Programmable PFC based hybrid multipulse power rectifier for ultra clean power application

Abstract

Abstract-A novel hybrid three-phase rectifier is proposed. It is capable to achieve high input power factor (PF) and low total harmonic input currents distortion (THD ). The proposed hybrid high power rectifier is composed by a standard three-phase six-pulse diode rectifier (Graetz bridge) with a parallel connection of single-phase Sepic rectifiers in each three-phase rectifier leg. Such topology results in a structure capable of programming the input current waveform and providing conditions for obtaining high input power factor and low harmonic current distortion. In order to validate the proposed hybrid rectifier, this work describes its principles, with detailed operation, simulation, experimental results, and discussions on power rating of the required Sepic converters as related to the desired total harmonic current distortion. It is demonstrated that only a fraction of the output power is processed through the Sepic converters, making the proposed solution economically viable for very high power installations, with fast investment payback. Moreover, retrofitting to existing installations is also feasible since the parallel path can be easily controlled by integration with the existing dc-link. A prototype has been implemented in the laboratory and it was fully demonstrated to both operate with excellent performance and be feasibly implemented in higher power applications.

A new design methodology for multipulse rectifiers with Delta auto-connected transformers and a retrofit application in Adjustable Speed Drives (ASDs)

“…The voltages across these windings are also shown in (2). Equation (5) shows the auxiliary angle α. For an 18 pulse rectifier, a third three-phase system is required.…”

“…Therefore several techniques like passive, active and the combination of these techniques for Power Factor correction and THD i reduction are studied in the literature [1], [2].There are a reasonable number of recent utility interface proposals which are intent to improve mains current quality using threephase diode-based rectifiers associated to DC-DC stages such as the boost or SEPIC topologies [3]- [5]. The application of multipulse converters is a suitable and very-well accepted technique for power factor correction of three-phase AC-DC stages, providing low-ripple of the rectified output voltage and reduced total harmonic distortion (THD i ) in the line currents.…”

“…The application of multipulse converters is a suitable and very-well accepted technique for power factor correction of three-phase AC-DC stages, providing low-ripple of the rectified output voltage and reduced total harmonic distortion (THD i ) in the line currents. There are several transformer connections, isolated or not, to obtain rectifier with 12, 18, 24 pulses or more [2], [5]- [12].…”

Harmonic mitigation in voltage source converters based HVDC system using 12-pulse AC-DC converters

“…This technique reduces harmonics and consequently improves the power factor. However, use of hybrid combination of active and passive wave shaping techniques provides a more efficient, effective and economic solution for PQ in many applications [15,16]. Amongst many attempts for PQ improvement in HVDC system, most of the applications are current source converter (CSC) based HVDC using twelve-pulse controlled converter topology.…”

A High Power Factor Hybrid three-phase Rectifier with Regenerative Capability

“…In the last years, the search for rectifiers that comprise the better features of diode bridge rectifiers and the advantages of PWM rectifiers introduces a new class of three-phase rectifiers with low effect on the mains, the Hybrid Rectifiers [12][13][14][15][16][17][18][19][20].…”