Three Phase Rectifier Topology with Practically Sinusoidal Input Currents (original) (raw)

Harmonics Analysis of Input Current of 3-Phase PWM Rectifier

Andalas Journal of Electrical and Electronic Engineering Technology, 2021

Rectifier is a non-linier load that causes harmonic distortion in the power system. Pulse-width modulation (PWM) method is an effective method in pressing the magnitude of harmonics in a rectifier application, it provides an almost sinusoidal input current. However, the variation of loads that supplied by a rectifier cause the harmonics that arise can still beyond the applicable standard. The amount of harmonics in the operating range of a rectifier need to be identified to determine the filter on the input side. In this research article, 3-phase PWM rectifier was designed with hysteresis current control technique using PSCAD software simulation. Harmonic compensation was carried out by applying an active filter based on P-Q theory to reduce the harmonic distortion that occurs in the input current, thus giving a low total harmonic distortion (THD) value. Based on the simulation, 3-phase PWM rectifier operation starting at a power level of 150 kW, giving a THD value above 5-10% by t...

Three-phase rectifiers with suboptimal current injection and improved efficiency

IET Power Electronics, 2014

Three-phase diode bridge rectifiers that apply suboptimal current injection and active resistance emulation are analysed. Two types of current injection devices (CIDs) are in the focus, and rectifiers with each CID are analysed for two cases of active resistance emulation: one that applies low-frequency filtering of the emulator output, and another that does not. Models that cover both continuous and discontinuous conduction mode are developed. To minimise the input current total harmonic distortion (THD), optimisation is performed, showing that in each case the THD is about the same when the emulated resistance takes its optimal value. The results are experimentally verified on a 1.5 kW rectifier.

Three-phase harmonic reducing diode rectifier

2012

Diode rectifiers are essential utility interfaces for several power converter systems and those provide useful characteristics such as cheap, light weight, compact, high efficiency, lower producing EMI noises, robust for fault high current and etc. Only the unwanted feature of the diode rectifiers is greatly distorted input current which may cause harmonic pollution in power systems. The authors propose a 24-pulse three-phase diode rectifier by means of a simple and unique topology. In this paper, the topology and operating principle are shown and the performance and the practicability are validated through experiments.

Analysis of three-phase rectifiers with constant-voltage loads

1999

In this paper, a numerical analysis of three-phase voltage loaded rectifiers is presented. The simulation is performed on the equation system level, for normalized circuit model. Possible combinations of diode states are analyzed, and it is shown that out of 2 6 = 64 combinations only 13 might occur. For all of the combinations, circuit equations and boundary inequalities are derived. The circuit order is shown to be be zero, one, or two, depending on the diode state combination. Number of boundary inequalities to be monitored is shown to vary from three to six, depending on the diode state combination. Phenomenon of instantaneous combination transitions is analyzed. Modes of the circuit operation are defined. Dependence of various circuit parameters on normalized output voltage is presented. Obtained diagrams may serve as a quick reference guide for the rectifier design, and presented analysis may be of interest in education.

Minimizing Current Distortion of a Three-Phase Bridge Rectifier Based on Line Injection Technique

IEEE Transactions on Power Electronics, 2006

This paper demonstrates a new concept and a novel passive resonant construction, which is connected between the ac and dc sides of the three-phase bridge rectifier, for reducing line current harmonics. This resonant net connection, in combination with the conduction intervals of each diode, generates a circulating third harmonic current between the ac and dc sides of the diode rectifier. This will cause a significant reduction in line current harmonics. As a result of this, the shape of line current becomes nearly sinusoidal. Results of analytical, simulation, and experimental verification on a typical example are presented. The total harmonic distortion (THD) of the line current can be reduced from 32% to 5%. Therefore, based on this concept a very cheap, lossless, and passive rectifier with low THD and almost unity power factor has been developed.

Three-phase full-wave rectifier study with experimental measurements

Electric Power Systems Research, 2009

The present paper is an experimental study of the harmonic absorbed currents by three-phase rectifiers. Laboratory tests have been performed with a rectifier to characterize its absorbed harmonic currents (magnitude and phase angle). From these results, a database that characterizes rectifier harmonic behavior experimentally and allows the rectifier currents to be easily calculated is proposed. The database applicability is experimentally studied in two laboratory tests. The results are validated with PSpice simulations.

Improved Three-Phase High-Quality Rectifier With Line-Commutated Switches

IEEE Transactions on Power Electronics, 2004

The paper presents a three-phase diode rectifier with an add-on simple cell with line-frequency commutated ac switches that is able to greatly improve both power factor and output voltage regulation of rectifiers with passive L-C filters. The boost action introduced by the commutation cell allows for a complete compensation of the voltage drop across the input inductors, so as output voltage regulation can be maintained from no-load to full-load. Moreover, as compared to other line-frequency commutated rectifiers, the proposed circuit allows compliance with the low-frequency harmonic limits defined in the technical report IEC 61000-3-4 for any power range. High-efficiency and minimum EMI are obtained due to the low-frequency commutations. A converter prototype was built and tested. The results confirm the theoretical analysis.

A New Three-Phase Harmonic-Free Rectification Scheme Based on Zero-Sequence Current Injection

IEEE Transactions on Industry Applications, 2005

This paper proposes a new three-phase harmonic-free rectification scheme based on a zero-sequence injection technique. The proposed scheme incorporates two half-bridge inverters and two single-phase transformers to actively and individually shape the positive and negative dc rail currents of the rectifier. The shaped zero-sequence harmonic currents are then circulated through the ac side of the rectifier via a zigzag transformer, resulting in pure sinusoidal input currents in the three-phase diode rectifier. A design example along with component ratings calculation are detailed. Experimental results on a 1.5-kVA prototype are provided to validate the proposed technique. Index Terms-Current injection, harmonic reduction, three-phase diode rectifier, zero sequence. Sewan Choi (S'92-M'96-SM'04) received the B.S. degree in electronic engineering from Inha University, Incheon, Korea, in 1985, and the M.S.