Active harmonic filters optimise power quality
Optimising power quality, the EPCOS PQSine series of active harmonic filters has been introduced by TDK. The filters are designed for 3-phase networks, with and without neutral conductors, at voltages from 200 to 480VAC and 50/60Hz. Capable of analysing and neutralising harmonics up to the 50th order, the filters are available in steps of 60A up to a maximum rated current of 600A.
The core of the filters, which is a controller based on a 32-bit DSP, operates at a scanning rate of 48kHz. With a reaction time of only 21µs, the filters feature selective drive control algorithm, which is faster than conventional algorithms based on a fast Fourier transform. While power factor correction corrects inductive loads, the filters also correct capacitive reactive power loads.
The PQSine series not only filters, but also balances the loads to all phases. Neutral conductor currents can also be corrected using the series' 4-line versions. The filters are offered with either a 7 or 12.1" TFT colour touchscreen, which provides a user-friendly interface for setting parameters and monitoring the operation of the system.
TDK's filters are suitable for frequency converters, UPS systems, photovoltaic systems, wind turbines and also data centres and production equipment in the semiconductor industry. The filters can also be used in office buildings and shopping centres.
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