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Harmonic reduction mechanism at DC link of multi-pulse rectifier
Author(s): 
Pages: 69-77
Year: Issue:  4
Journal: Electric Machines and Control

Keyword:  MPRdouble-tapped inter-phase reactorIPRautotransformerharmonic reduction;
Abstract: In order to improve the ability of harmonic reduction at DC link of multi-pulse rectifier ( MPR) ,the harmonic reduction mechanism at DC link of 24-pulse rectifier with double-tapped inter-phase reactor ( IPR) was analyzed.According to the winding configuration of double-tapped IPR and Am-pere-Turn balance,the function and operation mode of double-tapped IPR were analyzed.The effect of op-eration mode on output currents of the two bridge rectifiers,input current of rectifiers,load voltage were also analyzed,and the theoretical value of turn ratio of IPR was calculated.Theoretical analysis and exper-imental results show that the conduction in turn of the two diodes connected with IPR will produce a cir-culating current to modulate the output currents of the bridge rectifiers.When the circulating current flows through the input mains,it reduces the (12k ±1)th(k is odd number) harmonics.In addition,conduction in turn of the two diodes produces an additional voltage on the load voltage,which depresses the ripple co-efficient of load voltage.Experimental results validate the correctness of theoretical analysis.
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