The Improved Unified Power Quality Conditioner with the Modular Multilevel Converter for Power Quality Improvement

Table 1

Arm current and conducting states of the submodule.

Arm current status	Conducting switch	Change in voltage	Device on state	Switch states	Sub-module voltage
I arm > 0	S 1 or D2		S 1; D 2	S 1 = On; S2 = Off	V c
I arm < 0	S 2 or D1		D1; S2	S 1 = Off; S2 = On	0