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Active filter for high-power nonlinear loads

For high power nonlinear loads, the existing active filter topologies are not effective due to their large rating and high switching frequency requirement of inverter. In order to solve the problem, the authors propose a novel hybrid parallel active filter (HPAF) for high power nonlinear loads. Individual small rated inverters are designed for dominant harmonics. The bandwidth requirement of the inverter is reduced so the inverter can work at lower switching frequency. Inverters are connected in parallel with the passive filter inductors. The passive filter can operate by itself if the inverter is in the high impedance mode. Because the significant portion of fundamental and harmonic components flows through the passive filter inductor, the current loading to the inverter is reduced greatly. A single harmonic detection method based on i p i q theory is also proposed. Judging from the computer simulation by Matlab, the proposed HPAF has the same filter characteristics as the existing HPAF, but the inverter current of the proposed HPAF is about 50% of the inverter current of the existing HPAF.