its dependence on the delay angle for thyristor converter considering active component and instantaneous value of load current. Analysis of the rate of change of load current in the power active filter with several current delay angles of the thyristor converter and comparison of it with the transient current in the power active filter scheme using certain assumptions and taking into account the presence of energy storage components. Findings. It is proved that the parameters of the circuit and the modes of the power active filter essentially depend on the rate of change of load current within a considered time interval. The results are based on the analysis of time diagrams for the mode parameters of the power parallel active filter used in the circuit with thyristor converter as a load. Originality. Influence of the rate of change of load current on the mode parameters of the power active filter, and accordingly, on the parameters of the power circuit components which should additionally be taken into account for calculations by known methods is substantiated. Practical value. It is determination of the influence of the rate of change of load current on parameters of components of the three-phase parallel power active power filter, which may be useful for their selection.

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