Line power quality improvement for ESP systems using multi-pulse and active filter concepts

A simple way to improve the line power quality in Electrostatic Precipitator (ESP) applications by using both the characteristics of its electrical installation and the typical ESP high power supply is presented in this work. A multi-pulse system is built by selecting a combination of suitable MV/LV distribution transformers, preserving the simplicity and reliability of the typical ESP installation. In addition, processing only about 10% of the total system apparent power, shunts Active Filters (AFs) are placed on the low voltage side of the transformer (LV) for high order harmonic-current-mitigation (>7th harmonic). In case of imbalance in the transformer loading, the AFs can also act to adjust the current 5th and 7th harmonics, which are then effectively eliminated by the multipulse system. The theory presented in this work is verified experimentally by a 12 pulse system comprising two passive rectifiers and a designed 12kVAr active filter.

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