HPC-9DJ-13-0002-2019 - Horizon Power Low Voltage EG Connection Technical Requirements.pdf
HPC-9DJ-13-0001-2019 - Horizon Power Basic Micro EG Connection Technical Requirements.pdf
June 2021 update:
From 1 July 2021, inverter systems in Western Australia must be compliant with new voltage disturbance requirements
From 18 December 2021 all inverters connecting to Horizon Power’s systems must be in accordance with AS/NZS 4777.2:2020 with the default regional setting selection set to “Australia C”. In order to keep power systems stable under high penetration of distributed energy resources, the new Australian Standard AS/NZS 4777.2:2020 now prescribes mandatory requirement for all inverters to have Voltage Disturbance Ride-Through (VDRT) capability.
Changes from 1 July, 2021
From 1 July 2021, all inverters in WA that meet the previous version of AS/NZS 4777.2:2015 are required to have this VDRT capability. This implementation requirement is being accelerated in WA at the recommendation of the Energy Transformation Taskforce to reduce the number of inverters with lower specifications being installed prior to December 2021.
Therefore inverter based systems installed in WA between 1 July 2021 and 18 December 2021, which are registered under the outgoing AS/NZS 4777.2:2015 standard, will now be required to comply with the Short Duration Under Voltage Disturbance ride-through test procedure published by AEMO.
In determining approval for connection, inverters that meet the 2015 version of AS 4777.2 will be required to demonstrate compliance with the new voltage disturbance ride-through test protocol that was developed by the Australian Energy Market Operator. Horizon Power will be using a list of inverters compliant with the new test protocol as provided by the Clean Energy Council (CEC).
In order to allow time for projects already under consideration, applications which have been submitted to and approved by Horizon Power prior to 1 July 2021 under the old requirements will be permitted a one month grace period for physical installation and submission of all completion notices.
Watch the information session
To avoid confusion and ensure alignment across Western Australia, Horizon Power recently provided joint commentary at an industry information session hosted by Western Power and Energy Policy WA on Thursday 27 May 2021. Further explanation via a recording of that event can be found on the Western Power website.
For further enquiries, please email [email protected]
October 2019 update:
Horizon Power has recently updated its Technical Requirements with updated inverter settings, to ensure inverters do not curtail unnecessarily due to frequency fluctuations.
The settings are the Over-Frequency Power Reduction settings, as described in Clause 184.108.40.206 of AS/NZS 4777.2, including:
- Activation Frequency – this is the frequency level at which over-frequency power reduction is activated.
- Deactivation Frequency – this is the frequency level below which the over-frequency power reduction is deactivated (after a suitable delay – see the Deactivation Time) and the power level may be increased in accordance with the power rate limit.
- Deactivation Time – this is the period of time for which frequency must be below the Deactivation Frequency before the over-frequency power reduction is deactivated and the power level may be increased in accordance with the power rate limit.
- Fstop – this is the point on the Over-Frequency Power Reduction curve where the output of the system reaches zero.
The following settings are now required for the Over-Frequency Power Reduction settings, in non-standard network areas (i.e. outside the NWIS):
- Activation Frequency: 50.6 Hz
- Deactivation Frequency: 50.5 Hz
- Deactivation Time: 20 sec
- Fstop: 53.0 Hz
For systems with energy storage, the following settings are also required for Under-Frequency Charge Rate Limits (refer AS/NZS 4777.2 Clause 220.127.116.11), in non-standard network areas (i.e. outside the NWIS)::
- Under-Frequency Activation Frequency: 49.4 Hz
- Under-Frequency Deactivation Frequency: 49.5 Hz
- Under-Frequency Deactivation Time: 20 sec
- Fstop-CH: 45.0 Hz
Settings for standard network areas (i.e. NWIS) shall be as per Section 7.5.3 of AS/NZS 4777.2.
Proponents are required to ensure that all new systems installed comply with the new settings. The Technical Requirements documents above have been updated with the new settings.