Basically the series APF performs the isolation work by presenting very high impedance for the harmonics. It introduces a compensating voltage in series with that of source, having same magnitude but in phase opposition to that of harmonic components and thus cancels the voltage harmonics. Fig. 2 shows the basic topology of a series APF. Similar to shunt APF, it also consists of a VSC with a PWM controller and a control strategy for generating reference signal for the compensating voltage, which is then processed by PWM controller for the switching of VSC. These series APFs can be used in systems that supply power to the voltage sensitive devices, requiring a pure sinusoidal voltage source.
Author(s) Details:
Md. Ehtesham,
Department of Electrical & Electronics, Maulana Azad National Urdu University, Cuttack Campus, India.
Mohmmad Ahmad,
Department of Electrical Engineering, Rajkiya Engineering College, Bijnor, India.