VAr Dispatch interfaces

This topic describes the interfaces RPOs can use to receive instructions.

RPOs can choose any of the interface methods below to receive VAr Volt-Ampere reactive power, relating to voltage control in the power system Dispatch See National Electricity Rules electronic instructions and are responsible for their own interfacing costs:

• The VAr Dispatch web interface in the EMMS Web Portal is a low cost option needing only a web browser with MarketNet access, see VAr Dispatch Markets Portal Interface. The web interface is one way; participants cannot use it to inform AEMO of device unavailability, see Reactive device availability.
• Data Interchange (DI) is a low cost option providing a file, similar to the MW instructions currently received by many participants. AEMO expects most generators will use DI software to receive VAr Dispatch instructions, see Data Interchange Interface The DI interface is one way; participants cannot use it to inform AEMO of device unavailability, see Reactive device availability.
• ControlNet is typically used between AEMO and TNSPs. Some generators are connected to ControlNet but electronic instructions are sent directly to the TNSP, not the generator. Be aware that some TNSPs impose a service charge on generator's RPOs seeking a SCADA option. Setting up and using SCADA is out of scope for this guide, for SCADA requirements, see ControlNet (SCADA) Interface.

Figure 177 VAr Dispatch interface options