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Tetsuo UZUKA

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Kansas State University

Omer Baybars TEK

Yasar University

Western Norway University of Applied Science

Eastern Mediterranean University

Tayfun Gündoğdu

Istanbul Technical University

Mehmet Hakan Hocaoglu

İstanbul Ticaret Üniversitesi

Gazi University

Politeknik Negeri Ujung Pandang

Fernando Lopez-Alves

University of California, Santa Barbara

Armando Marques-Guedes

UNL - New University of Lisbon

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Papers by Tetsuo UZUKA

Voltage Fluctuation Compensator for Shinkansen

Ieej Transactions on Power and Energy, 2005

In AC electric Railway, three-phase voltage is changed into the single-phase circuit of two circu... more In AC electric Railway, three-phase voltage is changed into the single-phase circuit of two circuits with the Scottconnected transformer. If it becomes large unbalancing of the load between single-phase circuits, voltage fluctuation becomes large on three-phase side. Then, Railway Static Power Conditioner (RPC) was developed for the purpose of controlling voltage fluctuation on three-phase side. An RPC is comprised of a pair of self-commutated PWM inverters. These inverters connect the main phase and teaser feeding buses, coupled with a DC side capacitor such as a Back-To-Back (BTB) converter. In this way, the two self-commutated inverters can act as a static var compensator (SVC) to compensate for the reactive power and as an active power accommodator from one feeding bus to another. 20 MVA/60 kV RPCs started commercial operation in 2002 at each two substations on the newly extended Tohoku Shinkansen for compensating voltage fluctuation on three-phase side caused by traction loads, absorbing harmonic current. The results of operational testing indicate that an RPC can accommodate single-phase loads such as those of PWM-controlled Shinkansen and thyristor phase-controlled Shinkansen, and handle the exciting rush current of transformers, as well as compensate for harmonics successfully.

System of Systems in Railway

Design science and innovation, 2023

Selection of Power Supply Systems for High Speed Trains

Quarterly Report of Rtri, 1995

There are two major feeding systems for over 200 km/h of train speed: single phase AC feeding sys... more There are two major feeding systems for over 200 km/h of train speed: single phase AC feeding system and DC feeding system. Many lines with high speed around the world use single phase AC feeding system which has been found to be superior to other systems. However, it is possible to use high voltage DC feeding system if it is cheaper than AC. In this case, feeding voltage of the DC feeding system is required to be from 3 kV to 8 kV to be applied for high speed trains. Also, DC feeding system will be more suitable in case of adoption of the third rail system for over 200 km/h high speed.

Development of New Protective Relay for Long Feeding Circuit

All Shinkansen power feeding systems are provided with protective relays which immediately detect... more All Shinkansen power feeding systems are provided with protective relays which immediately detect the faults in power feeding circuits. The protective relay is built by considering power feeding distance as 30 km or less. However, in case of the Shinkansen lines built from now on, the power feeding distance may occasionally become longer than 30 km, because the substation or sectioning post may be constructed in mountainous district. In that case, the current protective relay may be unable to be used. Therefore, the authors have developed a new protective relay based on a principle different from the past. The developed protective relay can be adjusted to feeding distance of more than 30 km. This paper describes the principle and verification test results concerning the newly developed protective device.

2314 System Experiment result of a quick charge system at tram stops for battery tram

Linear magnetization mover motor due to linear force resulting from the interaction between magnetostatic induction element and electromagnetic coil

Rapid rate train communication network system for processing instrumentation data

IEEJ Transactions on Electronics, Information and Systems, 1995

AC power supply for railways in Japan

Elektrische Bahnen - EB, Apr 15, 2009

Development of Static Voltage Fluctuation Compensator for Ac Electric Railway Using Self-Commutated Inverters

RPC (Railway Static Power Conditioner) is a static voltage compensator to avoid a voltage fluctua... more RPC (Railway Static Power Conditioner) is a static voltage compensator to avoid a voltage fluctuation of 3-phase power grid under an AC electric railway load. Normally, in Japan, 3-phase electric power is transferred to paired directional single-phase feeding circuits. At a substation, RPC links directional feeding circuits using two self-commutated inverters and RPC accommodates and active power of these circuits to balance 3-phase power and compensates a reactive power to regulate a 3-phase voltage fluctuation. At a sectioning post, it can reduce voltage drop using a reactive power. Also, it can act as an active filter to compensate harmonics. This paper reports on the successful results of tests using a small model of RPC and dummy loads such as thyristor phase controlled car.

C503 Fundamental Study of Energy Storage System for DC Electric Railway Applying Electric Double-Layer Capacitors and Batteries

The Proceedings of International Symposium on Seed-up and Service Technology for Railway and Maglev Systems : STECH, 2003

Energy storage media have been remarkably developed m recent years to constitute an energy storag... more Energy storage media have been remarkably developed m recent years to constitute an energy storage system, Electric double-layer capacitors can be rapidly charged and discharged and offer a long life time, high efficiency and maintenance freellow pollution features. Charge and discharge tests of a prototype energy storage system at DC 4ooV were carried out and found that it provides a stable power supply system for DC electric railways. On the other hand, a hybrid system to apply different energy storage media in parallel according to the load pattern rnay be effective. We carried out fundamental tests about different energy storage media and a hybrid system at DC 75V.

Static Voltage Fluctuation Compensator for Electric Railway using Self-commutated Converters

IEEJ Transactions on Industry Applications, 1995

Analysis of the Phenomenon Associated with the Short Circuit of Shinkansen Changeover Switch and Development of New Type Protective Relay

IEEJ Transactions on Power and Energy, 2002

<b>Recent Topics on Power Supply Technology</b>

Quarterly Report of RTRI, 2015

After the Tohoku-Pacific Ocean earthquake, saving energy became a central concern for all Japanes... more After the Tohoku-Pacific Ocean earthquake, saving energy became a central concern for all Japanese railway operating companies, since Japan lost a major source of electric power supply. It follows therefore that R&D at RTRI should focus on power supply technologies. At the same time, for the first half of the 21st Century, Japan will face falling birthrates, an aging society, and a shrinking population, resulting in a rapid decrease of the working population. Consequently, maintenance-free technology is another key subject for RTRI. This paper describes the recent work on power supply technologies.

Practical Application of a New Feeding Transformer for AC Electric Railway Substations

Quarterly Report of RTRI, 2010

電鉄用単相電力補償装置

The Journal of The Institute of Electrical Engineers of Japan, 2010

New type of feeding transformer for AC railway traction system

2009 International Conference on Power Electronics and Drive Systems (PEDS), 2009

... Takemi Akita Electrical Engineering Department Japan Railway Construction, Transport and Tech... more

Analysis Method and Abatement Measure of Magnetic Fields Emitted from Electrified Railway Substations

Quarterly Report of RTRI, 2009

Development of a Deterioration Diagnosis Device for Arresters on Shinkansen Feeding Circuits

Quarterly Report of RTRI, 2013

Two methods currently exist to evaluate degradations in arresters in Shinkansen substations. One ... more Two methods currently exist to evaluate degradations in arresters in Shinkansen substations. One method uses a surge current counter device to count the number of strokes of lightning. However, surge current counter devices sometimes pick up small switching surge of changeover switches, which are not deterioration to the arrester. The other method is to measure normal leakage current of arrester. This method though is potentially unreliable because the leakage current is strongly affected by the feeding voltage harmonics. A deterioration diagnosis device was thus designed with functions to suppress unwanted small surge current counts and provide accurate measurements of the leakage current in the target arrester. This paper describes various field measurement results, the principle underlying the developed deterioration diagnosis device and a new method for extracting the resistive current in the arrester from the overall measured leakage current.

Investigation of Shinkansen Static Changeover Switch Capable of Suppression of Exciting Inrush Current into Transformer on Train

IEEJ Transactions on Industry Applications, 2001

Development of Single Phase Feeding Power Conditioner for Shinkansen Depots

Quarterly Report of RTRI, 2000

Voltage Fluctuation Compensator for Shinkansen

Ieej Transactions on Power and Energy, 2005

In AC electric Railway, three-phase voltage is changed into the single-phase circuit of two circu... more In AC electric Railway, three-phase voltage is changed into the single-phase circuit of two circuits with the Scottconnected transformer. If it becomes large unbalancing of the load between single-phase circuits, voltage fluctuation becomes large on three-phase side. Then, Railway Static Power Conditioner (RPC) was developed for the purpose of controlling voltage fluctuation on three-phase side. An RPC is comprised of a pair of self-commutated PWM inverters. These inverters connect the main phase and teaser feeding buses, coupled with a DC side capacitor such as a Back-To-Back (BTB) converter. In this way, the two self-commutated inverters can act as a static var compensator (SVC) to compensate for the reactive power and as an active power accommodator from one feeding bus to another. 20 MVA/60 kV RPCs started commercial operation in 2002 at each two substations on the newly extended Tohoku Shinkansen for compensating voltage fluctuation on three-phase side caused by traction loads, absorbing harmonic current. The results of operational testing indicate that an RPC can accommodate single-phase loads such as those of PWM-controlled Shinkansen and thyristor phase-controlled Shinkansen, and handle the exciting rush current of transformers, as well as compensate for harmonics successfully.

System of Systems in Railway

Design science and innovation, 2023

Selection of Power Supply Systems for High Speed Trains

Quarterly Report of Rtri, 1995

There are two major feeding systems for over 200 km/h of train speed: single phase AC feeding sys... more There are two major feeding systems for over 200 km/h of train speed: single phase AC feeding system and DC feeding system. Many lines with high speed around the world use single phase AC feeding system which has been found to be superior to other systems. However, it is possible to use high voltage DC feeding system if it is cheaper than AC. In this case, feeding voltage of the DC feeding system is required to be from 3 kV to 8 kV to be applied for high speed trains. Also, DC feeding system will be more suitable in case of adoption of the third rail system for over 200 km/h high speed.

Development of New Protective Relay for Long Feeding Circuit

All Shinkansen power feeding systems are provided with protective relays which immediately detect... more All Shinkansen power feeding systems are provided with protective relays which immediately detect the faults in power feeding circuits. The protective relay is built by considering power feeding distance as 30 km or less. However, in case of the Shinkansen lines built from now on, the power feeding distance may occasionally become longer than 30 km, because the substation or sectioning post may be constructed in mountainous district. In that case, the current protective relay may be unable to be used. Therefore, the authors have developed a new protective relay based on a principle different from the past. The developed protective relay can be adjusted to feeding distance of more than 30 km. This paper describes the principle and verification test results concerning the newly developed protective device.

2314 System Experiment result of a quick charge system at tram stops for battery tram

Linear magnetization mover motor due to linear force resulting from the interaction between magnetostatic induction element and electromagnetic coil

Rapid rate train communication network system for processing instrumentation data

IEEJ Transactions on Electronics, Information and Systems, 1995

AC power supply for railways in Japan

Elektrische Bahnen - EB, Apr 15, 2009

Development of Static Voltage Fluctuation Compensator for Ac Electric Railway Using Self-Commutated Inverters

RPC (Railway Static Power Conditioner) is a static voltage compensator to avoid a voltage fluctua... more RPC (Railway Static Power Conditioner) is a static voltage compensator to avoid a voltage fluctuation of 3-phase power grid under an AC electric railway load. Normally, in Japan, 3-phase electric power is transferred to paired directional single-phase feeding circuits. At a substation, RPC links directional feeding circuits using two self-commutated inverters and RPC accommodates and active power of these circuits to balance 3-phase power and compensates a reactive power to regulate a 3-phase voltage fluctuation. At a sectioning post, it can reduce voltage drop using a reactive power. Also, it can act as an active filter to compensate harmonics. This paper reports on the successful results of tests using a small model of RPC and dummy loads such as thyristor phase controlled car.

C503 Fundamental Study of Energy Storage System for DC Electric Railway Applying Electric Double-Layer Capacitors and Batteries

The Proceedings of International Symposium on Seed-up and Service Technology for Railway and Maglev Systems : STECH, 2003

Energy storage media have been remarkably developed m recent years to constitute an energy storag... more Energy storage media have been remarkably developed m recent years to constitute an energy storage system, Electric double-layer capacitors can be rapidly charged and discharged and offer a long life time, high efficiency and maintenance freellow pollution features. Charge and discharge tests of a prototype energy storage system at DC 4ooV were carried out and found that it provides a stable power supply system for DC electric railways. On the other hand, a hybrid system to apply different energy storage media in parallel according to the load pattern rnay be effective. We carried out fundamental tests about different energy storage media and a hybrid system at DC 75V.

Static Voltage Fluctuation Compensator for Electric Railway using Self-commutated Converters

IEEJ Transactions on Industry Applications, 1995

Analysis of the Phenomenon Associated with the Short Circuit of Shinkansen Changeover Switch and Development of New Type Protective Relay

IEEJ Transactions on Power and Energy, 2002

<b>Recent Topics on Power Supply Technology</b>

Quarterly Report of RTRI, 2015

After the Tohoku-Pacific Ocean earthquake, saving energy became a central concern for all Japanes... more After the Tohoku-Pacific Ocean earthquake, saving energy became a central concern for all Japanese railway operating companies, since Japan lost a major source of electric power supply. It follows therefore that R&D at RTRI should focus on power supply technologies. At the same time, for the first half of the 21st Century, Japan will face falling birthrates, an aging society, and a shrinking population, resulting in a rapid decrease of the working population. Consequently, maintenance-free technology is another key subject for RTRI. This paper describes the recent work on power supply technologies.

Practical Application of a New Feeding Transformer for AC Electric Railway Substations

Quarterly Report of RTRI, 2010

電鉄用単相電力補償装置

The Journal of The Institute of Electrical Engineers of Japan, 2010

New type of feeding transformer for AC railway traction system

2009 International Conference on Power Electronics and Drive Systems (PEDS), 2009

... Takemi Akita Electrical Engineering Department Japan Railway Construction, Transport and Tech... more

Analysis Method and Abatement Measure of Magnetic Fields Emitted from Electrified Railway Substations

Quarterly Report of RTRI, 2009

Development of a Deterioration Diagnosis Device for Arresters on Shinkansen Feeding Circuits

Quarterly Report of RTRI, 2013

Two methods currently exist to evaluate degradations in arresters in Shinkansen substations. One ... more Two methods currently exist to evaluate degradations in arresters in Shinkansen substations. One method uses a surge current counter device to count the number of strokes of lightning. However, surge current counter devices sometimes pick up small switching surge of changeover switches, which are not deterioration to the arrester. The other method is to measure normal leakage current of arrester. This method though is potentially unreliable because the leakage current is strongly affected by the feeding voltage harmonics. A deterioration diagnosis device was thus designed with functions to suppress unwanted small surge current counts and provide accurate measurements of the leakage current in the target arrester. This paper describes various field measurement results, the principle underlying the developed deterioration diagnosis device and a new method for extracting the resistive current in the arrester from the overall measured leakage current.

Investigation of Shinkansen Static Changeover Switch Capable of Suppression of Exciting Inrush Current into Transformer on Train

IEEJ Transactions on Industry Applications, 2001

Development of Single Phase Feeding Power Conditioner for Shinkansen Depots

Quarterly Report of RTRI, 2000