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Tuning Method (tuning + method)

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Engineering100%

Selected Abstracts

A study on a new AVR parameter tuning concept using on-line measured data with the real-time simulator

EUROPEAN TRANSACTIONS ON ELECTRICAL POWER, Issue 3 2006
Joong-Moon Kim
Abstract Automatic voltage regulator (AVR) parameter tuning for voltage control of power system generators has generally been performed with the analytic methods and the simulation methods, which mostly depend on off-line linear mathematical models of power system. However, due to the nonlinear nature of power system, the mathematical models of the excitation system may not be correct. So the excitation control system performances with the parameter set that is tuned by using the mathematical model, may not be appropriate for some operating conditions. This paper presents an AVR parameter tuning method using on-line measured data of the excitation control system with parameter optimization technique. As this method utilizes on-line operating data, it can overcome the limitation of model uncertainty problems of conventional method. To validate the proposed tuning concept, a scaled model excitation system is connected to the real-time power system simulator, and the proposed tuning concept is tested. Copyright © 2006 John Wiley & Sons, Ltd. [source]

Improvement of interactions among facts controls

EUROPEAN TRANSACTIONS ON ELECTRICAL POWER, Issue 5 2000
X. Lei
Interaction among the FACTS (flexible AC transmission systems) devices in a multi-machine system can adversely influence the damping properties of individual FACTS devices. In some critical cases, it may even amplify power swings or increase voltage deviations. This paper presents a global tuning method for the FACTS controllers in a multi-machine system. Based on a non-linear optimization algorithm implemented in a simulation program, the parameter settings of the FACTS controllers involved can be simultaneously optimized at transient conditions in coping with the non-linear nature of the power system. By minimizing a non-explicit target function in which swing characteristics between areas are included, interactions among the FACTS controls at transient conditions in the multi-machine system are minimized. Two multi-machine power systems equipped individually with a TCSC (thyristor-controlled series compensator) and a SVC (static Var compensator) are applied to demonstrate the efficiency of the proposed tuning procedure. The results obtained from simulations validate the improvement in damping of overall power oscillations. The simulations also show that the optimized FACTS controllers are robust in providing adequate damping for a range of conditions on the system. [source]

Developments of fuzzy PID controllers

EXPERT SYSTEMS, Issue 5 2005
H. B. Kazemian
Abstract: This paper describes the development and tuning methods for a novel self-organizing fuzzy proportional integral derivative (PID) controller. Before applying fuzzy logic, the PID gains are tuned using a conventional tuning method. At supervisory level, fuzzy logic readjusts the PID gains online. In the first tuning method, fuzzy logic at the supervisory level readjusts the three PID gains during the system operation. In the second tuning method, fuzzy logic only readjusts the proportional PID gain, and the corresponding integral and derivative gains are readjusted using the Ziegler,Nichols tuning method while the system is in operation. For the compositional rule of inferences in the fuzzy PID and the self-organizing fuzzy PID schemes two new approaches are introduced: the min implication function with the mean of maxima defuzzification method, and the max-product implication function with the centre of gravity defuzzification method. The fuzzy PID controller, the self-organizing fuzzy PID controller and the PID controller are all applied to a non-linear revolute-joint robot arm for step input and path tracking experiments using computer simulation. For the step input and path tracking experiments, the novel self-organizing fuzzy PID controller produces a better output response than the fuzzy PID controller; and in turn both controllers exhibit better process output than the PID controller. [source]

Wavelength tuning using an arrayed waveguide gratings demultiplexer

MICROWAVE AND OPTICAL TECHNOLOGY LETTERS, Issue 3 2009
Gaozhi Xiao
Abstract A novel wavelength tuning method using a specially designed arrayed waveguide gratings (AWG) demultiplexer was demonstrated. It was found that the transmission wavelengths of the AWG channels change linearly with the scanning of the input fiber along the facet of the input coupler of the AWG device. Initial results showed that more than 35 nm tuning range can be achieved at resolution of picometer. Optical spectra measurement using this novel wavelength tuning method is also reported. © 2009 Wiley Periodicals, Inc. Microwave Opt Technol Lett 51: 693,696, 2009; Published online in Wiley InterScience (www.interscience.wiley.com). DOI 10.1002/mop.24145 [source]