Pub Date : 2014-05-25DOI: 10.1109/ICHQP.2014.6842772
A. Shahid, H. Azhar
The core issues with Distributed Generation (DG) systems of today are the insertion of power quality threats, harmonic distortions to the main stream power system and inefficient power sharing leading to power fluctuation problem. This paper effectively sorts out the causes of power fluctuation in islanded mode of operation of micro-grids and presents an effective method for their optimum compensation. MATLAB/SIMULINK has been employed to simulate a distributed generation system, essentially a fuel cell based micro-grid. Sinusoidal Pulse Width Modulation (SPWM) technique for DC/AC conversion is well used. Droop control model, has been optimized to ensure optimum power sharing, in which output frequency and voltage of micro-source are controlled by droop and boost equations. This type of modular approach is of immense importance in reducing the system level harmonic content to a significant extent thereby maintaining standard power delivery to the distributed loads in accordance with IEEE standards.
{"title":"A modular control design for optimum harmonic compensation in micro-grids considering active and reactive power sharing","authors":"A. Shahid, H. Azhar","doi":"10.1109/ICHQP.2014.6842772","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842772","url":null,"abstract":"The core issues with Distributed Generation (DG) systems of today are the insertion of power quality threats, harmonic distortions to the main stream power system and inefficient power sharing leading to power fluctuation problem. This paper effectively sorts out the causes of power fluctuation in islanded mode of operation of micro-grids and presents an effective method for their optimum compensation. MATLAB/SIMULINK has been employed to simulate a distributed generation system, essentially a fuel cell based micro-grid. Sinusoidal Pulse Width Modulation (SPWM) technique for DC/AC conversion is well used. Droop control model, has been optimized to ensure optimum power sharing, in which output frequency and voltage of micro-source are controlled by droop and boost equations. This type of modular approach is of immense importance in reducing the system level harmonic content to a significant extent thereby maintaining standard power delivery to the distributed loads in accordance with IEEE standards.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"110 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131891319","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842848
V. Vlad, C. Popa, A. Graur, R. Pentiuc
This paper presents our vision on developing a software tool for modeling and simulating the intelligent behavior of the future power grid. Modeling approaches based on function blocks and holonic concepts are proposed for the intelligent control entities, designed to interact with each other to optimize the operation of the grid in relation to the distribution of power, integration of equipment and failure recovery. IEC 61850 specifications are selected as reference model for communications.
{"title":"Concepts and models for design and simulation of distributed control systems for future power grid","authors":"V. Vlad, C. Popa, A. Graur, R. Pentiuc","doi":"10.1109/ICHQP.2014.6842848","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842848","url":null,"abstract":"This paper presents our vision on developing a software tool for modeling and simulating the intelligent behavior of the future power grid. Modeling approaches based on function blocks and holonic concepts are proposed for the intelligent control entities, designed to interact with each other to optimize the operation of the grid in relation to the distribution of power, integration of equipment and failure recovery. IEC 61850 specifications are selected as reference model for communications.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131994408","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842749
A. Ramirez
This paper presents a methodology to simulate electric networks in the dynamic harmonic domain (DHD) via model order reduction. Initially, the full-order system of ordinary differential equations (ODEs), expressed in the DHD, is internally balanced in the state sense. Then, the balanced system is truncated by selecting the dominant subsystem, resulting in a reduced-order system of ODEs. The reduced system permits to reproduce the dynamics of the original full-size system with accuracy dictated by the Hankel singular values, also known as second-order modes, of the balanced system. Also, the reduced-order system permits to achieve computational savings. A sample network is used for the illustration of the proposed method.
{"title":"Reduced-order state-space systems in the dynamic harmonic domain","authors":"A. Ramirez","doi":"10.1109/ICHQP.2014.6842749","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842749","url":null,"abstract":"This paper presents a methodology to simulate electric networks in the dynamic harmonic domain (DHD) via model order reduction. Initially, the full-order system of ordinary differential equations (ODEs), expressed in the DHD, is internally balanced in the state sense. Then, the balanced system is truncated by selecting the dominant subsystem, resulting in a reduced-order system of ODEs. The reduced system permits to reproduce the dynamics of the original full-size system with accuracy dictated by the Hankel singular values, also known as second-order modes, of the balanced system. Also, the reduced-order system permits to achieve computational savings. A sample network is used for the illustration of the proposed method.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133058882","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842898
Tomas Hruby, S. Kocman
Various technical solutions are used to reduce harmonics generated by variable speed drives (VSD). AC VSD belong to their very significant sources with negative influences on the quality of electrical energy at the point of their connection to the network. The paper presents measured results of two types of broadband passive harmonic filters energized from a it programmable three-phase power source Pacific 3120ASX and provides their comparison to the results from a simulation model using EMTP-ATP program. A possibility of applying broadband passive harmonic filter into a structure of a drive of conveyor belt in the coal treatment plant is also shown and compared to the present condition. The results present that the effectiveness of the filters to eliminate harmonics is very good. Nevertheless, it is considerably affected by the quality of supply voltage at the point of filter coupling.
{"title":"Using broadband passive harmonic filters for harmonic mitigation in AC drives","authors":"Tomas Hruby, S. Kocman","doi":"10.1109/ICHQP.2014.6842898","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842898","url":null,"abstract":"Various technical solutions are used to reduce harmonics generated by variable speed drives (VSD). AC VSD belong to their very significant sources with negative influences on the quality of electrical energy at the point of their connection to the network. The paper presents measured results of two types of broadband passive harmonic filters energized from a it programmable three-phase power source Pacific 3120ASX and provides their comparison to the results from a simulation model using EMTP-ATP program. A possibility of applying broadband passive harmonic filter into a structure of a drive of conveyor belt in the coal treatment plant is also shown and compared to the present condition. The results present that the effectiveness of the filters to eliminate harmonics is very good. Nevertheless, it is considerably affected by the quality of supply voltage at the point of filter coupling.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133120371","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842843
M. Balci, M. H. Hocaoğlu, Ahmet Koksoy, Onur Ozturk, Bahtiyar Dursun
This paper proposes a model of the induction generator for the phase-domain power flow analysis of fixed speed wind turbine generating systems connected to balanced or unbalanced three-phase distribution systems. The proposed model is established by using a modified bi-quadratic equation, which is generally used for the calculation of node voltages in the power flow analysis of distribution systems. The main advantage of the proposed model is that it does not require slip information. Thus, it has computational efficiency when compared with the slip calculation based phase-domain induction generator model. In addition, for several unbalanced voltage cases, the numerical results of the proposed model, slip calculation based phase-domain model and time-domain d-q model are comparatively evaluated to show the validity of the proposed one.
{"title":"A fixed speed induction generator model for unbalanced power flow analysis","authors":"M. Balci, M. H. Hocaoğlu, Ahmet Koksoy, Onur Ozturk, Bahtiyar Dursun","doi":"10.1109/ICHQP.2014.6842843","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842843","url":null,"abstract":"This paper proposes a model of the induction generator for the phase-domain power flow analysis of fixed speed wind turbine generating systems connected to balanced or unbalanced three-phase distribution systems. The proposed model is established by using a modified bi-quadratic equation, which is generally used for the calculation of node voltages in the power flow analysis of distribution systems. The main advantage of the proposed model is that it does not require slip information. Thus, it has computational efficiency when compared with the slip calculation based phase-domain induction generator model. In addition, for several unbalanced voltage cases, the numerical results of the proposed model, slip calculation based phase-domain model and time-domain d-q model are comparatively evaluated to show the validity of the proposed one.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"234 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115753254","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842812
W. J. Olechiw, D. Sabin, C. Dimitriu, F. Doherty, Gary Mcleod
The traditional role of a Power Quality Monitoring System (PQMS) has been to capture power quality information from power quality instruments and present the information in a format that allows the waveforms and trended data to be presented for analysis of events, the evaluation of the overall quality of power, by considering harmonics and flicker, and produce reports for reporting compliance to regulatory standards. This role remains the core capability of any PQMS system. However, with enhanced communications, the ability to obtain data from a wide variety of instruments and smart devices and expanded analysis and correlation capabilities, PQMS have become the basis for improving system wide operation, including the rapid implementation of corrective action when events occur, such as faults, improved asset management of key system equipment, and indication of pending component failures, allowing for scheduled maintenance rather than unscheduled repairs. In addition, the information available has value to many of the departments with a utility organization, and by making the information available to the different departments, increases the value of the information, and provides for even more value as power system engineers apply their experience and knowledge.
{"title":"Power quality monitoring systems more information than just waveforms and events","authors":"W. J. Olechiw, D. Sabin, C. Dimitriu, F. Doherty, Gary Mcleod","doi":"10.1109/ICHQP.2014.6842812","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842812","url":null,"abstract":"The traditional role of a Power Quality Monitoring System (PQMS) has been to capture power quality information from power quality instruments and present the information in a format that allows the waveforms and trended data to be presented for analysis of events, the evaluation of the overall quality of power, by considering harmonics and flicker, and produce reports for reporting compliance to regulatory standards. This role remains the core capability of any PQMS system. However, with enhanced communications, the ability to obtain data from a wide variety of instruments and smart devices and expanded analysis and correlation capabilities, PQMS have become the basis for improving system wide operation, including the rapid implementation of corrective action when events occur, such as faults, improved asset management of key system equipment, and indication of pending component failures, allowing for scheduled maintenance rather than unscheduled repairs. In addition, the information available has value to many of the departments with a utility organization, and by making the information available to the different departments, increases the value of the information, and provides for even more value as power system engineers apply their experience and knowledge.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125601332","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842803
S. B. Singh, Ashutosh Kumar Singh, Padmanabh Thakur
This paper highlights the shortfalls of the NEMA and IEC defined indices for the quantification degree of voltage unbalance. It is shown that these indices are not accurate for the assessment of voltage unbalance conditions. The large variations in terminal voltage for fixed values of these indices result in vague assessment of the voltage unbalance by these standards. To reduce this anomaly, numerous indices have been developed by the researchers. Generally, great attentions have been paid on IEC based indices. However, this paper considers the indices defined by NEMA standard, as it is highly recommended by industrial engineers, due to its simplicity. Two new indices are introduced and it is shown that, the degree of unbalance as defined by NEMA along with proposed indices reduce the terminal voltage variations. Hence, the proposed indices in association with NEMA index, give the accurate estimation of voltage unbalance assessment.
{"title":"Accurate steady-state performance assessment of three-phase induction motor using NEMA definition","authors":"S. B. Singh, Ashutosh Kumar Singh, Padmanabh Thakur","doi":"10.1109/ICHQP.2014.6842803","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842803","url":null,"abstract":"This paper highlights the shortfalls of the NEMA and IEC defined indices for the quantification degree of voltage unbalance. It is shown that these indices are not accurate for the assessment of voltage unbalance conditions. The large variations in terminal voltage for fixed values of these indices result in vague assessment of the voltage unbalance by these standards. To reduce this anomaly, numerous indices have been developed by the researchers. Generally, great attentions have been paid on IEC based indices. However, this paper considers the indices defined by NEMA standard, as it is highly recommended by industrial engineers, due to its simplicity. Two new indices are introduced and it is shown that, the degree of unbalance as defined by NEMA along with proposed indices reduce the terminal voltage variations. Hence, the proposed indices in association with NEMA index, give the accurate estimation of voltage unbalance assessment.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"29 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134285447","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842809
J. Blanco, J. Petit, G. Ordonez
This paper presents a new method for relative location of voltage sags and capacitor switching transients based on voltage measurements only. Voltage sags caused by network faults and transients caused by bank capacitor energizing are considered in this work. The algorithm automatically operates for assessing power quality, characterising and extracting information from voltage records obtained from power quality monitors (PQMs) in distribution systems. Positive sequence voltages are the descriptors used to determine the relative location of the voltage events. Instantaneous voltage changes are the descriptors used to determine the relative location of capacitor switching transients. Finally, proposed method is applied to a study case and it is verified that the method can be helpful to determine the relative location of the voltage events. MATLAB was used for validating this methodology, receiving voltage records from simulated voltage sags in ATP-EMTP and its easy implementation is verified.
{"title":"Algorithm for relative location of voltage sags and capacitor switching transients based on voltage measurements only","authors":"J. Blanco, J. Petit, G. Ordonez","doi":"10.1109/ICHQP.2014.6842809","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842809","url":null,"abstract":"This paper presents a new method for relative location of voltage sags and capacitor switching transients based on voltage measurements only. Voltage sags caused by network faults and transients caused by bank capacitor energizing are considered in this work. The algorithm automatically operates for assessing power quality, characterising and extracting information from voltage records obtained from power quality monitors (PQMs) in distribution systems. Positive sequence voltages are the descriptors used to determine the relative location of the voltage events. Instantaneous voltage changes are the descriptors used to determine the relative location of capacitor switching transients. Finally, proposed method is applied to a study case and it is verified that the method can be helpful to determine the relative location of the voltage events. MATLAB was used for validating this methodology, receiving voltage records from simulated voltage sags in ATP-EMTP and its easy implementation is verified.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"10 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132189806","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842862
A. Racasan, C. Munteanu, V. Topa, C. Pacurar, C. Hebedean, E. Adam
This paper outlines a method for the suppression of the parasitic inside electromagnetic interferences (EMI) filters that are used in power supply devices. The paper focuses on EMI filters designed using the electromagnetic integrated planar technology. To accomplish this task the authors set up an optimal design algorithm named OptimCond that is able to find out the optimal arrangement of the windings in order to minimize the structural parasitic capacitance of the filter. The algorithm proposed is applied to increase the EMI filtering performances for a well-known filter realized in planar technology.
{"title":"Numerical analysis and modeling of the electromagnetic interferences in integrated planar structures","authors":"A. Racasan, C. Munteanu, V. Topa, C. Pacurar, C. Hebedean, E. Adam","doi":"10.1109/ICHQP.2014.6842862","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842862","url":null,"abstract":"This paper outlines a method for the suppression of the parasitic inside electromagnetic interferences (EMI) filters that are used in power supply devices. The paper focuses on EMI filters designed using the electromagnetic integrated planar technology. To accomplish this task the authors set up an optimal design algorithm named OptimCond that is able to find out the optimal arrangement of the windings in order to minimize the structural parasitic capacitance of the filter. The algorithm proposed is applied to increase the EMI filtering performances for a well-known filter realized in planar technology.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"451 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133812246","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 : 2014-05-25DOI: 10.1109/ICHQP.2014.6842868
C. Farkas, A. Dán
Nowadays, the ITIC curve is commonly used for evaluating voltage dips' severity. However, this curve may not catch equipment sensitivity well enough and it certainly lacks the information about the probability of whether any equipment is indeed switched on or not. In this paper we present a novel voltage dip severity evaluation method based on the lost voltage-time area of the dip and also give detailed insight into the generalization of this method based on fuzzy logic. To compare the different methods used in the industry, the ones found in the literature and ours with each other, a voltage dip evaluator program was written in MATLAB and the methods were tested against each other by using voltage dip measurement data received from the local DSO. The probability of whether any equipment is switched on or not is also investigated by using a so-called on-period curve that was determined by taking average household consumption data into consideration.
{"title":"Evaluation of voltage dip severity based on lost voltage-time area","authors":"C. Farkas, A. Dán","doi":"10.1109/ICHQP.2014.6842868","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842868","url":null,"abstract":"Nowadays, the ITIC curve is commonly used for evaluating voltage dips' severity. However, this curve may not catch equipment sensitivity well enough and it certainly lacks the information about the probability of whether any equipment is indeed switched on or not. In this paper we present a novel voltage dip severity evaluation method based on the lost voltage-time area of the dip and also give detailed insight into the generalization of this method based on fuzzy logic. To compare the different methods used in the industry, the ones found in the literature and ours with each other, a voltage dip evaluator program was written in MATLAB and the methods were tested against each other by using voltage dip measurement data received from the local DSO. The probability of whether any equipment is switched on or not is also investigated by using a so-called on-period curve that was determined by taking average household consumption data into consideration.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"73 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133210818","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}
京公网安备 11010802042870号
京ICP备2023020795号-1
扫码关注我们
求助内容：
应助结果提醒方式：