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With the widespread application of power electronic equipment in the power grid, the harmonic problem of the power grid becomes more pronounced, reducing the efficiency of power production, transmission, and utilization, and interfering with the normal operation of the power grid. Based on the requirements of harmonic suppression and power system protection, a shunt active power filter (SAPF) is proposed as an effective harmonic suppression method. However, there are problems with impulse current and impulse voltage in the starting process of SAPF. Impulse current and impulse voltage cause the power grid and switchgear to bear greater current stress and voltage stress, which seriously affect the security and reliability of the power grid and may damage the switchgear. To effectively solve the problem of impulse current and impulse voltage, the starting process of SAPF is divided into the uncontrolled rectification stage and the transition stage. The mathematical model of the DC side of APF is established. The causes of impulse current and impulse voltage in the uncontrolled rectifier and transition phases are analyzed. By introducing voltage square, a new starting impulse suppression strategy of active power filter based on the slow rising curve is proposed, fundamentally solving the problems of impulse current and impulse voltage. Simulation results verify the effectiveness and feasibility of this method.

A Novel Starting Impulse Suppression Method for Active Power Filter Based on Slowly Rising Curve