Patent ID: 8130518
Filing Date: 2012-03-06
Classification: H02M

Abstract:
1. An electric power conversion system for converting dc electric power from a plurality of unstable dc sources to ac power for injection into an electric power grid, the system comprising: a plurality of regulated current source inverters, each one of the plurality of regulated current source inverters having a plurality of switching devices for producing a multiple phase ac output, the plurality of unstable dc sources supplying input power to each one of the plurality of regulated current source inverters, the multiple phase ac output of each one of the plurality of regulated current source inverters operating synchronously with the voltages of the electric power grid, the commutation of the plurality of switching devices in each one of the plurality of regulated current source inverters sequenced to produce multiple phase ac output currents from each one of the plurality of regulated current source inverters; and at least one transformer for phase shifting the multiple phase ac output currents from all of the plurality of regulated current source inverters for producing three phase currents for injection into the electric power grid, the three phase currents having a multi-step waveform, whereby increasing the number of the plurality of regulated current source inverters decreases the total harmonic distortion of the multi-step waveform.