Control method of series mixed active power filter having base wave by-pass channel

Series with fundamental bypass channel mixing active power filter control method, regardless of the power grid and to solve load balancing or not, connected in series with the control bypass passage fundamental hybrid inverter is not active power filter fundamental current flows, avoiding the bypass passage and the inverter fundamental resonance occurs while suppressing the harmonics, thereby reducing the cost of the inverter and machine capacity, improve inverter efficiency. Technical characteristics of the control method of the present invention is to apply the full fundamental current detection method: i.e. fundamental current detection method based reverse dq conversion or rotating twin fundamental current detection method based cascaded dual dq transformation or by-based fundamental current phase detection method based dq transformation or fundamental current detecting method by phase bandpass filter. The techniques of this invention is applicable to both the three-phase three-wire system is also applicable to a three-phase four-wire system.