[Retracted] Optimization of Voltage Dynamic Performance at Inverter Output with Machine Learning and Intelligent Virtual Impedance

Table 3

Some development history of DVR.

Year	Capacity class	Country of development	Number of inverter levels	Series transformer
1999	12.47 kV	United States	2	Yes
	2 MVA
2001	10 KVA	UK	2	Yes
	100 V
2002	250 KVA	Netherlands	Multilevel	None
	220 V
2003	220 V	Taiwan	2	Yes
2004	1 KVA	Singapore	2	None
	200 V
2005	200 KVA	Denmark	2	Yes
	10 KV	Australia
2006	50 V	United States	Multilevel	Yes
2007	10 KV	Canada	2	Yes
		Singapore
		Denmark
2008	5 KVA	China	Multilevel	None
	110 V