Improvement of Single-Switch Bridgeless PFC Cuk Converter for Circulating Current Elimination and Components Maximum Current Stress Reduction

This paper presents the improvement of a single-switch bridgeless PFC Cuk converter for circulating current elimination and maximum current stress reduction on components. Circulating current is eliminated by rearranging the position of input diodes thus the input diodes can block the returning path of current through the input inductors. The principle of circulating current elimination is also discussed in detail in this paper. A 100 W converter with an output voltage of -48 V has been tested to verify the principle. The results of the experimental hardware show the removal of the circulating current, the maximum current stress in input diodes is reduced from 8 A to 2.8 A and the maximum current stress in input capacitors also reduced from 11 A to 9.8 A

A Fuzzy Logic Control Strategy for Buck PFC Converter Based 4- Switch VSI Fed BLDC Motor Drive

In this paper, a new Buck PFC dc–dc converter topology along with fuzzy logic control for a permanent magnet (PM) brushless dc motor (PMBLDCM) has been proposed. The proposed buck-PFC converter topology is on single stage power factor correction converter. A concept of dc link voltage control which is proportional to speed of the PMBLDCM is used in this paper. The stator currents of the PMBLDCM during step change in the reference speed are controlled within the specified limits by an addition of a rate limiter in the reference dc link voltage. The effectives of the proposed control strategy of PMBLDCM drive is validated through simulation results

Обоснование параметров преобразователя постоянного тока для источника автономного электро-снабжения

As the Smart Grid concept has become a part of the electric power industry development, DC/DC conver­ters have turned into a matter of increased interest. This is due to their effective coordination in the DC-bus system operating different types of power sources, including renewable ones and energy storage devices (batteries, supercapacitor modules), and various loads. The article analyzes switch mode power supply DC/DC converters for autonomous power supply systems. The application of the SEPIC (Single Ended Primary Inductance Converter) type converter is substantiated. The techniques of determining the parameters of the converter are presented. The active phase at the duty cycle operation has been demonstrated, and justified in accordance with the theoretical behavior in response to an input voltage change above and below the desired output value. A simulation of the converter's operation in the buck and boost modes in order to stabilize the output voltage at a set level has been performed in the MATLAB / Simulink package. The obtained simulation results show the effectiveness of the suggested solution for an autonomous power supply source.  С внедрением концепции Smart Grid в развитие электроэнергетики нарастает интерес к использованию DC/DC-преобразователей для координированной работы на одну систему шин постоянного тока разнотипных источников питания, имеющих в своем составе источники возобновляемой энергии, накопители электроэнергии (аккумуляторные батареи, модули суперконденсаторов), различную нагрузку. В статье выполнен анализ DC/DC-преобразователей для систем автономного электроснабжения. Обосновано применение преобразователя типа SEPIC (Single Ended Primary Inductance Converter). Представлена методика определения параметров преобразователя. Продемонстрирована и обоснована регулировка активного периода коэффициента заполнения в соответствии с теоретическим поведением после изменения входного напряжения выше и ниже желаемого выходного значения. Выполнено моделирование работы преобразователя в режимах повышения, понижения и стабилизации выходного напряжения в пакете MATLAB / Simulink. Полученные результаты моделирования показывают эффективность предлагаемого решения для источника автономного электроснабжения

Implementation of a Distribution Static Compensator D-STATCOM: Hardware and Firmware Description

This paper describes the implementation of a distribution static power compensator (D-STATCOM) for reactive compensation in electric distribution networks. A three-phase inverter of six pulses with two levels was developed. Hardware implementation of different stages (sensors, power switching, passive elements, and processor) is fully described. Firmware that allows D-STATCOM operation was implemented on a TMS3202F DSP (Texas Instruments) using a modular approach. Correct operation of the D-STATCOM prototype is verified with experimental results

Implementation of a Distribution Static Compensator D-STATCOM: Hardware and Firmware Description

This paper describes the implementation of a distribution static power compensator (D-STATCOM) for reactive compensation in electric distribution networks. A three-phase inverter of six pulses with two levels was developed. Hardware implementation of different stages (sensors, power switching, passive elements, and processor) is fully described. Firmware that allows D-STATCOM operation was implemented on a TMS3202F DSP (Texas Instruments) using a modular approach. Correct operation of the D-STATCOM prototype is verified with experimental results

Implementation of a Distribution Static Compensator D-STATCOM: Hardware and Firmware Description

This paper describes the implementation of a distribution static power compensator (D-STATCOM) for reactive compensation in electric distribution networks. A three-phase inverter of six pulses with two levels was developed. Hardware implementation of different stages (sensors, power switching, passive elements, and processor) is fully described. Firmware that allows D-STATCOM operation was implemented on a TMS3202F DSP (Texas Instruments) using a modular approach. Correct operation of the D-STATCOM prototype is verified with experimental results