Smart solar control and monitoring for a zero cost energy future: phase 1

Challenge

SA Water delivers clean water, removes and treats wastewater, and recycles wastewater for more than 1.7 million customers across South Australia.

Driven by energy market uncertainty, and in order to achieve low and stable prices for its customers, SA Water committed to achieving sustainability through launching its Zero Cost Energy Future project in 2018.

The project strategy intends to minimise the business’ total electricity costs while taking acceptable market risks with the overall goal to neutralise electricity operating costs.

SA Water sought to achieve this goal through a number of initiatives including the introduction of behind the meter generation and storage capability across multiple sites.

In order to fulfil the technical challenge and meet the ambitious schedule, SA Water needed to engage both a solar installation expert and a specialised partner to deliver the control and monitoring systems essential for effective energy management at their sites. EPC contractor Enerven partnered with control system and automation integrator SAGE Automation to deliver the solution.

Solution

Working with Enerven, SAGE supplied the operational control and monitoring systems for the generation and storage assets.

The project will be delivered as two phases, allowing the team to clearly identify the project risk and opportunity before launching into the full deployment of the solution.

During the first phase of the project, 4.2MW of solar photovoltaic (PV) generation capacity was installed across three of SA Water’s power-hungry, high-energy treatment facilities: Hope Valley Water Treatment Plant (WTP), Christies Beach Wastewater Treatment Plant (WWTP), and Glenelg WWTP.

Phase 2 of the project will deploy nearly 370,000 solar panels and it includes thermal storage infrastructure at 33 sites across South Australia.

4.2MW of solar photovoltaic (PV) generation capacity installed across three SA Water sites in Adelaide

Smart control and monitoring in cutting-edge application of solar ‘behind the meter’

As part of the first phase of works, SAGE carried out extensive design and engineering of the Power Plant Controller (PPC) and SCADA integration, before testing and installing approximately 150 solar inverters. Containerised ‘switch rooms’ were designed and manufactured to house the solar inverters, power distribution switchboard, and the EMS. The containers were transported and installed on site.

Large scale behind the metre energy generation systems require a power plant controller (PPC)

End-to-end delivery of a custom power plant controller

SAGE designed and engineered the control and monitoring systems as part of the first phase of the project.

Design work included:

• LV AC electrical
• Power Plant Controller (PPC)
• PPC Network, including DNSP RTU, protection, metering and inverter interfaces
• SCADA
• LV Switchboard
• String inverter 40ft container.

Power Plant Controller (PPC)
The PPC is a bespoke control system that autonomously manages energy generation, conversion and allocation for solar and grid-derived energy while balancing this against operational electricity requirements in real-time.

The system allows for remote monitoring and control via smart device.

SAGE developed a custom control system to autonomously manage energy generation

Testing, commissioning and installation
SAGE carried out detailed testing as part of the installation process, including:

• FAT and SAT Testing
• Commissioning
• DNSP testing.

SCADA integration
Large scale behind the meter energy generation system requires a PPC with a SCADA interface that can be accessed, controlled and monitored by governing power authority's system and the company's SCADA. SAGE integrated these systems, with care to plan for future onsite storage infrastructure.

Time-lapse video of the solar PV control system build