Hybrid Active Filter
◆ Three-level technology, high power density
◆ Supports three compensation modes: harmonics, reactive power, and imbalance
◆ FPGA + ARM architecture, fast computing speed, and smarter interfaces
◆ Standard rack size, easy to install in various industry-standard cabinets
◆ Unique patented technology, completely independent air ducting, eliminating any PCBAs or electronic components
Products Description
Hybrid active filter, a new generation of fully digital harmonic elimination devices independently developed and launched by our company, offer distinct advantages over traditional technologies: faster, smaller, more powerful, and easy to install, maintain, and debug, they can easily resolve power quality issues.
Hybrid active filters utilize power electronics technology. The main circuit includes: circuit breakers, fast-acting fuses, surge protectors, main contactors, snubber contactors, grid-connected inductors, LC filters, converters, and DC energy storage capacitors.
The control system of the active haromonic filter incorporates a DSP+FPGA, command current calculation circuits, and current tracking control circuits to enable parameter setting and control command acquisition. The power harmonic filer uses a current transformer to detect the load current. A data processing chip converts the analog signal into a digital signal, which is then sent to the internal DSP. Through algorithmic processing, the signal is extracted from the harmonic components of the load current. The control system then issues a command signal, which uses SVPWM control as a drive signal to control the internal IGBTs. This instructs the inverter to generate a harmonic current equal in magnitude and opposite in direction to the load harmonic current, which is then injected into the grid to filter out the harmonics.
Data Sheet
| Electrical parameters | |
| Wiring method | Three-phase three-wire, three-phase four-wire |
| Operating voltage | 380V(±20%) |
| Operating frequency | 50/60Hz, ±10% |
| Product specifications | 50,75,100A,150A,200A |
| Current transformer specifications | 50:5 ~ 30000:5 |
| Noise | ＜65dB |
| Features | |
| Switching devices | IGBT |
| Switching frequency | >20kHz |
| Heat dissipation methods | Intelligent air cooling |
| Heat dissipation control | Adaptive fan speed adjustment |
| Protection functions | Overvoltage, undervoltage, overheating, overcurrent, short circuit protection |
| Compensation performance | |
| Harmonic filtering rate | ＞95% |
| Active power loss | ＜3% |
| Harmonic filtering range | Harmonics from 2nd to 50th can be individually controlled and configured. |
| Total response time | ＜10ms |
| Resonance suppression | Active inhibition |
| Display Interface | |
| Display screen | 7-foot full-color touchscreen (cabinet type) |
| Language | Chinese, English, and customizable languages |
| Battery display | Distortion rate, power factor, power, voltage, current, and other data display |
| Communication interface and protocol type | RS485, Modbus protocol |
| Environmental conditions | |
| Operating temperature | -10℃~+40℃ |
| Relative humidity | <95%, no condensation |
| Altitude | <5000 meters (above 1000 meters, capacity decreases by 1% for every additional 100 meters) |
| Others | |
| Protection level | IP20 rating, other ratings available upon request. |
| Installation method | Rack-mount, wall-mount, integrated cabinet configurations. |
Q&A
1. Why does an active harmonic filter (AHS-C) use a 3-level NPC inverter topology?
An AHS-C uses an advanced three-level NPC topology, superior to the traditional two-level design. It offers faster response and better harmonic filtering, while reducing heat loss, minimizing component size, and increasing power density. The three-level design also produces a cleaner output waveform, reducing ripple and noise, thus ensuring more efficient and reliable performance.
2. What are harmonics?
Periodic non-sinusoidal currents or voltages in a power system can be decomposed into a superposition of a sine wave with a frequency equal to its fundamental frequency and several sine waves with frequencies that are integer multiples of the fundamental frequency. The portion with frequencies equal to the original waveform is called the fundamental wave, while the portions with frequencies that are integer multiples of the original waveform are called harmonics, and the multiples of the frequencies are the harmonic orders. The vast majority of harmonics in a power system are odd harmonics.
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