Interconnection Technical Specifications & Requirements
General Requirements (IEEE 1547 / CEA Regulation 2013)
Voltage Regulations: The distributed resources shall not actively regulate the voltage at the point of interconnection.
Synchronization: The distributed resource synchronized with electric system shall not cause a voltage fluctuation at the point of interconnection greater than ±5%.
Monitoring Provision: Each distributed resource of 250 kVA or more at a single point of interconnection shall have provisions for monitoring its connections status, real power output, reactive power output and voltages at the point of interconnection.
Isolation Device: There should be a manually operating isolating switch between distributed generation resource and electric system, which meets the following requirements:
- Allow visible verification that separation has been established
- Indicators to show clearly closed and open position
- Be readily accessible and be capable of being locked in open position
- May not be rated for load-break
- Be located at height of 2.44 m above ground level
| Parameters | Reference | Requirement |
| Overall Grid Standards | Central Electricity Authority (Grid Standard) regulations 2010 | Compliance |
| Equipment | BIS / IEEE / IEC | Compliance |
| Meters | Central Electricity Authority (Installation and Operation of Meters) Regulation 2006& Amendments thereof, OERC Generic Tariff Order 2013 | Compliance |
| Safety and Supply | Central Electricity Authority (Measures of Safety and Electricity Supply) Regulation 2010 | Compliance |
| Harmonic Current | IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013 | shall not exceed the limits specified in IEEE 519 |
| Synchronization | IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013 | Every time the generating station must be synchronized to the grid. Voltage fluctuation < ± 5% at point of inter connection |
| Voltage | IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013 | Voltage-operating window should be under operating range of 80% to 110% of the nominal connected voltage. Beyond a clearing time of 2 second, the photovoltaic system must isolate itself from the grid |
| Flicker | IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013 | Should not cause voltage flicker in excess of the limits stated in IEC 61000 |
| Frequency | IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013 | When the Distribution system frequency deviates outside the specified conditions (50.5 Hz on upper side and 47.5 Hz on lower side), there should be over and under frequency trip functions with a clearing time of 0.2 seconds. |
| DC injection | IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013 | Should not inject DC power more than 0.5% of full rated output at the interconnection point |
| Power Factor | IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013 | While the output of the inverter is greater than 50%, a lagging power factor of greater than 0.9 should operate |
| Islanding and Disconnection | IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013 | In the event of fault, voltage or frequency variations the PV system must island / disconnect itself within IEC standard on stipulated period |
| Overload and Overheat | IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013 | The inverter should have the facility to automatically switch off in case of overload or overheating and should restart when normal conditions are restored |
| Paralleling Device | IEEE 519 and CEA (Technical Standards for Connectivity of the Distributed Generation Resources) Regulations 2013 | Paralleling device of photovoltaic system shall be capable of withstanding 220% of the normal voltage at the interconnection point. |