Compact Medium-Voltage Converters To Enable Advanced Grid Architectures & Operations
As we trend toward more renewables and distributed energy resources (DERs), the design of the electric distribution system itself imposes physical limitations. These system constraints could lead to issues like overloaded power lines and faults that propagate freely.
But what if we could restructure the underlying system to support greater renewable integration and system resilience? To that end, a National Renewable Energy Laboratory (NREL)–led project is working on a new type of grid device enabled by silicon carbide (SiC) switches and other medium voltage (MV) power electronics that could segment sections of the grid, providing advanced control for flexibility and resilience for our power systems.
The project team is first designing a megawatt-scale prototype converter that provides native “back-to-back” conversion — AC to AC power — at distribution voltages (i.e., not requiring transformers to step down voltage to levels typically used in electronic power conversion). By using MV SiC-based power modules, the converters could be 1/5th the size and 1/10th the weight of alternate equivalent systems, which are trailer-sized and include heavy transformers. Then the team will connect the power converter into NREL’s MV testbed to validate new grid control approaches that the prototype enables.
The project is named “Grid Application Development, Testbed, and Analysis for MV SiC (GADTAMS)” and is funded by the Department of Energy’s Advanced Manufacturing Office.
The NREL-led GADTAMS project is developing and demonstrating smaller and lighter alternatives for direct medium-voltage connections on the grid, which could enable new resilient grid architectures.
“With back-to-back converters between feeders, we can go one step higher in providing resilience across the distribution system,” said Akanksha Singh, a project lead at NREL.
“This technology wasn’t necessary before because we didn’t have so many distributed energy resources on the system, but now we have feeders that are becoming saturated with PV; apart from storage, these feeders don’t have anywhere to inject that excess power,” Singh said. “A new approach to grid interconnection could enable advanced forms of power sharing and provide much-enhanced grid resilience.”
A future grid that features such converters would have the capability to control the flow of power between sections of the grid, shunting excess load or DER-based generation to feeder sections or adjacent circuits as needed, adding new versatility to power distribution. Networked microgrids could protect against the propagation of faults from one microgrid to the next while still allowing controlled power dispatch between the two systems and the macrogrid as well.
During outage recovery, microgrids could be formed that then stabilize neighboring microgrid systems, as envisioned in NREL’s autonomous energy systems research. In general, the two sides of the converter do not need to be synchronized in frequency or even exact voltage level at all — a major shift from the modern power system. But prior to proving any of these applications, NREL and others will first need to build the necessary controls.
“We are developing very novel controls for upcoming grid architectures,” Singh said. “We have local controls on inverters, and we have hierarchical controls that coordinate between grid partitions. With regard to grid support, these controls can do it all: dynamic stability, frequency support, black start, fault ride-through and protection.”
Unlike anything currently available, the NREL testbed provides an environment to validate medium-voltage grid solutions with real power hardware-in-the-loop and real-time grid simulation. For this project, NREL and partners are interested in the full range of use cases for back-to-back SiC converters and have teamed with utility Southern California Edison to inform on utility applications, as well as industry partners General Atomics and Eaton to seek out a commercial path for the technology.
The SiC converter is being built in two halves by project partners Ohio State University and Florida State University. The three-phase converter prototype will be rated for 330 kW and will implement a full thermal and electrical design appropriate for utility use. Traditionally, the same AC-to-AC conversion process requires stepping-down the voltage to low-voltage levels where conventional power electronics can be used, which results in heavy and expensive transformer equipment. The MV SiC option takes advantage of the superior voltage ratings of devices to minimize weight, cost, and size, which makes the technology far more practical and economical for system-wide deployment.
Still, the converter technology is only one aspect of fulfilling flexible interconnections. This framework currently lacks the standardization that exists for so many other recent grid innovations. At NREL, the project team hopes to collect baseline operational data to jumpstart the conversation around how to integrate MV converters in future grids.
“This is a new application that doesn’t exist anywhere yet. We need standards that apply to how the converters can integrate with regular system operation, like starting up, syncing to the grid, etc.,” Singh said. “We are using IEEE Standards 1547 and 2030.8 as a base, interpreting their rules to implement new controls on MV systems. We are trying to merge the two to understand what will apply to this new approach.”
An entirely new grid architecture and operational flexibility could seem far-out for now, but NREL and partners are showing that these options are viable in the near-term and that NREL has the capability to prepare these solutions for real systems. Learn more about how NREL can validate advanced energy systems at scale.
Article courtesy of NREL.
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Italian electric motorcycle manufacturer Energica has just been handed a lifeline. Previously owned by US company Ideanomics, the famed motorcycle brand entered insolvency late last year after a period of financial duress prevented it from making payroll and continuing production.
Now, a new group of investors from Singapore has stepped in to take over.
The news was shared on Energica’s YouTube channel, and the company confirmed on LinkedIn that “The judicial process undergoing the sale of Energica has received an offer with a significant deposit from investors based in Singapore.” Energica says that the investors, who so far remain unnamed, “are enthusiasts that believe in, and share the common values of Energica.”
While it’s not certain how the buyout and revival will unfold, it appears that Energica is planning on getting the band back together. “If the process comes through successfully,” the company explained, “the same team behind Energica will be entrusted to run the operations, and we will continue creating cutting-edge technologies for our customers.”
With many of Energica’s impressive electric motorcycles already in circulation from years of sales leading up to the 2024 bankruptcy, the company seems focused on starting by supporting those riders. ” Our first order of business is to support the customers and community. The judicial process will be completed in 60 days, and we will continue to share updates during the time.”
Energica rose to fame by building high-performance electric motorcycles in Modena, Italy, and was one of the early pioneers in the premium electric two-wheeler space. Its lineup includes models like the Experia electric touring bike and the Ego sportbike. The company previously supplied race bikes for the MotoE World Cup until Ducati took over the role in 2023.
After being acquired by US-based Ideanomics in 2021, Energica initially benefited from an injection of capital that helped expand production and dealer networks. But Ideanomics itself has faced serious financial trouble, becoming unable to invest in the future of Energica.
Energica’s future prospects seemed dim at the time of its insolvency in 2024, but the uncertainty appears to be clearing with the hope that new owners can breathe fresh life into the company.
Even so, Energica’s core competency is building the fastest, most powerful, and longest range production electric motorcycles the world has ever seen, and that’s not exactly an inexpensive enterprise. Combined with current market trends that favor smaller, lighter, and less expensive commuter-spec electric motorcycles, it begs the question of whether or not a newly revived Energica will find a receptive market, or whether the company will be forced to expand the scope of its products to match better the type of electric motorcycles that are selling today.
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Chinese carmaker XPeng is getting perilously close to bringing its AeroHT consumer eVTOL concept to market, thanks to a $250 million Series B round that’s set to accelerate the company’s modular “flying car” production plans.
XPeng subsidiary AeroHT had its first successful proof of concept test flight ahead of the brand’s annual 1024 back in 2023, where the company unveiled a pair of flying car designs. The X3 is an actual flying “car” that can drive, park, and take off on its own, and a second, modular eVTOL that folds up into the back of an electric van called the Land Aircraft Carrier.
That vehicle pair, shown at CES in January, was set to begin production this year, with the eVTOL component set to begin production in 2026 – and that’s looking a lot more likely thanks to the new infusion of capital!
AeroHT at CES 2025
Xpeng Aeroht raised $150 million in Series B1 funding last August, before launching its Series B2 funding round. The most recent announcement that the company has secured an additional $100 million in its Series B2 funding round brings the total amount raised to more than $750 million, with a $1B pre-revenue valuation.
CNEVPost reports that company aims to establish itself as a commercial pioneer in urban air mobility ahead of a potential IPO – and may get there sooner than later, thanks to several hundred pre-orders at the $280,000 projected price.
Electrek’s Take
Scooter Doll said it best, writing, “this footage (of the AeroHT test flight) is as scary and concerning as it is exciting and awe-inspiring.” Which is to say that these things are real, they seem like they’re getting built, and they seem like they’ll sell well enough to convince at least one or two remaining boomers that the flying car they’ve been promised their whole lives is – finally! – coming to market.
Here’s hoping.
SOURCE: Xpeng, via CNEVPost; gallery photos by the author.
If you’re considering going solar, it’s always a good idea to get quotes from a few installers. To make sure you find a trusted, reliable solar installer near you that offers competitive pricing, check out EnergySage, a free service that makes it easy for you to go solar. It has hundreds of pre-vetted solar installers competing for your business, ensuring you get high-quality solutions and save 20-30% compared to going it alone. Plus, it’s free to use, and you won’t get sales calls until you select an installer and share your phone number with them.
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Flooring manufacturer Beauflor USA just turned on the biggest rooftop solar system by capacity in metro Atlanta — and it’s now powering part of its Georgia factory.
The new 1,040 kW system in Cartersville officially beats metro Atlanta’s previous rooftop solar record of 1,034 kW. The new array produces enough energy to power more than 100 homes. The system is expected to cover about 10% of Beauflor’s electricity needs and cut its carbon emissions by about 920 metric tons annually.
“This solar installation represents our commitment to sustainable manufacturing practices while making sound business decisions,” said Emile Coopman, continuous improvement manager at Beauflor. He added that the system is designed with room to grow: “This is the first step toward more renewable energy.”
The company partnered with Cherry Street Energy to install the nearly 2,000-panel system, which was completed in less than four months. Cherry Street invested $1.8 million into the project and is covering all construction and maintenance costs through a 30-year energy procurement agreement. Beauflor will buy solar power directly from Cherry Street, allowing it to avoid upfront capital costs while still lowering its energy bills.
“As Georgia’s manufacturers ramp up production amid rising costs for grid energy, sophisticated operators seek ways to quickly and sustainably address their energy needs,” said Cherry Street CEO Michael Chanin. “On-site solar with no capital expense delivers just that: reliable, affordable electricity.”
Chanin added that the system’s power output is especially impressive: “The previous record-holder for metro Atlanta’s largest rooftop solar required over 4,000 panels. We’re using less than 2,000 to reliably generate even more power.”
Read more: This is New Jersey’s largest high-rise residential rooftop solar array
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Your personalized solar quotes are easy to compare online and you’ll get access to unbiased Energy Advisors to help you every step of the way. Get started here.
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