Transmission & Distribution Technology
A second innovation is that the 380 kV transmission grid includes long sections of underground cables; around the world, such grids are almost entirely above ground. By using underground cables, TenneT says it demonstrates a commitment to furthering the development of this new technology. Te Randstad380 South Ring includes a total of 10.7km underground, sparing a densely populated area the significantly greater impact of overhead lines and pylons. Te underground installation of a high-capacity 380kV cable over such a long distance is a world first, which makes the Netherlands a leader in the construction of innovative high-voltage connections, says TenneT. In Canadian news, Bechtel has completed the
Hanna Region Transmission Development (HRTD) project on schedule and under budget. Te project to expand and upgrade ATCO Electric’s electrical transmission system and infrastructure in Alberta included stringing 353 km of 240 kV and 144 kV transmission lines, constructing more than 1200 new transmission towers, and building six new substations and upgrading 12 substations. “Te construction of the HRTD project has helped us meet the increased demand for electricity in the Hanna region due to industrial growth in the area,” said Sett Policicchio, president, ATCO Electric Transmission Division. “We were pleased to work with a team that could skilfully manage construction in environmentally sensitive areas and cope with our diverse weather conditions.” About 60 per cent of the area where the transmission line was built passed through protected pasture, native grasses, and wetlands that are also popular wildlife breeding grounds. To minimise the impact, the project team used a mobile app to ensure that the field team had customised information about accessing land parcels and environmental regulations. “Te complexity of this project was in the logistics of constructing a variety of transmission-line
segments over a vast geographic area, with varying site conditions,” said Toby Seay, president of Bechtel’s transmission business line. “Despite working miles apart, the Bechtel and ATCO Electric team worked in unison to develop innovative and sustainable solutions that ensured the safe delivery of the project with minimal environmental impact,” he added. Te company is now supporting ATCO Electric’s Eastern Alberta transmission line project. Bechtel will construct approximately 485 km of 500 kV high voltage direct current transmission line running from the Gibbons-Redwater area northeast of Edmonton to the Brooks area southeast of Calgary.
Offshore converter In a separate development, ABB has installed the world’s highest-voltage offshore converter station in the North Sea (Fig. 1). Alternating current electricity generated in three wind farms off the coast of Germany will be converted on the platform into high-voltage direct current (HVDC) for transmission to the mainland.
Te 320kV converter station has an 800MW power transmission capacity making it the world’s most powerful installation of its kind. In a three-day operation, the 9300 tonne topside including the converter station was transported offshore by barge around 75km off the German coast. It was then lifted by the world’s largest crane vessel Tialf and positioned on top of the already installed jacket. “Putting such a huge platform in place is one of the most delicate operations in the delivery of an offshore transmission link, requiring strong cooperation between the many stakeholders involved,” said Brice Koch, head of ABB’s power systems division. “Tis is an important project milestone in the delivery of this HVDC offshore wind connection and we are pleased it went smoothly.”
Europe’s largest intelligent network storage project S
&C Electric Europe, Samsung SDI and Younicos have signed a joint agreement to deploy Europe’s
largest intelligent network storage project onto a UK Power Networks substation, saving over £6m on traditional network reinforcement methods. By providing frequency regulation as well as load shifting, the project will also stabilise the grid much more effectively than traditional thermal generators, providing more space on the grid for clean, but intermittent renewable energies. The fully automated 6MW/10 MWh smarter network storage (SNS) battery
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technology project will be installed at Leighton Buzzard primary substation, in order to assess the role of energy storage in cost effectively delivering the UK’s carbon plan. The technology can provide a range of benefits to the wider electricity system, including absorbing energy, then releasing it to meet demand, to help support capacity constraints and to balance the influx of intermittent and inflexible low carbon technologies onto the grid. The SNS project aims to carry out
a range of technical and commercial innovations to facilitate the more efficient and economic adoption of storage.
By contrast to other electrical storage projects, it will demonstrate storage across multiple parts of the electricity system, outside the boundaries of the distribution network. By demonstrating this multi- purpose application of 6MW/10 MWh of energy storage at Leighton Buzzard primary substation, the project will explore the capabilities and value in alternative revenue streams for storage, whilst also deferring expensive conventional reinforcement measures, such as transformers, cable and overhead lines. The £13.2m project runs until
December 2016. ●
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