Abstract: This paper defines about alloyed (Amorphous) core of a distribution transformer. Traditionally transformer cores have been constructed of grain orientated steel alloys, but a new material which has an amorphous structure is being used increasingly in distribution transformers. The material offers advantages over traditional materials and transformers using the core material are being used in a wide range of applications. According to the measured results, the lowest core loss occurs with an annealing temperature 360℃ under a dc magnetic field density 800A/m. Besides, no load test, sudden short circuit test, and lightning impulse test are performed to ensure the transformer performance. Finally, at the same specifications and rated power, experimental results are presented for the amorphous alloy SA1 core transformer and traditional silicon steel core transformer.
Abstract: This paper describes about design and integration of solar photovoltaic (SPV) array. The power generated from PV system is fed to brushless DC (BLDC) motor driven water pump through a DC-DC boost converter to enhance efficiency of solar system. Voltage regulator is used in inverter control system to get soft switching and to regulate the voltage given to BLDC motor to get desired speed. The speed control of BLDC motor is performed by PWM (Pulse Width Modulation) control of the voltage source inverter (VSI) using DC link voltage regulator. The test system performance is analyzed in MATLAB/Simulink software environment.
Keywords: MPPT, solar PV array, BLDC motor, Water pump, Voltage source inverter (VSI)
Abstract: In industries due to power fluctuations and
other factors the power quality gets effects in the
distribution system. Hence Power Quality is the major
concern in case of sensitive loads that are present in
Distribution System. One of the most frequently
occurring power quality problems in distribution
network is voltage sag/swell. The main objective is to
compensate voltage sag by using Dynamic Voltage
Restorer (DVR), here DVR performance is simulated
using four control methods. Those methods are Pre sag
compensation method, In phase compensation method,
Energy Optimization method, In phase advanced
method which are used whenever voltage sag occurs. All
the four methods are compared and In phase advanced
method has found to be better in compensating
magnitude of voltage sag and it is also consuming less
power observed from simulation results. The
performance of DVR is evaluated using simulation in
Keywords: Power Quality, Distribution System, DVR, compensation methods, MATLAB.
Abstract: This paper characterizes another fuzzy based
controller based measured fell H-bridge multilevel
photovoltaic (PV) inverter for single-or three-phase
grid-associated applications. The particular fell
multilevel topology enhances the proficiency and
adaptability of PV systems. To acknowledge better use
of PV modules and maximize the sun based vitality
extraction, a disseminated most extreme power point
tracking control plan is connected to both single-and
three-phase multilevel inverters, which permits free
control of each dc-connection voltage. For three-stage
network associated applications, PV mismatches may
present uneven provided control, leading to lopsided
framework current. To unravel this issue, a control
scheme with tweak remuneration is likewise proposed.
An experimental three-stage seven-level fell H-connect
inverter has been built utilizing nine H-connect modules
(three modules for every stage). Each H-connect module
is associated with a 185-W sun oriented board.
Simulation and test results are exhibited to check the
possibility of the proposed approach.
Keywords: Fuzzy, Cascaded multilevel inverter, distributed maximum power point (MPP) tracking (MPPT), modular, modulation compensation, photovoltaic (PV).
Authors: M Santhosh Kumar, Dr.T Srinivasa Rao, M V Ramana Murty
Abstract: The real system code necessities for the system relationship of appropriated time structures, generally wind and photovoltaic (PV) systems, are ending up being incredibly asking. The transmission system heads (TSOs) are especially worried about the low-voltage-ride-through necessities. Courses of action in view of the foundation of STATCOMs and component voltage controllers (DVRs), and furthermore on front line control functionalities for the current drive converters of scattered time plants, have added to redesign their response under blemished and distorted circumstances and, in this manner, to fulfill these requirements. With a particular true objective to achieve pleasing results with such systems, it is critical to rely on upon exact and speedy system voltage synchronization estimations, which can work under uneven and turned conditions. This paper separates the synchronization capacity of three moved synchronization systems: the decoupled twofold synchronous reference diagram arrange darted circle (PLL), the twofold second demand summed up integrator PLL, and the three-organize enhanced PLL, planned to work under such conditions. Despite the way that distinctive systems in light of repeat darted circles have also been made, PLLs have been picked due to their association with dq0 controllers. In the going with, the unmistakable estimations will be shown additionally, discretized, and their execution will be attempted in an exploratory setup controlled in order to evaluate their precision likewise, execution highlights.
Abstract: This paper proposes a changed current point of confinement methodology (MCLS) and a recurrence hysteresis control (FHC) for enhancing the aggravation ride-through capacity of a VSC-HVDC interface providing aloof mechanical establishments. Since mechanical burdens are more delicate to voltage drops than recurrence deviations, it's fundamental to ensure the solidness of voltage amid extreme flaws. The advancement of the control techniques incorporates three stages. To begin with, the fundamental component that influences the air conditioner voltage in the latent mechanical framework is broke down so as to upgrade the voltage solidness all the more adequately. Besides, as indicated by the scientific outcomes, the MCLS is proposed to build the air conditioner voltage in transient conditions. Thirdly, keeping in mind the end goal to improve the MCLS have a control result, the FHC is added to the VSC controller with the MCLS, which can likewise additionally upgrade the air conditioner voltage of the detached framework. The reenactment tests under metallic single-stage and three-stage deficiencies are done in PSCAD/EMTDC, and the outcomes check the legitimacy of the control strategies.
Keywords: PR Controller, passive industrial installations, voltage stability, Voltage Source Converter (VSC), modified current limit strategy, frequency hysteresis control, SVPWM.
Abstract: Abstract—In this paper, a direct torque control (DTC)
technique for brushless dc (BLDC) motors with non-sinusoidal
back-EMF operating in the constant torque region is presented.
This approach introduces a two-phase conduction mode as
opposed to the conventional three-phase DTC drives. In this
control scheme, only two phases conduct at any instant of time.
Unlike conventional six-step PWM current control, by properly
selecting the inverter voltage space vectors of the two-phase
conduction mode from a simple look-up table at a predefined
sampling time, the desired quasi-square wave current is obtained.
Therefore, a much faster torque response is achieved compared to
conventional PWM current control. In this paper, it is also shown
that in the constant torque region under the two-phase conduction
DTC scheme, the amplitude of the stator flux linkage cannot
easily be controlled due to the sharp changes and the curved shape
of the flux vector between two consecutive commutation points in
the stator flux linkage locus. Furthermore, to eliminate the low-
frequency torque oscillations caused by the non-ideal trapezoidal
shape of the actual back-EMF waveform of the BLDC motor, a
pre-stored back-EMF versus position look-up table is designed. As
a result, it is possible to achieve DTC of a BLDC motor drive with
faster torque response due to the fact that the voltage space
vectors are directly controlled while the stator flux linkage
amplitude is deliberately kept almost constant by ignoring the flux
control in the constant torque region. Since the flux control along
with PWM generation is removed, fewer algorithms are required
for the proposed control scheme. A theoretical concept is
developed and the validity and effectiveness of the proposed DTC
scheme are verified through the simulations and experimental
Index Terms—Direct torque control, brushless dc motor drives,
non-sinusoidal back-EMF, two-phase conduction, fast torque
response, low-frequency torque ripples.
Keywords: Direct torque control, brushless dc motor drives, non-sinusoidal back-EMF, two-phase conduction, fast torque response, low-frequency torque ripples.
Abstract: This paper displays an execution of versatile double current mode control (ADCMC) on non-altering buck-support converter. A confirmation of the converter operation with the proposed ADCMC has been performed in consistent state and amid the unsettling influences in the information voltage and the heap resistance and by presenting LC channels. The given recreation with LC channel can give preferable execution over customary converter comes about.
Keywords: Digital controller, duty–discontinuity, mode-transition technique, non-inverting buck-boost converter
Abstract: When contrasted with routine inverter topologies like diode clasped and capacitor cinched inverters, the cascaded multilevel inverter has lesser music and also lower switching stress. The fell topology has more number of power changes prompting more prominent warmth misfortunes, bigger size, higher cost and more door drive hardware. The proposed configuration contains less number of switches and creates lesser harmonics in the yield voltage than the fell topology. A comparison between four distinct sorts of heartbeat width regulation (PWM)techniques, to be specific, In-stage mien (IPD), Anti-phase disposition (APD), Carrier Overlap (CO) and Variable Frequency (VF) PWM strategies, has been finished. The outcomes have been checked through reproduction contemplate in MATLAB/Simulink in order to choose the best PWM technique that gives minimum THD in the yield voltage. A LC channel has been outlined to improve the consonant profile.
Keywords: Multilevel inverter, PWM procedure, add up to harmonic distortion, LC channel.
Abstract: A fuzzy based controller is proposed to control the voltage and current of the DC System. The voltage and current control loops are with fuzzy controller is monitor and control the error. The current loop control, a nonlinear controller based on the passivity based control theory is used in this cascaded structure STATCOM for the first time. The dc capacitor voltage control, overall voltage control is realized by adopting fuzzy controller. Clustered balancing control is obtained by using active disturbances rejection controller (ADRC). Individual balancing control is achieved by shifting the modulation wave vertically which can be easily implemented in FPGA .The proposed system is providing good dynamic performance while compared with the conventional STATCOM topology because of its robust procedure.
Keywords: Fuzzy logic controller, Cost-of-energy, DFIG, loss dissipation, reactive power.