Question

In the series-inverter control method

(a) two inverters are connected back-to-back

(b) the output from the inverter is taken serially

(c) output voltages of two inverters are summed up with the help of a transformer

(d) output voltages of two inverters are summed up with the help of a third inverter

I have been asked this question during a job interview.

Question is from Voltage Control in Inverters in section Inverters of Power Electronics

Answer 1

Right option is (c) output voltages of two inverters are summed up with the help of a transformer

For explanation I would say: It is a external voltage control method where the outputs of the two inverters are connected to the transformers where the secondary of the transformer sums up the two input voltages.