Abstract
In power line communication (PLC), couplers such as coupling transformers and band-pass matching coupling circuits are usually required for coupling, band-pass filtering, and impedance matching. However, the cost and size of transformers prevent them from being an economic and compact solution for PLC couplers. In addition, passive band-pass matching coupling circuits need accurate impedance matching and possibly incur power losses. In this paper, a 6th order multiple feedback (MFB) active power filter with the minimum number of components was designed for narrow-band PLC, which has high input impedance and low output impedance, allowing outstanding performance in main voltage isolation, suppressing the current-harmonics and compensating the reactive power simultaneously. Finally, simulations were conducted in the range of 95 kHz-125 kHz (CENELEC “B-band”), which confirmed that the new filter met the CENELEC requirements for transmission and disturbance levels.
Highlights
Power line communication (PLC) is one of the most economical solutions to data transmission, as it utilizes existing power lines as the communication medium
Sine supply current and communication signal exist in the same power line channel, the quality and reliability of PLC are always interfered by high-order harmonic or pulse jamming caused by non-linear end electric devices
As a band-pass filter (BPF), PLC coupler is usually required for allowing the communication signal to pass through as much as possible while filtering out band noises and main voltages
Summary
Power line communication (PLC) is one of the most economical solutions to data transmission, as it utilizes existing power lines as the communication medium. Sine supply current and communication signal exist in the same power line channel, the quality and reliability of PLC are always interfered by high-order harmonic or pulse jamming caused by non-linear end electric devices. As a band-pass filter (BPF), PLC coupler is usually required for allowing the communication signal to pass through as much as possible while filtering out band noises and main voltages. The coupling transformer and band-pass matching coupling circuits are two typical kinds of PLC couplers. For overcoming these problems an active power filter was designed for suppressing the current-harmonics and compensating the reactive power simultaneously. It should be noted that the new active filter design focuses on the CENELEC B band (95 kHz-125 kHz) as an example, the same principles will hold for any of the CENELEC bands
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