Active Power Filter APF is connected in parallel with non-linear loads, and uses one set of CT to detect the load current. It calculates each order harmonic current by FFT algorithms in its DSP microchips, and then generates a compensating current with the same amplitude but opposite phase angles to the detected harmonic current, which cancels out the original load harmonics.APF not only eliminates harmonic current from the load side, but it also mitigates harmonic voltage caused by harmonic currents. The APF system can also improve power factor (PF) and correct load imbalances in the power system.
Overview of APF
ZDDQ Active Power Filter(APF for short) is a perfect comprehensive solution to power quality problems with power grid such as harmonic wave(can filter 2nd to 50th harmonic interference completely), reactive power, and 3 phase load unbalance.
Active Power Filter is connected in parallel in power grid, to detect the harmonic wave in power grid in real time, generate the reverse-phase compensation current through the converter, and dynamically filter the harmonic wave in power grid. The operation of APF is unaffected by power grid structure and load type, and it will not produce harmonic oscillation with the system, thus perfectly realizing harmonic wave control of various loads.
Active Power Filter can also realize dynamic reactive compensation, and control the capacitor switching, to improve the power factor of power grid. Meanwhile, APF has the function of controlling the 3 phase load current unbalance, thus comprehensively solving various power quality problems with power grid.
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| Active Power Filter module | Rack type Active Power Filter panel |
Technical Specification
| Rated Voltage | AC 308V-480V |
| Electric Connection | 3P3W/3P4W |
| Rated Frequency | 50Hz (60Hz) +/- 10% |
| Rated Current per Module | 30Amp,50Amp, 75Amp, 100Amp,150Amp |
| Rated Current per Cabinet | 30~600Amp (module combination) |
| Redundancy | Each module is an independent filtering system |
| Harmonic Elimination Range | 2nd ~ 50th order (Selectable) |
| Compensation Mode | Compensate Harmonics,Reactive Power,Phase imbalance |
| Harmonic Filtering Performance | Filter up to 98% harmonics at rated load |
| THDv/THDi | THDv<3%, THDi<5% after filtering |
| Reactive Power Compensation Capability | Both inductive and capacitive reactive power compensation |
| Imbalance Correction Capability | Mitigate negative and zero sequence |
| Full Response time | <5ms |
| Instant Response time | <100us |
| Thermal Loss | ≤3% of AHF rated capacity (kVA) |
Email us hanson@chinazddq.com,or click Active Power Filter Datasheet to download details.
APF principles
Active Power Filter is connected in parallel with non-linear loads, and uses one set of current transformers (CT) to detect the load current. It calculates each order harmonic current , and then generates a compensating current with the same amplitude but opposite phase angles to the detected harmonic current, which cancels out the original load harmonics.
The APF not only eliminates harmonic current from the load side, but it also mitigates harmonic voltage caused by harmonic currents. The APF system can also improve power factor (PF) and correct load imbalances in the power system.
Active Power FIlter Principle
Active Power Filter Interface
APF Benefits
■Ultra-fast reactive power compensation(Inductive and capacitive).
■Harmonic Compensation up to 50th harmonic(Individual selectable).
■Load balancing between phases and unloaded neutral wire.
■Flicker compensation.
■Reduce overheating/Redue nuisance tripping/Reduce overloading/ Reduce equipment failure.
■Improve Reliability.
■Compact Design and Modular system.
■Grid resonance detection.
■User-friendly HMI menu operation.
■Ethernet and ethercat system for interconnection.
■High performance and reliability.
■Insensitive to network/grid condisitons.
■Simple installation.
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APF SVG R&D Team |
APF SVG aging and reliability Test |
APF application
■Industrial installations with a set of non-linear loads representing more than 500kVA (variable-speed drives, UPSs, rectifiers, etc.)
■Installations requiring power-factor correction.
■Installations where voltage distortion must be reduced to avoid disturbing sensitive loads
■Installations where current distortion must be reduced to avoid overloads
Following are typical application industries of Active Power Filter.
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