Programmable PFC Based Hybrid Multipulse Power Rectifier for Utility Interface of Power Electronic Converters

Abstract

In this paper it is proposed a novel hybrid threephase rectifier capable to achieve high input power factor (PF), and low total harmonic distortion in the input currents (T HDI ). The proposed hybrid high power rectifier is composed by a standard three-phase 6-pulses diode rectifier (Graetz bridge) with a parallel connection of single-phase Boost 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 paper describes its principles of operation, with detailed experimental results and discussions on power rating of the required Boost 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 Boost converters, making the proposed solution economically viable for very high power installations, with fast pay back of the investment. 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 rated at 6 kW has been implemented in laboratory and fully demonstrated its operation, performance and feasibility to high power applications.

Hybrid Three-Phase Rectifiers with Active Power Factor Correction: A Systematic Review

“…To understand the principle of operation of the HTR, it is essential to analyze the operation through the current path and the power flow distributed between the rectifiers, since the current will pass through the two rectifiers. The explanation the principle of operation is based on the figures represented in Section 3.2.2, so it can be said that the input currents (I a , I b , I c ) are distributed over two paths, for rectifier 1 (I a1 , I b1 , I c1 ) and for rectifier 2 (I a2 , I b2 , I c2 ), and then after being rectified and processed by the respective converters, the two output currents (I o1 and I o2 , respectively) in DC are added in the DC bus, thus obtaining the current of output (I o ) of the HTR, since the two rectifiers are connected in parallel [2,6,13,[16][17][18]20,23,25,26,28,32,34,36,40]. In a specific way, we will analyze the operation by part, being for the structure of rectifier 1 and then for rectifier 2.…”

“…• (considering only a semi-cycle), thus conducting the current in this interval [20,23,25,28,31,36,38]. In the second mode, the GRAETZ bridge rectifier is connected in series with a BOOST converter to control the output voltage and reduce the ripples of the rectangular current shape.…”

Performance Evaluation of a Novel Hybrid Multipulse Rectifier for Utility Interface of Power Electronic Converters

“…On the other hand, a novel approach that overcomes many disadvantages in the field of multipulse rectifiers is presented and fully evaluated in this paper [19], [20]. The proposed structure was obtained, associating a switched converter in parallel with each leg of a three-phase six-pulse diode rectifier resulting in a programmable input-line current waveform structure, which is shown in Fig.…”

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

“…As a result, such structure is able to replace Sepic converters, but with the obvious drawbacks (volume, weight and cost) of requiring extra magnetic devices. The authors discuss in [20] the implementation with Boost converters, as shown in Fig. 4.…”

“…Hence, the control of the Boost current is no longer lost resulting that the desired input line current waveform can be achieved. It is important to emphasize that, even using single-phase isolating transformers, the proposed PFC-HMPR deploying Boost converters is still more attractive than the multipulse rectifier structures presented in [18] and [19], as described in [20].…”