IJEECM Journal of Electrical Engineering (IJEECM-JEE)

Design and Analysis of a Novel Amorphous Core transformer in Distribution Networks

Authors: K V Gopalachary

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.

Keywords: Amorphous materials; Transformer design; Core loss; Exciting power; Annealing.

DC-DC Converter fed BLDC Pumping system with MPPT based Solar PV System

Authors: K V Gopalachary

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)

Comparison and Analysis of DVR with Different Controlling Methods under Sag Condition in Distribution Network

Authors: Shehnaaz Chandini, G.Vanitha

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 MATLAB/SIMULINK Software.

Keywords: Power Quality, Distribution System, DVR, compensation methods, MATLAB.

PV system integration with grid using fuzzy based H-Bridge multilevel inverter

Authors: Hasen Ali, Dr.T Srinivasa Rao, R Ganesh

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).

Study and Analysis of different types of PLLs used in DVR’s for sag swell compensation under grid fault condition

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.

Keywords: Electric variable estimations, electrical designing, recurrence estimation, recurrence bolted circles, consonant examination, observing, synchronization.

PR Controller based VSC for FRT Enhancement of HVDC Distribution Network

Authors: Konada Naga Ravi Kumar, Meesala Shobha

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.

Direct Torque Control of Brushless DC Motor with Non-sinusoidal Back-EMF

Authors: T.Vamsee Kiran, M.Sunil Kumar

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 results. 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.

Harmonic reduction of non-inverting buck – boost dc/dc converter by introducing LC filters in network

Authors: V Vijaya Lakshmi, V Chennakesavulu

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

A new topology Based 13-Level inverter with various PWM Techniques

Authors: Crucypriya Darshnibhimala, N Balakrishna

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.

A Fuzzy based MMC STSTCOM for Enhance Dynamic behavior of the Network

Authors: P Rangababu, V Chennakesavalu

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.
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