Power factor adjustment and input current distortion mitigation for three‐phase unidirectional rectifier

Abstract

In order to improve the power quality, many researchers in the worldwide are committed to investigating the feasibility of integrating reactive power compensation (RPC) and harmonic current compensation (HCC) functionalities for unidirectional rectifier, while the capability of RPC for unidirectional rectifier is very limited. Hence, with the aim of enlarging the capability of RPC for unidirectional rectifier, this article introduces a versatile control strategy for three-phase star-connected unidirectional rectifier. The operating principle and the reasons that limit the capability of RPC for unidirectional rectifier are analysed in detail. On this basis, a novel criterion for judging input current distortion zone is proposed. Furthermore, the additional focus of this article is to quantify the constraint relationship between the degree of input current distortion compensation and input power factor regulating range. Simulations and experimental results are conducted to verify the feasibility and effectiveness of the proposed control strategy, as well as the correctness of the theoretical analysis on the proposed constraints of the input power factor regulation.

Evaluation and Comprehensive Comparison of H-Bridge-Based Bidirectional Rectifier and Unidirectional Rectifiers

“…The results show that each of the topologies possesses several advantages and disadvantages. Although the bidirectional rectifier exhibits the characteristic of low THD input current, and those types of topologies are appropriate for the However, in order to improve the THD performance for the unidirectional topologies, the control methods have been modified to decrease the distortion of the input current, and to increase the controllability angle [28][29][30].…”

“…The distortions of the input current will become more severe while the leading or lagging angle is increased, so the controllability angle for unidirectional rectifier is limited. However, in order to improve the THD performance for the unidirectional topologies, the control methods have been modified to decrease the distortion of the input current, and to increase the controllability angle [28][29][30].…”