A Different Three-Port DC/DC Converter for Standalone PV System

Table 1

Switching states of the converter.

Operation mode	Switches			Functions
	𝑆1	𝑆2	𝑆3
Mode 1	0	X	1	Feeding the load with 𝑉rs
	X	X	1	Charging battery and feeding load with 𝑉rs
Mode 2	0	X	X	Feeding the load from 𝑉rs and 𝑉bat
	0	X	1 or 0	Feeding the load only with 𝑉bat
Mode 3	X	0	1	Charging battery
	0	0	1	System off

“1” means “on,” “0” means “off,” and “X” means “commutating.”