A systematic approach to hybrid railway power conditioner design with harmonic compensation for high speed railway

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A Systematic Approach to Hybrid Railway
Power Conditioner Design with Harmonic
Compensation for High-Speed Railway
Abstract
There are various techniques to relieve the unbalance
problem, such as usage of Scott, YNvd, V/V, and impedance
matching transformers. However, due to traction load variations,
these solutions cannot completely compensate the unbalance
problem. The reactive power and harmonic portions can be
compensated by passive compensators such as capacitor banks
and filters. Compared with passive compensators, active
compensators can provide better dynamic and comprehensive
compensation. The most commonly used compensators in
traction power supply are static VAR compensator (SVC) and
static synchronous compensator (STATCOM). The
compensation performance using SVC for voltage regulation of
25-kV traction is explored. However, its dynamic response is
poor, and compensation results are not satisfactory when the
load is varying. Furthermore, the high-power SVC occupies a
large area. Hereafter, active power filter (APF) is proposed to
provide fast and dynamic response. Unfortunately, the device

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rating of APF is still too high. Compensation device based on
hybrid structure is therefore proposed for lower device rating.
Existing system
An RPC is comprised of pair self-commutated PWM
inverters. These inverters connected to the main phase and teaser
feeding buses, coupled with DC side capacitor such as back-to-
back (BTB) converter. In this way, the two self-commutated
inverters can act as a static var compensator (SVC) to
compensate the reactive power and as an active power
accommodator from one feeding bus to another.
Proposed system
In this paper, a novel hybrid power quality conditioner (HPQC)
is proposed for the co-phase power supply system. The HPQC
can achieve active power balancing, reactive power
compensation and harmonic filtering as pure APC in the co-
phase power supply system. However, the rating of the back-to-
back converter can be lower.

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Advantages
 Reduction in operation voltage can help to reduce the cost
and switching power loss.
Applications
 Electrified railways.

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Block diagram
LOAD
CONVERTER 2
WITH PASSIVE
FILTER
ENERGY
STORAGE
CONVERTER 1
WITH PASSIVE
FILTER
DRIVER
CIRCUIT
PIC CONTROLLER
WITH BUFFER
12V
DC
5V DC

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Tools and software
 MPLAB – microcontroller programming.
 ORCAD – circuit layout.
 MATLAB/Simulink – Simulation.

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LeMeniz Infotech

Interleaved Digital Power Factor Correction Based on the Sliding-Mode Approach This study describes a digitally controlled power factor correction (PFC) system based on two interleaved boost converters operating with pulsewidth modulation (PWM). Both converters are independently controlled by an inner control loop based on a discrete-time sliding-mode (SM) approach that imposes loss-free resistor (LFR) behavior on each cell. The switching surface implements an average current-mode controller so that the power factor (PF) is high. The SM-based digital controller is designed to operate at a constant switching frequency so that the interleaving technique, which is recommended for ac-dc power conversion systems higher than 1 kW, can be readily applied. An outer loop regulates the output voltage by means of a discrete-time proportional-integral (PI) compensator directly obtained from a discrete-time small-signal model of the ideal sliding dynamics. The control law proposed has been validated using numerical simulations and experimental results in a 2-kW prototype. Web : http://www.lemenizinfotech.com web : http://www.lemenizinfotech.com/tag/ieee-projects-in-pondicherry/ Web : http://ieeemaster.com Web : http://ieeemaster.com/power-electronics-ieee-projects-2016-2017/ Web : http://ieeemaster.com/power-system-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

Bumpless control for reduced thd in power factor correction circuits

LeMeniz Infotech

Bumpless Control for Reduced THD in Power Factor Correction Circuits It is well known that power factor correction (PFC) circuits suffer from two fundamentally different operating modes over a given AC input cycle. These two modes, continuous conduction mode (CCM) and discontinuous conduction mode (DCM), have very different frequency-response characteristics that can make control design for PFC circuits challenging. The problem is exacerbated by attempts to improve efficiency by dynamically adjusting the PWM switching frequency based on the load. Adjusting the PWM frequency based on the load limits controller bandwidth and restricts dynamic performance. Prior work has made use of multiple controllers, however, they have not addressed the discontinuity (bump) that exists when switching between controllers. In this paper, bumpless controllers will be synthesized for a 750 watt, semi-bridgeless PFC for the CCM-DCM operating modes. Web : http://www.lemenizinfotech.com web : http://www.lemenizinfotech.com/tag/ieee-projects-in-pondicherry/ Web : http://ieeemaster.com Web : http://ieeemaster.com/power-electronics-ieee-projects-2016-2017/ Web : http://ieeemaster.com/power-system-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

A bidirectional single stage three phase rectifier with high-frequency isolat...

LeMeniz Infotech

A bidirectional single-stage three-phase Rectifier with high-frequency Isolation and power factor Correction This paper proposes a single-stage three-phase rectifier with high-frequency isolation, power factor correction, and bidirectional power flow. The presented topology is adequate for dc grids (or smart-grids), telecommunications (telecom) power supplies, and more recent applications such as electric vehicles. The converter is based on the three-phase version of the dual active bridge (DAB) associated with the three-state-switching cell (3SSC), whose power flow between the primary and secondary sides is controlled by the phase-shift angle. A theoretical analysis is presented and validated through simulation and experimental. Web : http://www.lemenizinfotech.com web : http://www.lemenizinfotech.com/tag/ieee-projects-in-pondicherry/ Web : http://ieeemaster.com Web : http://ieeemaster.com/power-electronics-ieee-projects-2016-2017/ Web : http://ieeemaster.com/power-system-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

A bidirectional three level llc resonant converter with pwam control

LeMeniz Infotech

A Bidirectional Three-Level LLC Resonant Converter With PWAM Control This paper proposes a bidirectional three-level LLC resonant converter with a new pulse width and amplitude modulation control method. With different control signals, it has three different operation modes with different voltage gains. Therefore, it can achieve wide voltage gain range by switching among these three modes, which is attractive for energy storage system applications needing wide voltage variation. The proposed topology operates with constant switching frequency, which is easy to implement with digital control, and it can achieve soft switching for all the switches and diodes in the circuit as a conventional LLC resonant converter. The performance of the proposed converter is validated by the experimental results from a 1-kW prototype with 20 A maximum output current. Web : http://www.lemenizinfotech.com web : http://www.lemenizinfotech.com/tag/ieee-projects-in-pondicherry/ Web : http://ieeemaster.com Web : http://ieeemaster.com/power-electronics-ieee-projects-2016-2017/ Web : http://ieeemaster.com/power-system-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

Efficient single phase transformerless inverter for grid tied pvg system with...

LeMeniz Infotech

This document describes a proposed transformer-less inverter topology for grid-tied photovoltaic systems. The existing dual-parallel buck converter topology has issues where the grid can short circuit if there is no dead time between switches. The proposed topology addresses this by using six MOSFET switches and six diodes in a configuration that allows reactive power injection while overcoming reliability issues. It has advantages like utilizing only MOSFET switches, low leakage current, and not requiring PWM dead times. The proposed single-phase inverter is intended for grid-tied PV applications.

Highly reliable transformerless photovoltaic inverters with leakage current a...

LeMeniz Infotech

Highly Reliable Transformerless Photovoltaic Inverters With Leakage Current and Pulsating Power Elimination This paper presents a transformerless inverter topology, which is capable of simultaneously solving leakage current and pulsating power issues in grid-connected photovoltaic (PV) systems. Without adding any additional components to the system, the leakage current caused by the PV-to-ground parasitic capacitance can be bypassed by introducing a common-mode (CM) conducting path to the inverter. The resulting ground leakage current is therefore well controlled to be below the regulation limit. Furthermore, the proposed inverter can also eliminate the well-known double-line-frequency pulsating power that is inherent in single-phase PV systems. By properly injecting CM voltages to the output filter capacitors, the pulsating power can be decoupled from the dc-link. Therefore, it is possible to use long-lifetime film capacitors instead of electrolytic capacitors to improve the reliability of the PV system. The mechanism of leakage current suppression and the closed-loop control of pulsating power decoupling are discussed in this paper in detail. A 500-W prototype was also built and tested in the laboratory, and both simulation and experimental results are finally presented to show the excellent performance of the proposed PV inverter. Web : http://www.lemenizinfotech.com Web : http://ieeemaster.com Web : http://www.lemenizinfotech.com/power-system-ieee-projects-2016-2017/ Web : http://ieeemaster.com/power-system-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

Grid current-feedback active damping for lcl resonance in grid-connected volt...

LeMeniz Infotech

Grid-Current-Feedback Active Damping for LCL Resonance in Grid-Connected Voltage-Source Converters This paper investigates active damping of LCL-filter resonance in a grid-connected voltage-source converter with only grid-current feedback control. Basic analysis in the s-domain shows that the proposed damping technique with a negative high-pass filter along its damping path is equivalent to adding a virtual impedance across the grid-side inductance. This added impedance is more precisely represented by a series RL branch in parallel with a negative inductance. The negative inductance helps to mitigate phase lag caused by time delays found in a digitally controlled system. The mitigation of phase-lag, in turn, helps to shrink the region of nonminimum-phase behavior caused by negative virtual resistance inserted unintentionally by most digitally implemented active damping techniques. The presented high-pass-filtered active damping technique with a single grid-current feedback loop is thus a more effective technique, whose systematic design in the z-domain has been developed in this paper. For verification, experimental testing has been performed with results obtained matching the theoretical expectations closely. Web : http://www.lemenizinfotech.com Web : http://ieeemaster.com Web : http://www.lemenizinfotech.com/power-system-ieee-projects-2016-2017/ Web : http://ieeemaster.com/power-system-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

Delay dependent stability of single-loop controlled grid-connected inverters ...

LeMeniz Infotech

Delay-Dependent Stability of Single-Loop Controlled Grid-Connected Inverters with LCL Filters LCL filters have been widely used for grid-connected inverters. However, the problem that how time delay affects the stability of digitally controlled grid-connected inverters with LCL filters has not been fully studied. In this paper, a systematic study is carried out on the relationship between the time delay and stability of single-loop controlled grid-connected inverters that employ inverter current feedback (ICF) or grid current feedback (GCF). The ranges of time delay for system stability are analyzed and deduced in the continuous s-domain and discrete z-domain. It is shown that in the optimal range, the existence of time delay weakens the stability of the ICF loop, whereas a proper time delay is required for the GCF loop. The present work explains, for the first time, why different conclusions on the stability of ICF loop and GCF loop have been drawn in previous studies. To improve system stability, a linear predictor-based time delay reduction method is proposed for ICF, while a time delay addition method is used for GCF. A controller design method is then presented that guarantees adequate stability margins. The delay-dependent stability study is verified by simulation and experiment. Web : http://www.lemenizinfotech.com Web : http://ieeemaster.com Web : http://www.lemenizinfotech.com/power-system-ieee-projects-2016-2017/ Web : http://ieeemaster.com/power-system-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

Connection of converters to a low and medium power dc network using an induct...

LeMeniz Infotech

Connection of Converters to a Low and Medium Power DC Network Using an Inductor Circut This paper describes an alternative to connect power converters to a direct-current network with an inductor circuit. The circuit allows the connection of converters through a coil and avoids short-circuit currents with different instantaneous values of voltage output. A description of the calculation and the choice of components together with a real implemented example in a dc network within Smart City project (Endesa Utility) is presented Web : http://www.lemenizinfotech.com Web : http://ieeemaster.com Web : http://www.lemenizinfotech.com/power-system-ieee-projects-2016-2017/ Web : http://ieeemaster.com/power-system-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

Stamp enabling privacy preserving location proofs for mobile users

LeMeniz Infotech

STAMP Enabling Privacy Preserving Location Proofs for Mobile Users Web : http://www.lemenizinfotech.com Web : http://ieeemaster.com Web : http://www.lemenizinfotech.com/android-ieee-projects-2016-2017-2/ Web : http://ieeemaster.com/android-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

Sbvlc secure barcode based visible light communication for smartphones

LeMeniz Infotech

This document summarizes a research paper that proposes SBVLC, a secure system for barcode-based visible light communication between smartphones. It analyzes the security of transmitting barcode streams between device screens and cameras. Three secure data exchange schemes are developed to encode information in barcode streams. The system achieves high security and throughput comparable to NFC. It can enable private information sharing, secure device pairing and contactless payments. Rigorous geometric models were used to examine the system's security, making it the first work to formally study security of VLC and barcode communication between smartphones.

Read2 me a cloud based reading aid for the visually impaired

LeMeniz Infotech

Read2Me A Cloud based Reading Aid for the Visually Impaired Web : http://www.lemenizinfotech.com Web : http://ieeemaster.com Web : http://www.lemenizinfotech.com/android-ieee-projects-2016-2017-2/ Web : http://ieeemaster.com/android-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

Privacy preserving location sharing services for social networks

LeMeniz Infotech

Privacy Preserving Location Sharing Services for Social Networks Web : http://www.lemenizinfotech.com Web : http://ieeemaster.com Web : http://www.lemenizinfotech.com/android-ieee-projects-2016-2017-2/ Web : http://ieeemaster.com/android-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

Pass byo bring your own picture for securing graphical passwords

LeMeniz Infotech

This document describes PassBYOP, a new graphical password scheme that uses live video of a physical token (such as a photo on a mobile phone) rather than static digital images. Three feasibility studies examine its reliability, usability, and security against observation attacks. Results found passwords based on image features to be viable, with task times and error rates comparable to prior schemes. Using a user-owned physical token increased security against observation without additional user burden, showing promise for more secure graphical passwords.

Eplq efficient privacy preserving location-based query over outsourced encryp...

LeMeniz Infotech

Eplq efficient privacy preserving location-based query over outsourced encrypted data Web : http://www.lemenizinfotech.com Web : http://ieeemaster.com Web : http://www.lemenizinfotech.com/android-ieee-projects-2016-2017-2/ Web : http://ieeemaster.com/android-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

Analyzing ad library updates in android apps

LeMeniz Infotech

The document discusses analyzing ad library updates in Android apps. It finds that almost half of Android apps underwent ad library updates over a 12 month period, where an ad library was added, removed, or updated. For nearly 14% of app updates with an ad library update, no changes were made to the app's core functionality, suggesting maintaining ad libraries requires substantial effort. The proposed system compares how apps are updated over time to determine if an update includes ad library changes, core changes, or both.

An exploration of geographic authentication scheme

LeMeniz Infotech

An Exploration of Geographic Authentication Scheme Web : http://www.lemenizinfotech.com Web : http://ieeemaster.com Web : http://www.lemenizinfotech.com/android-ieee-projects-2016-2017-2/ Web : http://ieeemaster.com/android-ieee-projects-2016-2017/ Address: 36, 100 Feet Road(Near Indira Gandhi Statue), Natesan Nagar, Pondicherry-605 005 Contact numbers: +91 95663 55386, 99625 88976 (0413) 420 5444 Mail : projects@lemenizinfotech.com Mobile : 9566355386 / 9962588976

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