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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Isuzu is giving Red Bull electrified wings – the iconic drinks company is officially the first to put the production version of its new-for-2025 Isuzu NRR-EV medium duty electric box truck to work in North America.
Deployed by Red Bull North America, these first-ever customer Isuzu NRR-EV medium duty trucks are busy delivering cans of Red Bull products throughout Southern California with zero tailpipe emissions, marking the first time the best-selling low-cab/cabover box truck brand in the US can make such a claim.
“Today marks a major milestone for the industry and for us. Watching the NRR-EV evolve from a concept to a viable operating product is a big deal,” explains Shaun Skinner, President of Isuzu Commercial Truck of America. “Our teams and our clients have put so much time and effort into making this happen, and it speaks to our teamwork and dedication to more sustainable transportation solutions. It is no longer just a plan, we have zero-emission trucks serving our customers’ needs!”
The NRR-EV is available with a number of different battery configurations, ranging from three 20 kWh battery packs (60 kWh total) up to nine 20 kWh battery packs, with five and seven pack options in between. The nine-pack version is good for up to 235 miles of range with a 19,500 lb. GVWR. The batteries, regardless of configuration, send power to a 150 kW (200 hp) electric motor with 380 lb-ft. of torque available at 0 rpm.
For “Red Bull” duty, the Isuzu trucks ship with a 100 kWh total battery capacity, and are fitted a lightweight, all-aluminum 6-bay beverage body, the vehicle’s design maintains its cargo capacity. The NRR-EV’s 19,500 lb. GVWR (Class 5) chassis, combined with the lightweight body and “big enough” battery spec provides Red Bull’s delivery drivers a hefty, 9,000 lb. payload.
Isuzu began assembling NRR-EV trucks at its Charlotte, Michigan assembly plant in August 2024. Customer deliveries are set to begin nationally in Q1 of 2025.
Electrek’s Take
Isuzu’s N-series trucks are everywhere – and for good reason. They’re dependable, they’re affordable, and they have a nationwide network of GM dealers supporting them. I am a huge fan of these trucks, and can’t wait to sample the electric version from behind the wheel.
SOURCE | IMAGES: Isuzu.
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Hyundai is gearing up to launch its first all-electric minivan. Production is set to begin next year, and the EV minivan is expected to play a key role in its global expansion. Here’s what to expect.
Hyundai will launch its first EV minivan in 2025
The Staria is Hyundai’s successor to the Starex, its multi-purpose vehicle (MPV), launched in 2021. Like its replacement, the Staria is offered in a minivan, minibus, van, pickup, and several other configurations like limousines and ambulances.
Although the Staria was launched with only diesel and gas-powered powertrain options, Hyundai added its first hybrid model in February.
Hyundai will introduce the Staria Electric, its first electric minivan, next year. In March, Hyundai unveiled its new ST1 electric business van, which is based on the Staria. However, the minivan will get its own EV model in 2025. The ST1 is Hyundai’s first commercial EV. It’s available in refrigerated van and basic chassis cab options.
Hyundai is already building gas-powered and hybrid Staria models at its Ulsan plant in Korea, but it is preparing to begin producing the EV version.
According to the Korean media outlet Newsis, sources close to the matter on Friday said Hyundai will begin converting a production line (Line 1) at its Ulsan Plant 4 for Staria Electric around January 25, 2024.
The expansion is part of Hyundai’s broader plan to introduce 21 electric vehicles by 2030, accounting for over 2 million in sales.
A report from The Korean Economic Daily in June claimed Hyundai would expand Staria EV production into Europe starting in the first half of 2026. European-made models will be sold domestically and overseas, like in Australia and Thailand. Hyundai aims to sell 15,000 to 20,000 of the EV model annually.
The Staria Electric will be powered by Hyundai’s fourth-generation 84 kWh EV batteries and will have over 10% more capacity than the ST1.
Hyundai sold 37,769 Starias through the first 11 months of 2024. Last year, Hyundai Staria sales reached 39,780, including domestic and export sales. By the end of the year, Staria sales are expected to exceed 40,000 for the first time.
Hyundai’s sister company also has big plans to expand its commercial business with a new lineup of EVs based on its PBV (Platform Beyond Vehicle). Its first electric van, the PV5, was spotted earlier this year as a potential Volkswagen ID.Buzz challenger.
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Just a year after it hit the 1 million electric mile mark, Schneider National ($SNDR) and its unmistakable orange semi trucks have thrown down the gauntlet – adding more than 5 million miles to its BEV tally and crossing the 6 million electric mile mark!
The company says this latest all-electric milestone means Schneider has cut more than 20 million pounds of harmful carbon emissions. A total it says is equivalent to removing more than 2,100 gas-powered passenger cars from the road.
“Reaching 6 million zero-emission miles is a testament to our steadfast dedication to sustainability and innovation,” said Schneider President and CEO, Mark Rourke. “Leading the way in adopting electric vehicle technology not only benefits the environment but also serves as an example of the broad service capabilities and flexibility we can offer to customers.”
Schneider operates one of the largest fleets of Freightliner eCascadia electric semi trucks in the country, with fully 92 of the BEVs deployed (so far). The trucks have been operating in and around the ports of Southern California, where they have significantly reduced emissions and contributed to cleaner air quality while reliably transporting freight and saving SNDR money.
“Schneider is a great example of the kind of forward-thinking entrepreneurship our industry needs,” says David Carson, Senior Vice President, Sales and Marketing at DTNA. “They’ve achieved over 6 million zero emission miles, which is a reminder for us all to keep working on overcoming challenges together on the path to zero emissions. At DTNA, we’re committed to the shift to zero emissions, alongside pioneers like Schneider, who are showing us what’s possible.”
Fifty of Schneider’ 92 eCascadias were funded by JETSI – a California-wide initiative working to reduce greenhouse gas emissions. Of the remaining 42 five are jointly funded by the EPA’s FY18 Targeted Airshed Grant, seven are funded by the Volkswagen Environmental Mitigation Trust, and 30 are funded by California’s HVIP incentive program.
Electrek’s Take
Schneider is among the many global fleets that are proving the reliability and efficacy of battery-electric semi trucks every day, racking up millions of miles faster than many of the nay-sayers thought would be possible. The only real question facing the world of electric trucking now is whether the legacy brands like Freightliner and Volvo have established an insurmountable lead over Tesla.
SOURCE | IMAGES: Schneider, via BusinessWire.
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