Single-phase Uncontrolled Rectifiers Research Articles

An Appropriate Index to Assess the Global Cancellation Level of the Harmonic Currents Consumed by a Set of Single-Phase Uncontrolled Rectifiers and a Set of Fluorescent Lamps

An in-depth study of harmonic current reduction in European commercial buildings due to the harmonic cancellation effect when a set of single-phase uncontrolled rectifiers and a set of fluorescent lamps are connected at the same voltage level is essential, since both types of non-linear loads are very present in commercial and residential sectors. This paper provides an appropriate index to assess the global cancellation level of the harmonic currents for this study. The equivalent circuit per phase of the typical three-phase power system of European commercial installations is presented and simplified for the cancellation analysis of the harmonic currents consumed by a set of multiple identical single-phase uncontrolled rectifiers and a set of multiple identical fluorescent lamps connected at the same voltage level. The suitability and usefulness of the proposed index are shown by applying it to that analysis, which leads to some results of practical interest. This index can be generalized to any number of sets of multiple identical non-linear loads and can be applied in graphical and optimization studies that will allow a greater benefit from the harmonic cancellation effect to be obtained given the global nature of the index.

The Harmonically Coupled Admittance Matrix of the Single-Phase Diode Rectifier

The convergence of the iterative harmonic analysis (IHA) of networks with nonlinear loads can be improved if the Gauss algorithm is replaced by the modular decoupled Newton solution (M-DNS). The core of the M-DNS is the harmonically coupled admittance matrix (HCAM) of each nonlinear load. HCAM of high-power converters has received special attention. However, the HCAM of single-phase uncontrolled rectifiers (SPUR) with capacitive smoothing has only been developed under certain simplifications for the SPUR. A reference model for the SPUR is extensively accepted and a detailed analytical procedure (DAP) is the fastest way to obtain the steady state of the SPUR. The main object of this paper is to present a HCAM for the reference model of SPUR with capacitive smoothing. This HCAM is directly derived from a DAP for the converter. Convergence properties of the IHA with this HCAM are studied.

Unjuk Kerja Filter Pasif dalam Mereduksi Distorsi Gelombang pada AC/DC Konverter

This paper shows the use of passive filters to reduce the distortion of input waves in a single phase uncontrolled rectifier. Simulations are carried out with various passive filter models to get a decrease in the value of Total Harmonic Distortion (THD) and correct the distortion of the uncontrolled single phase rectifier input waveform. The results of the simulation show the shape of the input signal changes in the uncontrolled single-phase rectifier, analyzing the value of power factor improvement and also the THD value.

Parameter Estimation Procedure for Models of Single-Phase Uncontrolled Rectifiers

Low-power single-phase loads using single-phase uncontrolled rectifiers with dc-smoothing capacitors as their power supply are increasingly present in low-voltage distribution systems, causing high-voltage distortions. This paper studies the estimation procedure of single-phase rectifier parameters and presents an estimation algorithm based on a rectifier model and actual measurements. The model and the estimation procedure are described and validated with measurements in the laboratory and household installations, respectively.

Behaviour of single‐phase full‐wave rectifier

AbstractThis paper describes the line side behaviour of single‐phase uncontrolled rectifiers with AC‐side reactance and capacitive load, depending on the short‐circuit ratio at the valve side of the rectifier. The influence of both finite DC link capacitance and AC ohmic resistance is considered in the analysis too. As a result of the study, a set of graphics was generated. This allows a user‐friendly estimation of the line current consumed by the device (fundamental and harmonic currents).