Pub Date : 2017-07-01DOI: 10.1109/QIR.2017.8168488
A. A. P. Ratna, Randy Sanjaya, Tomi Wirianata, Prima Dewi Purnamasari
Assessment is an important step in the learning process in which the assessor evaluates students' level of understanding. One model of assessment is essay, which may cause problems in scoring objectivity and performance drop of human body when grading many essays. To ease essay grading and resolve those problems, a system that can assess documents according to its contexts is needed. From this concern, we developed a Java-based system for grading essays in Indonesian language using a more efficient and optimal algorithm. This algorithm consisted of 4 stages. The first stage is Latent Semantic Analysis (LSA), which is used to obtain and conclude the contextual relation of words meaning in a text. The second stage uses Single Value Decomposition (SVD) to obtain scatter variance from the relations. SVD identifies where variances appear at most, therefore is enabled to find the best approach to the original data using reduced dimensions. The third stage is Latent Semantic Indexing (LSI) which is an indexing and retrieval method to identifies patterns in relation between terms and concepts contained in unstructured text collection and results with a vector representing the text. The last stage is Cosine Similarity Measurement (CSM) to obtain similarity value from the text and answer document. To resolve problems stemmed from grammar and vocabulary, in this work we propose an auto-correction technique to check a word from word library for equalization of word with same or no specific meaning. Then, Jaro-Winkler distance algorithm is used to check word errors caused by accident when typing. With the distance, we can determine whether two strings of word are similar. This is extremely important when scanning text with typos, as it will affect the result from LSA. Using this system, the value obtained is similar to the value obtained from human rater. With word library consisting of 97 words for synonym check and 204 function words, the resulting accuracy is 85.246% ± 13.129.
{"title":"Word level auto-correction for latent semantic analysis based essay grading system","authors":"A. A. P. Ratna, Randy Sanjaya, Tomi Wirianata, Prima Dewi Purnamasari","doi":"10.1109/QIR.2017.8168488","DOIUrl":"https://doi.org/10.1109/QIR.2017.8168488","url":null,"abstract":"Assessment is an important step in the learning process in which the assessor evaluates students' level of understanding. One model of assessment is essay, which may cause problems in scoring objectivity and performance drop of human body when grading many essays. To ease essay grading and resolve those problems, a system that can assess documents according to its contexts is needed. From this concern, we developed a Java-based system for grading essays in Indonesian language using a more efficient and optimal algorithm. This algorithm consisted of 4 stages. The first stage is Latent Semantic Analysis (LSA), which is used to obtain and conclude the contextual relation of words meaning in a text. The second stage uses Single Value Decomposition (SVD) to obtain scatter variance from the relations. SVD identifies where variances appear at most, therefore is enabled to find the best approach to the original data using reduced dimensions. The third stage is Latent Semantic Indexing (LSI) which is an indexing and retrieval method to identifies patterns in relation between terms and concepts contained in unstructured text collection and results with a vector representing the text. The last stage is Cosine Similarity Measurement (CSM) to obtain similarity value from the text and answer document. To resolve problems stemmed from grammar and vocabulary, in this work we propose an auto-correction technique to check a word from word library for equalization of word with same or no specific meaning. Then, Jaro-Winkler distance algorithm is used to check word errors caused by accident when typing. With the distance, we can determine whether two strings of word are similar. This is extremely important when scanning text with typos, as it will affect the result from LSA. Using this system, the value obtained is similar to the value obtained from human rater. With word library consisting of 97 words for synonym check and 204 function words, the resulting accuracy is 85.246% ± 13.129.","PeriodicalId":225743,"journal":{"name":"2017 15th International Conference on Quality in Research (QiR) : International Symposium on Electrical and Computer Engineering","volume":"15 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130056356","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-01DOI: 10.1109/QIR.2017.8168451
A. Narottama, A. Sapteka
In this paper, we report the simulation of high doping nanoscale heterojunction diode, particularly Si1−xGex/Si p-n diode, using Cogenda Visual TCAD. In order to gain knowledge on electrical properties of this diode, we exhaustively simulate the effect of Ge mole fraction in SiGe material on current, voltage and electric field characteristics. The simulation covers Ge mole fraction of 0.2 to 0.7 in SiGe material as acceptor and Si material as donor. Both acceptor and donor have concentrations of 1020 per cm3 and areas of 10 × 10 nm2. Under forward bias voltage, higher Ge mole fraction will produce higher current. This phenomenon happens due to lower energy band gap at higher Ge mole fraction condition. Besides that, higher Ge mole fraction has lower energy difference between P side and N side of diode. According to the simulation result, Si0.8Ge0.2 has energy band gap about 0.8 eV, meanwhile Si0.3Ge0.7 has energy band gap about 0.5 eV. Lower energy band gap causes more electrons have enough energy to cross the junction. Meanwhile under reverse bias voltage, high doping nanoscale diode will produce infinitesimal current. At the junction, high doping nanoscale Si1−xGex/Si P-N diode also has lower electric field (measured at the center of diode) at higher Ge mole fraction. Under reverse bias voltage of −2 V, Si0.3Ge0.7 has maximum electric field about 5.89 × 106 V/m, meanwhile Si0.8Ge0.2 has maximum electric field about 6.17 × 106 V/m. We predict that Ge mole fraction has inversely proportional effect to the maximum electric field value. Therefore, we concluded that Ge mole fraction affects current, voltage and electric field characteristics of high doping nanoscale Si1−xGex/Si P-N diode.
{"title":"Effect of Ge mole fraction on current, voltage and electric field characteristics of high doping nanoscale Si1−xGex/Si p-n diode","authors":"A. Narottama, A. Sapteka","doi":"10.1109/QIR.2017.8168451","DOIUrl":"https://doi.org/10.1109/QIR.2017.8168451","url":null,"abstract":"In this paper, we report the simulation of high doping nanoscale heterojunction diode, particularly Si<inf>1−x</inf>Ge<inf>x</inf>/Si p-n diode, using Cogenda Visual TCAD. In order to gain knowledge on electrical properties of this diode, we exhaustively simulate the effect of Ge mole fraction in SiGe material on current, voltage and electric field characteristics. The simulation covers Ge mole fraction of 0.2 to 0.7 in SiGe material as acceptor and Si material as donor. Both acceptor and donor have concentrations of 10<sup>20</sup> per cm<sup>3</sup> and areas of 10 × 10 nm<sup>2</sup>. Under forward bias voltage, higher Ge mole fraction will produce higher current. This phenomenon happens due to lower energy band gap at higher Ge mole fraction condition. Besides that, higher Ge mole fraction has lower energy difference between P side and N side of diode. According to the simulation result, Si<inf>0.8</inf>Ge<inf>0.2</inf> has energy band gap about 0.8 eV, meanwhile Si0.3Ge0.7 has energy band gap about 0.5 eV. Lower energy band gap causes more electrons have enough energy to cross the junction. Meanwhile under reverse bias voltage, high doping nanoscale diode will produce infinitesimal current. At the junction, high doping nanoscale Si<inf>1−x</inf>Ge<inf>x</inf>/Si P-N diode also has lower electric field (measured at the center of diode) at higher Ge mole fraction. Under reverse bias voltage of −2 V, Si<inf>0.3</inf>Ge<inf>0.7</inf> has maximum electric field about 5.89 × 10<sup>6</sup> V/m, meanwhile Si<inf>0.8</inf>Ge<inf>0.2</inf> has maximum electric field about 6.17 × 10<sup>6</sup> V/m. We predict that Ge mole fraction has inversely proportional effect to the maximum electric field value. Therefore, we concluded that Ge mole fraction affects current, voltage and electric field characteristics of high doping nanoscale Si<inf>1−x</inf>Ge<inf>x</inf>/Si P-N diode.","PeriodicalId":225743,"journal":{"name":"2017 15th International Conference on Quality in Research (QiR) : International Symposium on Electrical and Computer Engineering","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133460567","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-01DOI: 10.1109/QIR.2017.8168500
Y. Ohira, Yoyok Dwi Setyo Pambudi, C. Hudaya
The Indonesian government (GoI) applies the cost recovery concept in the upstream sector of the oil and gas resources. It postulates the expenses spent by the contractor during exploration and exploitation activities will be settled through production sharing scheme. The cost includes the compensation for the production equipment and utilities, not to mention the power generator. When the oil-and-gas exploitation declines or even shut-in due to technical and economic reasons, some of them become idle assets. In this study, we investigate the utilization of the idle 2 × 750 kVA gas engine power generators for a new gas facilities project in different region. As the newly facilities require a smaller power supply (2 × 350 kVA) than the power plant capacity, the excess power is proposed to be sold to the electric utility. Here, an economic analysis is carried out to compare between purchasing new power generators and the utilization of the idle ones. The result shows that the utilization of idle asset provides economic benefit both for the GoI and the contractor. This scheme will solve the electricity need for own use and the excess power may be transferred to the electric utility, realized by power purchase agreement.
{"title":"Utilization of idle power plant for own use and excess power in an oil-and-gas company","authors":"Y. Ohira, Yoyok Dwi Setyo Pambudi, C. Hudaya","doi":"10.1109/QIR.2017.8168500","DOIUrl":"https://doi.org/10.1109/QIR.2017.8168500","url":null,"abstract":"The Indonesian government (GoI) applies the cost recovery concept in the upstream sector of the oil and gas resources. It postulates the expenses spent by the contractor during exploration and exploitation activities will be settled through production sharing scheme. The cost includes the compensation for the production equipment and utilities, not to mention the power generator. When the oil-and-gas exploitation declines or even shut-in due to technical and economic reasons, some of them become idle assets. In this study, we investigate the utilization of the idle 2 × 750 kVA gas engine power generators for a new gas facilities project in different region. As the newly facilities require a smaller power supply (2 × 350 kVA) than the power plant capacity, the excess power is proposed to be sold to the electric utility. Here, an economic analysis is carried out to compare between purchasing new power generators and the utilization of the idle ones. The result shows that the utilization of idle asset provides economic benefit both for the GoI and the contractor. This scheme will solve the electricity need for own use and the excess power may be transferred to the electric utility, realized by power purchase agreement.","PeriodicalId":225743,"journal":{"name":"2017 15th International Conference on Quality in Research (QiR) : International Symposium on Electrical and Computer Engineering","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130639911","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-01DOI: 10.1109/QIR.2017.8168493
Muhammad Fathur Rahman, S. Manjang, Z. Zainuddin
The authors proposed a method for measuring the water level in open channel which is accurate, low cost, and simple. Getting the accurate measurement in open channel is more difficult than in closed channel because there is an influence of external factors such as the formation of the wave, irregular channel structures and floating objects on the water surface. To resolve those problems, a new sensor device is proposed that can measure the water level accurately and simply. The device consists of a combination of JSN-SR04T ultrasonic sensors and iron pipe, it is developed by using ATMEGA328 microcontroller system. The device can measure the water level changes accurately because in a state of stationary and flat. The comparison result between measuring visually and JSN-SR04T ultrasonic sensor is included. This device can record the results of sensor measurements in every second into the SD-card for the purpose of further analysis.
{"title":"Water level monitoring using ultrasonic-pipe in open channel","authors":"Muhammad Fathur Rahman, S. Manjang, Z. Zainuddin","doi":"10.1109/QIR.2017.8168493","DOIUrl":"https://doi.org/10.1109/QIR.2017.8168493","url":null,"abstract":"The authors proposed a method for measuring the water level in open channel which is accurate, low cost, and simple. Getting the accurate measurement in open channel is more difficult than in closed channel because there is an influence of external factors such as the formation of the wave, irregular channel structures and floating objects on the water surface. To resolve those problems, a new sensor device is proposed that can measure the water level accurately and simply. The device consists of a combination of JSN-SR04T ultrasonic sensors and iron pipe, it is developed by using ATMEGA328 microcontroller system. The device can measure the water level changes accurately because in a state of stationary and flat. The comparison result between measuring visually and JSN-SR04T ultrasonic sensor is included. This device can record the results of sensor measurements in every second into the SD-card for the purpose of further analysis.","PeriodicalId":225743,"journal":{"name":"2017 15th International Conference on Quality in Research (QiR) : International Symposium on Electrical and Computer Engineering","volume":"166 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133095048","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-01DOI: 10.1109/QIR.2017.8168491
Astriany Noer, Z. Hasanuddin, Dewiani Djamaluddin
This paper presents an innovation in the implementation of RFID in terms of authentication and offline intelligent payment system in public transport, Bus Rapid Transit (BRT), for the academicians. The authentication is conducted using a contactless smart card as an e-ticket as well as an identity card. Contactless smart cards can be obtained through the registration process on the administrator to store user's identity in specific sectors and provide classified authentication key for the card. Passengers will make the payment on a device that has been previously installed on the BRT, called Contactless Payment Terminal (CPT). CPT consists of Raspberry Pi 3 Model B, MFRC522 and LCD Waveshare 3.5. CPT works without requiring server communication when conducting the transaction, but rather accessing the data stored in the contactless card. The optimum range for the CPT can identify the data on the contactless card is at a distance of 1 cm and 2 cm with a percentage of 100%, the percentage decreased by 86.67% at a distance of 3 cm. The fastest delay time is 0.1 s at a distance of 1 cm and the longest is 2.7 s at a distance of 3 cm. The designed system is also equipped with a website operated by an administrator to register a new user, to edit the user's identity, to top up the user's balances, and to check the transaction history.
{"title":"Implementation of RFID based raspberry Pi for user authentication and offline intelligent payment system","authors":"Astriany Noer, Z. Hasanuddin, Dewiani Djamaluddin","doi":"10.1109/QIR.2017.8168491","DOIUrl":"https://doi.org/10.1109/QIR.2017.8168491","url":null,"abstract":"This paper presents an innovation in the implementation of RFID in terms of authentication and offline intelligent payment system in public transport, Bus Rapid Transit (BRT), for the academicians. The authentication is conducted using a contactless smart card as an e-ticket as well as an identity card. Contactless smart cards can be obtained through the registration process on the administrator to store user's identity in specific sectors and provide classified authentication key for the card. Passengers will make the payment on a device that has been previously installed on the BRT, called Contactless Payment Terminal (CPT). CPT consists of Raspberry Pi 3 Model B, MFRC522 and LCD Waveshare 3.5. CPT works without requiring server communication when conducting the transaction, but rather accessing the data stored in the contactless card. The optimum range for the CPT can identify the data on the contactless card is at a distance of 1 cm and 2 cm with a percentage of 100%, the percentage decreased by 86.67% at a distance of 3 cm. The fastest delay time is 0.1 s at a distance of 1 cm and the longest is 2.7 s at a distance of 3 cm. The designed system is also equipped with a website operated by an administrator to register a new user, to edit the user's identity, to top up the user's balances, and to check the transaction history.","PeriodicalId":225743,"journal":{"name":"2017 15th International Conference on Quality in Research (QiR) : International Symposium on Electrical and Computer Engineering","volume":"98 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131416477","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-01DOI: 10.1109/QIR.2017.8168482
M. Ramadiansyah, Wahidin Wahab, Nasril
The high precision Loading unloading robot under studied is one of the CNC Machines developed to support the Intra-ocular Eye-Lens manufacturing process. the Robot uses two DC Servo Motor as the actuators for the position control in cartesian coordinate. The desired specification of the Robot is of a very high accuracy which is reaching 10μm in high speed, such that it is necessary to understand the dynamic characteristic of the servo motors in the robot. Based on the physical modeling of the robot a set of high order transfer function is developed, and by conducting simulation using matlab, the effect of the increase in gain on the servo motor towards the respond of the system can be studied. The experiment on DC Servo Motor control using Aerotech Ensemble software will be conducted to find the incremental effect of each gain in the controller, and compared to the simulation result from Matlab. A good understanding of the controller behavior can be achieved in this paper, and the specific effect of each servo gain to obtained the desired specification can be learned, such that the manual setting of the gain on Robot controller can be done optimally.
{"title":"Modelling, simulation and control of a high precision loading-unloading robot for CNC milling machine","authors":"M. Ramadiansyah, Wahidin Wahab, Nasril","doi":"10.1109/QIR.2017.8168482","DOIUrl":"https://doi.org/10.1109/QIR.2017.8168482","url":null,"abstract":"The high precision Loading unloading robot under studied is one of the CNC Machines developed to support the Intra-ocular Eye-Lens manufacturing process. the Robot uses two DC Servo Motor as the actuators for the position control in cartesian coordinate. The desired specification of the Robot is of a very high accuracy which is reaching 10μm in high speed, such that it is necessary to understand the dynamic characteristic of the servo motors in the robot. Based on the physical modeling of the robot a set of high order transfer function is developed, and by conducting simulation using matlab, the effect of the increase in gain on the servo motor towards the respond of the system can be studied. The experiment on DC Servo Motor control using Aerotech Ensemble software will be conducted to find the incremental effect of each gain in the controller, and compared to the simulation result from Matlab. A good understanding of the controller behavior can be achieved in this paper, and the specific effect of each servo gain to obtained the desired specification can be learned, such that the manual setting of the gain on Robot controller can be done optimally.","PeriodicalId":225743,"journal":{"name":"2017 15th International Conference on Quality in Research (QiR) : International Symposium on Electrical and Computer Engineering","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115394126","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-01DOI: 10.1109/QIR.2017.8168481
I. Siradjuddin, Zakiyah Amalia, B. Setiawan, R. Wicaksono, E. Yudaningtyas
A cart inverted pendulum system is one of the most common case to be considered for testing many control algorithms, since it has some challenging problems associated with non linearity, complexity and underactuated system model. In fact, non-linearity behaviour of the inverted pendulum can be observed easily. Different pendulum angle response can be obtained by giving the same velocity in the cart. The cart inverted pendulum can be understood as an under actuated system since the system has a lower number of actuator than the degrees of freedom. One of the most convenient method to model the inverted pendulum system is to use Lagrange's equation. However, at present, many presented inverted pendulum models have been derived using simplified physical model. This simplified model may lead to problems for the implementation of the control algorithm in a real physical inverted pendulum system. In this paper, an inverted pendulum system model is presented, where a mechanical transmission system and a motor models have been included in the derivation of the inverted pendulum model. Hence, the problems for the control implementation in a real system can be minimized. The mathematical model of the inverted pendulum was derived using Lagrange's equation. The determination of the pole zero of the system is discussed. A simple method of pole placement is proposed to stabilise the pendulum at the desired position of the cart. Matlab simulation results show the effectiveness of the proposed method. And yet, this intuitive approach can lead to better understanding of the control behaviours.
{"title":"Stabilising a cart inverted pendulum system using pole placement control method","authors":"I. Siradjuddin, Zakiyah Amalia, B. Setiawan, R. Wicaksono, E. Yudaningtyas","doi":"10.1109/QIR.2017.8168481","DOIUrl":"https://doi.org/10.1109/QIR.2017.8168481","url":null,"abstract":"A cart inverted pendulum system is one of the most common case to be considered for testing many control algorithms, since it has some challenging problems associated with non linearity, complexity and underactuated system model. In fact, non-linearity behaviour of the inverted pendulum can be observed easily. Different pendulum angle response can be obtained by giving the same velocity in the cart. The cart inverted pendulum can be understood as an under actuated system since the system has a lower number of actuator than the degrees of freedom. One of the most convenient method to model the inverted pendulum system is to use Lagrange's equation. However, at present, many presented inverted pendulum models have been derived using simplified physical model. This simplified model may lead to problems for the implementation of the control algorithm in a real physical inverted pendulum system. In this paper, an inverted pendulum system model is presented, where a mechanical transmission system and a motor models have been included in the derivation of the inverted pendulum model. Hence, the problems for the control implementation in a real system can be minimized. The mathematical model of the inverted pendulum was derived using Lagrange's equation. The determination of the pole zero of the system is discussed. A simple method of pole placement is proposed to stabilise the pendulum at the desired position of the cart. Matlab simulation results show the effectiveness of the proposed method. And yet, this intuitive approach can lead to better understanding of the control behaviours.","PeriodicalId":225743,"journal":{"name":"2017 15th International Conference on Quality in Research (QiR) : International Symposium on Electrical and Computer Engineering","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115683546","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-01DOI: 10.1109/QIR.2017.8168499
A. Indarto, I. Garniwa, R. Setiabudy, C. Hudaya
Power transformer (PT) is one of the most important parts in electrical power system. In some cases, many electric utilities do not consider to capitalize the power losses, resulting in uneconomical decision during the purchasing. In this study, to evaluate the best purchase choice of a 60 MVA 150/129 kV PT, we examine the total cost of ownership (TCO) as the basis for determining the total economic value of PT. When purchasing and designing the PT, the optimum parameters are not only solely determined by the design and the lowest cost, but also influenced by material cost, power losses and its typical operation. Hence, design optimization and calculation of TCO of PT is of importance to provide a reliable and economical product. Here it is realized by reviewing the existing design and fabrication as well as the cost structure, design optimization and total cost ownership calculation. The result shows that the PT design optimization employing losses capitalization exhibits the most economical value, reducing TCO up to 3%. We found that the losses capitalization and TCO of PT are sensitively affected by interest rate, economic life of PT, electricity cost, load factor and losses. Those factors are key components to determine the suitable specification, design evaluation and operation of the transformer. This practical study is beneficial both for the owner and manufacturer of PT, thus giving the right specification and design to support purchasing process of PT.
{"title":"Total cost of ownership analysis of 60 MVA 150/120 kV power transformer","authors":"A. Indarto, I. Garniwa, R. Setiabudy, C. Hudaya","doi":"10.1109/QIR.2017.8168499","DOIUrl":"https://doi.org/10.1109/QIR.2017.8168499","url":null,"abstract":"Power transformer (PT) is one of the most important parts in electrical power system. In some cases, many electric utilities do not consider to capitalize the power losses, resulting in uneconomical decision during the purchasing. In this study, to evaluate the best purchase choice of a 60 MVA 150/129 kV PT, we examine the total cost of ownership (TCO) as the basis for determining the total economic value of PT. When purchasing and designing the PT, the optimum parameters are not only solely determined by the design and the lowest cost, but also influenced by material cost, power losses and its typical operation. Hence, design optimization and calculation of TCO of PT is of importance to provide a reliable and economical product. Here it is realized by reviewing the existing design and fabrication as well as the cost structure, design optimization and total cost ownership calculation. The result shows that the PT design optimization employing losses capitalization exhibits the most economical value, reducing TCO up to 3%. We found that the losses capitalization and TCO of PT are sensitively affected by interest rate, economic life of PT, electricity cost, load factor and losses. Those factors are key components to determine the suitable specification, design evaluation and operation of the transformer. This practical study is beneficial both for the owner and manufacturer of PT, thus giving the right specification and design to support purchasing process of PT.","PeriodicalId":225743,"journal":{"name":"2017 15th International Conference on Quality in Research (QiR) : International Symposium on Electrical and Computer Engineering","volume":"395 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116330373","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2017-07-01DOI: 10.1109/QIR.2017.8168525
Antonious Rajagukguk, Ciptian Weried Priananda, D. Riawan, Soedibyo, M. Ashari
Optimization method has been provided for optimizing output power of PV Farm under shaded. So far, many methods approaching the output power of PV Farm by tracking the Maximum Power Point (MPP) of PV farm using P-V curve. The previous methods having complex problem when multiple of MPP is exist in P-V curve when PV farm under partially shaded condition. To overcome these problems so in this paper offers a new method in order to optimize the power output of PV farm for normal and under shaded condition. The new method was named Derivative Cluster Area Methods (DCAM). The method works by doing a comprehensive approach in areas (wide) of the current and voltage characteristic on I vs V curve of PV Farm. In addition to a comprehensive approach in this research area is also combined with a mechanism based on the cluster corresponding voltage levels on each string of PV Farm at normal and under shaded condition. The area where that was obtained by integrating the functions of the current Characteristic curve I vs. V has a large equivalent to the maximum of the power generated by the PV Farm. So that the total area of the mechanism of some cluster is the total power generated by the PV power plant Farm Under normal conditions or under shaded. The conclusion from this study showed that the power generated in a PV farm was increased when compared to the conventional method.
针对遮荫条件下光伏电站输出功率的优化问题，提出了优化方法。目前，很多方法是利用P-V曲线跟踪光伏电站的最大功率点(MPP)来逼近光伏电站的输出功率。在部分遮荫条件下，光伏电站的P-V曲线存在多重MPP时的复杂问题。为了克服这些问题，本文提出了一种新的优化光伏电站正常和阴影条件下输出功率的方法。该方法被命名为导数聚类面积法(DCAM)。该方法通过对光伏电站I vs V曲线上的电流和电压特性(宽)区域进行综合处理而起作用。除此之外，本研究领域的综合方法还结合了基于集群对应的光伏电站在正常和阴影条件下每串电压水平的机制。通过对电流特征曲线I vs. V的函数进行积分得到的面积与光伏电站产生的最大功率相当。使得某集群的机制总面积为正常情况下或遮荫下光伏电站发电场的总发电量。本研究的结论表明，与传统方法相比，光伏农场的发电量增加了。
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Pub Date : 2017-07-01DOI: 10.1109/QIR.2017.8168483
Adyapaka Apatya, Aries Subiantoro, F. Yusivar
The development of electric vehicle is now growing rapidly. Demands to deliver a reliable and easy to drive in motor control causes Brushless Direct Current (BLDC) motor becomes a potential candidate. A BLDC motor drive is a potential option for an electric vehicle since it has a high reliability, simple design, and ability to work at high rotation per minute (RPM). This paper discussed the Permanent Magnet BLDC Motor design method. The structure of an interior rotor permanent magnet type is selected to be used in the design of Permanent Magnet BLDC motor so that it can be applied in a drive that requires a large torque and capable of acceleration and deceleration with good response. Selection of 12 slots and 8 poles configuration aims for improving the motor performance. The motor is designed and simulated using a software-based Motor Solve FEA (Finite Element Analysis). Based on this design and simulation results, a prototype of BLDC motor is built. Parameters testing as stator resistance, inductances (the d-axis and q-axis inductance), and the back emf constant (Ke) were used to evaluate the result of the design and prototype motor. Measuring the prototype motor's parameters was carried out by several different methods depending on the parameters tested. Stator resistance testing is performed with the measurement of current in the coil which is then obtained by calculating the magnitude of stator resistance as 0.14710296 Ω. Measurements of d-axis stator inductance, q-axis stator inductance, and back emf constant of prototype permanent magnet BLDC motor is obtained as results of 0.35304710 mH, 0.38246769 mH and 0.09690626 Vs/rad respectively. The test results between design and prototype testing were quite good. The difference between the test results and the design of the prototype test results was caused by incompatibility of material composition although using the same type of material. The evaluation shows the electromagnetic parameters is influenced by its constituent materials.
电动汽车的发展正在迅速发展。在电机控制中提供可靠且易于驱动的需求使得无刷直流(BLDC)电机成为潜在的候选者。无刷直流电机驱动器是电动汽车的潜在选择，因为它具有高可靠性，设计简单，并且能够以高每分钟转速(RPM)工作。本文讨论了永磁无刷直流电机的设计方法。在永磁无刷直流电机的设计中，选择了内转子永磁式的结构，使得永磁无刷直流电机可以应用于需要大转矩、加减速且响应良好的驱动中。选择12槽8极的配置是为了提高电机的性能。采用基于软件的motor Solve有限元分析软件对电机进行了设计和仿真。基于此设计和仿真结果，搭建了无刷直流电机样机。通过定子电阻、电感(d轴和q轴电感)和反电动势常数(Ke)等参数测试，对设计结果和样机结果进行了评价。根据测试参数的不同，采用了几种不同的方法来测量原型电机的参数。定子电阻测试是通过测量线圈中的电流来进行的，然后通过计算定子电阻的大小为0.14710296 Ω来获得。对原型永磁无刷直流电机的d轴定子电感、q轴定子电感和反电动势常数的测量结果分别为0.35304710 mH、0.38246769 mH和0.09690626 v /rad。从设计测试到原型测试的测试结果都很好。试验结果与原型设计试验结果的差异是由于材料成分不相容造成的，尽管使用的是同一种材料。评价结果表明，电磁参数受其组成材料的影响。
{"title":"Design and prototyping of 3-phase BLDC motor","authors":"Adyapaka Apatya, Aries Subiantoro, F. Yusivar","doi":"10.1109/QIR.2017.8168483","DOIUrl":"https://doi.org/10.1109/QIR.2017.8168483","url":null,"abstract":"The development of electric vehicle is now growing rapidly. Demands to deliver a reliable and easy to drive in motor control causes Brushless Direct Current (BLDC) motor becomes a potential candidate. A BLDC motor drive is a potential option for an electric vehicle since it has a high reliability, simple design, and ability to work at high rotation per minute (RPM). This paper discussed the Permanent Magnet BLDC Motor design method. The structure of an interior rotor permanent magnet type is selected to be used in the design of Permanent Magnet BLDC motor so that it can be applied in a drive that requires a large torque and capable of acceleration and deceleration with good response. Selection of 12 slots and 8 poles configuration aims for improving the motor performance. The motor is designed and simulated using a software-based Motor Solve FEA (Finite Element Analysis). Based on this design and simulation results, a prototype of BLDC motor is built. Parameters testing as stator resistance, inductances (the d-axis and q-axis inductance), and the back emf constant (Ke) were used to evaluate the result of the design and prototype motor. Measuring the prototype motor's parameters was carried out by several different methods depending on the parameters tested. Stator resistance testing is performed with the measurement of current in the coil which is then obtained by calculating the magnitude of stator resistance as 0.14710296 Ω. Measurements of d-axis stator inductance, q-axis stator inductance, and back emf constant of prototype permanent magnet BLDC motor is obtained as results of 0.35304710 mH, 0.38246769 mH and 0.09690626 Vs/rad respectively. The test results between design and prototype testing were quite good. The difference between the test results and the design of the prototype test results was caused by incompatibility of material composition although using the same type of material. The evaluation shows the electromagnetic parameters is influenced by its constituent materials.","PeriodicalId":225743,"journal":{"name":"2017 15th International Conference on Quality in Research (QiR) : International Symposium on Electrical and Computer Engineering","volume":"63 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2017-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124284882","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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