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The active power filter operates on the principle of real-time load current detection, individually isolating harmonic currents using a specified algorithm. It generates a control signal based on the filtering percentage to drive the IGBT output in phase with the load harmonic current amplitude, achieving harmonic cancellation through opposite compensation currents.
Here's how they exert their influence:
1. Current and Voltage Monitoring: Initially, the active harmonic filter gauges the current and voltage at the grid connection point. This data is pivotal for assessing the harmonic content and power factor of the load.
2. Harmonic Identification: The filter scrutinizes the gathered data to pinpoint the specific harmonic frequencies within the system. This step is essential as different harmonics necessitate distinct corrective measures.
3. Counteractive Harmonic Generation: Once the harmonics are recognized, the active harmonic filter generates counteractive harmonic currents. These currents are precisely configured to be out of phase with the problematic harmonics. Consequently, they effectively nullify the unwanted distortions, restoring the waveform to its desired sinusoidal form.
4. Real-Time Adjustment: This corrective process is ongoing, adapting swiftly to fluctuations in loads and harmonics in real time. Serving as a vigilant overseer, the active harmonic filter flexibly adapts to the evolving demands of the electrical system.
5. Enhanced Power Factor: Beyond addressing harmonics, active harmonic filters contribute to enhancing the power factor. This ensures the efficient utilization of electrical energy and mitigates penalties imposed by utilities for inadequate power factor.
Petrochemical industry, data center, hospital industry, pharmaceutical manufacturing, steel industry, semiconductor manufacturing, light industry and textile industry, etc.
TYPE | Series 220V | Series 400V | Series 500V | Series 690V |
Max neutral wire current | 23A | 15A 、25A 、50A、 75A 、100A 、150A | 100A | 100A |
Nominal voltage | AC220V(-20%~+20%) | AC380V(-20%~+20%) | AC500V(-20%~+20%) | AC690V(-20%~+20%) |
Rated frequency | 50Hz±5% | |||
Network | Single phase | Three-phase three-wire/three-phase four-wire | ||
Response time | <40ms | |||
Harmonics filtering | 2th to 50th Harmonics,The number of compensation can be selected, and the range of single compensation can be adjusted | |||
Harmonic compensation rate | >92% | |||
Neutral line filtering capability | / | The filtering capacity of three-phase four-wire neutral line is 3 times of that of phase filtering | ||
machine efficiency | >97% | |||
Switching frequency | 32kHz | 16kHz | 12.8kHz | 12 .8kHz |
Feature selection | Deal with harmonics/Deal with harmonics and reactive power | Deal with harmonics/Deal with harmonics and reactive power/ Deal with harmonics and three-phase unbalance /Three options | ||
Numbers in parallel | No limitation. A single centralized monitoring module can be equipped with up to 8 power modules | |||
Communication methods | Two-channel RS485 communication interface (support GPRS/WIFI wireless communication) | |||
Altitude without derating | <2000m | |||
Temperature | -20~+50°C | |||
Humidity | <90% RH,The average monthly minimum temperature is 25℃ without condensation on the surface | |||
Pollution level | Below level Ⅲ | |||
Protection function | Overload protection, hardware over-current protection, over-voltage protection, power failure | |||
Noise | <50dB | <60dB | <65dB | |
Installation | Rack/wall hanging | Rack | ||
Into the way of line | Back entry (rack type), top entry (wall-mounted) | Top entry | ||
Protection grade | IP20 | |||