Modified Clonal Selection Algorithm based Power System Stabilizers for Damping Power System Oscillations in Multi-machine Power System

Authors:  Naresh, M. Ramalinga Raju and S. V. L. Narasimham


Abstract

In this paper, a novel Modified Clonal Selection Algorithm (MCSA) has been proposed for optimal design of Conventional Power System Stabilizers (CPSS) to damp low frequency power oscillations in a multi-machine power system. Based on the process of elimination of foreign antigens by the immune cells in any biological system, this paper attempts to optimize three constants each of several Power System Stabilizers (PSS) present in New England 10-machine, 39-bus power system. A multi-objective problem has been formulated to optimize a composite set of objective functions comprising the damping factor, and the damping ratio of the lightly damped electromechanical modes. The eigenvalue analysis and nonlinear simulation results presented under a wide range of operating conditions show the effectiveness and robustness of the proposed MCSA based PSS and its ability to provide efficient damping to low frequency oscillations. Further, all these time domain simulation results have been compared with conventional and clonal selection algorithm based PSS to show the superiority of the proposed design approach.

 

Index Terms

 Damping, Modified clonal selection algorithm, Multi-objective optimization, Power system stabilizer

 

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Modified Clonal Selection Algorithm based Power System Stabilizers for Damping Power System Oscillations in Multi-machine Power System

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On-line Wind Turbine Remote Monitoring and Fault Detection Based on Intelligent Device

Authors: Saad Chakkor, Mostafa Baghouri and Hajraoui Abderrahmane

Abstract

In new energy development, wind power has boomed. It is due to the proliferation of wind parks and their operation in supplying the national electric grid with low cost and clean resources. Hence, there is an increased need to establish a proactive maintenance for wind turbine machines based on remote control and monitoring which is necessary with wireless connection for offshore or inaccessible locations while the wired method has many flaws. The objective of this strategy is to prolong wind turbine lifetime and to increase productivity. The hardware of a remote control and monitoring system for wind turbines is designed by taking advantage of GPRS or Wi-Max wireless module to collect data measurements from different wind machines sensors through IP based multi-hop communication. Computer simulations with Proteus ISIS and OPNET tools have been conducted to evaluate the performance of the studied system. Study findings show that the designed device is suitable for application in a wind park.

Index Terms

Embedded System, Monitoring, Wind Turbine, Faults Diagnosis, TCP/IP Protocol, Real Time, Web.

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On-line Wind Turbine Remote Monitoring and Fault Detection Based on Intelligent Device

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AVR with ADRC

Authors: Nagarjuna and M.S. Krishnarayalu


Abstract

Voltage stability is one of the major problems of power systems. Due to reactive power imbalance in power system, voltage magnitudes of buses will deviate from rated values. If reactive power generation is less (more) than reactive power demand, bus voltages decrease (increase) beyond prescribed tolerance. This leads to voltage instability that may cause blackouts.  Automatic Voltage Regulator (AVR) is an important concept for keeping the voltages of the power system at rated value. AVR works on excitation control principle of synchronous generator. A good AVR needs a controller for proper performance. Active Disturbance Rejection Controller (ADRC) is a latest controller that eliminates any disturbance present thereby giving better performance. Here an ADRC is designed and applied for AVR of a single area power system. The simulation results justify the use of ADRC. Also ADRC and PID controller performances are compared.

 

Index Terms

Voltage stability, excitation control, automatic voltage regulator, active disturbance rejection controller, extended state observer

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AVR with ADRC

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Frequency Response Analysis for New Magnetic Power Transformer Composite Crystalline Core

Abstract

Characterization of composite materials is an important topic in modern electromagnetics, thus, suggested new microstructure electromagnetics materials that will be enable to realize enhancing the electromagnetic properties of transformer core and its characterization has been studied in this paper. This paper also presents a theoretical analysis to study the effective permeability prediction of the suggested magnetic composite  materials with adding various types and percentages of particles (Fe, Silicon steels, Metglas, Co-Fe, Ni-Fe, MnZn, MgZn, NiZn) for formulating new magnetic composite transformer core  materials. Theoretical analysis is introduced to study the influence of inclusion types and their concentration on the permeability. Numerical results show that significant aberration of inclusion types and their concentration on the effective permeability with respect to conventional magnetic materials. Frequency Response Analysis (FRA) is used to investigate transformer core magnetic composites and specifying enhancing magnetic effective complex relative permeability of transformer core magnetic composites with respect to variant frequencies (10-2Hz – 103Hz).

 

Index Terms

Magnetic Composites, Particles, Transformer Core, Permeability, Magnetism.

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Frequency Response Analysis for New Magnetic Power Transformer Composite Crystalline Core

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Performance Analysis of Diode Clamped 3 Level MOSFET Based Inverter

Authors: Dnyaneshwar D. Khairnar and V. M. Deshmukh


Abstract

At present, multilevel inverters are extensively used in industries for high power and high voltage applications. Two categories into which inverters can be broadly classified are two level inverters and multilevel inverters. The multilevel began with the three level converters. One advantage that multilevel inverters have compared to two level inverters is minimum harmonic distortion. This paper deals with study and analysis of three level diode clamped MOSFET based inverters and its applications in industries. The main purpose of the paper is to study and implement 3 level diode clamped inverter using MOSFET’s, the PWM signals used to switch these MOSFET’s has been generated using PWM IC HEF4752VP. However, the output voltage is smoother with a three level converter, these results in smaller harmonics, but on the other hand it has more components and it is little complex to control in hardware.

 

Index Terms

Multilevel, diode clamped, MSFET, PWM, harmonics

 

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Performance Analysis of Diode Clamped 3 Level MOSFET Based Inverter

 

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