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Three-Phase Inverters - PowerPoint PPT Presentation

Three-Phase Inverters. Consider three single-phase inverters in parallel, driven 120 ° apart. Three-Phase Inverter (continued). Three single-phase full bridge inverters. 12 transistors, 12 diodes, 3 transformers Could it be simpler?. Alternative (Preferred) Configuration.

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Presentation Transcript

Consider three single-phase inverters in parallel, driven 120° apart.

Three single-phase full bridge inverters

12 transistors, 12 diodes, 3 transformers

Could it be simpler?

6 transistors, 6 diodes conduction for 120° or 180°

180° Conduction

• Three transistors ON at a time

Waveforms for 180 Conduction

Phase Voltages for 180 Conduction

Waveforms for 180 Conduction

Q1, Q5, Q6 conduct

Q1, Q2, Q6 conduct

Q1, Q2, Q3 conduct

Phase Voltages for 180 Conduction

Fundamental Component

IL=√3Io is the rms load line current

Vo1= fundamental rms output line voltage

Io is the rms load phase current

Θ1 = the load impedance angle at the fundamental frequency