ElectraNet's ESCRI-SA grid connected 30 MW / 8 MWh Battery Energy Storage System (BESS) is located seven kilometres south-east of Stansbury in South Australia adjacent to ElectraNet's existing Dalrymple substation and will demonstrate how energy storage can strengthen the grid and improve reliability for the lower Yorke Peninsula. Construction was awarded to Consolidated Power Projects, an Adelaide company, who are working with international power company ABB and battery provider Samsung. For more information see the IDTechEx report on Batteries for Residential, Commercial, Industrial and Utility Applications.
The ESCRI-SA BESS consists of Samsung lithium ion rechargeable batteries integrated via ABB invertors, controller and transformers. The maximum design charge / discharge rate of the BESS is 30 MW and the design capacity of the BESS is 8 MWh at the end of the 12 year design life. The initial installed capacity of the battery is higher to allow for battery deterioration over the BESS design life.
The sizing of the battery capacity has been optimised to be able to provide the following range of primary services:
- Supply of Fast Frequency Response (FFR) to reduce constraints on the Heywood interconnector, resulting in increased flows on the interconnector;
- Reduction of expected unserved energy to Dalrymple following loss of supply, involving islanding of the BESS with the local load, the Wattle Point Wind Farm intended to remain in service at reduced output, and local rooftop PV, until grid supply is restored;
- Market trading of electricity in the National Electricity Market through the provision of market caps (a market derivative/ insurance product) and Frequency Control Ancillary Services (FCAS) services.
The BESS has been built with two identical rows of lithium ion rechargeable batteries coupled to two series of invertors that convert the DC power to AC power. The invertors supply power via six low voltage to 33 kV transformer and are connected via the BESS control room to an underground cable to Dalrymple substation. The batteries are charged from and discharged via this underground cable.
The BESS has two levels of controls. The first level of control is automated and responds to system events is controlled by preprogramed logic. The second level of control for market trading and charging is controlled by AGL. The first level of control take precedence over the second level.
Following commissioning, ElectraNet will lease the BESS to AGL who will operate it to provide competitive market services. The project is part funded by the Australian Renewable Energy Agency (ARENA).
ARENA chief executive Ivor Frischknecht said the Dalrymple battery would be one of the largest ever built, and the first in Australia backed by mostly private investment from the energy industry. "It may not be the biggest battery in the world, but pound-for-pound it will pack a big punch in demonstrating how utility scale storage can contribute to a stronger South Australian energy network. Australia is now a leader in demonstrating the potential of large-scale battery technology to facilitate high levels of renewable energy penetration" Mr Frischknecht said.
ElectraNet, CPP and ABB formal commissioning and testing of the Dalrymple battery is in progress and was expected to be completed by end of September 2018. Although the battery has not quite completed its commissioning, it is already showing some interesting innovations.
At the end of September , it went into "islanding" mode - taking a large part of the Yorke Peninsula off the grid and using the battery to supply the local consumers. It appears to have gone well and is expected to come into service "very soon", according to ElectraNet.
Source and top image: ElectraNet
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