A four quadrant operation requires:
- Two full converters connected in parallel
- Two semi converters connected in back to back
- Two full converters in series
- Two full converter connected in back to back
Correct answer: 4. Two full converter connected in back to back
Explanation:
A four-quadrant operation refers to the ability of a power converter to control power flow bidirectionally between a source and a load in all four quadrants of the voltage-current plane. These quadrants represent both the positive and negative directions of both voltage and current.
In a back-to-back connection of two full converters, each converter operates in two quadrants. By combining them in a back-to-back configuration, they cover all four quadrants. This arrangement allows bidirectional power flow, enabling control of both the direction and magnitude of power transfer between a source and a load.
The other options are incorrect because:
- Two full converters connected in parallel would not inherently provide bidirectional power flow capability in all four quadrants.
- Two semi-converters connected in back to back would not allow full control in all four quadrants as semi-converters only operate in two quadrants.
- Two full converters in series also wouldn’t inherently provide bidirectional power flow capability in all four quadrants, as the series connection limits the direction of power flow.