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Title: Voltage balanced multilevel voltage source converter system

A voltage balanced multilevel converter for high power AC applications such as adjustable speed motor drives and back-to-back DC intertie of adjacent power systems. This converter provides a multilevel rectifier, a multilevel inverter, and a DC link between the rectifier and the inverter allowing voltage balancing between each of the voltage levels within the multilevel converter. The rectifier is equipped with at least one phase leg and a source input node for each of the phases. The rectifier is further equipped with a plurality of rectifier DC output nodes. The inverter is equipped with at least one phase leg and a load output node for each of the phases. The inverter is further equipped with a plurality of inverter DC input nodes. The DC link is equipped with a plurality of rectifier charging means and a plurality of inverter discharging means. The plurality of rectifier charging means are connected in series with one of the rectifier charging means disposed between and connected in an operable relationship with each adjacent pair of rectifier DC output nodes. The plurality of inverter discharging means are connected in series with one of the inverter discharging means disposed between and connected in an operable relationshipmore » with each adjacent pair of inverter DC input nodes. Each of said rectifier DC output nodes are individually electrically connected to the respective inverter DC input nodes. By this means, each of the rectifier DC output nodes and each of the inverter DC input nodes are voltage balanced by the respective charging and discharging of the rectifier charging means and the inverter discharging means.« less
Inventors:
 [1];  [2]
  1. (Oak Ridge, TN)
  2. (Knoxville, TN)
Issue Date:
OSTI Identifier:
871031
Assignee:
Lockheed Martin Energy Systems, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5644483
Contract Number:
AC05-84OR21400
Research Org:
LOCKHEED MARTIN ENRGY SYST INC
Country of Publication:
United States
Language:
English
Subject:
voltage; balanced; multilevel; source; converter; power; applications; adjustable; speed; motor; drives; back-to-back; dc; intertie; adjacent; systems; provides; rectifier; inverter; link; allowing; balancing; levels; equipped; phase; leg; input; node; phases; plurality; output; nodes; load; charging; means; discharging; connected; series; disposed; operable; relationship; pair; individually; electrically; respective; motor drives; power systems; voltage levels; dc output; operable relationship; dc input; motor drive; means disposed; voltage source; electrically connected; voltage level; voltage balanced; voltage balancing; speed motor; adjustable speed; adjacent pair; balanced multilevel; converter provides; /363/