In Active Harmonic Filter (AHF), the function of an Insulated Gate Bipolar Transistor (IGBT) is to control the compensation currents that are generated to counteract the harmonic currents in an electrical power system. IGBTs are used as the main switching devices in AHFs due to their ability to handle high voltages and currents. Here's a step-by-step explanation of how IGBTs function in an Active ...