Reliability Improvement of H-Bridge Multi-level Inverter for Medium-Voltage and High-Power Induction Motor Drives Young-Min Park, Kwang-Hwan Lee, and Se-Hyun Lee

Power Electronics Building Blocks PEBB  Power Cell

Reliability Improvement of H-Bridge Multi-level Inverter for Medium-Voltage and High-Power Induction Motor Drives Young-Min Park, Kwang-Hwan Lee, and Se-Hyun Lee Abstract - This paper proposes the reliability improvement of H-Bridge Multi-level (HBM) inverter. This reliability can be implemented through modularization of power circuit, distribution of controller, duplication of controller and communication, and continuous operation method in case of power cell failure for driving medium-voltage & high-power induction motor. It is shown that the modularization and expansion characteristics of the HBM inverter are improved since the individual inverter modules operate more independently when using the proposed concept. Also the fault tolerance is increased by using power cell bypass. The proposed design and control methods are described in detail and the validity of the proposed system is verified experimentally in various industrial fields.
Paper number: TKPE-2014-19-2-1 Print ISSN: 1229-2214 Online ISSN: 2288-6281 ✝ Corresponding author: pym@hhi.co.kr, Power Conversion Research Department, Hyundai Heavy Industries Co., LTD. Tel: +82-31-289-5135 Fax: +82-31-289-5150 1 Power Conversion Research Department, Hyundai Heavy Industries Co., LTD. 2 Power Conversion Research Department, Hyundai Heavy Industries Co., LTD. Manuscript received Sep. 23, 2013; accepted Nov. 25, 2013 ─ 본 논문은 2013년 전력전자학술대회 우수추천논문임
LINK
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kipe/JRJJC3/2014/v19n2/JRJJC3_2014_v19n2_99.pdf

Comparative Analysis of Power Losses for Three-Level T-Type and NPC - Payam Alemi, and Dong-Choon Lee - Korean Institute of Power Electronics

 

 



 

Abstract - In this paper, an analysis of power losses for the three-level T-type and neutral-point clamped (NPC) PWM inverters is presented, in which the conduction and switching losses of semiconductor devices of the inverters are taken into account. In the inverter operation, the conduction loss depends on the modulation index (MI) and power factor (PF), whereas the switching loss depends on the switching frequency. Power losses for the T-type and NPC inverters are analyzed and calculated at the different operating points of MI, PF and the switching frequency, in which the four different models of semiconductor devices are adopted. In the case of lower MI, the NPC-type is more efficient than the T-type, and vice versa. The validity of the power loss analysis has been verified by the simulation results.
LINK
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kipe/JRJJC3/2014/v19n2/JRJJC3_2014_v19n2_173.pdf

Analysis of Leakage Inductance for Toroidal Type Flyback Transformer Park, Chang-Soo ; Kang, Byeong-Geuk ; Shin, Kyoung-Gu ; Chung, Se-Kyo Dept. of Control and Instrumentation Eng., Gyeongsang

 

Abstract - This paper presents an analysis of a leakage inductance for a toroidal type flyback transformer. The equation to calculate the leakage inductance is derived using the MMF diagram of the transformer. The analysis for the different types of the cores and winding structures is also provided using the FEM simulation. The winding structures minimizing the leakage inductance are finally discussed from the simulation and experimental results.

LINK1
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kipe/JRJJC3/2014/v19n2/JRJJC3_2014_v19n2_164.pdf

Method to Prevent the Malfunction Caused by the Transformer Magnetizing Inrush Current using IEC 61850-based IEDs and Dynamic Performance Test using RTDS Test-bed - Kang, Hae-Gweon

Abstract – The digital substations are being built based on the IEC 61850 network. The cooperation and protection of power system are becoming more intelligent and reliable in the environment of digital substation. This paper proposes a novel method to prevent the malfunction caused by the Transformer Magnetizing Inrush Current(TMIC) using the IEC 61850 based data sharing between the IEDs. To protect a main transformer, the current differential protection(87T) and over-current protection(50/51) are used generally.
LINK
http://www.koreascience.or.kr/search/articlepdf_ocean.jsp?url=http://ocean.kisti.re.kr/downfile/volume/kiee/E1EEFQ/2014/v9n3/E1EEFQ_2014_v9n3_1104.pdf

BIRNS Emergency Light Fixture-LED Seismic Testing

His video shows BIRNS Emergency Light Fixture-LEDs (ELF-LEDs) during IEEE-344 seismic qualification testing at the National Technical Systems facility. This demanding test sequence uses a tri-axial acceleration table delivering the equivalent of a seismic event at 10Gs of force in the x, y and z axes.

BIRNS ELF-LEDs are advanced, seismically qualified nuclear grade lighting systems that provide 24-40 hours of standby illumination in the event of loss of AC power, which is 3 to 5 times longer than required by the NRC. These rugged, CE marked, RoHS compliant systems have a lamp life of 50,000 hours, and an 11 W power draw.

http://www.birns.com/emergency-light-fixture-led.html