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.
Appreciate CleanTechnica’s originality? Consider becoming a CleanTechnica Member, Supporter, Technician, or Ambassador — or a patron on Patreon.
Environment
CPSC warns Rad Power Bikes owners to stop using select batteries immediately due to fire risk
In an unprecedented move, the US Consumer Product Safety Commission (CPSC) has issued a public safety warning urging owners of certain Rad Power Bikes e-bike batteries to immediately stop using them, citing a risk of fire, explosion, and potentially serious injury or death.
The warning, published today, targets Rad’s lithium-ion battery models RP-1304 and HL-RP-S1304, which were sold with some of the company’s most popular e-bikes, including the RadWagon 4, RadRunner 1 and 2, RadRunner Plus, RadExpand 5, RadRover 5 series, and RadCity 3 and 4 models. Replacement batteries sold separately are also included.
According to the CPSC, the batteries “can unexpectedly ignite and explode,” particularly when exposed to water or debris. The agency says it has documented 31 fires linked to the batteries so far, including 12 incidents of property damage totaling over $734,000. Alarmingly, several fires occurred when the battery wasn’t charging or when the bike wasn’t even in use.
Complicating the situation further, Rad Power Bikes – already facing significant financial turmoil – has “refused to agree to an acceptable recall,” according to the CPSC. The company reportedly told regulators it cannot afford to replace or refund the large number of affected batteries. Rad previously informed employees that it could be forced to shut down permanently in January if it cannot secure new funding, barely two weeks before this safety notice was issued by the CPSC.
For its part, Rad pushed back strongly on the CPSC’s characterization. A Rad Power Bikes Spokesperson explained in a statement to Electrek that the company “stands behind our batteries and our reputation as leaders in the ebike industry, and strongly disagrees with the CPSC’s characterization of certain Rad batteries as defective or unsafe.”
The company explained that its products meet or exceed stringent international safety standards, including UL-2271 and UL-2849, which are standards that the CPSC has proposed as a requirement but not yet implemented. Rad says its batteries have been repeatedly tested by reputable third-party labs, including during the CPSC investigation, and that those tests confirmed full compliance. Rad also claims the CPSC did not independently test the batteries using industry-accepted standards, and stresses that the incident rate cited by the agency represents a tiny fraction of a percent. While acknowledging that any fire report is serious, Rad maintains that lithium-ion batteries across all industries can be hazardous if damaged, improperly used, or exposed to significant water intrusion, and that these universal risks do not indicate a defect specific to Rad’s products.
The company says it entered the process hoping to collaborate with federal regulators to improve safety guidance and rider education, and that it offered multiple compromise solutions – including discounted upgrades to its newer Safe Shield batteries that were a legitimate leap forward in safety in the industry – but the CPSC rejected them. Rad argues that the agency instead demanded a full replacement program that would immediately bankrupt the company, leaving customers without support. It also warns that equating new technology with older products being “unsafe” undermines innovation, noting that the introduction of safer systems, such as anti-lock brakes, doesn’t retroactively deem previous generations faulty. Ultimately, Rad says clear, consistent national standards are needed so manufacturers can operate with confidence while continuing to advance battery safety.
Lithium-ion battery fires have become a growing concern across the US and internationally, with poorly made packs implicated in a rising number of deadly incidents.
While Rad Power Bikes states that no injuries or fatalities have been tied to these specific models, the federal warning marks one of the most serious e-bike battery advisories issued to date – and arrives at a moment when the once-dominant US e-bike brand is already fighting for survival.
FTC: We use income earning auto affiliate links. More.
Environment
Rivian’s e-bike brand launches $250 smart helmet with breakthrough safety tech and lights
ALSO, the new micromobility brand spun out of Rivian, just announced official pricing for its long-awaited Alpha Wave helmet. The smart helmet, which introduces a brand-new safety tech called the Release Layer System (RLS), is now listed at $250, with “notify for pre-order” now open on ALSO’s site. Deliveries are expected to begin in spring 2026.
The $250 price point might sound steep, but ALSO is positioning the Alpha Wave as a top-tier lid that undercuts other premium smart helmets with similar tech – some of which push into the $400–500 range. That’s because the Alpha Wave is promising more than just upgraded comfort and design. The company claims the helmet will also deliver a significant leap in rotational impact protection.
The RLS system is made up of four internal panels that are engineered to release on impact, helping dissipate rotational energy – a major factor in many concussions. It’s being marketed as a next-gen alternative to MIPS and similar technologies, and could signal a broader shift in helmet safety standards if adopted widely.
Beyond protection, the Alpha Wave also packs a surprising amount of tech. Four wind-shielded speakers and two noise-canceling microphones are built in for taking calls, playing music, or following navigation prompts. And when paired with ALSO’s own TM-B electric bike, the helmet integrates with the bike’s onboard lighting system for synchronized rear lights and 200-lumen forward visibility.
The helmet is IPX6-rated for water resistance and charges via USB-C, making it easy to keep powered up alongside other modern gear.
Electrek’s Take
This helmet pushes the smart gear envelope. $250 isn’t nothing, but for integrated lighting, audio, and what might be a true leap forward in crash protection, it’s priced to shake things up in the high-end helmet space.
One area I’m not a huge fan of is the paired front and rear lights. Cruiser motorcycles have this same issue, with paired tail lights mounted close together sometimes being mistaken for a conventional four-wheeled vehicle farther away. I worry that the paired “headlights” and “taillights” of this helmet could be mistaken for a car farther down the road instead of the reality of a much closer cyclist. But hey, we’ll have to see.
The tech is pretty cool though, and if the RLS system holds up to its promise, we might be looking at the new bar for premium e-bike head protection.
FTC: We use income earning auto affiliate links. More.
Georgia is putting more federal National Electric Vehicle Infrastructure (NEVI) dollars to work, with $24.4 million allocated to 26 new DC fast-charging stations across the state.
The Georgia Department of Transportation (GDOT) has selected private-sector partners to build and operate the new stations, which will be located along federally designated Alternative Fuel Corridors. Each site will have four DC fast chargers available 24/7 and, with a minimum of 150 kW per port, capable of delivering a full recharge in as little as 20 minutes, depending on the EV.
This is the second round of Georgia’s NEVI awards. GDOT mapped out 33 priority sites near highway exits and interchanges in mostly rural areas to close gaps left after the first round in 2024. The response was strong: the EV charging industry submitted 41 proposals to cover 26 of those locations.
Six winners were selected: Pilot Travel Centers, Silver Comet Energy, Universal EV, PowerUp America, Love’s Travel Stops, and EnviroSpark Energy Solutions.
Governor Brian Kemp (R-GA) said, “We appreciate Georgia DOT for fulfilling the state’s commitment to a robust, reliable fast-charging network that meets federal standards and serves communities across Georgia.”
Georgia was allocated about $135 million through the NEVI program, part of President Joe Biden’s Bipartisan Infrastructure Law. The federal program covers up to 80% of the project costs, with private partners covering the balance.
Round 2 follows a legal battle earlier this year, when a lawsuit filed by several states (not Georgia) compelled the Trump Administration to release funds owed from the NEVI Formula Program. A federal judge blocked the Trump administration’s illegal attempt to obstruct the NEVI program in June, clearing the way for planned NEVI EV charging projects to continue.
Read more: Court says US must free up billions in illegally-frozen electric car charger funds
If you’re looking to replace your old HVAC equipment, it’s always a good idea to get quotes from a few installers. To make sure you’re finding a trusted, reliable HVAC installer near you that offers competitive pricing on heat pumps, check out EnergySage. EnergySage is a free service that makes it easy for you to get a heat pump. They have pre-vetted heat pump installers competing for your business, ensuring you get high quality solutions. Plus, it’s free to use!
Your personalized heat pump 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. – *ad
FTC: We use income earning auto affiliate links. More.
-
Sports2 years agoStory injured on diving stop, exits Red Sox game
-
Sports3 years ago‘Storybook stuff’: Inside the night Bryce Harper sent the Phillies to the World Series
-
Sports2 years agoGame 1 of WS least-watched in recorded history
-
Sports3 years agoButton battles heat exhaustion in NASCAR debut
-
Sports3 years agoMLB Rank 2023: Ranking baseball’s top 100 players
-
Sports4 years ago
Team Europe easily wins 4th straight Laver Cup
-
Environment3 years agoJapan and South Korea have a lot at stake in a free and open South China Sea
-
Environment1 year agoHere are the best electric bikes you can buy at every price level in October 2024