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How does a virtual DC bus provide negative dc voltage in transformer less inverters?

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virtual dc bus topology... C1 is real dc bus C2 is virtual dc bus
the gate pulses using Unipolar Sinusoidal PWM
The full bridge 4 switch inverter topology with the two output terminals replaced by equivalent pwm sources
How does the topology (1st pic) eliminate Common mode current found in PV panels connected to grid without isolation transformers?


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