Schematic
Description
Power filter through external current transformer CT, real-time detection of load current, and by the internal DSP calculated to extract the load current harmonic components, and then through the PWM signal sent to the internal IGBT, inverter control and the load harmonic current to generate a equal and opposite compensating current injected into the grid harmonic current, the filtering function.
Applications
Active power filter is widely used in communications, electric iron rail transportation, electricity, large equipment manufacturing plants, computer centers, tobacco, banking, medical, metallurgical, petrochemical, electronics, paper, construction industries.
Technological advantages
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Meanwhile 2 - 50 harmonics filtering, or choose to filter out the specified number of harmonics |
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Response time of less than 1ms, the harmonics of the step change time of less than full compensation for 10ms (1 / 2 cycle) |
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3DSP + CPLD using digital control and international famous brand high-speed IGBT, closed-loop control, precise harmonic filter |
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Automatically eliminate resonance, impedance and system impedance from power change |
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With harmonic compensation; both harmonic and reactive power compensation; compensation for harmonic and compensate reactive power and unbalanced three-phase current mode |
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Parallel installation, easy installation is simple, easy to expand |
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Design selection is simple, just the size of the harmonic current measurement system |
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Easy to maintain, in line with the requirements of working environment, no maintenance of non-mechanical failures |
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Flexible wall and rack mounting |
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Standard installation, easy expansion, low loss |
Selection Help:
For three-phase three-wire or three-phase four-wire system, the effective harmonic filtering
phase measurement data to determine compensation by current, or through the power system details (single figure, transformers, load, etc.) to calculate the compensation current Only three-wire system configuration 2 CT (for the A phase and B phase); four-wire system will need to configure three CT (for the A phase, B phase and C phase)
