Analysis of dc link operation voltage of a hybrid railway power quality conditioner and its pq compensation capability in high speed co phase traction power supply To Get this projects Call : 9566355386 / 99625 88976 Visit : www.lemenizinfotech.com / www.ieeemaster.com Mail : projects@lemenizinfotech.com

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Analysis of DC Link Operation Voltage of a
Hybrid Railway Power Quality Conditioner
and its PQ Compensation Capability in High
Speed Co-phase Traction Power Supply
Abstract
With rapid country and city development around the world,
electric railway transportation has played an essential role in
economics and daily lives. This causes high and increasing
transportation demand. It is therefore important that traction
power supply is stable and can provide power with high power
quality to locomotives. However, traction power supply usually
suffers from various power quality problems such as reactive
power, system unbalance and harmonics, etc. Various power
quality compensation techniques, which are discussed in later
sections, are therefore proposed.
Existing system
In traditional AC traction power supply, the power in three
phase grid is transformed into two single phase outputs through
substation and supply power to locomotives. Since the two
single phase power is of different phase, neutral sections
(without power supply) are required to avoid risk of phase
mixing. As locomotives run through neutral sections, they lose

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36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
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power and velocity. Traditional AC power structure is therefore
not suitable for high-speed railway. It is basically composed of a
back to back converter with a common DC link. One converter,
or instance, the Vac phase converter is connected to the
locomotive phase through inductive coupled impedance; and
another phase, Vbc phase converter, is connected to the
unloaded phase through inductive coupled impedance. In order
to control the power flow so as to achieve power quality
compensation, the energy of the DC link must be higher than the
point of common coupling (PCC) point. In other words, the DC
link voltage must be higher than the peak of Vac voltage.
Proposed system
In co-phase traction power locomotive loadings are
connected across one single phase output of substation
transformer only, leaving another phase unloaded. This
proposed structure is beneficial for effective reduction of neutral
sections and higher transformer utilization ratio. The co-phase
structure is thus more suitable for application in high-speed
railway. Hybrid railway power quality conditioner (HPQC) is
thus proposed and developed. Different from traditional RPC,
the Vac phase converter in HPQC is connected to the PCC
through capacitive coupled impedance.

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Advantages
 The capacitive coupled capacitance can help to provide
support voltage during reactive power compensation so that
the DC link voltage can be decreased.
 The device rating and cost of HPQC can thus be reduced.
Applications
 Electric railway transportation.

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Block diagram:
FILTER
CONVERTER 1ENERGY
STORAGE
CONVERTER 2
FILTER
INDUCTIVE
LOAD
12V
DC
5V DC PIC CONTROLLER
WITH BUFFER
DRIVER
CIRUIT

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LeMeniz Infotech
36, 100 Feet Road, Natesan Nagar, Near Indira Gandhi Statue,
Pondicherry-605 005.
Call: 0413-4205444, +91 9566355386, 99625 88976.
Web : www.lemenizinfotech.com / www.ieeemaster.com
Mail : projects@lemenizinfotech.com
Tools and software
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.