Experimento con circuito inversor SPWM monofásico (multiplicacion de frequencia)-PARTE2

 

Single-phase SPWM inverter circuit experiment (unipolar frequency multiplication, bipolar SPWM)-单相SPWM逆变电路实验(单极性倍频)实验前讲解-PART1

 ENGLISH LEGENDED VERSION

 ENGLISH SPEAKING VERSION

사고아크검출장치 신뢰성 평가 시스템 및 평가절차 개발 -Development of the Reliability Evaluation System and Procedures for the Arc-Fault Detection Device-이진식(Jinsik Lee) ; 김정기(Jeong-Gi Kim) ; 김재현(Jae-Hyun Kim) ; 전정채(Jeong Chay Jeon)

 

Development of the Reliability Evaluation System and Procedures for the Arc-Fault Detection Device 사고아크검출장치 신뢰성 평가 시스템 및 평가절차 개발 Jinsik Lee · Jeong-Gi Kim · Jae-Hyun Kim · Jeong Chay Jeon

Abstract 

Arc-fault Detection Devices (AFDDs) which cut off the electric power supply under the event of a fire are adopted in many countries to protect life and property from electric fires. However, a controversy over proper or unwanted trips persists for some adopters in the real fields. To alleviate the controversy, this paper describes the reliability evaluation system for AFDD which automates and extends the unwanted tripping test in IEC 62606. The developed reliability evaluation system considers various conditions on the power source quality, the physical state of wiring circuits, and running electrical appliances. System controller automatically switches and repeats numerous pre-designed testing conditions in order not to be constrained by time. Also, it measures the electrical and operating information to give objective evaluation results to stakeholders. Consequently, the proposed AFDD reliability evaluation can produce more detailed conditions which make AFDD to show unwanted trips and it might improve the reliability of AFDDs by upgrading their algorithm to detect electric arc.

ORIGINAL KOREAN VERSION:  http://journal.auric.kr/kiee/XmlViewer/f449656

MODELING AND HARDWARE FOR THE IMPLEMENTATION OF AN ELECTRONIC CONTROL UNIT FOR A MAGNETRON Kursakov L. A., Agoev A. Z., Kunashev Z. A., Melyazhev A. A., Gaev D. S.

 

MODELING AND HARDWARE FOR THE IMPLEMENTATION OF AN ELECTRONIC CONTROL UNIT FOR A MAGNETRON Kursakov L. A., Agoev A. Z., Kunashev Z. A., Melyazhev A. A., Gaev D. S. Abstract. The paper presents the results of the development of a magnetron power supply unit for ion sputtering installations of non-magnetic materials, which provides smooth and precise control of magne-tron power at direct current. The operation of the electronic unit was simu-lated in the Multisim software environment. The hardware implementation of the electronic power unit for controlling and powering the magnetron is made on a modern electronic component base. The results of experimental tests of the electronic unit are presented.

SEE  FULL ARTICLE: https://www.mediafire.com/file/u0gljenkd7ih1cm/2-MNPK-ESSUiK-2024-115-120.en.mono_Com+marca+d'água.pdf/file

Dynamic Effect of Input-Voltage Feedforward in Three-Phase Grid-Forming Inverters -Berg, Matias; Roinila, Tomi (2020)-Electrical Engineering, Tampere University, 33720 Tampere, Finland; tomi.roinila@tuni.fi

 ABSTRACT

Grid-connected and grid-forming inverters play essential roles in the utilization of renewable energy. One problem of such a converter system is the voltage deviations in the DC-link between the source and the inverter that can disrupt the inverter output voltage. A common method to prevent these voltage deviations is to apply an input-voltage feedforward control. However, the feedforward control has detrimental effects on the inverter dynamics. It is shown that the effect of the feedforward in the input-to-output dynamics is not ideal due to the delay in the digital control system. The delay affects the input-to-output dynamics at high frequencies, and only a minor improvement can be achieved by low-pass filtering the feedforward control signal. Furthermore, the feedforward control can remarkably affect the inverter input admittance, and therefore, impedance-based stability problems may arise at the DC interface. This paper proposes a method based on linearization and extra element theorem to model the effect of the feedforward control in the inverter dynamics. Experimental measurements are shown to demonstrate the effectiveness of the proposed model. 

 LINK :https://trepo.tuni.fi/handle/10024/217417