AS/NZS 4777.2:2015


Grid connection of energy systems via inverters, Part 2: Inverter requirements

Specifies requirements and tests for low voltage inverters for the injection of electric power through an electrical installation into the grid at low voltage. This Standard applies to inverters that have power flow in either direction between the energy source and the grid. General requirements relating to the test methods set out in Appendices B to J are specified in Appendix A.
Published: 09/10/2015
Pages: 71
Table of contents
Cited references
Content history
Table of contents
About this publication
1 Scope
2 Application
3 Normative references
4 Definitions
5 General requirements
5.1 Electrical safety
5.2 Provision for external connections
5.3 Photovoltaic (PV) array earth fault/earth leakage detection
5.4 Compatibility with electrical installation
5.5 Power factor
5.6 Harmonic currents
5.7 Voltage fluctuations and flicker
5.8 Transient voltage limits
5.9 D.C. current injection
5.10 Current balance for three-phase inverters
6 Operational modes and multiple mode inverters
6.1 General
6.2 Inverter demand response modes (DRMs)
6.2.1 General
6.2.2 Interaction with demand response enabling device (DRED)
6.3 Inverter power quality response modes
6.3.1 General
6.3.2 Volt response modes General Volt–watt response mode Volt–var response mode Voltage balance modes
6.3.3 Fixed power factor mode and reactive power mode
6.3.4 Characteristic power factor curve for cos φ (P) (Power response)
6.3.5 Power rate limit General Gradient of power rate limit Power rate limit modes General Soft ramp up after connect or reconnect Changes in a.c. operation and control Changes in energy source operation Nonlinearity of power rate limit changes
6.4 Multiple mode inverter operation
6.4.1 General
6.4.2 Sinusoidal output in stand-alone mode
6.4.3 Volt–watt response mode for charging of energy storage
6.5 Security of operational settings
7 Protective functions for connection to electrical installations and the grid
7.1 General
7.2 Automatic disconnection device
7.3 Active anti-islanding protection
7.4 Voltage and frequency limits (passive anti-islanding protection)
7.5 Limits for sustained operation
7.5.1 General
7.5.2 Sustained operation for voltage variations
7.5.3 Sustained operation for frequency variations Response to an increase in frequency Response to a decrease in grid frequency
7.6 Disconnection on external signal
7.7 Connection and reconnection procedure
7.8 Security of protection settings
8 Multiple inverter combinations
8.1 General
8.2 Inverter current balance across multiple phases
8.3 Grid disconnection
8.4 Grid connection and reconnection
8.5 Testing combinations
8.5.1 Single-phase combinations
8.5.2 Single-phase inverters used in three-phase combinations
8.5.3 Required tests for multiple inverter combinations
8.5.4 Multiple inverters with one automatic disconnection device
9 Inverter marking and documentation
9.1 General
9.2 Marking
9.2.1 General
9.2.2 Equipment ratings
9.2.3 Ports
9.2.4 External and ancillary equipment
9.2.5 Residual current devices (RCDs)
9.2.6 Demand response modes
9.3 Documentation
9.3.1 General
9.3.2 Equipment ratings
9.3.3 Ports
9.3.4 External and ancillary equipment
9.3.5 RCDs
9.3.6 Multiple mode inverters
9.3.7 Multiple inverter combinations
Appendix A
A1 General
A2 Test conditions
A3 Inverter set-up
A4 Grid source
A5 Reference network impedance
Appendix B
B1 Test procedure
B2 Power factor limits
B3 Test report
Appendix C
C1 Test procedure
C2 Harmonic current limits
C3 Grid source during harmonic test
C4 Test report
Appendix D
D1 General
D2 Test procedure
D3 Transient voltage limits
D4 Test report
Appendix E
E1 General
E2 Test procedure
E3 D.C. Current limits
E4 Test report
Appendix F
F1 General
F2 Load conditions
F2.1 General
F2.2 Load condition A
F2.3 Load conditions B and C
F2.3.1 General
F2.3.2 Resonant load
F3 Test under load condition A
F4 Test under load condition B
F5 Test under load condition C
F6 Disconnection requirements
F7 Test report
Appendix G
G1 General
G2 Undervoltage and overvoltage trip settings and reconnection test
G2.1 General
G2.2 Test procedure
G2.3 Criteria for acceptance
G3 Under-frequency and over-frequency trip settings and reconnection test
G3.1 General
G3.2 Test procedure
G3.3 Criteria for acceptance
Appendix H
H1 General
H2 Sustained operation for voltage variations
H2.1 General
H2.2 Test procedure
H2.3 Criteria for acceptance
H2.4 Test report
H3 Sustained operation for frequency variations
H3.1 General
H3.2 Test procedure
H3.3 Criteria for acceptance
H3.4 Test procedure for inverters with energy storage
H3.5 Test procedure
H3.6 Criteria for acceptance
H3.7 Test report
Appendix I
I1 General
I2 Test procedures
I2.1 Test for demand response and disconnection on external signal
I2.2 Test for disconnection at rated current output
I2.3 Test for standard operation of generator demand response modes
I2.4 Test for standard operation of load demand response modes (such as for battery charging)
I3 Demand response mode limits
I4 Test report
Appendix J
J1 General
J2 Test procedures
J2.1 Test for single-phase combinations
J2.2 Test for single-phase inverters used in three-phase combination
J2.2.1 Test procedure
J3 Test report
Appendix K
Cited references in this standard
IEC 61000.3.3
Electromagnetic compatibility (EMC), Part 3.3: Limits—Limitation of voltage changes, voltage fluctuations and flicker in public low-voltage supply systems, for equipment with rated current ≤ 16 A per phase and not subject to conditional connection
Installation and safety requirements for photovoltaic (PV) arrays
[Available Superseded]
Standard voltages
Uninterruptible power systems (UPS), Part 1.1: General and safety requirements for UPS used in operator access areas
Electrical installations (known as the Australian/New Zealand Wiring Rules)
Content history
[Available Superseded]
[Available Superseded]
DR AS/NZS 4777.2:2015
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