Bharti Dwivedi

Institute of Engineering & Technology - Lucknow | IET Lucknow · Department of Electrical

The inverter-driven renewable energy sources (RESs), such as wind energy conversion systems (WECS), pose major threats toward system stability due to lack of inertia. Hence, virtual inertia concepts have gained popularity, for control and improvisation of the dynamic behavior of RESs, by simulating the kinetic inertia of the synchronous generator....

Doubly-fed induction generator (DFIG)-based wind farms (WFs) are interfaced with power electronic converters. Such interfaces are attributed to the low inertia generated in the WFs under high penetration and that becomes prevalent in a fault scenario. Therefore, transient stability enhancement along with frequency stability in DFIG-based WFs is a m...

Heart is a peculiar organ which performs its activity autonomously. Human body is a volume conductor of electricity having heart as a dipole inside it. Muscles of heart (myocardium) are richly supplied with the nerve fibers. The electrical, mechanical and hydraulic activities of the cardiac system are closely related to each other. Opening and clos...

Doubly Fed Induction Generator (DFIG) based Wind Energy Conversion System (WECS) has been found very effective in harnessing wind power. Conferring to grid code requirements, DFIG needs to stay connected to the grid under fault conditions. This implicates the requirement of enhancing the transient stability through augmenting the Low Voltage Ride T...

Under the deregulated market scenario, the electric power industry is rapidly getting transformed due to integration of increasing renewable generation. Profit maximization has always been of highest priority for all the stakeholders. The generation planning problem is an important problem in the operation and planning of power systems which is req...

In a deregulated power market, the economical-risk due to real-time pricing is critical as it is not permitted to alter the decisions taken once. The existing generation market needs improvement in terms of enhancing its effectiveness and reliability. This article presents a game-theoretic approach-based bidding strategy decision-making through a c...

With the advent of rapid advancements in the energy storage technologies and in harnessing the renewable resources, a variety of mix of “Problem formula- tion techniques” and “Solution methodologies” have emerged for scheduling the power generation in Grid integrated environment. Multiple constituent attributes and their combinations thereof def...

Renewable wind energy is the fastest-growing energy in the forthcoming green energy era and its generation capabilities has been increasing day by day. Large-penetration of Doubly Fed Induction Generator-Wind Turbine (DFIG-WT) creates severe transient stability issues in the power system. Fault Ride Through (FRT) capabilities are the major concerns...

Generation Scheduling commonly known as Unit Commitment Problem is one of the most typical optimization problems in electrical engineering. In this paper, Particle Swarm Optimization Technique with few modifications is implemented as an Artificial Intelligence-based technique for the solution of this convoluted nonlinear optimization problem. The p...

This work contains maximum power point tracking fed Photovoltaic (PV) source, in combination with an energy storage device which is supercapacitor. The DC power obtained from PV source is then fed to an inverter controlled by Sliding Mode Controller connected to variable loads. MPPT-controlled boost converter effectively manages the effect of chang...

The competitive power system market involves very high financial risk due to the essential requirements of real-time bidding decision making. Decisions once taken cannot be altered easily because multiple generators participate in bidding process while simultaneously dispatching to meet the load demand most economically. In order to avoid such risk...

The future of bidding strategy in electricity supply power system needs well established controllable and stable technologies. The financial risk is very high with the real-time market wherein the participants do not have the option to change their decisions once taken. In order to circumvent such risks appropriate bidding strategy needs to be adop...

The trading process in contemporary competitive power supply market needs modifications from time to time to meet the upcoming global fossil fuel crisis and social welfare challenges. Although the existing supplies market bidding structures have adequate mechanisms in place, yet there is room to improve them in terms of enhancing reliability and ef...

Inclusion of renewable energy resources with existing conventional generation resources summons revisit to optimization methods used in the field of generation scheduling. The Unit Commitment problem in itself is a highly convoluted problem governed by complex time varying constraints. It gets even more complicated when additional constraints are a...

The proposed work comprises of an MPPT controlled Photovoltaic (PV) source, in conjunction with a supercapacitor, cascaded with a Sliding Mode Controlled (SMC) Inverter, supplying variable nonlinear loads. The effects of varying solar irradiation and its intermittency have been effectively managed by the MPPT controlled boost converter and charge c...

span lang="EN-US">The proposed work comprises of an MPPT controlled Photovoltaic (PV) source, in conjunction with a supercapacitor, cascaded with a Sliding Mode Controlled (SMC) Inverter, supplying variable linear and nonlinear loads. The effects of varying solar irradiation and its intermittency have been effectively managed by the MPPT controlled...

This work comprises of an MPPT (maximum power point tracking) controlled Photovoltaic (PV) source, in combination with a superca-pacitor, cascaded with a Sliding Mode Controlled (SMC) Inverter, which supplies varying nonlinear loads. The varying solar irradiation effects and its intermittency have been successfully managed by the boost converter co...

The rising energy demand and climate change issues have warranted the inclusion of renewable energy resources with existing conventional fuel based generation system. The intermittent renewable generation require adequate battery support in order to minimize load deficit issues in electrical grid. Hence, an attempt has been made in this paper to fo...

An effort has been made to access what happens to prevailing thermal generation plants if the generation from renewable energy resources is increased above 20% of total generation. A test case has been taken where generation system comprising of ten thermal generating units is in conjunction with a 500 MW Wind Energy generation plant, and a 500 MW...

An effort has been made to access that what happens to prevailing thermal generation plants if the generation from renewable energy resources is increased above 20% of total generation. A test case has been taken where generation system comprising of ten thermal ge-nerating units is in conjunction with a 500 MW Wind Energy generation plant and a 50...

Abstract: This paper describes the influence of different harmonics currents in the motor drive application. A variety of active and passive approaches can be adopted to reduce harmonics in systems that rely on precision motion control. For applications ranging from medical diagnostic to office automation equipment, the need to suppress conducted a...

The increasing trend towards usage of precisely controlled, high torque, efficient and low noise motors for dedicated applications has attracted the attention of researcher in Brushless DC (BLDC) motors. BLDC motors can act as an acceptable alternative to the conventional motors like Induction Motors, Switched Reluctance Motors etc. This paper pres...

This paper describes mathematical modelling and FE analysis of Brushless DC motor. The machine parameter of stator and rotor parts including torque speed characteristics and magnetic analysis are investigate by FE analysis and analytically. The mathematical modelling is carried out by the MATLAB software and FE analysis is carried out by the SPEED...

This paper presents a two stage solution methodology for deterministic unit commitment problem. In the first stage the ON/OFF status of units is determined by priority list method while in the second stage the economic load dispatch has been solved by Particle swarm optimization technique. The proposed technique is applied in MATLAB environment on...

Increasingly growing trend towards usage of green and eco friendly electrical devices has lead to research development in Brushless DC (BLDC) motors. The BLDC motors exhibit better performance in terms of higher efficiency, higher torque under low speed range, higher power density, lower maintenance and lesser noise than other motors. BLDC motors c...

With ever increasing trend of implementation of renewable energy resources in power systems it has become relevant to study the dynamics of their integration with the available technologies. Of all renewable resources, Photovoltaic generation is going to be the most prevalent in India. Keeping this in mind, an attempt has been made in this paper to...

The trend of growing penetration of renewable energy resources in power systems has become pertinent in wake of fast depleting fuel and rising carbon emission. It has, therefore, become relevant to study the dynamics of their integration with the available technologies. Of all renewable resources, Photovoltaic generation is the most prevalent resou...

This paper proposes a constant instantaneous power based controller for a shunt active power filter system (SAPF). A SAPF has been designed, built to work under balanced; unbalanced and distorted supply conditions to meet IEEE 519 recommended harmonic standards. The shunt active filter is controlled by a constant instantaneous power based controlle...

Brushless motors offer several advantages over their brushed counterparts, including more torque per weight, increased efficiency, increased reliability, reduced noise, longer lifetime, elimination of ionizing sparks from the commutator, and overall reduction of electromagnetic interference (EMI). This paper describes the influence of different har...

A new improved ANN control based aircraft shunt filter has been proposed in this paper. The shunt active power filter model has been improved using Genetic Algorithm and fuzzy logic. Genetic Algorithm has been used to find the optimum value of filter inductor; whereas fuzzy logic controller has been used in voltage control loop of the filter. The i...

Three conventional control techniques for extracting reference currents for shunt active power filters have been assessed and their performances have been compared with a novel fuzzy logic based control technique. Critical analysis of Comparison of the compensation ability of different control strategies based on THD and speed will be done and sugg...

Assessment of three conventional control techniques for extracting reference currents for shunt active power filters have been done and their performances have been compared with fuzzy logic based control technique. Critical analysis of Comparison of the compensation ability of different control strategies based on THD and speed will be done and su...

Three traditional control techniques for extracting reference currents for shunt active power filters have been assessed and their performances have been compared, when Genetic algorithm and fuzzy logic controller have been applied in these strategies to improve them. Critical analysis of Comparison of the compensation ability of different control...

Three conventional control techniques for extracting reference currents for shunt active power filters have been assessed and their performances have been compared, when Genetic algorithm and fuzzy logic controller have been implemented in these strategies to improve them. Critical analysis of Comparison of the compensation ability of different con...

Fundamentals of electrical engineering is a text targeted towards first-year undergraduate students across all streams of engineering. This book aims at explaining the basic concepts of electrical circuits in a clear-cut and simplified manner. It begins from the topics which students have already dealt with at the 10+2 level and relates them to the...

Fundamentals of electrical engineering is a text targeted towards first-year undergraduate students across all streams of engineering. This book aims at explaining the basic concepts of electrical circuits in a clear-cut and simplified manner. It begins from the topics which students have already dealt with at the 10+2 level and relates them to the...

Latest innovative ideas to make the life easier using the technology depends upon the application of power electronics in turn about power quality. With increasing quantities of non-linear loads being added to electrical systems, it has become necessary to establish criteria for limiting problems from system voltage degradation. This paper presents...

The direct torque control (DTC) speed control scheme of an induction motor surpasses the vector control in the sense that it controls the torque directly and does not use transformations and current modulator. The only snag in DTC scheme is the presence of high content of torque ripples in the output torque. This paper presents a novel approach tow...

The growth in power electronics has impacted many loads that traditionally were considered linear in nature. As a result, the number of nonlinear loads has increased and is expected to increase dramatically in the years ahead. Which in turn polluting the power quality and creating problems. This paper discusses about harmonics, power quality proble...

A Routh-Pade approximation method is presented for obtaining stable reduced order model of 2-D non-separable-denominator discrete-time system. The proposed method preserves initial power-series-expansion-coefficients/Markov-parameters of the system as well as minimizes the errors between a set of subsequent power-series-expansion-coefficients and/o...

Power quality problem causes a misoperation or failure of end user equipments. Distribution network, sensitive industrial loads and critical commercial operations suffer from outages and service interruptions which can cost financial losses to both utility and consumers. In India the use of electronic loads is increasing very fast and the gap betwe...

Robust control of torque has been a motivation for research in the servo and electric drives industry. For industrial drives and servo applications AC machine drives are gaining prominence over the conventional DC-motor drives. Two methods, (a) field oriented control (FOC) and (b) the direct torque control (DTC) have been proposed to control an AC...

This note describes a novel approach to Routh-Padé approximation problem relating to the construction of a stable reduced-order approximants for continuous-time Controller. In this method, stability and the first r time-moments/Markov-parameters are preserved as well as the errors between a set of subsequent time-moments/Markov-parameters of the sy...

The controllability of torque in an induction motor without any peak overshoot and less ripples with good transient and steady state responses form the main criteria in the designing of a controller. Though, PI controller is able to achieve these but with certain drawbacks. The gains can not be increased beyond certain limit so as to have an improv...

This note presents a study of the effect of time-moments and Markov-parameters on reduced order modeling and to identify suitable combination of time-moments and Markov-parameters to highlight the significance of retaining or near retaining a few terms (time-moments/Markov-parameters) in excess of r terms in arriving at a good overall time response...

This study represents an ANN based computational scheming of physical, chemical and biological parameters at flask level for mass multiplication of plants through micropropagation using bioreactors of larger volumes. The optimal culture environment at small scale for Glycyrrhiza plant was predicted by using neural network approach in terms of pH an...

This note describes a novel approach to Routh-Padé approximation problem relating to the construction of reduced-order approximants for continuous-time unstable systems. In this method, stability and the first r time-moments/Markov-parameters are preserved as well as the errors between a set of subsequent time-moments/Markov-parameters of the syste...

Over modulation switching enables the operation of an inverter beyond the normal region, unto the six-step range. As volt-sec compensation is not possible in every sampling period, it is achieved in every sector of operation in overmodulation. The approach presented here segregates the OVM switching into two modes namely, Mode-I and Mode- II. In Mo...

Globally the demand of power is intensifying day by day, which is causing the gap between demand and the generation to be high. Further the use of solid state devices based loads has made the power quality, reliability and stability a critical issue. Moreover, there is continuous thrust on optimal utilization of the non-conventional energy resource...