The load of iron and steel, petrochemical, metallurgy, coal, printing and dyeing industries will generate a large of harmonics during the work process, causing serious pollution to the power system and affecting the quality of electricity supply. The passive power filter device absorbs the harmonic current generated by the harmonic source and is an effective measure to suppress the harmonic pollution. The passive power filter device is mainly composed of a suitable combination of a filter capacitor, a hollow filter reactor, and a non-inductive resistor. In operation, it is connected in parallel with the harmonic source and functions as a filter and takes into account the need for reactive power compensation and voltage regulation. Because of its economical practicality, simple structure, reliable operation and convenient maintenance, it has been widely used.
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