The document provides information about academic projects available for M.Tech students in electrical engineering at EEE for the 2013-2014 academic year. It lists several potential project topics in areas like transmission and distribution, renewable energy, motor drives, power electronics, and MATLAB/Simulink modeling. It also provides contact information for students to get more details on project descriptions and includes a table with 7 sample past project titles from 2013. The document aims to help students identify suitable project topics and contact faculty for further information.

1.
Academic Projects for
EEE M.Tech (2013-2014)
We will develop your ideas and your papers also,
For any Further information call-9603150547
e-mail visionsolutions.9@gmail.com

3.
ζ Transmission/Distribution/Protection
ζ HVAC/HVDC
ζ Concepts of Facts (UPFC/SSSC/Statcom/UPQC/TCSC)
ζ Modeling of Facts Devices in Simulink/Mat lab
ζ Distributed Generation
ζ Non Conventional Energy Sources
ζ Fuzzy/Neural Networks
ζ Uncontrollable/controllable Converters
ζ Various PWM Techniques(PWM/SPWM/SVPWM/DPWM/GDPWM)
ζ Multilevel Inverters
ζ Harmonics, Active/Passive Filters
ζ DC to DC converters(Buck/Buck Boost/Cuk/Sepic)
ζ Fuzzy/Neural Networks

4.
ζ Basic Concepts of Motor
ζ AC/DC motors
ζ Electrical Drives
ζ Various speed controlling techniques of AC/DC motors
ζ Fuzzy/Neural Networks
ζ Basics of MATLAB programming/Simulink
ζ Designing of Simple circuits in Simulink
ζ Steady State Space Analysis of RLC Circuits

5.
S.No
1
CODE
SMS13-01
DESCRIPTION
2
SMS13-02
DESCRIPTION
3
SMS13-03
DESCRIPTION
PROJECT TITLE
YEAR
A Carrier-Based PWM Strategy With the Offset
Voltage Injection for Single-Phase Three-Level
2013
Neutral-Point-Clamped Converters
Single-phase three-level neutral point clamped (NPC) converters are
widely applied in high-speed railway electrical traction drive systems.
Significant problem related to the single-phasethree-level NPC converters
is the fluctuation of the neutral-point voltage. In this paper, a capacitor
voltage balancing technique is proposed that injects an offset voltage into
the sinusoidal modulating signals of the conventional carrier-based pulse
width modulation(CBPWM) method. Furthermore, when the injected
offset voltage is maximized, it cannot only balance the dc-link capacitors
voltages, but also reduce switching losses. Theoretical analysis has shown
that both methods can control the neutral point voltage effectively, but the
neutral point voltage controller in the CBPWM with maximum offset
voltage injection (CBPWM-MOVI) has a faster dynamic response. It was
observed that the high-order harmonics frequencies of the line current are
centered around the twice switching frequency in the CBPWM with the
offset voltageinjection (CBPWM OVI) but are centered around the
A Dual Inverter-Based Super-capacitor Direct
Integration Scheme for Wind Energy Conversion
2013
Systems
Interfacing converters used in connecting energystorage systems like
super capacitors and battery banks to windpower systems introduce
additional cost and power losses. Thispaper therefore presents a direct
integration scheme for super capacitorsused in mitigating short-term
power fluctuations in windpower systems. This scheme uses a dual
inverter topology for bothgrid connection and interfacing a super
capacitor bank. The maininverter of the dual inverter system is powered
by the rectifiedoutput of a wind turbine-coupled permanent-magnet
synchronousgenerator. The auxiliary inverter is directly connected to the
super capacitor bank. With this approach, an interfacing converteris not
required, and there are no associated costs and power lossesincurred. The
operation of the proposed system is discussed indetail. Simulation and
experimental results are presented to verifythe efficacy of the proposed
system in suppressing short-term windpower fluctuations.
A ZVS-PWM Three-Phase Current-Fed Push–Pull
2013
DC–DC Converter
In this paper, a ZVS-PWM three-phase currentfedpush–pull dc–dc
converter is proposed. When compared tosingle-phase topologies, the
three-phase dc–dc conversion increasesthe power density, uses the
magnetic core of the transformermore efficiently, reduces the stress on
switches, andrequires smaller filters since the frequency for its design is
higher.The proposed converter employs an active clamping technique
byconnecting the primary side of the transformer to a three-phasefull
bridge of switches and a clamping capacitor. This circuitallows the energy
from the leakage inductances to be reused, increasingthe efficiency of the
converter. If appropriate parametersare chosen, soft-commutation of the
switches (ZVS) can also beachieved. The soft-commutation improves the
efficiency even further,allows higher switching frequencies to be used,
and reducesthe electromagnetic interference significantly. Applications
suchas fuel cell systems, transportation, and uninterruptable

6.
4
SMS13-04
DESCRIPTION
5
SMS13-05
DESCRIPTION
6
SMS13-06
DESCRIPTION
powersupplies are some examples that can benefit from the
advantagespresented by this converter. The theoretical analysis, a design
example,and the experimental results for a prototype implementingthis
topology are presented. The prototype was designed to process4 kWat full
load with an input voltage of 120 V, an output voltageof 400 V, and a
switching frequency of 40 kHz.
Adaptive MPPT Applied to Variable-Speed Micro2013
hydropower Plant
Variable-speed micro hydropower energy systemshave recently received
significant attention in the renewable energyfield, due to its overall
efficiency and great potential availableworldwide. This emergent
technology combined with maximumpower point tracking (MPPT)
techniques allows us to replace theburden classical governing mechanical
systems, being a very effectiveway of ensuring high energy efficiency
when operating in freewater flows. In this paper, a variable-speed micro
hydropower plantbased on a semi-Kaplan turbine is employed and a novel
adaptivehigh-performance MPPT technique is proposed. This allows
hightracking quality due to superior dynamic response and high
An Energy-Efficient Motor Drive With Autonomous
Power Regenerative Control System Based on
2013
Cascaded Multilevel Inverters and Segmented Energy
Storage
This paper presents a cascaded-multilevel-inverter basedmotor drive
system with integrated segmented energy storage.A power-distribution
strategy among the energy source, thesegmented energy storage, and the
electric motor is proposed underdifferent operation modes. A design
guideline for energy storageis provided to meet the proposed powerdistribution strategy.Moreover, the energy storage features not only
implementing theharmonic compensation in all operating modes but also
providingpeak power during acceleration and absorbing regenerative
powerduring deceleration, which improves the energy efficiency of
themotor drive system and reduces the size of the energy source.
Anautonomous power regenerative control system including
voltagebalancing control of segmented energy storage is developed
toperform the smooth power transition between different operationmodes
and provide accurate speed tracking. A 5.5-kW permanent-magnet
synchronous motor (PMSM) drive system has beenbuilt in the laboratory.
Simulation and experimental results areprovided to demonstrate the
effectiveness of the proposed motordrive system.
Analysis, Modeling, and Implementation of a
Multidevice Interleaved DC/DC Converter for Fuel
2013
Cell Hybrid Electric Vehicles
Multiphase converter topologies for use in highperformanceapplications
have received increasing interest in recentyears. This paper proposes a
novel multidevice interleaved
boost converter (MDIBC) that interfaces the fuel cell with thepowertrain
of hybrid electric vehicles. In this research, a Multidevice structure with
interleaved control is proposed to reduce theinput current ripples, the
output voltage ripples, and the size of
passive components with high efficiency compared with the
othertopologies. In addition, low EMI and low stress in the switches
areexpected. The proposed dc/dc converter is compared to other
convertertopologies such as conventional boost converter (BC),
Multidevice boost converter (MDBC), and two-phase interleaved

7.
7
SMS13-07
DESCRIPTION
8
SMS13-08
DESCRIPTION
9
SMS13-09
DESCRIPTION
boostconverter (IBC) to verify its dynamic performance. Furthermore,a
generalized small-signal model is derived for these dc/dc
converters,which has not been previously discussed. A digital dualloopcontrol is designed to achieve the proper regulator for the
converterswith fast transient response. The dc/dc converter topologiesand
their
controller
are
designed
and
investigated
by
usingMATLAB/Simulink. Finally, the proposed converter (MDIBC)
isexperimentally validated with results obtained from a 30-kW
prototypethat has been built and tested in our laboratory based
onTMS320F2808 DSP. The simulation and experimental results
havedemonstrated that the proposed converter is more efficient thanother
dc/dc converter topologies in achieving high performanceand reliability
for high-power dc/dc converters.
Control Strategy for Power Flow Management in a PV
2013
System Supplying DC Loads
The growing concern for energy saving has increasedthe usage of LEDbased street lights, electronic chokes, compactfluorescent lamps, and
inverter-fed drives. Hence, the load profile seen by the electrical grid is
undergoing a notable change as these devices have to operate from a dc
source. Photovoltaic (PV)being a major energy source, the
aforementioned loads can be connected directly to the dc bus. A gridconnected PV system involves a power source (PV array), a power sink
(load), and two power sources/sink (utility and battery), and hence, a
power flow management system is required to balance the power flow
among these sources. One such system is developed for selecting the
operating mode of the bidirectional converter by sensing the battery
voltage. The viability of the scheme has been ascertained by performing
experimental studies on a laboratory prototype. The control strategy is
digitally implemented on an Altera Cyclone II Field Programmable Gate
Array (FPGA) board, and the algorithm is verified for different modes of
operation by varying the load. Experimental results are presented to bring
out the usefulness of the control strategy.
Control Structure for Single-Phase Stand-Alone Wind2013
Based Energy Sources
This paper is analyzing the operation of a stand-alone wind turbine system
with variable-speed permanent-magnet synchronous generator (PMSG)
and a system for storing energy during wind speed and load variations.
Energy storage devices are required for power balance and power quality
in stand-alone wind energy systems. Initially, the holistic model of the
entire system is achieved, including the PMSG, the boost converter, and
the storage system. The power absorbed by the connected loads can be
effectively delivered and supplied by the proposed wind turbine and
energy storage systems, subject to an appropriate control method. The
main purpose is to supply 230-V/50-Hz domestic appliances through a
i Controller Design and Implementation of Indirect b
l h
i
t Th i l ti
lt
lid t d
i
t l
Current Control Based Utility-Interactive Inverter
2013
System
The utility-interactive inverter with critical loadshould be able to provide
critical loads with a stable and seamlessvoltage. This letter proposes an
indirect current controller whichdoes not include any nonlinear factors in
the control block, so thatthe classical control theory can be applied to the
controller design.Also, a phase-locked loop algorithm is proposed to
maintain theconstant frequency across the critical load during the
unintentionalislanding since the magnitude is well regulated, but the

8.
10
SMS13-10
DESCRIPTION
11
SMS13-11
DESCRIPTION
frequencymay vary with the proposed controller. Further, an islanding
detectionmethod is proposed for the controller, which does not cause a
change in magnitude and frequency of critical load voltage.
Coordinated Control of Cascaded Current-Source
2013
Converter Based Offshore Wind Farm
Offshore wind farms with cascaded PWM current-source converters
(CSCs) at both generator- and grid-sidecan eliminate the need for bulky
central offshore converter platform,which is usually used in a voltagesource converter (VSC)based counterpart. This novel system structure can
simplify thesystem configuration and operation. However, the wind
speedinconsistency at each turbine causes different dc-link
currentrequirements for each CSC. This causes a considerable
challengefor systems in which each CSC shares equal dc-link current.
Inorder to overcome the problem, a coordinated control scheme forthe dclink current regulation, which considers wind speed differenceof each
turbine, is proposed. This control scheme enablesthe system to operate at
minimum dc-link current, contributingto a lower operation losses. In the
meantime, the independentcontrol capability of each generator is
guaranteed (e.g., maximumpower tracking to make full utilization of
available wind energy).Furthermore, the whole wind farm control
strategy, which consistsof wind farm supervisory control (WFSC), local
wind turbinecontrol and centralized grid control, is investigated and
studied,where maximum power tracking and power limitation modes
canbe easily achieved. Both simulation and experimental verificationof
the proposed system with use of two permanent-magnet synchronous
generators (PMSGs) are provided.
Coordinated Damping Control Design for DFIG-Based
2013
Wind Generation Considering Power Output Variation
To alleviate the impacts of stochastic wind generationon stability
performance, this paper proposes a novel control designmethod for
coordination and synthesis of damping controllersfor conventional
synchronous generators (SG) and double fedinduction generators (DFIG)based wind generation in multi-machinepower systems. A probabilistic
model of wind generationunderWeibull distribution of wind speed is first
introduced. Basedon this model, an extended probabilistic small signal
stability analysis(SSSA) incorporating wind power generation is proposed
forhandling probability density function (PDF) of its power output.The
optimization problem for tuning of damping controllers isthen formulated,
considering the cumulative distribution function(CDF) of the real part and
damping ratio of eigenvalues obtainedby the proposed probabilistic SSSA
as stability constraints. Particleswarm optimization (PSO) is used to solve
the optimizationproblem and to determine parameters of damping
controllers.The effectiveness of the proposed method is demonstrated
onthe modified New England power system with multi-wind farms
through probabilistic SSSA and transient stability analysis, and itis
compared with conventional deterministic methods. Accuracy of the
proposed probabilistic SSSA is also validated by Monte Carlo simulations
(MCS).

9.
12
SMS13-12
DESCRIPTION
13
SMS13-13
DESCRIPTION
14
SMS13-14
DESCRIPTION
DC-Bus Design and Control for a Single-Phase GridConnected Renewable Converter With a Small Energy
2013
Storage Component
This paper presents a control design approach foroptimum dynamic
response in single-phase grid-connected renewableconverters with
minimum energy storage components. This isa crucial matter in realizing
compact and robust converters withoutuse of bulky and sensitive
electrolytic capacitors. Nonoptimum dynamic response results in
undesired interruptions of the maximumpower point tracking and
reduction of theoverall efficiencyof the system. Common practice is to
select a large dc-bus size inOrder to reduce the double-frequency ripples
that cause harmonicsand to slow down the dynamic response to avoid
large fluctuationson the bus caused by random input power jumps. This
paper showsthat both problems can be addressed to a great extent by
improvingthe control system and without need to excessively increase
thesize of the bus component. This paper proposes a control systemto
hi
th
l
d
id
l ti l d i
th dt
ti i
Design Methodology for a Very High Frequency
2013
Resonant Boost Converter
This paper introduces a designmethodology for a resonantboost converter
topology that is suitable for operation at veryhigh frequencies. The
topology we examine features a low partscount and fast transient
response, but suffers from higher device
Stresses compared to other topologies that use a larger number ofpassive
components. Numerical design procedure is developed forthis topology
that does not rely on time-domain simulation sweepsacross parameters.
This allows the optimal converter design to befound for a particular main
semiconductor switch. If an integratedpower process is used where the
designer has control over layoutof the semiconductor switch, the optimal
combination of converterdesign and semiconductor layout can be found.
lid
h
d
l
h
Differential Power Processing for Increasedd d i
Energy
2013
Production and Reliability of Photovoltaic Systems
Conventional energy conversion architectures in photovoltaic(PV)
systems are often forced to tradeoff conversion efficiencyand power
production. This paper introduces an energyconversion approach that
enables each PV element to operate at itsmaximum power point (MPP)
while processing only a small fractionof the total power produced. This is
accomplished by providingonly the mismatch in the MPP current of a set
of series-connectedPV elements. Differential power processing increases
overall conversionefficiency and overcomes the challenges associated
withunmatchedMPPs
(due
to
partial
shading,
damage,
manufacturingtolerances, etc.). Several differential power processing
architecturesare analyzed and compared with Monte Carlo
simulations.Local control of the differential converters enables distributed
protection
and monitoring. Reliability analysis shows significantly increasedoverall
system reliability. Simulation and experimental resultsare included to
demonstrate the benefits of this approach atboth the panel and subpanel
level.

10.
15
SMS13-15
DESCRIPTION
16
SMS13-16
DESCRIPTION
17
SMS13-17
DESCRIPTION
18
SMS13-18
Digital Plug-In Repetitive Controller for Single-Phase
2013
Bridgeless PFC Converters
This paper investigates a plug-in repetitive controlscheme for bridgeless
power factor correction (PFC) convertersto mitigate input current
distortions under continuous conductionmode and discontinuous
conduction mode operating conditions.From the PFC converter model and
the fact that a type-II compensatoris used, a design methodology to
maximize the bandwidth ofthe feedback controller is suggested. After
that, the error transferfunction including the feedback controller is
derived, and the stabilityof the repetitive control scheme is evaluated
using the errortransfer function. The implementation of the digital
repetitive controlleris also discussed. The simulation and experimental
resultsshow that the input current THD is significantly improved by
usingthe proposed control scheme for a 1-kW single-phase bridgelessPFC
converter prototype.
Digital-Controlled Single-Phase Transformer-Based
2013
Inverter for Non-Linear Load Applications
The paper presents a new digital-controlledsingle-phase transformerbased inverter for non-linear loadapplications. A capacitive full-bridge
circuit is added to provideinstant current under non-linear load condition
and thereby reducingthe harmonics significantly to meet the required
harmonicstandard, IEEE 519-1992, even under non-linear load
condition.The redundant capacity, cost, size and weight of line
frequencytransformer can therefore be dramatically reduced. Moreover,a
new integrated controller for inverter control is proposed toeliminate both
DC current component and steady state error evenunder heavy load
condition. The proposed integrated controllerconsists of a Proportional (P)
controller acts as voltage controller,DC offset canceller, an RMS
compensator and non-linear loadcompensator.Experimental results
derived fromaDSP-based inverter systemwill be presented. The inverter
rating is 1.5 kVA. It will be shownthat both redundant capacity of line
frequency transformer andvoltage harmonics are significantly reduced
even with non-linearload. It will also be demonstrated that the DC current
componentand steady state error are eliminated even under heavy load
condition.These experimental results therefore confirm the superb
performanceof the proposed inverter and control techniques.
Digital-Scalar PWM Approaches Applied to Four-Leg
2013
Voltage-Source Inverters
In this paper, we present two modulation schemesfor generating
unbalanced voltages by means of four-leg voltagesourceinverters. The
first modulation is an extended scheme ofa digital-scalar pulsewidth
modulation previously proposed forcontrolling three-leg inverters. The
second one is based on thedecomposition of the voltage reference signals
into their symmetricalcomponents. The schemes are compared
theoretically bysimulations and experimental results. As a consequence,
we findout a total equivalence between the two modulations despite
theirdifferent conceptions. The fundamentals of both techniques anda
mathematical proof of their equivalence are unfolded Also the
2013
Dual Transformer less Single-Stage Current Source

11.
DESCRIPTION
19
SMS13-19
DESCRIPTION
20
SMS13-20
DESCRIPTION
Inverter With Energy Management Control Strategy
Alternative energy sources have for some time attractedgreat interest in
the area of static converter development.This fact is related in greater part
to issues such as sustainabilityand detrimental effects on the natural
environment, which all contribute
to the viability of this type of energy source. In this context,power
electronics performs important tasks making viable the connectionof all
these kind of clean power sources to the conventionalgrid and also to the
load. From this perspective, a new challengemust be faced which is the
development of energy managementsystems capable of providing
intelligent planning and control ofappliances in low- and high-power
applications. That being so, thispaper intends to contribute presenting a
novel dual transformerlesssingle-stage current source inverter fed by a
proton exchange membrane fuel cell (PEMFC) and a photovoltaic (PV)
array. Highvoltage gain and totally controlled output voltage can be
achievedwithout using dedicated step-up dc–dc converters or
transformerseither. The main feature of this inverter structure is the
intelligentpower management technique which focuses on the extraction
ofmaximum power from the PV array keeping the PEMFC as anenergy
storage system. Theoretical analysis is presented and corroboratedby
experimental results of a 400Wlaboratory prototype.
FPGA-Based Predictive Sliding Mode Controller of a
Three-Phase Inverter
2013
This paper proposed a novel predictive variablestructure-switching-based
current controller for a three-phaseload driven by a power inverter. The
design specifications are robustnessto load electrical parameters, fast
dynamic response, reducedswitching frequency, and simple hardware
implementation.In order to meet previous specifications, a sliding mode
controllerhas been developed, which is designed as finite-state
automata,and implemented with a field-programmable gate array (FPGA)
device. The switching strategy implemented within the state
transitiondiagram provides for a minimum number of switches bythe
three-phase inverter that is confirmed through simulation andexperimental
results. Its regulation using the proposed controllaw provides good
transient response by the brushless ac motor control. However, this does
not limit the wider applicability of theproposed controller that is suitable
for different types of ac loads(rectifier and inverter) and acmotors
(induction, synchronous, andreluctance). A new logical FPGA torque and
speed controller isdeveloped, analyzed, and experimentally verified.
Half-Wave Cyclo-converter-Based Photovoltaic Micro2013
inverter Topology With Phase-Shift Power Modulation
A grid-connected micro inverter with a reduced numberof power
conversion stages and fewer passive componentsis proposed. A highfrequency transformer and a series-resonanttank are used to interface the
full-bridge inverter to the half-wavecycloconverter. All power switches
are switched with zero-voltageswitching. Phase-shift power modulation is
used to control the outputpower of the inverter. A steady-state analysis of
the proposedtopology is presented to determine the average output power
ofthe inverter. Analysis of soft switching of the full-bridge and thehalfwave cycloconverter is presented with respect to voltage gain,quality
factor, and phase shift of the inverter. Simulation and experimentalresults
are presented to validate the operation of the proposed topology.

12.
21
SMS13-21
DESCRIPTION
22
SMS13-22
DESCRIPTION
23
SMS13-23
DESCRIPTION
High-Performance Control of a DC–DC Z-Source
2013
Converter Used for an Excitation Field Driver
The electromechanical interface is a synchronousmachine,because its field
winding permits direct management of themagnetization during speed
variations. For systems with a commondc-link for the drive and excitation
converters, the efficiencyis increased if the excitation drive has boosting
capability. It isshown that with the proposed control strategy the Z-source
converteris suitable for this application, becoming a better alternativethan
the typically used buck converter. The Z-source converter, incombination
with the proposed multiloop control law, can achievethe desired voltage
reference swing and high-performance tracking.An analytical comparison
between the dominant losses of thebuck topology, typically used in FESS,
and the Z-source convertershows that the latter has higher efficiency for
this application. Theparameters of the converter prototype were
experimentally identifiedand used to implement the proposed controller.
The controlstrategy uses the two duty cycles as manipulated variables,
one toallow tracking fast changes in the reference signal and the otherto
adapt the system to the slow changes. The combined action onboth inputs
contributes to the compensation of the no minimumphase response of the
Z-converter. Experimental results show thepotential of the controller for
tracking typical FESS application waveforms.
Improved Transformerless Inverter With CommonMode Leakage Current Elimination for a Photovoltaic
2013
Grid-Connected Power System
To eliminate the common-mode leakage current in thetransformerless
photovoltaic grid-connected system, an improvedsingle-phase inverter
topology is presented. The improved transformerlessinverter can sustain
the same low input voltage as thefull-bridge inverter and guarantee to
completelymeet the conditionof eliminating common-mode leakage
current. Both the unipolarsinusoidal pulse-width modulation (SPWM) as
well as the doublefrequencySPWM control strategy can be applied to
implementthe three-level output in the presented inverter. The high
efficiencyand convenient thermal design are achieved thanks to the
decouplingof two additional switches connected to the dc side.
Moreover,the higher frequency and lower current ripples are obtainedby
adopting the double-frequency SPWM, and thus the total
harmonicdistortion of the grid-connected current are reduced
greatly.Furthermore, the influence of the phase shift between the
outputvoltage and current, and the influence of the junction
capacitancesof the power switches are analyzed in detail. Finally, a
1kW prototypehas been simulated and tested to verify the theoretical
analysisof this paper.
Improved Voltage-Vector Sequences on Dead-Beat
Predictive Direct Power Control of Reversible Three2013
Phase Grid-Connected Voltage-Source Converters
This paper presents a dead-beat predictive directpower control (DPC)
strategy and its improved voltage-vector sequencesfor reversible threephase grid-connected voltage-sourceconverters (VSCs). The instantaneous
variation rates of active andreactive powers, by applying each converter
voltage vector in 12different sectors, are deduced and analyzed. Based on
the powervariation rates, it is found that the values of the predicted
durationtimes for the two conventional active converter voltage vectors
areless than zero when the grid-connected VSC operates as either
arectifier or an inverter. In order to solve this issue, two new

13.
alternativevector
sequences
are
proposed
and
compared.
Experimentalresults on a 1.5 kW reversible grid-connected VSC system
are presentedto validate the feasibility of the proposed voltagevectorsequences on the dead-beat predictive DPC strategy.
24
SMS13-24
DESCRIPTION
25
SMS13-25
DESCRIPTION
26
SMS13-26
Instantaneous Current-Sharing Control Strategy for
Parallel Operation of UPS Modules Using Virtual
2013
Impedance
By regulating the inverter output current everyswitching cycle,
instantaneous current-sharing control strategiesare usually employed in
paralleled modular uninterruptible powersupplies (UPSs). In this paper,
virtual impedance, which is usuallyutilized in the droop method, is firstly
introduced to the instantaneouscurrent-sharing control strategy to achieve
good loadcurrent-sharing performance. The instantaneous circulating
currentmodel of the paralleled system is developed and the
circulatingimpedance is derived as well to clearly identify the
intrinsicnature of unequal sharing of load current. By inserting the
virtualimpedance to the circulating impedance with the help of
propercontrol strategy, good current-sharing capability can be
obtained.The parallel inductor, e.g., coupled inductor, which is
generallyadded at the output of each inverter to reduce the circulating
currentamong modules, can be, therefore, eliminated, contributingto
reduced weight, volume, and cost. In the meantime, the systemoutputvoltage regulation performance, e.g., amplitude andwaveform quality is
not affected by the introduction of the virtualimpedance. The designation
of the virtual impedance is providedand its implementation is simple but
rather effective. Experimentalresults are also provided to verify the
feasibility of the proposed method.
Low-Common Mode Voltage H-Bridge Converter with
Additional Switch Legs
2013
H-bridge converter with additional switch legs (HAconverter) and its
offspring circuit are proposed in this paper withthe intent to reduce the
common mode noise. The proposed topologyconnects grounds of the
input and output terminals, whichgives zero common mode current in the
ideal case. The operationof the proposed circuit is flexible and allows for
the circuit to becapable of both ac–dc and dc–ac conversions. The
proposed topologyis especially advantageouswhen it is applied to the
photovoltaicpower conditioning system in dc distribution system or standalonepower system because they include large stray capacitances andare
prone to common mode EMI. In this paper, a 4-switch HA(HA4S)
converter for both ac–dc rectification and dc–ac inversionis derived from
the proposed HA converter as the implementationexample. The
experimental results based on the proposed andthe conventional prototype
circuits prove that the HA4S converteroutperforms the conventional
counterparts.
Modelling, Analysis, and Design of an Interleaved
Four-Phase Current-Fed Converter With New Voltage
2013
Multiplier Topology

14.
DESCRIPTION
27
SMS13-27
DESCRIPTION
28
SMS13-28
DESCRIPTION
The objective of this paper is focused on developingan interleaved fourphase current-fed converter with new voltagemultiplier topology for lowvoltage distributed energy generation systems. The proposed four-phase
current-fed converter is withthe interleaved configuration and preserving
the inherent advantagesof smaller input current ripple and smaller
inductance size.Through the proposed topology, the high voltage gain can
beachieved using the relatively lower transformer turns ratio. Also,the
voltage stresses of both active switches and rectifier diodesare greatly
reduced so that the low on-resistance active switchescan be adopted, and
the reverse-recovery effect of rectifier diodescan be decreased naturally.
The dc and ac small signal models
of the proposed converter topology are derived for better closedloop
control, and some design guidelines are then given for
circuitimplementation. Both simulation and experimental results
indeedverify the effectiveness of the proposed converter.
New Overall Power Control Strategy for VariableSpeed Fixed-Pitch Wind Turbines Within the Whole
2013
Wind Velocity Range
Variable-speed fixed-pitch (VSFP) wind turbineshave good prospects in
small-to-medium-scale wind power marketsdue to their simple structure,
low cost, and high reliability.One difficulty with VSFP concept wind
turbines is to prevent overspeeding
and overloading problems at excessive wind velocities,which has rarely
been reported in literatures until now. This paperfirst proposes a
sensorless overall power control strategy for acommonly used permanentmagnet-synchronous-generator-basedVSFP concept wind power system,
with which maximum powerpoint tracking operation, constant speed
stalling operation, andconstant power soft-stalling operation are all
realized. The proposedcontrol scheme has a special advantage of simple
structure,i.e., only two regulators are used to realize the three
operationalmodes and also the natural transition between them. An
aerodynamicpower observer is adopted in the proposed scheme tofasten
the MPPT speed. In addition, to enhance system robustnessto parameter
variations and optimize dynamic and static speedcontrolperformance, an
adaptive PI-like fuzzy logic controlleris proposed and used as speed
regulator in the overall powercontrol scheme. The proposed strategy is
verified by simulationand experimental results performed by a 1.2-kW
VSFP concept wind turbine prototype.
One-Cycle-Controlled Single-Stage Single-Phase
2013
Voltage-Sensorless Grid-Connected PV System
Reforms in the electricity sector along with variousrenewable-energypromotion policies have increased the importanceof small grid-connected
photovoltaic (PV) systems utilizingsingle-stage single-phase inverters.
Ruggedness, reliability, andcost effectiveness are the desirable
characteristics of such invertersused in distributed low-power
applications. Schemes based onone-cycle control (OCC) which do not
require the service of aphase-locked loop for interfacing the inverter to the
grid areincreasingly being employed for such applications. However,
theOCC-based schemes reported earlier require sensing of the gridvoltage
which somewhat offsets one of the inherent strengths ofOCC-based
systems. In an effort to overcome the aforementioned
limitation, an OCC-based grid-connected single-stage PV systemis
proposed in this paper which does not require to sense thegrid voltage.
Further, it requires less number of sensors (two) ascompared to that

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required (four) in the earlier reported scheme for the implementation of
the core controller comprising of OCCand maximum-power-pointtracking blocks. The viability of the proposed scheme is confirmed by
performing simulation and experimental validation.
Reactive Power Control of Permanent-Magnet
2013
Synchronous Wind Generator With Matrix Converter
In this paper, the reactive power control of a variablespeedpermanentmagnet synchronous wind generator with a matrixconverter at the grid
side is improved. A generalized modulationtechnique based on singular
value decomposition of themodulationmatrix is used to model different
modulation techniques andinvestigate their corresponding input reactive
power capability.Based on this modulation technique, a new control
method is proposedfor thematrix converter which uses active and reactive
partsof the generator current to increase the control capability of thegridside reactive current compared to conventional modulationmethods. A
new control structure is also proposed which can controlthe matrix
converter and generator reactive current to improvethe grid-side
maximum achievable reactive power for allwind speeds and power
conditions. Simulation results prove theperformance of the proposed
system for different generator outputpowers.
Secondary-Side Phase-Shift-Controlled ZVS DC/DC
Converter With Wide Voltage Gain for High Input
2013
Voltage Applications
In this paper, a soft-switching dc/dc converter withsecondary-side phaseshift control strategy is proposed to improvethe conversion efficiency and
minimize the primary switch voltagestress in the high input voltage
applications. Zero-voltageswitchingperformance is achieved for both the
primary- andsecondary-side power devices in a wide load range to
reducethe switching losses due to the secondary-side phase-shift
controlscheme. Furthermore, compared with the conventional phaseshiftcontrol mechanism, the circulating current at the freewheelingstage is
effectively suppressed as well to minimize the conductionlosses.
Moreover, the voltage stress of the primary switches is onlyhalf of the
input voltage by employing the improved three-levelstructure, which
makes the low-voltage rated power devices availableto improve the circuit
performance. In addition, the convertercan work in the buck, balance, and
boost modes to achieve a relativelywide input voltage range, which is an
expected advantage forthe communication power system to minimize the
electrolytic capacitorswith an acceptable hold-up time. The operation
principleis analyzed and experimental results of a 1-kW 100-kHz
prototypeare provided to verify the effectiveness and the advantages of
theproposed converter
Sensorless Control of CSC-Fed IPM Machine for Zeroand Low-Speed Operations Using Pulsating HFI
2013
Method
In this paper, a sensorless method for low- andzero-speed operations is
proposed for a high-power medium-voltage pulse-width-modulated
current-source-converter-fedinterior-permanent-magnet
motor
drive
system. The proposedmethod is based on the injection of a high frequency
(HF) pulsatingsinusoidal signal in the estimated synchronous
referenceframe of the drive’s field-oriented control (FOC) scheme. The
conventionalFOC control scheme, low switching frequency, dclinkinductor, and the inverter output three-phase filter capacitor of
themedium-voltage
high-power
current-source
drive
present

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somechallenges in the generation and design of the HF-injection signal.To
overcome these challenges, the FOC scheme is modifiedby introducing a
modulation index control with suitable dc-linkcurrent compensation to
enhance the dynamic response of theinjected signal and prevent any
clamp in the injected signal.In addition, a multisampling-space-vectormodulation method isproposed to prevent the distortion in the HF signal
due to a lowswitching frequency to injected signal ratio. A detailed study
andanalysis regarding the influence of low switching frequency,
outputfilter capacitor, and magnetic saturation in the injection methodis
carried out to determine the visible HF range of the injectedsignal. It is
found that, by using the proposed FOC scheme andmultisampling
modulation scheme and by the proper design ofthe HF signal, an accurate
rotor flux angle can be estimated forsensorless zero-/low-speed
operations. Experimental results areprovided to verify the proposed
control method.
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Sine-Wave Amplitude-Modulation Concept for Linear
2013
Behavior of Phase-Modulated Resonant Converters
This paper focuses on a dc–ac resonant power converterusing a special
sine-wave amplitude-modulation conceptwith the objective of achieving a
linear input–output behavior,low harmonic content at the output, and
reduced stages number.This technique can be applied to a wide range of
resonantconverters’ applications. Sine-wave generation techniques
andphase-modulation
method
limitations
are
analyzed.
Alternativesolutions, such as a new predistorted phase modulator, are
developed.A prototype was designed and implemented. Presented
experimentalresults
demonstrate
the
effectiveness
of
the
presentedprinciple.
Variable Switching Frequency PWM for Three-Phase
2013
Converters Based on Current Ripple Prediction
Compared with the widely used constant switchingfrequency pulse-widthmodulation (PWM) method, variableswitching frequency PWM can
benefit more because of the extrafreedom. Based on the analytical
expression of current ripple ofthree-phase converters, variable switching
frequency control methodsare proposed to satisfy different ripple
requirements. SwitchingcycleTs is updated inDSP in every interruption
period based on theripple requirement. Two methods are discussed in this
paper. Thefirst method is designed to arrange the current ripple peak
valuewithin a certain value and can reduce the equivalent switching
frequencyand electromagnetic interference (EMI) noise; the
secondmethod is designed to keep ripple current RMS value constantand
reduce the EMI noise. Simulation and experimental resultsshow that
variable switching frequency control could improve theperformance of
EMI and efficiency without impairing the power quality.
Very Fast Measurement of Low Speed of Rotating
2013
Machines Using Rotating Magnetic Field
The measurement at low speed becomes very difficultdue to the slow
response of transducers. At low speed (below10 r/min), normally,
transducers take several seconds to give therequired output signal. In the
proposed technique, a fast rotatingmagnetic field (RMF) is used to
measure the speed as well asdeviation in speed for low-speed machines. A
sine wave oscillator(single-phase ac source) is used to generate a balanced
three-phaseac voltage, which is applied to the stator windings of a

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synchrowhose rotor is coupled with the rotating member or rotor ofa
motor. The RMF in the air gap generates emf in the rotorof the synchro
whose frequency depends upon the slip speed.Since the RMF revolves at
a speed several times the speed of therotating member or the rotor of the
motor, hence the measurementbecomes very fast. The proposed scheme is
tested successfully evenat 1 r/min, and the overall performance is
recorded at dynamicconditions. The results of the measurements are
compared with aconventional method (tachogenerator), which shows the
accuracyof the proposed method. The output is also obtained in terms
ofdc voltage and dc current, which can be used for feed-back andcontrol
applications.