Research on Active Filter for Supraharmonics Suppression of Power Grid

With the deepening trend of power electronics in the power system, a large number of harmonics up to the switching frequency flow into the power grid. This causes high-frequency resonances in the power grid, and results in abnormal operation of the grid-connected power electronic devices. The common PWM active power filter is difficult to deal with the 2.5kHz ~150kHz supraharmonics. In this paper, the filter topology suitable for processing 2.5kHz ~150kHz supraharmonics is studied for the first time. The main circuit design is based on the shunt hybrid filter topology, of which active and passive parts connect in series. The feasibility of the main circuit form of compensation signal generated by linear amplification method is analyzed. The validity of the proposed filter is verified by simulation and experiment.