Experimental test results of the 150kVA 18-pulse diode rectifier with series active power filter

The paper presents the control system and selected results of experimental tests of the ac/dc power converter consisting of 18-pulse diode rectifier on the basis of coupled reactors and a serial active power filter. Three configurations of the 150kVA converter were tested experimentally and compared: 18-pulse diode rectifier with and without additional grid reactor and the rectifier integrated with the active power filter. The applied control method of active filter significantly reduces the grid current harmonic distortion and unbalance, which is particularly advantageous at low loads and non-ideal supply voltage.