1. Energy and Environmentally-friendly Solutions for Railway Systems of the Mitsubishi Electric (MELCO)
Dr. Yoshiyasu HAGIWARA,
Mitsubishi Electric Corporation (MELCO),
Tokyo, Japan
2017/10/24, International Rail Safety Conference,
Hong Kong
Thema4: Sustainability

2. CONTENTS Corporate Overview, Mitsubishi Electric corporation
Expansion of Overseas business
Energy Management Systems for Railway applications
TEMS (Train Energy Management System)
REMS (Railway Energy Management System)
SEMS (Station Energy Management System) & FEMS (Factory Energy Management System)
Conclusion

3. 1. Corporate Overview

4. 1. Corporate Overview Mitsubishi Electric Corporation (MELCO)
Head Office: Tokyo Building, Marunouchi,
Chiyoda-ku, Tokyo , Japan
●President & CEO:
● Established:
● Consolidated Net Sales:
● Paid-in Capital:
● Shares　Issued:
● Consolidated Total Assets:
● Consolidated Employees:
Masaki Sakuyama
January 15, 1921 
¥4,238.7 billion (€ billion)
¥175.8 billion (€ billion)
2,147,201,551 shares
¥4,180.0 billion (€ billion)
138,700
(As of March 31, 2017)
(Exchange rate: ¥120=€1) 3

5. 1. Corporate Overview Business Fields
Energy & Electric Systems
Industrial & Automation Systems
Power Generation System
Railway Systems
Automation Equipment
Industrial Products
Information &
Communication Systems
Electronic Devices
Home Appliances
Power Devices
Digital　AV
Room Air Conditioners
Communications Satellite
MELCO provides products from Space satellites, infrastructures, to living and personal items

6. Products for Transportation Field
1. Corporate Overview
Products for Transportation Field
On-board
CBTC wayside network
Concept CBTC system operation
Repair and maintenance area
Substation
Power supply management system
Passenger information
Data center
Train operation control equipment
Operation control center
On-board equipment monitoring
Depot
Train operation support
Crew
area
Crew operation support
TCMS
ATO control equipment
CBTC onboard network
Train Vision
VVVF Inverter
Electronic Interlocking
Hub equipment
Automatic Train Supervision
MELCO provides products in transportation fields from rolling stock to ground facilities

7. 2. Expansion of Overseas business

8. 2. Expansion of Overseas business
Dusseldorf, Germany
Italian Plant
U.K. Maintenance Base
Chinese Plant & Maintenance Base
Beijing
Mother Plants in Itami, Nagasaki, and Kobe
New York Maintenance Base
Mexican Plant & Maintenance Base
Madrid / Beasain, Spain
Singapore
Indian Plant & Maintenance Base
Hong Kong
Moscow, Russia
Sydney Plant & Maintenance Base
Pittsburgh Plant
Production /
Maintenance base
Other sales base
Equity participation
Sao Paulo
Mitsubishi Electric’s overseas bases
Warsaw, Poland
MELCO started railway business in 1922 for domestic market, then for overseas market in 1960.
Overseas sales and production bases have been expanded to Asia, America and Europe.

9. 2. Expansion of Overseas business
Mitsubishi Electric products in Hong Kong
Mitsubishi Electric has contributed for urban transport in Hong Kong.
Our propulsion systems have been used for the rolling stock of MTR since 1980's.
The propulsion systems and other systems like APS and TCMS for more than 1,900 cars in Hong Kong has been and being supplied.

10. 3. Energy Management Systems for Railway application

11. 3. Energy Management Systems for Railway applications
SEMS
Station Energy Management System
REMS
Railway Energy Management System
Visualize energy
consumption
Station
Depot
Head office, affiliates
Operation control center
Substation
Train
Reduce size and
weight of equipment
Reduce CO2 emission
Use natural energy
Information Network
Energy Network
TEMS
Train Energy Management System
Mitsubishi Electric contributes to the realization of a low-carbon society by proactively developing systems for the transportation infrastructure.
Efficient use of energy is achieved through the following four systems:
-The Train energy management system, (TEMS)
-The Station energy management system, (SEMS)
-The Factory and depot energy management system, (FEMS) and
-The Railway energy management system,( REMS)
Effective use of
regenerative energy
FEMS
Factory Energy Management System
Energy Management System consists of four fields of railway applications

12. 4. TEMS (Train Energy Management System)

13. 4. TEMS (Train Energy Management System)
High-Efficiency on-board equipment and optimum control of entire trainset enhance total environmental performance of train systems.
Optimum control of entire trainset
Train Control and Monitoring System 放電
VVVF
インバータ 充電
On-board devices
VVVF inverter

14. 4. TEMS (Train Energy Management System)
On-board devices
SiC applied Inverter
 The world‘s first Silicon carbide (SiC) power modules inverter installed in a commercial train.　*SiC is silicon carbide (a chemical compound of carbon and silicon)
All-SiC applied VVVF inverter for commuter train
The amount of regenerative electric energy is increased by reducing power loss
World’s first *1
ALL-SiC
Power
Module
applied
Energy Consumption
40%
reduction
Total energy consumption of railcar systems, including traction motors, is reduced by 40% *2
Size and Weight
80%
reduction
Size and weight are reduced by about 80% *2
MITSUBISHI ELECTRIC applied
The world‘s first Silicon carbide (SiC) power modules inverter installed in a commercial railcar.
Due to the advantaged device characteristic of SiC,
We can reduce 30% energy consumption and 65% size/weigh.
Why we can do “World’s first” ?
The reasons are,,,,
*1 – As of Dec 2013
*2 – Comparison of conventional traction inverter with GTO power Modules
MELCO is the world leading manufacture of SiC device, technology, and applications

15. 4. TEMS (Train Energy Management System)
MELCO Semiconductor Technology
■ Advantage of new device SiC
- Low power loss
- High frequency switching → Noise emission Reduction - High operating temperature
Feedback
Semi-conductor Technology
Engineering
for
Railcars
Optimizing
Power Device Development
Conventional Traction Inverter
with IGBT power module
New Traction Inverter
with All-SiC power module
Reduction of Power Loss
Low-power-loss, All-SiC power module applied
Effect on Propulsion Systems
Reduction of Power Consumption
Simplification of Cooling System
Weight Reduction, Size Reduction
MITSUBISHI ELECTRIC manufacture power device by ourselves.
With the good relation, we are developing low power loss device for Rolling Stock application.
The new generation power device is Silicon carbide SiC, which is very low power loss.　
（Inverter Loss:　Hybrid 35%、Full 55%)
This contributes to .
Weight Reduction, Size Reduction Simplification of Cooling System => 65%
Reduction of Power Consumption 30% is not only the low loss but also
By using the advantage of low loss,
it is possible to expand the performance of electro dynamic brake
and this result to increase regenerative energy.
This is the reason why we can reduse 30% energy consumption.
Next I explains the reason SiC can reduce the power loss.
･Transistor Turn-on Switching Loss
　　⇒65% Power Loss Reduction
･Transistor Turn-off Switching Loss
　　⇒85% Power Loss Reduction
･Diode Switching Loss
　　⇒95% Power Loss Reduction
＊Compared to Conventional Si-based Inverters

16. 4. TEMS (Train Energy Management System)
On-board devices
Battery powered vehicle
(a) When traveling in an electrified section
(b) When traveling in an unelectrified section
No overhead catenary in unelectrified sections
DCDC converter
group 1
group 2
VVVF inverter
SIV unit
Charging
Battery system
Pantograph is lowered
Dis-
Overhead catenary in
electrified sections
Power converter
for battery-powered EMU
MITSUBISHI ELECTRIC applied
The world‘s first Silicon carbide (SiC) power modules inverter installed in a commercial railcar.
Due to the advantaged device characteristic of SiC,
We can reduce 30% energy consumption and 65% size/weigh.
Why we can do “World’s first” ?
The reasons are,,,,

17. 4. TEMS (Train Energy Management System)
Optimum control of entire train units
Realization of Optimized Train System
TCMS(Train Control & Monitoring System) controls the equipment in order to optimize the power flow in a trainset.
HVAC
Passenger Information System
Security System
Brake Control
Brain for Train
1) Train level Energy Management System
Train control monitoring system manage the each on board equipment.
To realize the optimization of
■　Energy Saving Control
■ Support low energy drive
■　Data base of consumption
MITSUBISHI ELECTRIC has already proved this realization.
Next is the “2) High Efficiency Equipment”
Auxiliary Power Supply
TCMS: Train Control and Monitoring System
■ Support low energy operation
■ Energy Saving Control
■ Data base of consumption
Propulsion Inverter

18. 5. REMS (Railway Energy Management System)

19. 5. REMS (Railway Energy Management System)
Visualize
Overall
Energy use
Support company-wide
energy management
The coordination of on-board and ground facilities allows for even more effective utilization of regenerative energy, and ensures energy management along the entire line.
Train diagram
management for
energy saving
Produce energy efficient
train diagram
Head office,
affiliates
Operation control
center
Station
Depot
Train
Maximum use of
regenerative energy
S-EIV: Station Energy Saving Inverter

20. 5. REMS (Railway Energy Management System)
S-EIV(Station Energy Saving Inverter)
■ Effective usage of regenerative energy from trains S-EIV can supply a part of surplus regenerative energy to station facilities.
Flow of regenerated electric power
Station
Note: S-EIV is a trademark owned by Mitsubishi Electric Corporation
registered in Japan. (S-EIV: Station Energy saving Inverter)
Substation
Braking
S-EIV: Station Energy saving Inverter
Station’s electrical room
200 kW/30 s
Then, I would like to introduce S-EIV to you briefly.
Regenerative energy is mainly used by the other trains in powering.
However, if the trains in powering are far from the train in braking, regenerative energy must be consumed by brake resistors.
S-EIV is installed at the stations near where the regenerative brake is applied for slowdown
and would supply a part of surplus regenerative energy to station facilities
such as air conditioner, escalator, elevator, lighting and so on.
Through this process, S-EIV can lower the electricity cost at the station.
We did a trial calculation of the introduction effect.
In case of Japan, saving energy would be 230MWh/year and saving electricity cost would be 3.22 million Japanese yen.
■Features:
①Close distance between train in braking and regenerative facility
⇒ Minimize loss of the cable resistance
②Compact system without battery　
⇒ Easy installation and low maintenance

21. 5. REMS (Railway Energy Management System)
Feeder Voltage Optimization System
We have been developing the new solution for railway energy saving, combined with substation on-ground and TCMS on-board.
TCMS: Train Control and Monitoring System
Light
Elevator etc.
TIMS
Communication
network
Power
Storage
Station Energy
Saving Inverter
Position
Power demand
Voltage Command
TCMS
Substation
Charge/Discharge
Command
Power flow
Accelerating
Decelerating
Feeder Voltage
Optimization System

22. 6. SEMS & FEMS (Station EMS & Factory EMS)

23. 6. SEMS & FEMS(Station EMS & Factory EMS)
Use of energy-saving equipment in station facilities
Optimize energy use throughout entire station
Application of natural energy resources
Visualize energy consumption
Solar power generators
Electrical room,
Machine room, Shops
Power receiving
and distribution system
Ventilation and
air-conditioning system
Elevators, Escalators
LED lighting
Visualize energy consumption
in stations
Integrated station facilities
management system
Station energy
management room
Station

24. 6. SEMS & FEMS(Station EMS & Factory EMS)
Depot
6. SEMS & FEMS(Station EMS & Factory EMS)
FEMS
Visualize
energy consumption
in depots
Integrated depot management system
Individual onsite energy management and support of energy-efficient operation
Effective use of space by installing large-scale solar power generators
Solar power generator system
Train refurbishment equipment

25. 7. Conclusion

26. 7. Conclusion Reduce CO2 emission Use natural energy REMS SEMS
Railway Energy Management System
SEMS
Station Energy Management System
Visualize energy
consumption
Station
Depot
Head office, affiliates
Operation control center
Substation
Train
Mitsubishi Electric, MELCO, contributes to realize the sustainable low-carbon society by proactively developing innovative railway systems. Efficient use of energy is achieved through the following four systems:
-Train Energy Management System, TEMS
-Railway Energy Management System, REMS
-Station Energy Management System, SEMS
-Factory Energy Management System, FEMS
Reduce size and
weight of equipment
Reduce CO2 emission
Use natural energy
Information Network
Energy Network
Effective use of
regenerative energy
TEMS
Train Energy Management System
FEMS
Factory Energy Management System