Series Connected Active Multipulse Rectifiers for Harmonics Mitigation

Most of the electronic devices used in recent times for various purposes are non-linear type. Hence they produce harmonics which can cause various problems in our modern power system. This research article proposed two active or controlled multipulse AC to DC converters for limiting total harmonics distortion or THD of input AC signal within a standard value. The designed 18-pulse active rectifier shows an input current THD of 8.80% which is very less compared to an 18-pulse passive or uncontrolled rectifier. Proposed another active rectifier i.e. 24-pulse rectifier shows 4.69% of THD of input AC current which can meet IEEE 519 standard requirement for harmonics limitation. Furthermore both of the rectifiers reaches steady state at DC side within a very short time. This also confirms better output power quality of the both designed schemes.