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In this paper, a single-phase ac-dc converter is proposed. It is composed of N single-phase boost rectifiers in a parallel connection scheme. The proposed topology permits to reduce: the current and consequently the power ratings of the switches and the switching stress in dc-link capacitor. Also, it is proposed a PWM strategy, which allows reducing the THD of the grid current when compared to the...
In this paper, an optimal design method of three-phase rectifier with near-sinusoidal input currents (RNSIC) is proposed. By using the proposed method, high power factor could be achieved as well as low input current harmonics, making the converter more practical. Moreover, based on the operation principle analysis of RNSIC, characteristic of the rectifier is discussed. Experimental results form three...
In this paper is studied the single-phase two-cell multilevel cascade H-bridge power converter connected to the grid, acting as a synchronous rectifier. The power exchange process between the cells of the converter and the grid is analyzed. Based on this analysis and on the power converter model the stages of the controller design process are shown. A new controller for the cascade power converter...
Conventional Single-Stage Power-Factor-Correction (PFC) AC/DC converter has a link capacitor voltage problem at high line input and low load condition. In this paper, this problem is analyzed by using voltage conversion ratio of the DC/DC conversion cell. By applying this analysis, A new Single-Stage PFC AC/DC converter with boost PFC cell is integrated with Voltage-Doubler Rectified Asymmetrical...
A three phase six pulse controlled bridge rectifier with adjustable value of injection third harmonic current is used to control DC drive. In order to improve the power quality of both AC and DC sides of the system the injection circuit parameters have to be varied according to drive loading operating conditions. Therefore the values of injection circuit parameters depend on the firing angle (alpha)...
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