Distribution system for A. C. electrical energy derived from D. C. energy sources

Apparatus for distributing A.C. electrical energy to a load comprising:

• a plurality of inverter means responsive to gating signals for producing A.C. electrical energy having quasi-square waveforms;
• means for adding together the A.C. electrical energy from said plurality of inverter means to produce A.C. electrical energy having a composite waveform;
• and
• controller means for providing said gating signals to said plurality of inverter means to cause said composite waveform to approximate a sine wave in phase with and having the same amplitude as said composite waveform in that the time integral of the difference between said composite waveform and said sine wave is caused to be substantially zero in each time interval between successive instants in time when said sine wave and said composite waveform have the same value.

Apparatus for distributing A.C. electrical energy to a load comprising:

• a plurality of inverter means substantially similar to each other and each responsive to gating signals for producing A.C. electrical energy having a quasi-square waveform;
• a plurality of isolated D.C. electrical energy sources substantially similar to each other and each conductively coupled to a distinct one of said plurality of inverter means whereby the amplitudes of said quasi-square waveforms are substantially equal to each other;
• conductive coupling means for summing the A.C. electrical energy from said plurality of inverter means to produce A.C. electrical energy having a composite waveform;
• and
• controller means for providing said gating signals to said plurality of inverter means to cause said quasi-square waveforms to be substantially in phase with each other and to cause said composite waveform to approximate a sine wave in phase with and having the same amplitude as said composite waveform in that the time integral of the difference between said composite waveform and said sine wave is caused to be substantially zero in each time interval between successive instants in time when said sine wave and said composite waveform have the same value.