DC voltage balance control for three-level npc power converters with even-order harmonic elimination scheme

DC voltage balance control for three-level npc power converters with even-order harmonic elimination scheme

  • CN 1,921,279 A
  • Filed: 04/17/2006
  • Published: 02/28/2007
  • Est. Priority Date: 04/15/2005
  • Status: Active Application
First Claim
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1. a three stage power source converting system (100,150) comprising:

  • Be used to receive or provide the DC of DC power supply to connect (110), described DC connect (110) comprise the first and second DC terminals (112) and first and DC terminal (112) between the first and second capacitor (C of series coupled 1, C 2), described capacitor is gone up coupling at common node (0);

    Be used to receive or provide the heterogeneous AC connection (120) of polyphase source, described AC connects (120) and comprises first, second and the 3rd AC terminal (122), andThree step switch network (130) comprising;

    The first group of switchgear (130a) that is connected the coupling of (110) and described first AC terminal (122a) with described DC, one of described first group of available three state operations is with according to first group of switch controlling signal (SC A) with first AC terminal (122a) one of electrical couplings to a DC terminal (112a), DC terminal (112b) and common node (0) selectively, The second group of switchgear (130b) that is connected the coupling of (110) and described AC terminal (122b) with described DC, one of described second group of available three state operations is with according to second group of switch controlling signal (SC B) with second AC terminal (122b) one of electrical couplings to a DC terminal (112a), DC terminal (112b) and common node (0) selectively, and The 3rd group of switchgear (130c) that is connected the coupling of (110) and described the 3rd AC terminal (122c) with described DC, one of described the 3rd group of available three states operations is with according to the 3rd group of switch controlling signal (SC C) with the 3rd AC terminal (122c) one of electrical couplings to a DC terminal (112a), the 2nd DC terminal (112b) and common node (0) selectively;

    And On-off control system (140) provides many group switch controlling signals (SC) by space vector modulation, with power conversion system (100,150) operating period with open circuit mode equalizing capacitor (C 1, C 2) on voltage.

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