In this paper, the fuzzy logic controller flc based power system stabilizer pss with compressedreduced rule is presented. A hybrid fuzzy logic proportionalintegralderivative and conventional onoff controller for morphing wing actuation using shape memory alloy part 1. Fuzzy logic controllers are based on empirical control rules. Adaptive fuzzy sliding mode power system stabilizer using. Remarkable research effort has been done in the last decade to put forward intelligent fuzzy logic based power system stabilizer pss as well.
Development of fuzzy logic based power system stabilizer figure 6. Abstract this paper presents some interesting simulation results of a single machine infinitebus system, with fuzzy logic based power system stabilizer flpss. Accompanied by suitable membership functions, the rulebase is a core ingredient of any fuzzy rulebased expert system. The flc rule base is generally based on empirical control rules. Whether a physical system, logic or conceptual, the truth is. Fuzzy logic provides mathematical strength to the emulation of certain. This section discusses the applications based on the particular fuzzy method used. A1jis a one of the fuzzy set of the fuzzy partition for x1 a2kis a one of the fuzzy set of the fuzzy partition for x2 om i is a one of the fuzzy set of the fuzzy partition for y for a given pair of crisp input values x1 and x2 the antecedents are the degrees of membership obtained during. The development of a fuzzy logic based power system stabilizer in order to maintain stability and enhance the closedloop performance of a power system is described in this paper.
Design of fuzzy logic controller based power system. It is based on the implementation of fuzzy logic technique to pss to improve system damping. Malik, selftuned power system stabilizer based on a simple fuzzy logic controller, electr. Which gives the discrete fuzzy centroid, the output of.
Machine model, automatic voltage regulator avr, power. Optoelectronic technology and instruments, control theory and automation, and space exploration, 71291m october 2008. Fuzzy logic provides an inference structure that enables the human reasoning capabilities to be applied to arti. Fuzzy logic, fuzzy logic controller flc and temperature control system. A comparative study between mamdani and sugeno fuzzy logic designs on one hand and conventional power system stabilizers on the other hand is presented. What might be added is that the basic concept underlying fl is that of a linguistic variable, that is, a variable whose values are words rather than numbers. This tutorial begins with a general section on fuzzy logic techniques and methods. Ensuring the efficiency and robustness of a power system stabiliser is indebted to provide a comprehensive scheme that considers significant uncertainties in variables and parameters of the model. Introduction to fuzzy logic control with application to. Applications of fuzzy set theory 9 9 fuzzy logic and approximate reasoning 141 9. Design of interval type2 fuzzy logic based power system. In this paper, a new stable fuzzy wavelet neuralbased adaptive power system stabilizer sfwnapss for damping low frequency oscillations in a multimachine power system is proposed. Application of bat algorithm to optimize scaling factors of fuzzy. Zadeh, professor for computer science at the university of california in berkeley.
In fuzzy logic toolbox software, fuzzy logic should be interpreted as fl, that is, fuzzy logic in its wide sense. The effectiveness of the fuzzy logic pss in a single. A multimachine power system stabilizer using fuzzy logic controller 1dr. The performance of the system with fuzzy logic based power system stabilizer is compared with the system having conventional power system stabilizer and system without power system stabilizer. The simulation result shows that the proposed fuzzy logic based power system stabilizer is superior to rulebased stabilizer due. Design of a fuzzylogiccontrolbased robust power system. Balasubramanyam abstract the modern interconnected power systems have a tendency to oscillate under certain loading and systememploying conditions. A collection of such rules is referred to as a rulebase. Due to the use of linguistic variables and fuzzy rules, the system can be made understandable to a nonexpert operator. Pdf a fuzzy logic based adaptive power system stabilizer. Due to the need for a large rulebase, the design of such a pss is a tedious task. The essential part of the fuzzy logic controller is a set of linguistic control.
Compared to classical control, the fl advantage is the possibility of its application in absence of the mathematical model. Since power systems are highly nonlinear systems, with configurations and parameters that change with time, the cpss design based on the linearised model of. Performance of power system stabiliser based on fuzzy. Digital simulation of reduced rule fuzzy logic power.
Power system stability enhancement using fuzzy logic based. An interval type2 fuzzy logic controller it2flc is proposed in this paper for the design of power system stabilizer pss of a single machine infinite. The performance of the fuzzy logic power system stabilizer was compared with the conventional power system stabilizer and without power system stabilizer. Power system stability is enhanced through a novel stabilizer developed around an adaptive fuzzy sliding mode approach which applies the nussbaum gain to a nonlinear model of a singlemachine infinitebus smib and multimachine power system stabilizer subjected to a three phase fault. Fuzzy control is based on fuzzy logica logical system that is much closer in spirit to human thinking and natural language than. Power system stabilizer design using compressed rule base of fuzzy logic controller free download abstract. The fuzzy logic based power system stabilizer model i s evaluated on single machine infinite bus power system and then performed between the conventional power system stabilizer cpss and fuzzy logic based power system stabilizer flpss. Multimachine, power system stabilizers, sliding mode control. Robust adaptive fuzzy logic power system stabilizer. Keywordsinterval type2 fuzzy logic, power system stabilizer. Design of robust fuzzy logic power system stabilizer core.
Most psss in use in electric power systems employ the classical linear control theory approach based on a linear model of a fixed configuration of the power. Controller design in fractional mode, discrete systems, application of fractional order controllers. A comparison is also made between the flpss and conventional power system stabilizer cpss. Comparison of fuzzy logic based and conventional power. For fuzzy logic based power system stabilizer, the supplementary stabilizing signal is determined according to the fuzzy membership function depending on the speed and acceleration states of the generator. Pdf simulation of fuzzy logic power system stabilizer. Introduction lectrical power system generally consists of some generating unit, transmission line, and load center. Hui zhao, luyuan liu, hongjun wang, and youjun yue design of a fuzzylogiccontrolbased robust power system stabilizer, proc. Fuzzy logic based power system stabilizer has two input variables and one output variable. Fuzzy logic controller as a power system stabilizer citeseerx. This study proposes a robust typeii fuzzy logicbased power system stabiliser scheme that can handle the uncertainties in both loading condition and line parameters.
In this paper a novel robust fuzzy logic power system stabilizer rflpss design is proposed the rflpss basically utilizes only one measurable. Application of artificial intelligent techniques in pss design. Fuzzy logic as complexity rises, precise statements lose meaning and meaningful statements lose precision. Performance of power system stabiliser based on fuzzy logic control m. The present work proposes a hybridfuzzy logic power system stabilizer hflpss with optimal parameters, systematically tuned using differential evolution algorithm approach. Fuzzy set theoryand its applications, fourth edition. Robust design of fuzzybased power system stabiliser.
A hybrid fuzzy logic proportionalintegralderivative and. Since the method is based on a linearised model and the. Fuzzy logic controller as a power system stabilizer. Such a fuzzy logic power system stabilizer is developed. Fuzzy relations can be represented linguistically by natural language statements in the form of fuzzy ifthen rules. The input variables are rotor speed deviation and acceleration. R department of instrumentation and control systems engineering, psg college of technology, coimbatore, 641004, india.
Application of bat algorithm to optimize scaling factors. Design of this controller is based on a tsk fuzzy model so that the consequent parts of fuzzy rules are constructed using a selfrecurrent wavelet neural network. Enhancement of power system stability using fuzzy logic. The series of control rules in fuzzy logic approach is to cover n. The proposed fuzzy logic power system stabilizer can be configured by using a microcomputer and an ad and a da conversion boards, and easily implemented in power systems. The basic ideas underlying fl are explained in foundations of fuzzy logic. A fuzzy control system is a control system based on fuzzy logica mathematical system that analyzes analog input values in terms of logical variables that take on continuous values between 0 and 1, in contrast to classical or digital logic, which operates on discrete values. Fuzzy logic controllers have successfully applied in control applications, they are subjective and heuristic. To enhance the performance of power system stabilizer, robust fuzzy power system stabilizer rfpss has been proposed. Result presented in the paper clearly demonstrates fuzzy logic based power system stabilizer flpss in. Possible definition of the set kljk ohyhov in the tank in fig.
The disturbances may be of local mode having frequency. Fuzzylogic based power system stabilizer in the design of fuzzylogic controllers, unlike most conventional methods, a mathematic model is not required to describe the system under study. Pdf a fuzzy logic based discrete mode power system. Performance assessment of fuzzy logic based power system. S department of instrumentation and control systems engineering, psg college of technology. Introduction low cost temperature control using fuzzy logic system block diagram shown in the fig. Spie 7129, seventh international symposium on instrumentation and control technology. To achieve good damping characteristics over a wide range of operating conditions, speed deviation and acceleration of a synchronous machine are chosen as the input. Design of robust fuzzy logic power system stabilizer. In this paper a novel robust fuzzy logic power system stabilizer rflpss design is proposed the rflpss basically utilizes only one measurable signal as. The first step in designing a fuzzy logic power system stabilizer flpss is to decide which state variables. Tutorial on fuzzy logic applications in power systems. A fuzzylogicbased adaptive power system stabilizer pss is proposed in this paper. Robust design of fuzzybased power system stabiliser considering uncertainties of loading conditions and transmission line parameters.
This paper investigates the performance of fuzzy logic based power system stabilizer in damping the local modal oscillations of an interconnected power system. A conventional power system stabilizer can provide adequate damping for a limited range around its tuning point. In this way, fuzzy logic can be used as a general methodology to incorporate knowledge, heuristics or theory into controllers and decisionmakers. This can be overcome by an intelligent nonlinear pss based on fuzzy logic. The nussbaum gain is used to avoid the positive sign constraint and the problem of controllability of. In this paper a fuzzy logic controller as power system stabilizer for stability enhancement of a multimachine power. The system generally has sufficient inherent damping to counteract this instability. In contrast to conventional power system stabilize which is designed in frequency domain, a fuzzy logic power system stabilizer is designed in the time domain. Pdf fuzzy logic based power system stabilizer for multimachine. Direct adaptive power system stabilizer design using fuzzy. The conventional power system stabilizers work well at the particular network configuration and steady state conditions for which they were designed. Fuzzy logic based power system stabilizer for multimachine system. Dynamic stability enhancement of power system using fuzzy logic. Saying that the theory of fuzzy sets is a generalization of the.
Table 3 is a list of the more common application areas. The fault is always occurred in the electrical power system, whether it is a permanent one or temporary one. The parameters of the fuzzylogicbased pss are tuned by neural networks online. Morphing system mechanisms and controller architecture design volume 116 issue 1179 t. Fuzzy logic provides a means for converting linguistic strategy into control actions and thus o. Design of fuzzy logic controller based power system stabilizer and compare with conventional power system stabilizer. As in refs 15, 30, 31, the power system stabilizers can be designed. Performance of power system stabilizerusing fuzzy logic.
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