EV Charging Station 75A 400V Active Harmonic Filter AHF Wall Unit for DC Fast Charger Loads

ND-AHF-75-400-W is a wall mounted unit rated 75 A at 400 V AC (3P4W) built for EV charging stations. It removes harmonic current at the point where the non-linear load connects, so the distortion stops at the source instead of spreading through upstream switchgear, transformers and generators.

Wall mounting keeps the filter inside the existing charging cabinet room, so no additional electrical room or floor area is needed at the site.

The unit measures the load current continuously and injects an equal and opposite compensation current, so the grid current returns to a near sinusoidal shape while the load keeps running unchanged. Reactive power compensation and three-phase unbalance correction can be enabled on the same hardware, which means one Active Harmonic Filter AHF can replace a combination of capacitor banks, detuned reactors and balancing equipment.

Main technical characteristics of this 75 A 400 V Active Harmonic Filter AHF:

• Rack, Wall and Cabinet Options
  One power platform is offered as a 19-inch rack module, a wall unit or a floor-standing cabinet.
• PWM Speed-Controlled Fan Cooling
  Fan speed follows the output current instead of running at a fixed speed, cutting auxiliary consumption and airborne noise.
• Selectable Compensation Modes
  Harmonic filtering, reactive power compensation and three-phase balancing can be enabled separately or together from one menu.
• Residual THDi Below 5%
  After compensation the grid current distortion is normally held under 5%, in line with IEEE 519 and GB/T 14549 recommendations.
• Low Auxiliary Power Loss
  Auxiliary consumption stays a small fraction of rated current, so the unit does not become a new heat source in the room.
• Complete Internal Protection Chain
  Over-voltage, under-voltage, over-current, over-temperature, phase-loss and short-circuit protection act without external relays.
• Adaptive ADALINE Self-Learning Control
  The controller learns the real grid and load impedance on site, so commissioning finishes without hand-tuning a parameter list for every installation.
• Front-Access Service Design
  Terminals, fans and modules are reachable from the front, so maintenance does not need side clearance.

This Active Harmonic Filter AHF is normally installed on the following loads:

• DC fast charger groups up to 240 kW
• Fuel station forecourt charging
• Municipal charging plazas
• Bus depot overnight charging
• Charging cabinets inside existing electrical rooms

Reasons buyers select our Active Harmonic Filter AHF for projects in EV charging stations:

• Selection and Survey Support
  Our engineers review your harmonic measurement, calculate the required compensation current and issue a written selection report before you place an order.
• Project-Specific Engineering
  Capacity, voltage class, CT ratio, cabinet colour and communication protocol are configured against your single line diagram instead of being taken from a catalogue page.
• Response within 24 Working Hours
  Technical and commercial questions are answered within one working day, and remote commissioning runs over video call, email or WhatsApp.
• Manufacturer Scope
  We are a Shanghai based power quality manufacturer with our own R and D labs, production workshops and a full-function test bay, so the algorithms, firmware, hardware and cabinet structure are all developed in house.
• Spare Parts after Warranty
  Fans, control boards, CTs and power modules remain available at reasonable cost once the warranty period ends.

Typical configuration of model ND-AHF-75-400-W. Voltage class, current rating, CT ratio and enclosure can be adapted to your single line diagram.

Common questions about this Active Harmonic Filter AHF from project engineers and distributors:

Nengdu New Energy is a Shanghai based high-tech manufacturer focused on integrated research, production, sales and after-sales service of power quality improvement equipment. The product line covers AHF active filters, SVG static var generators, intelligent capacitors, reactive power controllers, capacitor contactors, voltage adjusters, smart composite switches, dynamic reactive regulators and matching energy storage systems.

Standardised production workshops, dedicated R and D laboratories and a full-function testing workshop support in-house development of every algorithm, software, hardware platform and cabinet structure. Customised power equipment and complete turnkey solutions are supplied, and ODM cooperation is available for partners who need their own branding.

Products hold CE, IEC, RoHS and ISO certification. Long-term partnerships with energy engineering distributors span Southeast Asia, the Middle East, Europe, America and Africa, with core cooperation in India, Germany and Saudi Arabia. Our engineering team provides on-site power quality testing and calculation, equipment replacement matching, programming and commissioning guidance, plus permanent remote after-sales assistance.

• Technical Support
  Lifetime free remote technical support for commissioning, troubleshooting and parameter configuration by video call, WhatsApp or email.
• Training Materials
  Complete operation manuals, wiring diagrams and parameter explanations are supplied so your engineers can run the unit independently.
• On-Site Service
  Where overseas on-site commissioning is required, engineers can be dispatched abroad; travel and service fees are quoted separately.
• Warranty
  A limited warranty applies, with the specific period and terms confirmed in the project contract.
• Response Time
  After-sales and technical enquiries are answered within 24 working hours.
• Spare Parts Supply
  After the warranty period, spare parts are supplied at reasonable cost for the full service life of the equipment.

Send us your single line diagram, harmonic measurement or load list, and our engineers will calculate the required compensation current and confirm the matching Active Harmonic Filter AHF model for your site. Typical response time is within 24 working hours.