Danillo B. Rodrigues

New Hybrid High-Power Rectifier With Reduced THDI and Voltage-Sag Ride-Through Capability Using Boost Converter

Temporary voltage sags in the side of network supply voltage are the main cause of untimely stops of automated systems that use adjustable speed drives (ASDs). In this context, this paper presents an analysis of a new hybrid three-phase rectifier which was designed to correct the power factor and to promote voltage-sag ride-through capability to ASDs. In order to prove the effectiveness of the proposed solution, this paper shows experimental results for three case studies, evaluating the performance of the proposed hybrid rectifier under voltage-sag conditions. In all analyzed cases, it was proved that the proposed solution is efficient and can be very attractive for high-power applications.

DSP-Based Implementation of Control Strategy for Sinusoidal Input Line Current Imposition for a Hybrid Three-Phase Rectifier

Due to the considerable increase of electronic power processing devices in various segments of industry, the necessity to control and limit the harmonic content of current injected into the distribution systems through the development of pre-regulator converters, has become ever more apparent. Concomitantly, the development of new microprocessors has provided the possibility for the design of sophisticated control algorithms for power electronics converters. In this context, this paper presents an analysis of a hybrid three-phase rectifier developed for power factor correction to be used as an interface of power electronics converters. The main feature of the proposed structure is the power-sharing technique, which assures robustness, cost reduction, and high power density. In this paper, the authors present a complete discussion concerning the controlled rectifiers power contribution and also a complete analysis concerning the total harmonic distortion of current. Mathematical modeling analysis using state space theory is also presented. Experimental results of a 5-kW laboratory prototype using DSP-based control technique are presented in order to corroborate the theoretical analysis.

Retrofitting technique to improve voltage sags ride-through capability of ASD using SEPIC rectifiers

The main cause of ultimately arrest in automated systems, which use adjustable speed drives (ASDs), are temporary voltage sags. Based in this context, this paper presents an analysis of a hybrid three-phase rectifier developed for power factor correction and to promote voltage sag ride-through capability to ASDs. In order to prove the effectiveness of the proposed solution, this paper also presents results of experimental analysis for several case studies, evaluating the performance of the proposed hybrid rectifier before the voltage sags types A, B, and E. Considering all these cases studied, it was shown that the proposed solution is effective and very attractive for applications under high power. Experimental results under normal power supply for an output power of 5 kW are also included.

Hybrid three-phase rectifier with high power factor and voltage sags ride-through capability for utility inteface of adjustable speed drives

Temporary voltage sags are the main cause of untimely arrest in automated systems that use adjustable speed drives (ASDs). In this context, this paper presents an analysis of a new hybrid three-phase rectifier designed to correct the power factor and to promote voltage sag ride-through capability to ASDs. To prove the effectiveness of the proposed solution, this paper presents results of simulations for several case studies, evaluating the performance of the proposed hybrid rectifier before the voltage sags types A, B, C, D, E, F and G. In all cases under analysis, it was proved that the proposed solution is effective and very attractive for applications in high power. Experimental results under normal power supply for an output power of 5 kW are presented.

Grid connected dc distribution network deploying high power density rectifier for dc voltage stabilization

This paper proposes the use of a high power density ac-dc converter to provide higher efficiency and a tight dc bus for connection of electronic loads as well as renewable energy sources. As a new contribution, the authors present a novel hybrid rectifier structure with a series dc-link voltage compensation technique. The proposed hybrid solution is characterized by the fact that a three-phase Boost Converter in parallel input connection and an isolated dc-dc converter in series output connection with an ordinary non-controlled rectifier provides power factor correction and dc bus voltage stabilization. This structure is also capable of imposing line currents with low total harmonic distortion and voltage sag ride-through capability.

Hybrid high-power rectifier with reduced THDI and voltage sag ride-through capability

Temporary voltage sags are the main cause of untimely arrest in automated systems that use adjustable speed drives (ASDs). In this context, this paper presents an analysis of a new hybrid three-phase rectifier designed to correct the power factor and to promote voltage sag ride-through capability to ASDs. To prove the effectiveness of the proposed solution, this paper presents results of simulations for several case studies, evaluating the performance of the proposed hybrid rectifier under the voltage sags types A, B, C, and D. In all cases under analysis, it was proved that the proposed solution is effective and very attractive for retrofitting applications in high power.

DSP-based implementation of input line current imposition strategy for a single-phase hybrid rectifier

Due to the considerable increase of electronic power processing devices in various segments of industry it becomes necessary to control and limit the current harmonic content injected into the distribution systems through the development of pre-regulator converters. In this context, this paper presents the development and experimental analysis of a new structure of single-phase hybrid rectifier with high power factor and low harmonic distortion of current and digital control based on DSP (Digital Signal Processor). In this proposed hybrid rectifier structure the switched converter process reduced portion of active power delivered to the load and therefore the overall efficiency of the structure is increased. The PWM control technique implemented is able to limit the contribution of the switched converter and at the same time impose an input AC current whose harmonic spectrum is in accordance with the limits imposed by the international standard IEC61000-3-2. Mathematical modeling and experimental results are presented corroborating with the theoretical analysis also included.

A bidirectional single-phase hybrid rectifier proposal for sinusoidal input current imposition, DC bus voltage regulation and active power injection onto the AC grid

This paper presents the design and simulation of a Bidirectional Single-Phase Hybrid Rectifier with high a power factor and low harmonic distortion of the current (THD) in accordance with the international standards IEC 61000-3-2 and IEC 61000-3-4. When operating as a power inverter, the imposition of current onto the grid is performed in accordance with IEEE 1547. Therefore, besides power factor correction, the proposed converter provides DC bus voltage regulation, which allows the DC grid to operate with a restricted DC bus voltage even under AC voltage dip conditions or due to a severe reduction of the power provided by renewable energy sources such photovoltaic and wind.

DC microgrid with bi-directional multistring solar inverter performing active power injection into the AC grid and DC bus voltage stabilization

This paper presents the preliminary results concerning the development of a multistring solar inverter system for dc microgrids. The proposed system is composed of two DC-DC converters as the dc input stage and an ac grid-tied bi-directional full-bridge inverter. Each input dc-dc converter operates with independent MPPT algorithms which are capable of extracting the maximum power even under shading and rapid fluctuations of solar irradiation. Regarding the ac grid-tied inverter, one can outline that it is responsible for the injection of the extra amount of dc power provided by the photovoltaic panels to the ac grid. Besides, in order to assure a tight dc bus voltage, it is also capable of extracting, from the ac grid, the amount of energy that is not provided by the photovoltaic panels due to the inherent characteristic of the solar energy. A digital signal processor (DSP 28335) performs the control of the entire system. In this paper, the authors present preliminary experimental results that demonstrate the MPPT performance even under shading conditions. In addition, simulation analysis demonstrate the bi-directional operating mode of the grid-tied inverter.

Novel proposal of hybrids rectifiers with voltage sag ride-through capability based on series DC voltage compensation technique

The trend for the development of more electric systems for aircrafts, microgrids, and industrial processes has been leading to the need of more efficient and reliable electronic converters. In this scenario, one can highlight the necessity of high power density rectifiers for reducing current harmonics and providing a stabilized intermediate dc-link for connection of electronic loads. Therefore, in this paper the authors present the analysis concerning the development of a novel proposal of hybrids rectifiers structures with wide range of DC voltage regulation based on Series DC Voltage Compensation Technique (SDCVC). The proposed SDCVC Technique provides voltage sag-ride through capability and assures high power density and high efficiency. In order to validated the effectiveness of the proposed solutions, preliminary modeling analysis was performed and corroborated by experimental results obtained through a 1 kW laboratory prototype of a single-phase hybrid rectifier that was put into operation under normal AC system operation, as well as under conditions of AC voltage dips.