![ANTI-ISLANDING GRID
STANDARDS
IEEE 1547-2003: 4.4.1-For an unintentional island in
which the DR energizes a portion of the Area EPS through
the PCC, the DR interconnection system shall detect the
island and cease to energize the Area EPS within two
seconds of the formation of an island. [1]
The IEEE Std. 1547 and UL 1741 provide thresholds on
the amount of acceptable voltage and frequency deviation.
Thresholds on voltage deviations are in the range of 88% to
110% of the nominal voltage value [2].
3/31/20173](https://image.slidesharecdn.com/seminarpre-170331100307/85/anti-islanding-technology-passive-3-320.jpg)
![ANTI-ISLANDING TECHNIQUES
3/31/20174 source-[4]
FIG:1](https://image.slidesharecdn.com/seminarpre-170331100307/85/anti-islanding-technology-passive-4-320.jpg)
![PASSIVE ANTI ISLANDING DETECTION
• Active power is directly proportional to the
voltage.
• When PDG > Pload there is an increase of the
amplitude of the voltage
• if PDG < Pload there is a decrease of the
amplitude of voltage
Pload =PDG+∆P
Qload = QDG +∆Q
3/31/20176
Source-[5]
FIG-2
OVER-UNDER VOLTAGE DETECTION
METHOD](https://image.slidesharecdn.com/seminarpre-170331100307/85/anti-islanding-technology-passive-6-320.jpg)
![REFERENCE
[1] IEEE Std 1547-2003, Standard for Interconnecting
Distributed Resources with Electric Power Systems,
IEEE, 2003.
[2] Static inverter and charge controllers for use in
photovoltaic systems , UL 1741, Underwriters
Laboratories, Inc., 2001, Std. UL . stems
[3] Francesco De Mango', Marco Liserre, Antonio
Dell'Aquila and Alberto Pigazo Overview of Anti-
Islanding Algorithms for PV Systems. Part I: Passive
Methods. 2006 IEEE.
[4] K. O. Samaroo, “Methodology of Selection, Setting
and Analysis ofAnti-Islanding Protection for
Distribution Generation System,”University Of
Guyana, Department of Electrical Engineering, 2012.
3/31/201716](https://image.slidesharecdn.com/seminarpre-170331100307/85/anti-islanding-technology-passive-16-320.jpg)
![3/31/201717
[5] M. Hanif, M. Basu ,K.Gaughan ‘A Discussion
of Anti-islanding Protection Schemes
Incorporated in a Inverter Based DG’ 2011 IEEE](https://image.slidesharecdn.com/seminarpre-170331100307/85/anti-islanding-technology-passive-17-320.jpg)
anti islanding technology(passive)
- 1. 3/31/20171 ELECTRICAL AND ELECTRONICS DEPARTMENT AMRITA SCHOOL OF ENGINEERING, ETTIMADAI PRESENTED BY: MINU YACOB-RET16010 Anti-islanding Detection for Grid Connected Solar Photovoltaic system GUIDED BY, Dr A VIJAYAKUMARI
- 2. ISLANDING The continued operation of a Distributed generator (DG) even when the electric utility is absent, - Unintentional islanding - Intentional islanding Effect of Islanding - hazard for utility line-workers. - DG being a limited capacity source – entire utility load come on it - The DG protection will be triggered - Reclosing into an island may result in damaging the DG equipment, because of out of-phase closure. 3/31/20172
- 3. ANTI-ISLANDING GRID STANDARDS IEEE 1547-2003: 4.4.1-For an unintentional island in which the DR energizes a portion of the Area EPS through the PCC, the DR interconnection system shall detect the island and cease to energize the Area EPS within two seconds of the formation of an island. [1] The IEEE Std. 1547 and UL 1741 provide thresholds on the amount of acceptable voltage and frequency deviation. Thresholds on voltage deviations are in the range of 88% to 110% of the nominal voltage value [2]. 3/31/20173
- 5. 3/31/20175 COMPARISON OF ANTI-ISLANDING TECHNIQUES • DETECTION TIME • PARAMETERS TO BE MONITORED • NON DETECTION ZONE The NDZ is the range of local loads for which the islanding prevention method can be made to fail to detect islanding. When the utility disconnects, if Pload =PDG, change in the amplitude or frequency of voltage will be insufficient to activate any of the standard over/under voltage or frequency protection devices.
- 6. PASSIVE ANTI ISLANDING DETECTION • Active power is directly proportional to the voltage. • When PDG > Pload there is an increase of the amplitude of the voltage • if PDG < Pload there is a decrease of the amplitude of voltage Pload =PDG+∆P Qload = QDG +∆Q 3/31/20176 Source-[5] FIG-2 OVER-UNDER VOLTAGE DETECTION METHOD
- 7. 3/31/20177 IMPLEMENTATION OF OVER-UNDER VOLTAGE DETECTION METHOD
- 8. CASE 1- 5kW Load(PDG>Pload) 3/31/20178 Power rating of pv system-59.5 kW Power rating of the load-5kW Circuit Breaker opening time-.6s to .8s
- 9. CASE 1- ACTIVE POWER FLOW 3/31/20179
- 10. VOLTAGE AND CURRENT AT PCC 3/31/201710
- 11. Case 2-120kW LOAD(PDG<Pload) 3/31/201711 Power rating of pv system-59.5 kW Power rating of the load-120kW Circuit Breaker opening time-.6s to .8s
- 12. CASE 2-ACTIVE POWER FLOW 3/31/201712
- 13. Case 2– VOLTAGE AND CURRENT AT PCC 3/31/201713
- 14. 59.2 kW LOAD – VOLTAGE AND CURRENT AT PCC 3/31/201714
- 15. CONCLUSION 3/31/201715 OV/UV passive islanding detection method failed to detect islanding when the Pload matches the PDG. The chances of detection of islanding using OV method is less compared to UV because the change in voltage during islanding is less.
- 16. REFERENCE [1] IEEE Std 1547-2003, Standard for Interconnecting Distributed Resources with Electric Power Systems, IEEE, 2003. [2] Static inverter and charge controllers for use in photovoltaic systems , UL 1741, Underwriters Laboratories, Inc., 2001, Std. UL . stems [3] Francesco De Mango', Marco Liserre, Antonio Dell'Aquila and Alberto Pigazo Overview of Anti- Islanding Algorithms for PV Systems. Part I: Passive Methods. 2006 IEEE. [4] K. O. Samaroo, “Methodology of Selection, Setting and Analysis ofAnti-Islanding Protection for Distribution Generation System,”University Of Guyana, Department of Electrical Engineering, 2012. 3/31/201716
- 17. 3/31/201717 [5] M. Hanif, M. Basu ,K.Gaughan ‘A Discussion of Anti-islanding Protection Schemes Incorporated in a Inverter Based DG’ 2011 IEEE