US 5,515,264 AGranted

Optimized high power voltage sourced inverter system

AssigneeElectric Power Research Institute, Inc.

InventorEric J. Stacey

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Abstract

A voltage sourced inverter system includes an inverter for coupling to a DC power source and an interphase transformer bank coupled to the inverter. The inverter includes a number of poles for providing discretely displaced voltage waveforms to the interphase transformer bank. A main transformer operably coupled to the interphase transformer bank transforms power therefrom into an AC power output. The interphase transformer bank may be a singular stage or a hierarchial arrangement of plural interphase transformers which combine the discretely displaced voltage waveforms to reduce selected harmonic components therefrom. The inverter may provide notched waveforms to remove additional selected harmonics from the discretely displaced voltage waveforms. A method of inverting DC power into AC power with reduced selected harmonic components is also disclosed.

Claims9

Dependent claims

A voltage sourced inverter system, comprising:

an inverter for coupling to a DC power source, said inverter having a number of poles providing a plurality of inverter output voltage waveforms discretely displaced from one another in a predetermined manner;
a main transformer for providing an AC power output of said inverter system;
and
a plurality of zig-zag interphase transformers connected between said inverter and said main transformer, each zig-zag interphase transformer including at least three modular transformers, a primary of a first modular transformer including a first primary node connected to said main transformer and a second primary node connected to a secondary of another modular transformer, a secondary of said modular transformer with a first secondary node connected to said inverter and a second secondary node connected to a primary of another modular transformer, such that each zig-zag interphase transformer of said plurality of zig-zag interphase transformers receives at least three inverter output voltage waveforms of said plurality of inverter output voltage waveforms, and generates an average output voltage therefrom for application to said main transformer.

1 more element

Dependencies are inferred from the claim text.