Design considerations for 12-pulse diode rectifier systems operating under voltage unbalance and pre-existing voltage distortion with some corrective measures
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In this paper design considerations for 12-pulse diode rectifier systems operating under utility voltage unbalance and pre-existing harmonic voltage distortion are discussed. For a 12-pulse diode rectifier system connected in parallel to feed a common dc link via an interphase transformer it is shown that a small amount of impedance mismatch, utility voltage unbalance or pre-existing voltage distortion drastically affects the current-sharing capability of the rectifier bridges. This in turn generates additional uncharacteristic and characteristic harmonics thereby increasing the THD. In order to mitigate these effects and ensure proper operation of diode rectifiers, specially designed line reactors termed Harmonic Blocking Reactors (HBR's) are introduced. The analysis and design procedure for HBR's are discussed. Simulation results illustrate improved performance. Experimental results from a laboratory prototype system show close agreement with theory. 1996 IEEE.