New harmonics current mitigation technique in induction motor driving reciprocating compressor

Reciprocating compressors produce large fluctuating torques. When a reciprocating compressor is driven by an electric motor, also the rotor of the latter is subjected to these oscillations. Synchronizing torques, damping torques and pulsating primary currents are developed due to this vibratory motion of the rotor. These nonlinearities generate harmonics in the input current. The main standards associations have issued standards and guidelines for limiting the influence of harmonics developed by electric motor driving compressors, designed for several application. To respect compliance with the requirements, a mitigation of the harmonic currents is required by the standards. In this paper, new harmonics current mitigation technique, based on hybrid active filter, is presented for induction motor driving reciprocating compressors.