A Nonlinear Controller for Neutral Point Piloted (T-Type) Multilevel Inverter-Based Three-Phase Four-Wire DSTATCOM

Table 1

Switching sequence of 3L-NPP.

Generation of level	Switching state	S1a	Sa'	Sa''	S2a	Output voltage
+Vdc/2	P	On	Off	On	Off	+1
0	O	Off	On	On	Off	0
−Vdc/2	N	Off	On	Off	On	‒1