The demand for high-power charging infrastructure is growing fast — and the pressure to deliver is real.
Electric heavy-duty trucks need shorter charging stops to keep fleets moving. Mining vehicles can't afford lengthy downtime. Ships have tight port windows to work within. Public charging stations have to handle a wide mix of vehicles, each with different power requirements.
But building a genuine megawatt-class charging station still comes down to two persistent challenges: conventional charging equipment lacks the output capacity for truly high-speed charging at this scale, and the number of separate components involved — along with complex installation, high operating losses, and ongoing maintenance — keeps both build costs and running costs stubbornly high.
CEEG's Megawatt Flash Charging Transformer
CEEG's answer is the Megawatt Flash Charging Compact Substation, built around a proprietary phase-shift rectification technology and a phase-shift dry transformer + power module architecture. It brings together four functions in a single prefabricated enclosure: medium-voltage input, voltage transformation, charging power conversion, and terminal power supply. From a 10kV medium-voltage grid connection through step-down, rectification, voltage regulation, power distribution, and end-point charging — the entire process is handled in one integrated unit.
The solution is built around six practical outcomes: faster station construction, faster vehicle charging, faster return on investment, reduced footprint, shorter installation time, and lower electricity costs.
Faster Grid Connection: Getting High-Power Charging onto the Grid Without the Headaches
The higher the charging power, the greater the instantaneous load drawn from the grid — and the harder the upstream supply infrastructure has to work.
The grid delivers AC. Vehicle batteries need controlled DC. That conversion — rectification — is where conventional systems run into trouble.
In a standard rectifier design, semiconductor switching characteristics cause the input current to take on a stepped, pulsed waveform rather than a clean sine wave. The distortion generates significant harmonic currents on the grid side. At low power levels, this is manageable. At megawatt scale, it isn't — harmonics multiply losses in cables, transformers, and switchgear, and if left unaddressed, they degrade power quality, risk pushing grid harmonic levels beyond permitted thresholds, and drive up the cost of filtering equipment, the space it takes up, and the maintenance burden over time.
Phase-shift multi-pulse rectification tackles this at the source. A phase-shifting rectifier transformer supplies multiple rectifier units with three-phase AC at staggered phase angles. When the resulting current waveforms combine, their harmonic components partially cancel each other out — significantly reducing input current total harmonic distortion (THDi) and cutting resistive heating and additional losses in connected equipment.
A conventional rectifier is like a single team of workers carrying loads on a fixed rhythm — everyone's contributing, but the effort is uneven and the process lurches along. Phase-shift multi-pulse rectification is like running several teams on offset schedules, each filling in the gaps left by the others. Same throughput, smoother operation.
On top of this, CEEG integrates SiC PWM active rectifier modules for precise control over the input current waveform, further reducing harmonic distortion and conversion losses. Under the relevant configuration and test conditions, system THDi is kept below 3% — reducing the need for additional filtering equipment and making grid connection considerably more straightforward.
Faster Charging: Multiple Vehicles, No Power Struggles
Clean grid connection is only the first step. Once the power is on site, the system still has to regulate voltage precisely and distribute power dynamically as vehicles come and go — each with its own requirements.
CEEG's Megawatt Flash Charging Transformer supports both megawatt-class flash charging and conventional fast charging, and can be configured with 1500A liquid-cooled ultra-fast charging guns and 250A air-cooled fast charging guns. Power is allocated dynamically based on each vehicle's actual demand.
High-efficiency DC/DC conversion units handle wide-range voltage regulation across varying vehicle requirements. A multi-layer closed-loop control algorithm coordinates voltage, current, and power output across all active units in real time — putting power where it's needed, improving equipment utilization, and keeping DC conversion losses in check.
From phase-shift multi-pulse rectification and SiC active rectification at the front end, through to high-efficiency DC/DC conversion and closed-loop control at the back end, losses are managed at every stage. Overall station system efficiency reaches up to 96.5%.
Lower Electricity Bills, Faster Returns: What Does the Math Actually Look Like?
Take a 2.5MW station with annual throughput of 12 million kWh. Compared to a conventional system running at 94.5% efficiency, lifting that figure to 96.5% — just two percentage points — cuts annual energy losses by around 240,000 kWh.
At industrial electricity rates of 0.8–1.0 RMB/kWh, that works out to direct annual savings of roughly 190,000–240,000 RMB in electricity costs alone. The larger the station and the longer it runs, the more those gains add up.
Smaller Footprint, Faster Installation: Cutting Through the Complexity
Conventional charging stations involve a lot of separate equipment, a lot of on-site wiring, and a lot of multi-system commissioning. They take up significant space, and any weak link in the coordination process can push back the whole project timeline.
CEEG's Megawatt Flash Charging Transformer integrates the medium-voltage input, phase-shift transformer, active rectifier, DC/DC power conversion modules, and control system into a single prefabricated unit. The bulk of the integration and commissioning work is done at the factory. On site, what remains is foundation preparation, equipment placement, and external cable connections.
Under typical project conditions, this cuts construction time by more than 50% and reduces installation footprint by around 40%. The modular power unit design also allows flexible capacity configuration from the outset, and makes future expansion, fault isolation, and routine maintenance significantly easier.
Four Application Areas
Electric Heavy-Duty Trucks — Less time at the charger means more time on the road. Megawatt-level output and dynamic power distribution reduce queuing and let a given station serve more vehicles with the same infrastructure.
Electric Mining Vehicles — Mining operations run around the clock under demanding conditions. High reliability, strong environmental resilience, and overload capability keep equipment running continuously and unplanned stops to a minimum.
Marine Shore Power — Port windows are short and berth space is tight. Higher charging power and compact system integration allow vessels to complete charging efficiently within limited turnaround schedules.
Public Fast Charging — Public stations deal with a wide mix of vehicle types and voltage requirements. Dynamic power allocation on demand — covering both megawatt flash charging and standard fast charging — ensures different terminals get what they need, improving utilization and overall station throughput.
If you're planning a megawatt charging project for heavy trucks, mining fleets, port facilities, or public charging networks, contact our team for a tailored solution and returns analysis.