Tech
Test procedure developed for gridforming inverters
In addition to expanding renewable energy generation, a successful energy transition requires stable system operation at all times. To achieve this, renewable energies and storage power plants will have to take on extensive system services and essential grid-forming properties in the future.
In the “GFM Benchmark” project, Fraunhofer ISE developed a test procedure for grid-forming inverters on behalf of the four German transmission system operators and applied it to devices from various manufacturers. On the one hand, the project provided a comprehensive overview of the market readiness of grid-forming inverters.
On the other hand, the project results provide an important practical check for new national and European testing standards.
The fully integrated grid components with grid-forming properties planned by the transmission system operators will not be able to fully meet the demand for grid-forming power. Therefore, customer systems must also contribute to stabilizing the power grid: They should behave in a grid-forming manner, i.e., contribute to providing a grid voltage with stable amplitude and frequency.
But what exactly does that mean? In recent years, many scientific studies and publications have been produced on this topic, and some countries have grid operator documents that describe grid-forming behavior. However, there is no uniform standardization or definition, which leaves room for interpretation.
Therefore, in the first step of the project, the Fraunhofer ISE team worked with the grid operators 50Hertz Transmission GmbH, Transnet BW GmbH, Amprion GmbH, and Tennet TSO GmbH to develop a measurement and evaluation procedure for the stabilizing properties of inverters, incorporating findings from both grid operation and research.
Major differences in grid-forming behavior
“We wanted to see what manufacturers understand by grid formation and how they implement this in the programming of their devices,” explains department head Dr. Sönke Rogalla from Fraunhofer ISE. “So we invited them to put their devices to the test in our laboratory.”
Seven companies responded to the call and had their storage inverters, which cover a power range from a few kilowatts to five megawatts, measured according to the new test procedure. They came from different countries and were at different technology readiness levels, from pilot to prototype to series production.
The researchers used the tests to investigate the differences between the devices in terms of grid formation by exposing them to various operating conditions in the laboratory. In addition to normal operation, critical grid situations such as rapid frequency changes, short circuits, and phase jumps were simulated.
“The devices exhibited similar behavior under clearly defined requirements. In other cases, however, there were major differences, and we were able to provide the manufacturers with suggestions for optimization for almost every device,” explains project manager Roland Singer from Fraunhofer ISE. The willingness and commitment of manufacturers to advance the development of grid-forming inverters is high.
Proven verification methods are essential for market launch
At the same time, the project provided relevant practical experience in testing grid-forming inverters and optimized the test procedures. Important findings were incorporated into the ongoing standardization work at the European level even during the project phase. The Fraunhofer ISE team contributed its expertise to the creation of the VDE FNN note “Grid-forming properties.”
The recently published document describes the requirements and verification procedures for grid-forming units. It forms the normative basis for participation in the future market for instantaneous reserve, which will start at the beginning of 2026 and represents an additional interesting remuneration path, especially for battery storage systems.
With its experience in the “GFM Benchmark” project, the team at Fraunhofer ISE is ideally positioned to support manufacturers and users of grid-forming units with certification measurements in accordance with the FNN note. Standardization work at the European level is also progressing. ENTSO-E, the network of European transmission system operators, is working on an implementation guide with comprehensive grid-forming requirements, which should facilitate the transition to national regulations.
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Tech
This Is the Only Office Lamp That Does Double Duty on My Nightstand
The base of the lamp has two slider buttons. One toggle adjusts the warmth, from cold white light all the way to red. One adjusts the intensity, from ultra-bright down to a glareless glow. Hard taps on each button skip ahead, while holding the toggle down on one side or another adjusts the light settings quite slowly—slowly enough I at first sometimes question whether it’s happening.
The maximum brightness is 1,000 lumens—the approximate intensity of a 75-watt incandescent bulb. At this brightness, the battery lasts about five hours. At a lower intensity, this can extend to as long as a dozen hours.
Red Shift
Photograph: Matthew Korfhage
There’s an added feature I have come to appreciate at night, which is the red-light mode. There’s little evidence that blue light from your little smartphone is keeping you awake at night. But numerous studies do show that blue light wavelengths can affect melatonin levels and thus your body’s circadian rhythm, while red light doesn’t do this.
Red light therapy is, of course, the province of TikTok as much as science—a field where wild exaggerations live alongside legitimate uses and benefits. For every sleep study showing that red light is superior to blue light when it comes to melatonin levels, there’s another showing that red light is associated with “negative emotions” before bed.
So I can only offer my own experience, which is that Edge Light Go’s red reading light offers me a pleasant liminal space between awake time and sleepy time, one not offered by a basic nightstand lamp. It allows me to sort of bask in a darkroom space that still lets me see and read, and drift off a little easier.
If I fall asleep, the light has an automatic 25-minute shut-off, which means I won’t do what I far too often do, which is drift off while reading and then wake up, alarmed, to a room filled with bright light in the middle of the night.
Caveats and Quirks
Photograph: Matthew Korfhage
This said, for all the virtues of portability, the Edge Light Go does not boast a base that’s heavy enough to stop the lamp from tipping over if I bend it forward from its lowest hinge. This can be an annoyance when trying to use the lamp as a reading light from a bedside table or the arm of a couch.
Tech
Freshwave claims next evolution of 5G indoor mobile | Computer Weekly
With reliable mobile connectivity still a major issue inside modern office buildings – particularly as energy-efficient materials block signal and user expectations remain high – connectivity infrastructure-as-a-service (IaaS) provider Freshwave has launched 5G on Omni to offer businesses “assured” indoor 5G connectivity from all the mobile network operators (MNOs).
Freshwave said that its mission is to invest expertise and capital to assure connectivity, bringing mobile operators, central and local government, and real estate providers to work together in new ways. It added that it has connected some of the biggest, most challenging wireless environments in the UK, including several central London boroughs and more than 2,000 buildings.
At launch in June 2024, the company’s Omni Network was described as a world first, offering 4G mobile connectivity indoors from all the UK mobile network operators via a combined small cell unit. It boasts more than six million square feet of real estate live or in-build.
Omni Network was previously only available on Andrew Onecell, but the solution is now multi-supplier, being available using Ericsson Radio Dot technology which is seeing use in the new 5G on Omni offer.
In another claimed first and the next stage in the evolution of the Omni Network, 5G on Omni is designed to deliver 4G/5G connectivity indoors from all the UK MNOs – EE, O2, and VodafoneThree – via the Ericsson’s Radio Dot System, extending the 5G carrier-grade mobile coverage to more spaces than ever before.
Aiming to address the aforementioned issue whereby building materials can potentially block mobile signals from reaching indoors, Freshwave said its dedicated multi-operator in-building mobile system can ensures everyone inside has the mobile connectivity they need, no matter which network they’re on.
Connecting securely to the MNOs’ networks, 5G on Omni is configured and controlled by Freshwave’s engineers via the company’s datacentre as a fully managed service. For organisations whose connectivity needs are met by 4G today, 5G on Omni provides a simple software upgrade path to 5G when required.
In addition, the company said that 5G on Omni uses up to 50% less energy than a traditional distributed antenna system (DAS), is faster and more cost effective to deploy with less cabling, and needs less space in the comms room.
Remarking upon the launch and its objectives, Simon Frumkin, Freshwave’s CEO, said: “After a world-first with Omni Network, I’m delighted we’re now able to offer our customers another first with 5G on Omni. It’s the next stage of assured indoor mobile connectivity, bringing all the operators indoors on 5G via small cells.
“Indoor connectivity is an essential productivity driver, as evidenced by our Mobile connectivity ROI index which found that the UK could gain £70bn of added value by eliminating mobile signal not-spots indoors. 5G on Omni represents an important step forward for indoor connectivity in the UK. We’re grateful to all the UK mobile operators and to our technology partner Ericsson for their collaboration in making this possible.”
Luca Orsini, head of Ericsson North Europe, added: “We’re thrilled to have collaborated with neutral host provider Freshwave to deliver 5G from all UK mobile operators on the Ericsson Radio Dot for the very first time. It highlights how shared indoor infrastructure can accelerate high-quality 5G coverage and capacity at a lower total cost of ownership than legacy solutions, ensuring organisations and users benefit from seamless connectivity regardless of their mobile provider.”
The service is also available via a pay-as-you-occupy model, which allows landlords to pay to cover shared areas in a building, while giving tenants the ability to contract directly with Freshwave to join the in-building system as and when they move in.
Freshwave claims 5G on Omni is already seeing strong demand and that it is in the process of deploying it at several other customer sites this year across sectors including financial services, luxury goods brands and a global fast moving consumer goods company. One of the early adopters of the service has been flexible office provider Workspace’s Record Hall site in central London, bringing 4G/5G mobile signal from all the MNOs to the offices and workshops there.
“Good connectivity should be something our SME customers don’t have to think about,” said Chris Boultwood, head of technology at Workspace. “With 5G on Omni from Freshwave now live at Record Hall, our customers can rely on seamless mobile coverage throughout the building, whichever network they use.”
Tech
SITA launches campus network to keep airport operations connected | Computer Weekly
For airlines to run critical operations on networks that are set up and run for them, removing the complexity and cost of managing connectivity themselves, air industry tech firm SITA has launched a new network solution designed to support the demands of complex airport and transport environments.
With around 2,500 customers, SITA technology supports more than 1,000 airports and more than 19,600 aircraft worldwide. The company said that it also helps more than 70 governments “strike the balance between secure borders and seamless journeys” and connects 45-50% of the industry’s data exchange to enable complex global networks to operate smoothly and reliably.
As part of the latter aim, the SITA Campus Network, powered by HPE Aruba Networking, aims to offer a managed network service covering more than 150 countries wherein SITA takes care of the design, procurement, shipping, installation, configuration and support for all devices involved. Boasting a low total cost of ownership (TCO), SITA is proposing “one of the most competitive” fully managed local area network/wireless local area network (LAN/WLAN) available in the industry.
Explaining the rationale for the launch, SITA noted that managing networks across multiple locations, devices and suppliers is complex and costly. Furthermore, it said that when networks are fragmented, performance suffers and disruptions can spread quickly.
SITA Campus Network is attributed with being able to remove this burden by delivering a fully managed network across wired and wireless environments. The campus network is claimed to combine “robust” connectivity with centralised, cloud-based management to ensure consistent, reliable performance across airport campuses and other large transport hubs.
Designed for high-density environments such as terminals, hangars and airline operations centres, the solution is said to support large volumes of users and devices without compromising performance, even during peak demand. By integrating HPE technology into its managed service, SITA’s customers get a network that is centrally operated by SITA while retaining the flexibility to use different technologies and vendors.
Available in more than 145 countries, with 24/7 operational support, SITA assured that by reducing the need for costly hardware and simplifying operations the network lowers both upfront investment and ongoing costs. Its pay-as-you-go model allows customers to scale usage up or down based on demand, with rapid deployment across locations.
This is said to reduce the need for on-site support, spare equipment and recurring training, freeing up IT teams to focus on higher-value activities. Where needed, the campus network connects to SITA’s global wide-area network services. This connectivity links more than 600 airports worldwide.
As is the norm with other leading networking solutions, the SITA Campus Network uses AI to improve visibility across the network, detect issues earlier and automate troubleshooting, helping reduce downtime. It also provides centralised management, allowing infrastructure and devices to be monitored and controlled across both on-site systems and remote environments.
Martin Smillie SITA senior vice-president of communications and data exchange, said integrating diverse systems and devices across airport environments is becoming more complex as operations become more connected: “At the same time, expectations on performance, resilience and security continue to rise. With SITA Campus Network powered by Aruba, we take on that complexity. We deliver a network that is set up, run and continuously optimised, so our customers can focus on keeping operations moving while maintaining control across increasingly demanding environments.”
Sujai Hajela, executive vice-president and general manager for enterprise campus and branch at HPE, added: “Airports and airlines have to support thousands of staff, passengers and mission critical systems across terminals, gates and airside areas – and any network issue shows up immediately as delays and frustration.
“SITA Campus Network powered by HPE Aruba Networking is built on our secure, AI-native technology to deliver a self-driving network that spots and fixes problems in real time, often before anyone notices, so operations keep moving and passengers stay connected.”
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