Three-Phase Four-Leg Four-Wire Topology in High Power Factor Converter addressing the problem of unbalanced source currents

Unbalanced voltage supplies, load and nonlinear loads leads to poor Total Harmonic Distortion (THD), generates reactive power and excess neutral current leads to degradation of power quality. To mitigate these issues three phase three leg four wire (3P3L4W) topology with Synchronous Reference Frame (SRF) based Zero Current Injection (ZCI) algorithm is implemented to balance the dc link capacitor voltage, improve THD and reduce unbalanced supply voltage condition. But source currents are not sinusoidal to overcome this limitation a three phase four-leg four wire (3P4L4W) diode clamped converter (DCC) is proposed, which is discussed in detail in this paper with simulation results using MATLAB/Simulink environment.