Improved DC bus utilization of DVR based on repetitive controller with THIPWM technique

Abstract

A DVR is being used to minimize the power quality problem. The SPWM method has been popularly used in DVR but use of the DC bus is restricted in SPWM, which is critical due to economical as well as power packaging density improvements. The proposed THIPWM scheme has been deduced from SPWM by adding one-sixth of the third harmonic signal in the fundamental signal. Repetitive Controller (RC) with Third Harmonic Injection (THI) technique is applied to achieve better dc-link utilization for medium-low voltage distribution. As an outcome, it's indeed evident that 15% reflects an increment in dc bus utilization as well as the potential to create high voltage AC. The control system comprises a feed-forward as well as feedback run to enhance the transient response & confirm the steady zero error. THD results improve when the THIPWM methodology is being used. PSCAD software is being used for the computation, which generated accurate findings for the THIPWM and Repetitive Control systems approach.