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Current-forced neutral injection in a three-phase rectifier/converter

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2 Author(s)
Boys, J. ; Dept. of Electr. & Electron. Eng., Auckland Univ., New Zealand ; Mitchell, B.

A new three-phase rectifier/converter with low harmonic input currents and minimal DC voltage ripple is described. The device achieves continuous input line currents by injecting a triangular third harmonic current, derived from the DC link current, into the neutral point of a delta-star transformer at the supply. It uses a conventional six-pulse phase controlled converter, with an additional bridge of four devices in the DC link. The additional bridge also cancels much of the DC voltage ripple, allowing a much smaller DC link inductance to be used. A prototype 10 kW system, suitable for such applications as DC motor drives, load-commutated inverters, exciters for AC generators, and low-power DC links is described. Experimental results obtained from this system are compared with ideal theoretical predictions

Published in:

Electric Power Applications, IEE Proceedings -  (Volume:146 ,  Issue: 4 )

Date of Publication:

Jul 1999

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