A Review of Control Techniques and Energy Storage for Inverter-Based Dynamic Voltage Restorer in Grid-Integrated Renewable Sources

Table 1

Voltage ride-through standards in different countries.

Parameters	Country	Regulation
		During fault		After fault
		t max. (s)	V min. (%)	t max. (s)	V max. (%)
LVRT	UK	0.14	15	1.2	80
	Denmark	0.5	20	1.5	90
	US (NERC)	0.625	15	3.0	90
	China	0.625	20	2.0	90
	Japan	1.0	20	1.2	80
	US (PREPA)	0.60	15	3.0	85
	Romania	0.625	15	3.0	90
ZVRT	Canada	0.15	0	1.0	85
	Germany	0.15	0	1.5	90
	Australia	0.45	0	0.45	80
	US (WECC)	0.15	0	1.75	90
	Spain	0.15	0	1.0	85
	Malaysia	0.15	0	1.5	90
	Italy	0.2	0	1.5	85
	South Africa	0.15	0	2.0	85
		During fault (caused voltage increase)
		t max. (s)		V min. (%)
HVRT	Denmark	0.1		120
	Germany	0.1		120
	Spain	0.25		130
	US (NERC)	1.0		120
	US (WECC)	1.0		120
	US (PREPA)	1.0		140
	South Africa	0.15		120
	Malaysia	Continuous		120
	Australia	0.06		130
	Italy	0.1		125
	Romania, China, Canada, and the UK	Not defined		Not defined