Article

Harmonic mitigation using 12-pulse AC-DC converter in vector-controlled induction motor drives

Dept. of Electr. Eng., Indian Inst. of Technol., New Delhi, India
IEEE Transactions on Power Delivery (Impact Factor: 1.66). 08/2006; DOI: 10.1109/TPWRD.2005.860265
Source: IEEE Xplore

ABSTRACT In this paper, a novel autotransformer with a reduced kilovolt-ampere rating is presented for harmonic current reduction in twelve-pulse ac-dc converter-fed vector-controlled induction motor drives (VCIMDs). Different transformer arrangements for 12-pulse-based rectification are also studied and a novel harmonic mitigator capable of suppressing fifth, seventh, and 11th (most dominant harmonics) in the supply current is presented. The design procedure for the proposed autotransformer is presented to show the flexibility in the design for making it a cost-effective replacement suitable for retrofit applications, where presently a six-pulse diode bridge rectifier is being used. The effect of load variation on VCIMD is also studied to demonstrate the effectiveness of the proposed harmonic mitigator. A set of power-quality indices on input ac mains and on a dc bus for a VCIMD fed from different 12-pulse ac-dc converters is given to compare their performance.

14 Bookmarks
 · 
1,320 Views
  • [Show abstract] [Hide abstract]
    ABSTRACT: Multipulse rectifiers can replace a conventional six pulse three-phase rectifier (diode bridge) providing a DC voltage with low ripple, low Total Harmonic Distortion of current (THDi) and a high Power Factor (PF). In this context is presented a multipulse rectifier with generalized Delta-differential autotransformer topology, which can provide any level of DC output voltage for any level of three-phase AC input voltage. This paper presents all the possible configurations for Delta topology in order to choose, through graphics, one configuration that presents reduced weight and volume. The average voltage on the DC bus must be compatible with the DC voltage in the six pulse rectifier used in commercial ASDs. Therefore, it is possible to apply the retrofit technique to replace the conventional bridge rectifier by the proposed multipulse rectifier. Based on mathematic models and simulation results, an 18-pulse rectifier with Delta topology, 220 V of line voltage, 315 V of DC output, and rating 2.5 kW of power was designed, implemented and applied for three different commercial ASDs. Experimental results as voltage and current waveforms and results about PF and THDi will be presented.
    Industry Applications (INDUSCON), 2012 10th IEEE/IAS International Conference on; 01/2012
  • [Show abstract] [Hide abstract]
    ABSTRACT: A 12-Pulse Converter generally uses a phase-shifting transformer to get two sets of three-phase voltages, but the magnitude of the line current harmonic is too high. In this paper, a new type of 12-Pulse Converter featuring a rotating magnetic field transformer is presented. The design is based on the rationale of the induction machine, which can effectively reduce the line current harmonic and improve the power quality of the converter's DC output voltage.
    Modelling, Identification & Control (ICMIC), 2012 Proceedings of International Conference on; 01/2012
  • Source
    [Show abstract] [Hide abstract]
    ABSTRACT: A 24-pulse rectifier has been designed for high voltage, low current applications. Four 3-phase systems are obtained from a single 3-phase source using novel interconnection of conventional single-and 3-phase transformers. From two 30º displaced 3-phase systems feeding two 6-pulse rectifiers that are series connected, a 12-pulse rectifier topology is obtained. Thus, from the four 3-phase systems that are displaced by 15º two 12-pulse rectifiers are obtained that are cascaded to realize a 24-pulse rectifier. Phase shifts of 15º and 30º are made using phasor addition of relevant line voltages with a combination of single-phase and three-phase transformers respectively. PSCAD based simulation and experimental results that confirm the design efficacy are presented.

Full-text (2 Sources)

Download
184 Downloads
Available from
Jun 12, 2014