基波磁势自平衡串并联混合有源电力滤波器

研究了基波磁势自平衡串并联混合有源电力滤波器.其串联在系统和谐波负载之间的零磁通变流器可自动实现对基波呈现低阻抗,对谐波呈现高阻抗,并可实时方便地检测出剩余谐波电流流过变流器时产生的谐波电压降.通过逆变器产生一个与检测到的谐波电压成正比的谐波电压源,并通过耦合变压器与无源滤波器串联之后再并联接入电网,从而更好地减少流入系统的谐波电流.实验结果证明了结论的正确性.

A practical series-shunt hybrid active power filter based on fundamental magnetic potential self-balance

A novel series-shunt hybrid active power filter based on fundamental magnetic potential self-balance is proposed.The current converter which is connected in series between the power utility and harmonic-producing loads will present low reactance to fundamental and the high impedance to the harmonics automatically.In the same time,the harmonic voltage drop which is produced when the surplus harmonic current flows through the current converter is detected out timely.The active power filter is controlled as a harmonic voltage source which is in proportion to the measured harmonic voltage waveform.Where,the active power filter is connected to the passive filters in series through an isolation transformer.Then the harmonic current that flows into the power system will be less.The validity of the theory and excellent compensation characteristics are verified by an experimental prototype.