IEEE Electrification - September 2019 - 71

magnetic synchronous motors, can reduce energy loss
during transmission.
Regenerative braking improves the recovery and reuse
of braking energy to the maximum extent and is the preferred approach for saving energy. Figure 5 shows the
energy flow diagram for regenerative braking.

Optimal Energy Utilization
in High-Speed Train Operations
Current research on energy utilization optimization for
high-speed trains focuses mainly on two procedures.
The first reduces the energy consumption under given
operating conditions with specific technical constraints,

Energy Fed in at Electric Substation

Catenary Losses

and the second improves the driver's handling capabilities by adopting energy-saving operational strategies.
Table 5 depicts methods for energy saving and emission reduction.
To maximize the energy efficiency of trains with
respect to energy flows and energy consumption characteristics, the contribution rates of various energy-saving
measures for high-speed trains are shown in Figure 6.
According to the pie chart distribution, energy recovery
and energy-saving operation are the two most efficient
energy-saving measures. Moreover, once the running
route and operational scheme of high-speed trains are
determined, optimizing the driver control strategy and

Losses in Traction
System
Comfort Functions
Air Resistance and
Friction

Train Net
Energy Intake

Mechanical Energy
at the Wheels
(Train Motion)
Inertia and Grade
Resistance

Regenerative
Braking

Energy Returned Catenary

Energy
Recovery Unit

Dissipated in
Brakes
Losses in Traction
System
Figure 5. The energy flow diagrams for passenger trains with regenerative braking.

TABLE 5. A summary of energy saving and consumption reduction of trains.
(Source: New Lines Programme.)
Measure Types

Ways

Impact on Energy Consumption

Technology

Aerodynamics and friction

Shinkansen air resistance is reduced by 10%, which can reduce 6% of carbon
dioxide emissions.

Reduce the loss-of-traction The overall energy consumption can be reduced by 1% when reducing the energy
system
consumption of traction components by 1%.

Operation

Regenerative braking

This can save 8-9% in energy consumption.

Improve space utilization

A Train à Grande Vitesse double-decker design reduces energy consumption by
30% compared to single-layer designed seats per kilometer.

Improve passenger service function efficiency

Reducing 6% of passenger climate control energy consumption can reduce the
overall energy consumption of trains by 1%.

Effective traction strategy

A 7.5% increase in traction efficiency is seen.

Load factor

Of all the measures, this method has the greatest potential to reduce passenger
per kilometer of energy consumption.

	

IEEE Electrific ation Magazine / S EP T EM BE R 2 0 1 9

71



IEEE Electrification - September 2019

Table of Contents for the Digital Edition of IEEE Electrification - September 2019

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