AHF / SVG
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AHF / SVG
Active Harmonic Filter (AHF) and Static Var Generator (SVG) are IGBT-based power electronics devices that solve the two biggest power quality problems in modern electrical systems — harmonic distortion and reactive power imbalance. The AHF continuously monitors load current, detects harmonic distortion, and injects a compensating current of equal magnitude but opposite phase to cancel harmonics in real time. The SVG detects phase angle difference and injects leading or lagging current into the grid, making the fundamental power factor unity. Together they deliver complete power quality correction — harmonic mitigation, dynamic reactive compensation, three-phase load balancing and neutral current reduction.
- Response Time: <10ms
- Efficiency: >97%
- Harmonics Filtered: 2nd to 50th
- Power Factor: Up to 0.99
- Modular Capacity: 30A to 600A
- Communication: Modbus RTU / TCP
Two Technologies, One Goal — Clean Power
AHF and SVG are complementary devices. Used together, they deliver complete power quality correction for the most demanding industrial and commercial installations.
Active Harmonic Filter (AHF)
The AHF uses a three-level neutral clamping (NPC) topology with IGBTs to actively inject a compensating current that cancels harmonics generated by non-linear loads such as VFDs, UPS systems, rectifiers, computers and LED lighting. It continuously measures load current and dynamically filters harmonics from the 2nd to the 50th order, reducing THDi to below 5% and ensuring compliance with IEEE-519 and IEC-61000-3.
Static Var Generator (SVG)
The SVG works as a controlled current source that provides any type of current waveform in real time. When the load generates inductive or capacitive current, it makes the load current lag or lead the voltage. The SVG detects the phase angle difference and injects leading or lagging current into the power system, making the phase angle of current almost the same as that of voltage on the transformer side — achieving near-unity power factor. It also corrects load imbalance and mitigates neutral current.
AHF — Specification
Complete technical parameters of the Active Harmonic Filter.
Active Harmonic Filter — Technical Specification
| Rated Voltage | 200V / 400V / 480V / 690V – 50/60Hz |
| Input Voltage Range | ±20% of rated voltage |
| Current Rating | 30A to 600A (modular/scalable) |
| Filtering Range | 2nd to 50th harmonic (selectable per order) |
| Harmonic Elimination Rate | >95% (THDi <5% achievable) |
| Response Time | <10ms (overall), <50µs (reaction) |
| Efficiency | >97% |
| Target Power Factor | Adjustable from -1 to +1 |
| Switching Frequency | Average 40kHz, up to 95kHz |
| Cooling | Forced air, 93–310 CFM depending on rating |
| Noise Level | <60dB (full load) |
| Operating Temperature | -30°C to 40°C (derate above 40°C) |
| Relative Humidity | 5% to 95%, non-condensing |
| Wiring Types | 3P3W / 3P4W compatible |
| Communication | Modbus RTU / TCP, RS-485, Ethernet |
| Compliance | IEEE-519 / IEC-61000-3 |
SVG — Specification
Complete technical parameters of the Static Var Generator.
Static Var Generator — Technical Specification
| Rated Compensation Capacity | 5 kVAR to 100 kVAR per module |
| Nominal Voltage | 220V / 400V / 500V / 690V (±20%) |
| Rated Frequency | 50/60Hz ±5% |
| Grid Structure | Single phase / 3P3W / 3P4W |
| Reactive Power Compensation | >99% — step-less, bi-directional (capacitive & inductive) |
| Power Factor Range | -0.99 ≤ Cosφ ≤ 0.99 |
| Harmonic Compensation | 2nd to 25th order (selectable), up to 20% of rated current |
| Imbalance Correction | Negative and zero sequence, neutral current mitigation |
| Response Time | <10ms |
| Machine Efficiency | >97% |
| Switching Frequency | 12.8kHz to 32kHz (depending on voltage class) |
| Noise Level | <50dB to <65dB (depending on rating) |
| Communication | Two-channel RS485 (GPRS/WiFi optional) |
| Monitoring | 4.3" LCD / 7" centralized monitoring screen |
| Cooling | Forced air / natural cooling |
| Altitude | ≤2000 metres |
| Ambient Temperature | -20°C to +50°C |
| Relative Humidity | <90%, non-condensing |
| Protection Grade | IP20 (higher grades available) |
Why Choose Our AHF / SVG Solution?
Engineered for reliability, efficiency and long-term performance in the most demanding electrical environments.
Real-Time Compensation
Response time under 10ms ensures harmonics and reactive power are corrected instantly, even with rapidly fluctuating loads.
Modular & Scalable
Modules from 30A to 600A can be paralleled up to 4000A. Add capacity as your plant grows without replacing existing equipment.
Bi-Directional Compensation
Corrects both inductive and capacitive reactive power, maintaining power factor close to unity across all load conditions.
Comprehensive Protection
Overload, over-current, over-voltage, over-temperature, short-circuit and resonance protection with automatic fault logging.
Advanced Monitoring
On-board HMI displays voltage, current, power factor, harmonics, waveform and event history. Remote monitoring via Modbus.
Energy Savings
Reduces transformer losses, cable heating and equipment downtime — lowering operating costs and carbon emissions.
Industries & Applications We Serve
AHF and SVG solutions are deployed across a wide range of industries where power quality directly impacts productivity and equipment life.
AHF / SVG — Complete Power Quality Solution
- Active Harmonic Filter (AHF) eliminates harmonics from the 2nd to the 50th order, reducing THDi to below 5% and ensuring compliance with IEEE-519 and IEC-61000-3.
- Static Var Generator (SVG) provides dynamic, step-less and bi-directional reactive power compensation, maintaining power factor between -0.99 and +0.99.
- Both devices use IGBT-based three-level NPC topology for low losses, high efficiency (>97%) and compact footprint.
- Modular design allows paralleling of up to 20 modules for a single AHF system and up to 10 cabinets for SVG, scaling capacity to 4000A+.
- Integrated HMI displays voltage, current, power factor, harmonics, waveform and event history for complete system visibility.
- Communication options include Modbus RTU/TCP, RS-485, Ethernet, and optional GPRS/WiFi for remote monitoring.
- Suitable for industrial, commercial, infrastructure and renewable energy applications where power quality directly impacts reliability and operating cost.
Poor power quality is one of the most overlooked causes of equipment failure, energy waste and production downtime in modern facilities. Harmonics from variable frequency drives, UPS systems and LED lighting overheat transformers, age cable insulation and cause capacitor banks to fail prematurely. Reactive power drags down the power factor, attracting utility penalties and reducing the usable capacity of transformers and cables. Three-phase imbalance further reduces transformer capacity and increases neutral current.
Our AHF and SVG solutions address all of these problems simultaneously. The AHF actively cancels harmonics in real time, the SVG corrects reactive power and load imbalance dynamically, and together they restore the quality of power at the point of use — protecting equipment, reducing energy costs and ensuring compliance with grid requirements.
Need Help Selecting the Right Power Quality Solution?
Share your load details, harmonic profile and power factor requirements — our team will recommend the most suitable AHF and SVG combination for your application.