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IS 16301:2016 is the Indian Standard (BIS) for grid interconnection of photovoltaic (pv) systems. This standard specifies the technical, safety, and power quality requirements for interconnecting solar photovoltaic (PV) power systems with the electrical distribution grid. It provides criteria for voltage, frequency, protection schemes like anti-islanding, and harmonic limits to ensure the safe, reliable, and stable operation of the grid with integrated PV generation.
Specifies general requirements for the safe and reliable grid interconnection of photovoltaic (PV) systems, including protection and operational aspects.
BIM-relevant code. See the BIM Hub for ISO 19650, IFC, and LOD/LOIN frameworks used alongside it.
Practical Notes
! Anti-islanding protection is a critical safety feature; its functionality must be tested and verified during commissioning as per Clause 8.
! Ensure the selected grid-tie inverter has a valid type test certificate conforming to IS 16221 and other relevant standards mentioned herein.
! Always consult the local electricity distribution company (DISCOM) for their specific interconnection requirements, which may be in addition to this standard.
Photovoltaic (PV) systems - Characteristics of the utility interface
Defines requirements for the interface of PV systems with the public utility grid.
IEEE 1547-2018IEEE (US)
HighCurrent
Standard for Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces
Covers all distributed energy resources (DER), including PV, focusing on grid support and interoperability.
VDE-AR-N 4105:2018-11VDE (Germany)
HighCurrent
Power generation systems connected to the low-voltage distribution network - Technical minimum requirements for the connection to and parallel operation with low-voltage distribution networks
Specifies technical requirements for connecting generation systems to the German LV grid; highly influential in Europe.
IEC 62116:2014IEC (International)
MediumCurrent
Test procedure of islanding prevention measures for utility-interconnected photovoltaic inverters
Focuses specifically on the test procedures for anti-islanding, a key component of IS 16301.
Key Differences
≠IS 16301 defines specific voltage and frequency 'trip' windows, whereas modern standards like IEEE 1547-2018 emphasize mandatory voltage and frequency 'ride-through' capabilities to help stabilize the grid during disturbances rather than disconnecting.
≠IEEE 1547-2018 mandates a comprehensive suite of 'smart inverter' grid support functions (e.g., Volt-Var, Frequency-Watt, Volt-Watt). IS 16301 mentions power factor control but generally defers advanced function requirements to the local utility, making them optional rather than a baseline requirement.
≠IS 16301 specifies harmonic limits using Total Harmonic Distortion (THD). In contrast, IEEE 1547 references IEEE 519, which uses Total Demand Distortion (TDD). TDD is normalized to the maximum demand load current, not the fundamental current at the moment of measurement, providing a different perspective on the system's impact.
≠The re-connection requirements in IS 16301 are simpler, typically a fixed time delay (e.g., 3 minutes) after grid parameters return to normal. IEEE 1547-2018 includes more sophisticated 'soft start' and ramp-rate limits upon reconnection to minimize grid impact.
Key Similarities
≈Both IS 16301 and its international equivalents mandate robust anti-islanding protection, requiring the PV system to detect grid loss and cease to energize the local grid within a very short timeframe (typically <2 seconds).
≈All standards strictly limit the injection of DC current into the AC grid to prevent transformer saturation and metering errors. The typical limit in both Indian and international standards is less than 0.5% of the inverter's rated output current.
≈The fundamental requirement to limit harmonic current injection to maintain power quality on the grid is a core principle in IS 16301 and all its counterparts, even though measurement methodologies may differ. The goal is to prevent distortion of the grid's sine wave.
≈All standards define a 'normal' operating range for grid voltage and frequency. While the exact values and ride-through/trip behaviors may differ, the concept of operating continuously within a specified range and taking protective action outside of it is universal.
Parameter Comparison
Parameter
IS Value
International
Source
Anti-Islanding Disconnection Time
Within 2 seconds
Within 2 seconds
IEC 61727:2004
DC Current Injection Limit
≤ 0.5% of rated output current
≤ 0.5% of rated output current
IEC 61727:2004
Total Harmonic Distortion (Current)
< 5%
< 5% (TDD for Isc/IL < 20)
IEEE 1547-2018 (ref. IEEE 519)
Operating Frequency Range (Continuous)
47.5 Hz – 52.0 Hz (as per CEA Grid Code)
47.0 Hz – 52.0 Hz (for long time deviations)
VDE-AR-N 4105:2018-11
Disconnection Time for Overvoltage (>120% V_nom)
< 0.1 seconds
≤ 0.16 seconds
IEEE 1547-2018
Disconnection Time for Undervoltage (<50% V_nom)
< 0.1 seconds
≤ 0.16 seconds
IEEE 1547-2018
Power Factor Capability
> 0.9 lagging (or as specified by utility)
Capable of adjustable 0.85 lagging to 0.85 leading
IEEE 1547-2018
Reconnection Time After Grid Fault
3 minutes (fixed delay)
Adjustable from 0 to 300 seconds (default 300s)
IEEE 1547-2018
⚠ Verify details from original standards before use
Key Values6
Quick Reference Values
Nominal grid frequency50 Hz
Continuous frequency operating range47.5 Hz to 52.0 Hz
Anti-islanding detection time limit< 2 seconds
Total Harmonic Current Distortion (THDi) limit< 5%
Power factor requirement at full output> 0.9 lagging
DC injection limit< 0.5% of inverter's rated output current
Tables & Referenced Sections
Key Tables
Table 1 - Under/Over Voltage and Frequency Trip Times for LV Connected PV Systems
To define the requirements for connecting PV systems to the electricity grid, ensuring the safety of personnel, stability of the grid, and quality of power.
What is anti-islanding protection?+
It's a safety feature that disconnects the PV system from the grid during a power outage to prevent it from energizing a dead line. The system must disconnect within 2 seconds (Clause 6.3).
What are the permissible frequency limits for a grid-tied inverter?+
The system must operate continuously between 47.5 Hz and 52.0 Hz and disconnect outside this range according to trip times specified in Table 1.
Does this standard apply to off-grid solar systems?+
No, this standard is specifically for grid-interconnected (grid-tied) PV systems.