Time filter

Source Type

Purwahyudi B.,Sepuluh Nopember Institute of Technology | Purwahyudi B.,Bhayangkara University of Surabaya | Soebagio,Sepuluh Nopember Institute of Technology | Ashari M.,Sepuluh Nopember Institute of Technology
International Journal of Power Electronics and Drive Systems | Year: 2011

Speed control of induction motor can be obtained by closed loop system which require speed sensor. Speed sensor system is less effective for wide plant system, because the sensor location is too far from the main control system and measurement result is less accurate. This paper presents the development of speed sensorless field oriented control (FOC) of induction motor by using the rotor flux and speed observers. The observers only required the stator voltage and current of induction motor to obtain the rotor flux and speed estimation. The observers based on recurrent neural network (RNN) methods are implemented. Finally, the effectiveness of the proposed method is verified by simulation. Simulation results show that RNN observer can produce well the rotor flux and speed estimation. MSE values of the rotor flux estimation are between 0.000087 and 0.000264, whereas MSE values of the speed estimation are between 43.0552 and 156.0798.


Suprobo P.,Sepuluh Nopember Institute of Technology | Aji P.,Sepuluh Nopember Institute of Technology | Ghozi M.,Bhayangkara University of Surabaya
Proceedings of the 13th East Asia-Pacific Conference on Structural Engineering and Construction, EASEC 2013 | Year: 2013

A new optimization procedure for designing a steel frame structure is presented in this paper. A repaired or "modified" chromosome in genetic algorithm is intoduced in the optimization procedure. The proposed method is applied to two stuctural models. The first model is a three storey ordinary steel structure moment frame designed according to AISC-ASD, while the second one is a three storey eccentrically steel braced frame designed according to AISC-LRFD. From the analysis carried out, it is concluded that the optimization process of using repaired chromosome in the genetic algorithms results a better solution than an ordinary genetic algorithms. The new proposed method is more stable, reliable and faster in computing process; furthermore, it gives a lighter or less structural weight.


Saidah,Sepuluh Nopember Institute of Technology | Saidah,Bhayangkara University of Surabaya | Hery Purnomo M.,Sepuluh Nopember Institute of Technology | Ashari M.,Sepuluh Nopember Institute of Technology
International Review of Electrical Engineering | Year: 2013

Nonlinear property of Active rectifier is caused by the use of the semiconductor switches, resulting in high harmonic distortion and high ripple output voltage on the DC side. This research develops a nonlinear controller to improve performance of the dc output voltage and line current based on feedback linearization. This controller mathematically transform nonlinear system dynamics into fully linear ones, so that linear control techniques can be applied. It is designed with selecting energy function on DC side and quadrature-axis current on AC side as output variables, in order to avoid the internal dynamics, so that the system becomes stable and robust. The system applies switch function of time as the input of control strategy, instead of current and voltage in d-q frame. The proposal is validated through different tests. These tests include difference performance with conventional controller (PI optimized). The simulation results in that the output voltage performing without any overshoot, while the ripple and settling time is 0.006 sec, which is better result compared to PI optimized. © 2013 Praise Worthy Prize S.r.l. - All rights reserved.


Saidah,Sepuluh Nopember Institute of Technology | Saidah,Bhayangkara University of Surabaya | Hery Purnomo M.,Sepuluh Nopember Institute of Technology | Ashari M.,Sepuluh Nopember Institute of Technology
Journal of Theoretical and Applied Information Technology | Year: 2012

Power Semiconductor switches of active rectifier are characterized by highly nonlinear property, resulting in high harmonic distortion and high ripple voltage on the DC side. This paper presents advanced control using switch function and fuzzy logic for compensating nonlinear behaviour. The system applies switch function of time as the input of control strategy, instead of current and voltage in d-q frame. The fuzzy logic controller aims to minimize DC voltage deviation by regulating the line current amplitude. This system uses minimum number of sensors, which is the voltage only to avoid the effect of sensor nonlinearity to the system. This performance is demonstrated and compared with PI-optimized controller. Simulations result have been conducted for variation values of capacitance, inductance and loads. The results show that the harmonic distortion and the ripple voltage on the DC side are 0.036% compared PIoptimized controller as 5.64%. © 2005 - 2012 JATIT & LLS. All rights reserved.


Amirullah,Sepuluh Nopember Institute of Technology | Amirullah,Bhayangkara University of Surabaya | Penangsang O.,Sepuluh Nopember Institute of Technology | Soeprijanto A.,Sepuluh Nopember Institute of Technology
Telkomnika (Telecommunication Computing Electronics and Control) | Year: 2016

Objective of research is to analyze the influence of solar irradiance and integration of photovoltaic (PV) generator to power quality of three phase grid on the constant temperature and load, based on changes in some level of integration of PV generator. Power quality aspects studied are fluctuation or changing, and harmonics of voltage and current on eight scenarios PV generator connected to three-phase grid, using passive filter circuit model double band pass (double tuned). Research shows that voltage and current values on the PCC bus before use double tuned passive filter on the condition only connect single generator is still stable. However, if the PV generator connected to the three phase grid, amounted to more than one generation, voltage and current grid becomes unstable (fluctuation). At the level of solar radiation remains, the greater number of PV generators connected to the grid threephase, then the values of voltage and current THD increases. At the level of solar irradiance increases, average THD of voltage and current grid also increased. Avarage THD of voltage and current grid is reduced after double tuned passive filter installed. Therefore, double tuned passive filter able to improve profile of voltage and current THD grid as a result of the integration of a number of PV power generators in three-phase grid according IEEE Standard 519-1992. © 2016 Universitas Ahmad Dahlan.


Purwahyudi B.,Sepuluh Nopember Institute of Technology | Purwahyudi B.,Bhayangkara University of Surabaya | Suryoatmojo H.,Sepuluh Nopember Institute of Technology | Ashari S.M.,Sepuluh Nopember Institute of Technology | Hiyama T.,Kumamoto University
International Journal of Innovative Computing, Information and Control | Year: 2011

PI controllers have been widely used in industrial systems application, because they have a simple structure and offer a satisfactory performance for a wide range operation. However, for varieties of plant parameters and the nonlinear operating condition, fixed gain PI controllers cannot provide the desired control performance. In this paper, advanced PI controller was utilized to control the speed of the induction motor in Direct Torque Control (DTC) for electric propulsion application. The proposed method is developed from conventional PI controller combined with feed-forward neural networks (FFNN). The FFNN is used to tune the gain of PI controller. The effectiveness of the complete proposed control scheme is clarified with a variation of speed reference and load torque applied to the motor. Load torque of induction motor depends on the speed rotation and pitch of propeller. Simulation results show the FFNN tuning technique provides better speed control performance. © 2011 ICIC INTERNATIONAL.


Amirullah,Industrial Engineering Faculty | Amirullah,Bhayangkara University of Surabaya | Penangsang O.,Industrial Engineering Faculty | Soeprijanto A.,Industrial Engineering Faculty
2015 International Seminar on Intelligent Technology and Its Applications, ISITIA 2015 - Proceeding | Year: 2015

Objective of research is to analyze the influence of the photovoltaic (PV) generator installation to power quality on distribution network. There are two models of load distribution network, namely industrial and residential costumers distribution network. Reseach show that the value of bus voltage THD on distribution network of industrial and residential customers are still under of voltage THD limit recomended by IEEE 519-1992 equal as 5%. The majority of the value of TDD conductor in two models of the distribution network is under the limit conductor current TDD recommended by IEEE 519-1992. In network industries and residential customers, the more number of PV plants installed, then the value of current harmonic (TDD) at PCC bus will be even greater. The most value of conductor current TDD average generated by conductor that is connected directly to the PV generator bus The using of single tuned passive filter able to improve THD Bus and TDD conductor which still does not meet the standart requirements. © 2015 IEEE.


Ghozi M.,Bhayangkara University of Surabaya | Budiati A.,Bhayangkara University of Surabaya
International Journal of Applied Engineering Research | Year: 2016

Optimization process have been the main problem for civil engineer and designer. The problem comes with how to accommodating specific ready stock WF Profile, SNI 1729-2015 Indonesian steel design code and SNI 1726-2012 Indonesian earthquake design code. In this paper, the problems is solved with combination of Chromosome Repairing (CR)-Genetic Algorithm (GA)-Finite Element Method (FEM) and then verified with commercial FEM program. The structure’s weight model is 29050 Kg which remain not to violate all predefined Indonesian constraints. It is concluded that combined GACR-FEM successfully provide optimized Indonesian steel structure. © Research India Publications.


Ghozi M.,Bhayangkara University of Surabaya
International Journal of Applied Engineering Research | Year: 2015

Harmony search (HS) method is widely used for solving steel structureoptimization problems but HS also has weakness and ineffectivenes. In this paper the performance of HS will be inreased by adding sorting module for optimizing steel structure based on AISC360-05 code, drift and Wide Flange (WF) profile arrangement constraints. The optimization process is run 20 times using modified HS and compared with HS method. This research results that ModifiedHS can find structure 12.8% lighter than HS and saves 73% iteration than HS. It is concluded that Modified HS is faster and lighter than pure HS for optimizing steel structure. © Research India Publications.

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