GRIDCON® Active Filter
Active harmonic filters for broad band harmonics reduction
Modular active harmonic filters for any application: Our 4-wire active filter is optimized for filtering single-phase loads, and protects against neutral conductor overloads. Common applications are in 208 V and 400 V networks. The 3-wire variant is designed for industrial applications with symmetrical loads and is available with up to 500 A per control cabinet.
Frequency converters for drives or other rectifier loads are used in various industries and cause distortion in the mains voltage, expressed as Total Harmonic Distortion (or THD for short). Since the voltage levels also vary, the area of application of our products goes beyond 400 V: the filters also improve the voltage quality in networks with nominal voltages of 440 V, 480 V, 525 V, 600 or 690 V or reduce harmonics in medium voltage networks via a transformer. Systems with liquid cooling are optionally available.
Your Advantages at a Glance
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Voltage control enables sensorless operation without current transformer, often with better results
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Automatic compliance with permissible harmonic limits according to EN 50160 / IEC 61000 / IEEE 519 standard
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Broadband filtering prevents additional heating of equipment by selectively reducing voltage distortion up to the 51st harmonic
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Flexible - For all voltage levels up to 690V
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High dynamic compensation of reactive power (capacitive and inductive) Harmonics and flicker
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High power density in a small space: Up to 500 A possible in one cabinet and IP 54 protection class
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Modularly expandable and flexibly adaptable to future consumer structures
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Low-loss: Lower power costs through efficient design and 3-level technology
Product Information
Active filters are the established solution for flexibly and safely reducing harmonics. How do they work? You can think of them as a controlled current source. This compensates for disruptions in the network by feeding in a current of exactly the required frequency and amplitude. Alternatively, our active filters can also work sensorless – i.e. without a current transformer – based on a voltage measurement. This voltage control mode makes it possible, in particular, to compensate for network pre-distortion.
The 3-level circuit of GRIDCON® ACF is based on twelve IGBTs, whereas conventional 2-level active filters only comprise of six. The special circuitry halves the voltage load of the power semiconductors. On the one hand this results in lower losses and on the other hand enables use in grids with a higher rated voltage. The DC link voltage is also higher which allows higher peak currents to be generated, which is essential for filtering harmonics with a high bandwidth. Another benefit of the 3-level technology is the lower ripple of the output current compared with the 2-level architecture. The split DC link and the larger number of IGBTs result in an additional third inverter state at the output. This can be used to make the line filter and EMC filter more compact with the same switching frequency and thereby reduce losses.
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Active filters are the established solution for flexibly and safely reducing harmonics. How do they work? You can think of them as a controlled current source. This compensates for disruptions in the network by feeding in a current of exactly the required frequency and amplitude. Alternatively, our active filters can also work sensorless – i.e. without a current transformer – based on a voltage measurement. This voltage control mode makes it possible, in particular, to compensate for network pre-distortion.
The 3-level circuit of GRIDCON® ACF is based on twelve IGBTs, whereas conventional 2-level active filters only comprise of six. The special circuitry halves the voltage load of the power semiconductors. On the one hand this results in lower losses and on the other hand enables use in grids with a higher rated voltage. The DC link voltage is also higher which allows higher peak currents to be generated, which is essential for filtering harmonics with a high bandwidth. Another benefit of the 3-level technology is the lower ripple of the output current compared with the 2-level architecture. The split DC link and the larger number of IGBTs result in an additional third inverter state at the output. This can be used to make the line filter and EMC filter more compact with the same switching frequency and thereby reduce losses.
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