Within the scope of AS/NZS 4777.2:2015 are varies demand response as well as active/passive inverter setting. Demand response mode (DRM0) and Volt-Watt are currently the only mandatory requirements. What these basically offer is that if required a 3rd party can turn off a system via the DRM0 action, or if the grid voltage is in excess of 250Vac then the inverter within the system will curtail is export. As long as the energy storage system has an inverter which is classified as a ‘multi-mode inverter’ then the charge action up to 262Vac does not need to curtail at all.
What we are now experiencing however is a lot of the DNSP’s going it alone and asking for the non-mandatory response modes to become activated such as Volt-Var or fixed Power Factor. But what does this mean for A the industry and B the consumer and C the network?
From the industries perspective there are various issues, namely with the labour involved to implement these settings. If a manufacturer was to simply enable these settings across the board to all AU/NZ products, then they would breach AS/NZS 4777.2:2015 and risk being de-listed by the CEC. The only solution is a setting to be changed by the installer on every installation behind a secure password protected element of the product, assuming this function has been pre-setup within the system firmware, in some cases this is not an option as it simply does not need to be.
For the consumer it means that they are now supporting the network and not only limiting the systems performance but supplying or absorbing power to help balance the grid, without being compensated for it.
For the DNSP it’s great…. They get assets they don’t own and that they have not paid for to support the grid without it costing them anything in the process.
The situation seems incredibly unfair, if the DNSP’s are benefitting from these expensive assets and influencing the consumers payback on their systems then they should be financially contributing to the process.