A Grid-Connected Multilevel Current Source Inverter and Its Protection for Grid-Disconnection

Table 1

Switching states of the converter.

Output current	Switches
	𝑆1	𝑆2	𝑆3
Zero	1	1	1
	0	0	0
Positive	1	0	0
	0	1	0
Double positive	1	1	0
Negative	0	1	1
	1	0	1
Double negative	0	0	1

“1” means “on.”
“0” means “off.”