Electromagnetic Force and Magnetostriction Analysis of Power Compensation Reactors under Harmonics

Abstract

In order to analysis the impact of harmonic currents on the magnetostriction and electromagnetic force inside power compensation reactors, numerical simulation on a 10kV/30kVar reactor was conducted. The vibration and noise mechanism, and the internal structure of the reactor are analyzed. The 3D model of the reactor for the magnetostriction and electromagnetic force simulation was established. The finite element analysis software COMSOL is employed for the calculation of the magnetic field and electromagnetic force distribution under fundamental and fifth harmonic currents. The impact of fifth harmonic current on the magnetostriction of iron core and electromagnetic force of windings is also analyzed. The simulation results shown that the 5 harmonic current aggravates the magnetostriction and electromagnetic force. The magnetostriction magnitude caused by 64A fifth harmonic is only about 10% of that caused by 165A rated 50Hz fundamental current. But the horizontal component of the electromagnetic force on the center position winding is even larger than that produced by the rated 50Hz fundamental current. This result shows that the fifth harmonic current would significantly increase the winding loose risk of the reactor.