2004아테네 올림픽대회출전 한국레슬링 대표선수의 무산소성 운동능력 및 등속성 근력

Pumping of water requires excessive energy for its operation by consuming a massive amount of diesel, gasoline, electric power etc. The more promising alternative energies to perform the same operation without any energy cost are solar photovoltaic (PV) and wind. These fastest growing renewable energies are more reliable and well suitable for remote villages where there is no possibility of extending transmission lines. Furthermore, these systems are optimal for conditions like only small amount of water needed to be pumped for a particular time. Unlike conventional energy sources of electric power, the renewable energy sources are not dispatchable its power output cannot be controlled. In that case, it involves power conversion stages so that it would necessitate to design an advanced control strategy technique. Those control strategies greatly avoid and protects the system from detrimental operating conditions by monitoring input voltage, water flow, torque, power, pressure, speed and motor vibration etc. Henceforth the use of efficient control strategy not only increase the performance of system it also helps to increase the number of operational hours of solar PV and wind energy systems. In this manuscript, the research work of various control strategies carried out in solar PV and wind energy-based water pumping systems are presented. Additionally, this paper intends to discuss the energy management strategies applied for renewable energy fed water pumping system when the system assisted with third energy system (battery bank, fuel cell, etc). These benefited systems ensure good design, guarantees the control speed required for the motor, regulates the flow of water, assuring accurate operation for all conversion and finally, it maintains precise balance in between the renewable energy generated and power required by the load (pump).

Control and energy management strategies applied for solar photovoltaic and wind energy fed water pumping system: A review

Power grids are cyber-physical systems and can be modelled as network systems where individual units (generators, busbars and loads) are interconnected through physical and cyber links. Network components (nodes/edges) may undergo intentional and/or random failures. In catastrophic cases, a failure initiating from a small set of these components can quickly propagate through the whole network, leading to a cascade of failures that might force a deep whole-grid blackout. Often network components have different vitality and protecting some is more critical than others. This manuscript aims to provide a focused overview of modelling power grids as complex networks and their resilience and reliability analysis. We also perform a critical review of vitality metrics and their precision in power grid resilience analysis. The review is accompanied by some simulations on benchmark and real power grids to show the applicability of these concepts in studying resilience.

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Power Grids as Complex Networks: Resilience and Reliability Analysis

Analysis of logic gates for the switching sequence operation of reduced switch multilevel inverter (MLI) is introduced in this paper. Two variants of MLI with reduced switches are considered for the analysis of the logic gates to obtain proper output voltage level. One MLI is with the symmetrical voltage, and the other is with the asymmetrical voltage. The analysis of the proposed logical operation is presented through the single-phase seven-level output voltage for both symmetrical and asymmetrical inverters. Input pulse pattern for the operation of the logic gates are chosen from the multi carrier pulse width modulation (PWM) techniques as phase disposition (PD), phase opposition disposition (POD), and alternate POD (APOD). The analysis for the generation of the required pulse pattern to operate the switches in MLI is presented as logical equations. The simulation work is performed and evaluated with the MATLAB/Simulink. The real-time simulation is performed for the required pulse pattern and generated with the support of dSPACE 1104. The THD comparative analysis is analyzed with a modulation index and various PWM methods.

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Analysis of Logic Gates for Generation of Switching Sequence in Symmetric and Asymmetric Reduced Switch Multilevel Inverter

This paper proposes a new single-phase 11-level transformerless symmetric/asymmetric inverter with a reduced number of switches. The proposed structure is capable of generating high voltage levels with a lower number of power components (including power switches and gate drivers) for both symmetrical and asymmetrical structures. The symmetric results of the proposed topology are compared with the other symmetric 11-level structures in terms of total harmonic distortion, overall efficiency, total number of switches, number of gate drives and required dc sources. The results show that the system's overall efficiency is high; hence, the system's life span will be high. To regulate the injected current, the model predictive control is applied to control the switches in order to be able to follow the reference current. The performance of the proposed structure is verified by the simulation (PSCAD) results.

A New Transformerless Single-Phase Eleven-Level Inverter with Reduction of Switches Based on Model Predictive Control Method

Comparative analysis of modified multilevel DC link inverter with conventional cascaded multilevel inverter fed induction motor drive

The power systems are functioning nearer to their capacity limits to increase the efficiency of the operation. With the prompt progress of smart grid, wide area measurement system (WAMS) is broadly...

Wide area monitoring for energy system: a review

Recent advances in sensor technologies, actuators, and power storage have opened the door to the development of crewless flying vehicles. The information in this paper is on quadrotor modeling and control. As a result, in this study, a mathematical analysis of the Quad-rotor Unmanned Aerial Vehicle (UAV) is first developed, which is on the basis of the Euler-Newton approach of equating motion and moment forces. Second, a Robust Proportional Integral (PI) system is used to robust the quad-rotor UAV's height and attitude. The PI coefficients are optimized using the Improved Genetic Algorithm (Improve-GA) technique to generate an acceptable outcome for the system. After running several simulations, it was determined that the PI controller is able to monitor the appropriate reference values. According to experimental data, the suggested improved GA-PI controller quickly and effectively stabilized a Quad-rotor UAV, and its response time and settling time are reasonable for attitude stabilization control applications.

P. Vijaya Priya

Papers

Comparative analysis of modified multilevel DC link inverter with conventional cascaded multilevel inverter fed induction motor drive

Wide area monitoring for energy system: a review

Improved GA-PI Technique for Non-Linear Dynamic Modelling of a UAV