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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. Source


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. Source


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. Source


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. Source


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. Source

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