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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Days after teasing a major reveal at the 2024 Specialty Equipment Market Association (SEMA) show, Kia has unveiled two unique and custom-built EV concepts designed for adventure off-road. During the unveiling, we got a look at a new spin on the ever-popular EV9 SUV called the “ADVNTR” and a rugged take on one of Kia’s new purpose-built vehicles (PBVs), the PV5, called “WKNDR.”
On October 30, Kia America posted a clandestine press release about an upcoming reveal at the annual SEMA show in Los Angeles. The first release featured a shadowy image of what appeared to be some off-road vehicle, with its recognizable Kia front fascia shining at the camera lens. The text read, “All roads lead to SEMA.”
We speculated that SEMA might be the event where Kia finally unveils the first of its two promised BEV pickup trucks. Since the headlamps closely resembled those of an EV9, we thought it could be the mule pickup we reported being tested in the US earlier this year. We were close.
Later that same day, Kia followed up with a second press release with the same title and quote but an image of a different off-road EV shining through the darkness, one that was much less recognizable.
Both releases had fine print stating that the vehicle in each image was a concept, so we curbed our expectations heading into this week’s 2024 SEMA show. This morning, Kia officially unveiled these two new off-road concept EVs, and they’re pretty cool looking. Have a gander at the EV9 ADVNTR and the PV5 WKNDR.
Kia unveils off-road concepts of its EV9 and PV5 EVs
According to the Korean automaker, designers from Kia Design Center America (KDCA) in Irvine, CA, imagined both off-road concepts. SEMA is usually a stage for OEMs to showcase concepts and accessories that are more rugged or heavy-duty.
Hence, the Kia team brought its A-game to Vegas with two new concept EVs that “intrinsically blend form and function into machines designed for responsible engagement with nature.”
The first is the EV9 ADVNTR, based on the three-row SUV that contributed to record sales for Kia in the US in October. Today, Kia shared that its off-road concept version of the EV9 is equipped with new custom front and rear facias, reinforced rocker panels, and rugged tires for more maneuverability in the elements.
Additionally, the EV9 ADVNTR can lift 3 inches higher than the standard 2025 SUV model and features a new roof rack that can haul luggage and hiking gear or support a roof-mounted tent.
In addition to the EV9 ADVNTR, Kia unveiled an off-road concept version of its new PV5 called the WKNDR. The PV5 is a middle-of-the-pack BEV in Kia’s latest ‘Purpose Beyond Vehicle’ lineup, which debuted at CES 2024.
While the standard PV5 was designed for commercial operations and last-mile deliveries, the Kia design team decided to take it off-road with the new WKNDR concept. This BEV van has been lifted and rigged with some hefty off-road tires, but like its predecessor, the interior of the PV5 WKNDR is what truly stands out.
Kia describes the off-road concept van as a “Swiss Army Knife on wheels,” offering a modular cabin that can be customized to an owner’s wants and needs. The conceptual design features a first-of-its-kind storage solution called the “Gear Head” feature that delivers off-board, sheltered storage space for equipment when the vehicle is stationary, maximizing interior space while providing owners with easy access to all their belongings.
Thanks to its modularity, Kia shared that the off-road van’s “Gear Head” space can also be converted into a mobile pantry for those foodies who want to assemble an array of cuisine while parked out in nature, or anywhere for that matter.
Kia also shared that its team designed the PV5 WKNDR to be self-sufficient as an off-road BEV. It features solar panels and hydro turbine wheels that can recharge the vehicle’s batteries and power other components, like an onboard compressor.
Since these remain mere concepts, we don’t have any performance specs for the Kia EV9 ADVNTR or PV5 WKNDR, nor can we confirm that either model will reach bonafide production for sale. However, Kia is thinking beyond its current lineup and is at least flirting with the idea of delivering some new models that would compete against the likes of Ford, Rivian, and recent reveals from VW Group’s Scout Motors.
At the very least, we may see some of these features and design elements in Kia’s upcoming BEV pickups. For now, however, these off-road EV concepts are an exciting exercise in design that once again shows how innovative and creative Hyundai Motor Group is across virtually all BEV segments.
We hope to see more concrete unveilings from the Korean automaker soon.
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With big discounts and lower-priced models hitting the market, electric vehicles are getting more and more affordable. Here are the EVs you can drive off in this November with lease prices under $300 a month.
EVs for lease for under $300 a month November 2024
New models like the Honda Prologue and Chevy Blazer, Equinox, and Silverado EVs are rolling out nationwide, giving buyers more options than ever.
According to Cox Automotive, over 100,000 EVs were sold in the US in September, the sixth straight month topping the 100K mark. Electric vehicles accounted for 9% of the US auto market, its highest to date.
The average transaction price (ATP) for new EVs was $56,328, but drastically higher incentives bring prices on par with or even under many comparable gas cars.
For example, the Honda Prologue electric SUV is available to lease for as low as $295 per month, including the down payment. That’s cheaper than a Honda Civic at $376 per month.
The Honda Prologue is one of the best EVs to lease this November. Here are the other models worth considering this month.
| Lease From | Term (months) |
Due at Signing | Effective rate per month (including upfront fees) |
|
| 2024 Nissan LEAF | $109 | 36 | $2,529 | $179 |
| 2024 Kia Niro EV | $169 | 24 | $3,999 | $336 |
| 2024 Kia EV6 | $179 | 24 | $3,999 | $346 |
| 2024 VinFast VF 8 | $199 | 36 | $894 | $244 |
| 2024 Hyundai IONIQ 5 | $159 | 24 | $3,999 | $326 |
| 2024 Honda Prologue | $259 | 36 | $1,299 | $295 |
According to online auto research firm CarsDirect, the Nissan LEAF retained the title of the cheapest EV you can lease in November listed at just $109 per month in Colorado.
With $2,529 due at signing, the effective monthly rate is just $179. However, the deal only includes state incentives, not offered elsewhere.
Kia’s Niro EV and EV6 are two of the best EV lease options this month, with monthly rates of $169 and $179.
After a recent price cut, the EV6 is offered at its lowest monthly rate since hitting the market. That’s for the Light Long-Range model with up to 310 miles of range.
The Hyundai IONIQ 5 remains a top lease option in November, with the updated 2025 model set for deliveries later this year. With lease prices starting at just $159 per month, Hyundai is offering its best-selling electric SUV at closeout prices.
Honda factors in a $1,000 conquest or loyalty offer in the lease deal. However, for a $48,000 electric SUV, the Prologue is still a steal.
Although not under $300, the Subaru Solterra is also worth considering at just $329 per month with no money down.
Ready to find your new EV? We can help you get started. Check out our links below to find the best deals on popular electric models in your area.
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