PROVISION OF ELECTROMAGNETIC COMPATIBILITY OF A HIGH-POWER SOFT STARTER WITH VESSEL’S POWER SYSTEM IN DYNAMIC MODES

A soft starter-fed high voltage induction motor drive of a ship bow thruster is simulated. The synthesis procedure and switching methodology of a C-type filter are proposed to ensure the electromagnetic compatibility of the electric drive with the ship electrical power system in transient and steady-state conditions. Analysis shows that, suppression of high-frequency components in transients, and maintaining the power factor at the optimum level in steady-state operation is reasonable by using a 5th-harmonic capacitive filter, ensuring the appropriate switching of the filter elements simulta-neously with the connection of the by-pass contactor. The filters of the 7th, 11th/13th harmonics are selected in such a way to ensure that the total harmonic distortion of the line current and voltage meet the standards defined by IEC. References 9, figures 2.