{"title":"Area of vulnerability for prediction of voltage sags by an analytical method in indian distribution systems","authors":"A. Goswami, C. P. Gupta, G. Singh","doi":"10.1109/INDCON.2008.4768758","DOIUrl":"https://doi.org/10.1109/INDCON.2008.4768758","url":null,"abstract":"This paper proposes an analytical method for voltage sags prediction in distribution systems. The method is based on the ZBus matrix of the distribution network, from which one can immediately build a second matrix that can be called the ldquovoltage sags matrixrdquo as it compactly provides valuable information about voltage sags throughout the distribution systems. The paper also describes graphical ways to present the effect of a fault on the distribution systems and the area where faults cause severe sags on a given load: affected area and area of vulnerability respectively. An Indian distribution system is used to illustrate the ideas.","PeriodicalId":196254,"journal":{"name":"2008 Annual IEEE India Conference","volume":"11 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124060212","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}
{"title":"Enhancing enterprise network management using SMART","authors":"P. Saravanan, E. Reuter, S. Verma","doi":"10.1109/INDCON.2008.4768747","DOIUrl":"https://doi.org/10.1109/INDCON.2008.4768747","url":null,"abstract":"Network management is one of the important areas in todaypsilas computing world. A basic requirement for the management of a complex network is the definition of high-level and flexible models to coordinate the accesses to the resources data and services provided by the network nodes. Most of the network management platforms are based on polling-based centralized SNMP management model which has the limitations like need for maintaining a central intelligence, bandwidth consumption etc... So, in the area of network management, mobile agent technology can lead to a fully distributed paradigm to overcome the limitations of traditional centralized approaches by, minimizing bandwidth consumption, supporting network load balancing, enhancing scalability as well as flexibility, increase fault tolerance and solve problems caused by unreliable network connections. Despite of its many practical benefits, mobile agent technology results in significant new security threats from both malicious agents and hosts. And also, most of the today mobile agent systems are very resource demanding both for the client and the server. In this paper we propose a hierarchical network management framework based on mobile agent technology for enterprise networks that makes it possible to manage heterogeneous devices in flexible and reliable manner. We present a management architecture that supports distributed network management, flexible coordination and runtime topology discovery in order to manage dynamic evolving network components. We also propose a security mechanism at various levels in the hierarchy to protect agents and their state.","PeriodicalId":196254,"journal":{"name":"2008 Annual IEEE India Conference","volume":"323 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122626338","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}
{"title":"An experimental comparison of adaptive controllers on a pH neutralization pilot plant","authors":"E. Peymani, A. Fatehi, P. Bashivan, A. Sedigh","doi":"10.1109/INDCON.2008.4768753","DOIUrl":"https://doi.org/10.1109/INDCON.2008.4768753","url":null,"abstract":"Inherent nonlinearity of pH processes causes that they are recognized as an appropriate test bench for evaluation of advanced controllers. Because of special characteristics of them, it is evident that adaptive controllers outperform others. This paper presents a comparison between a conventional adaptive controller and a switching multiple-model adaptive one in both regulation and disturbance rejection points of view. A disturbance rejection supervisor is designed to improve the performance of the adaptive controllers in the presence of unmeasured disturbances. A laboratory scale pH process is used as an application example.","PeriodicalId":196254,"journal":{"name":"2008 Annual IEEE India Conference","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117050653","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}
{"title":"A simple approach to space vector pwm signal generation for a five-phase voltage source inverter","authors":"A. Iqbal, M. Khan","doi":"10.1109/INDCON.2008.4768760","DOIUrl":"https://doi.org/10.1109/INDCON.2008.4768760","url":null,"abstract":"An alternative and simple space vector pulse width modulation (SVPWM) scheme for a five-phase voltage source inverter (VSI) is proposed in this paper. The proposed PWM scheme generates the inverter leg switching times, from the sampled reference phase voltage amplitudes and centre the switching times for the middle vectors, in a sampling interval, as in the case of conventional space vector PWM. Similar technique has been reported in the literature for a three-phase VSI which is further extended in this paper to a five-phase VSI. The proposed PWM scheme utilizes only the sampled amplitude of reference phase voltages for implementing the SVPWM. It does not involve any sector identification and a number of look tables thus considerably reducing the computation time when compared to the conventional space vector PWM scheme. The proposed technique thus is simple and less demanding for use in real time DSP implementation.","PeriodicalId":196254,"journal":{"name":"2008 Annual IEEE India Conference","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131711267","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}
{"title":"An improved ANN based admittance relay using pre-processed inputs","authors":"G. Chawla, M. Sachdev, G. Ramakrishna","doi":"10.1109/INDCON.2008.4768832","DOIUrl":"https://doi.org/10.1109/INDCON.2008.4768832","url":null,"abstract":"This paper addresses some of the issues associated with the conventional relay designs and presents an improved distance relaying pre-processing algorithm. Instantaneous current and voltage values obtained directly from the power system have been used to obtain the processed inputs. The presented algorithm has been combined with a neural network approach to eliminate the process of phasor estimation, which is usually used in most numerical relaying algorithms. The neural network has been trained to recognize the phase difference between the processed inputs, and therefore eliminates the need of calculating phasors. The processed inputs given to the neural network have a direct relationship with the outputs expected from a relay, which helps to use a data window lesser than one full cycle to accurately detect faults, making the algorithm faster than traditional designs. The neural network based relay has been trained using pure sinusoidal values and tested on a 17-bus power system simulated in PSCADtrade. The results show that the relay is able to detect faults in lesser time as compared to conventional relay algorithms while maintaining the integrity of relay boundaries.","PeriodicalId":196254,"journal":{"name":"2008 Annual IEEE India Conference","volume":"07 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132570109","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}
{"title":"Fuzzy logic based supervision of DC link PI control in a DSTATCOM","authors":"H. Suryanarayana, M. Mishra","doi":"10.1109/INDCON.2008.4768766","DOIUrl":"https://doi.org/10.1109/INDCON.2008.4768766","url":null,"abstract":"In a DSTATCOM, generally, the DC capacitor voltage is regulated using a PI controller when various control algorithms are used for load compensation. However, during load changes, there is considerable variation in DC capacitor voltage which might affect compensation. In this work, a fuzzy logic based supervisory method is proposed to improve transient performance of the DC link. The fuzzy logic based supervisor varies the proportional and integral gains of the PI controller during the transient period immediately after a load change. An improvement in the performance of the controller is obtained because of appropriate variation of PI gains using expert knowledge of system behaviour and higher sampling during the transient period. A 50% reduction in the error in DC link capacitor voltage during load change compared to a normal PI controller is obtained. The voltage waveform also has a faster settling time. The efficacy of the proposed strategy is proved using detailed simulation studies.","PeriodicalId":196254,"journal":{"name":"2008 Annual IEEE India Conference","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124429694","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}
{"title":"Nonholonomic mobile robots cooperative control for target capturing","authors":"M.A. El Kamel, L. Beji, A. Abichou","doi":"10.1109/INDCON.2008.4768783","DOIUrl":"https://doi.org/10.1109/INDCON.2008.4768783","url":null,"abstract":"For N unicycles moving in formation, a cooperative control strategy for target capturing including the steering angle regulation problem is proposed in this paper. The stabilizing method is based on LaSallepsilas invariance principle and ensures, in the 2D space, the target capturing. The method does not require motion planning. Hence, the convergence to the desired attractive set surrounding the target is asserted only by the control. Being given a desired attack angle for each entity (agent) when surrounding the target, the proposed cooperative control law permits to achieve this goal. The stability of the formation is realized when all unicycles converge to a certain attractive set.","PeriodicalId":196254,"journal":{"name":"2008 Annual IEEE India Conference","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126632459","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}
{"title":"Lateral stability of a typical nose landing gear using torsional magneto-rheological (MR) damper","authors":"S. Bandaru, D. Maiti","doi":"10.1109/INDCON.2008.4768784","DOIUrl":"https://doi.org/10.1109/INDCON.2008.4768784","url":null,"abstract":"Aircraft landing gears are subjected to a wide range of excitation conditions, which result in conflicting damping requirements. A novel solution to this problem is to implement semi-active damping using magnetorheological (MR) fluids. In the present study, the shimmy model is developed based on the formulation of G. X. Li, to study the self-induced dynamic instability at the critical forward taxiing velocity. The effect of various parameters on the shimmy behaviour is also studied. The study has been performed to postpone the dynamic instability by introducing MR fluid based damper as a semi-active device.","PeriodicalId":196254,"journal":{"name":"2008 Annual IEEE India Conference","volume":"42 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2008-12-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126130865","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}