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Title: Multilevel cascade voltage source inverter with seperate DC sources

A multilevel cascade voltage source inverter having separate DC sources is described herein. This inverter is applicable to high voltage, high power applications such as flexible AC transmission systems (FACTS) including static VAR generation (SVG), power line conditioning, series compensation, phase shifting and voltage balancing and fuel cell and photovoltaic utility interface systems. The M-level inverter consists of at least one phase wherein each phase has a plurality of full bridge inverters equipped with an independent DC source. This inverter develops a near sinusoidal approximation voltage waveform with only one switching per cycle as the number of levels, M, is increased. The inverter may have either single-phase or multi-phase embodiments connected in either wye or delta configurations.
 [1];  [2]
  1. (Oak Ridge, TN)
  2. (Knoxville, TN)
Issue Date:
OSTI Identifier:
Lockheed Martin Energy System, Inc. (Oak Ridge, TN) ORNL
Patent Number(s):
US 5642275
Contract Number:
Research Org:
Country of Publication:
United States
multilevel; cascade; voltage; source; inverter; seperate; dc; sources; separate; described; applicable; power; applications; flexible; transmission; systems; including; static; var; generation; svg; line; conditioning; series; compensation; phase; shifting; balancing; fuel; cell; photovoltaic; utility; interface; m-level; consists; plurality; bridge; inverters; equipped; independent; develops; near; sinusoidal; approximation; waveform; switching; cycle; levels; increased; single-phase; multi-phase; embodiments; connected; wye; delta; configurations; voltage waveform; fuel cell; power line; phase shifting; voltage source; phase shift; transmission systems; voltage balancing; static var; bridge inverters; source inverter; multilevel cascade; cascade voltage; dc sources; dc source; separate dc; seperate dc; power applications; /363/