Pub Date : 2018-05-13DOI: 10.1109/ICHQP.2018.8378815
Daniel Agudelo-Martinez, Fabián Ríos, A. Pavas
Disturbances interaction at supraharmonic range between some low-power LED lamps in single and simultaneous operation are described through this article using measurements and simulations. Cases are carried out measuring and simulating typical LED circuits without any Power Factor Corrector stage. The corresponding DC-DC converters and other circuits are simulated in LTSpice® and PSpice® using typical values found in market-available lamps. From measurements and simulations it can be seen that even same technology devices (i.e. low-power LED lamps) can behave as disturbance emitters or receivers. This qualitative study is a step forward to understand the disturbances in the range 2–150 kHz at low voltage based on power electronics circuits.
{"title":"Interaction of some low power LED lamps within 2–150 kHz (supraharmonics)","authors":"Daniel Agudelo-Martinez, Fabián Ríos, A. Pavas","doi":"10.1109/ICHQP.2018.8378815","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378815","url":null,"abstract":"Disturbances interaction at supraharmonic range between some low-power LED lamps in single and simultaneous operation are described through this article using measurements and simulations. Cases are carried out measuring and simulating typical LED circuits without any Power Factor Corrector stage. The corresponding DC-DC converters and other circuits are simulated in LTSpice® and PSpice® using typical values found in market-available lamps. From measurements and simulations it can be seen that even same technology devices (i.e. low-power LED lamps) can behave as disturbance emitters or receivers. This qualitative study is a step forward to understand the disturbances in the range 2–150 kHz at low voltage based on power electronics circuits.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"68 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86062772","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 : 2018-05-13DOI: 10.1109/ICHQP.2018.8378928
P. E. T. Martins, M. Oleskovicz, A. Pessoa, Iago de Moura Faria
Short-duration voltage variations are disturbances of great concern, in the context of power quality. The permanent monitoring of these events is important because they are unpredictable and cause high economic losses to consumers. The strategic placement of power quality monitors has been studied, aiming, mostly, to reduce the installation cost of this monitoring system. However, it is more important not just monitoring these disturbances, but also identify their sources. This paper proposes a multi-objective approach, aiming, besides to reduce the cost also provide a meter allocation in favor of the location of the disturbance source. The optimization model proposed is solved by means of the Algorithm for Bicriteria Discrete Optimization and applied in IEEE 13 bus distribution test system. Several options of monitoring systems were obtained, respecting various constraints that influence decision making.
{"title":"Optimized allocation of power quality monitors in distribution systems considering fault location","authors":"P. E. T. Martins, M. Oleskovicz, A. Pessoa, Iago de Moura Faria","doi":"10.1109/ICHQP.2018.8378928","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378928","url":null,"abstract":"Short-duration voltage variations are disturbances of great concern, in the context of power quality. The permanent monitoring of these events is important because they are unpredictable and cause high economic losses to consumers. The strategic placement of power quality monitors has been studied, aiming, mostly, to reduce the installation cost of this monitoring system. However, it is more important not just monitoring these disturbances, but also identify their sources. This paper proposes a multi-objective approach, aiming, besides to reduce the cost also provide a meter allocation in favor of the location of the disturbance source. The optimization model proposed is solved by means of the Algorithm for Bicriteria Discrete Optimization and applied in IEEE 13 bus distribution test system. Several options of monitoring systems were obtained, respecting various constraints that influence decision making.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"3 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82795502","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 : 2018-05-13DOI: 10.1109/ICHQP.2018.8378902
R. Igual, C. Medrano, F. Arcega, G. Măntescu
Power quality (PQ) disturbances lead to severe problems in industries and electrical grids. To mitigate PQ problems, the accurate detection and classification of the possible disturbances are essential. A large number of studies exists in this field. The first research step in these studies is to obtain several distorted signals to test the classification systems. In this regard, the most common trend is the generation of signals from mathematical models. In the literature, we can find several models with significant differences among them. However, to the best of our knowledge, there is no integral model that considers all types of distortions. This work presents an integral mathematical model based on the models found in the literature. The model also includes new types of combined disturbances. Twenty-nine disturbances are considered. Additionally, this work includes a software version of this integral model that is publicly available to be used by any interested researcher. In this way, PQ disturbances can be generated in a fast and automatic way. This software aims to facilitate future studies, supporting researchers in the modelling stage.
{"title":"Integral mathematical model of power quality disturbances","authors":"R. Igual, C. Medrano, F. Arcega, G. Măntescu","doi":"10.1109/ICHQP.2018.8378902","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378902","url":null,"abstract":"Power quality (PQ) disturbances lead to severe problems in industries and electrical grids. To mitigate PQ problems, the accurate detection and classification of the possible disturbances are essential. A large number of studies exists in this field. The first research step in these studies is to obtain several distorted signals to test the classification systems. In this regard, the most common trend is the generation of signals from mathematical models. In the literature, we can find several models with significant differences among them. However, to the best of our knowledge, there is no integral model that considers all types of distortions. This work presents an integral mathematical model based on the models found in the literature. The model also includes new types of combined disturbances. Twenty-nine disturbances are considered. Additionally, this work includes a software version of this integral model that is publicly available to be used by any interested researcher. In this way, PQ disturbances can be generated in a fast and automatic way. This software aims to facilitate future studies, supporting researchers in the modelling stage.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"32 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90390383","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 : 2018-05-13DOI: 10.1109/ICHQP.2018.8378827
Z. Staroszczyk
In normal operational states and for standard customers the LTI (linear time invariant) impedance based power grid model sufficiently well approximates its real behavior. With the introduction of DG and smart grids, accompanied with the growing power of measuring/data processing instrumentation, the drawback of LTI descriptor is observable and more accurate models are required. Such extension is with the LPTV (linear periodical time variant) grid modeling. The interest in LPTV power grid properties investigations is growing due to less centralized DG and massive implementation of intelligent switched loads (LED illumination, electrical cars chargers etc). With the new solution of the grid impedance analyzer the LPTV properties of the real University grid were investigated. With the use of simulations the experimental data were extended, giving deeper insight into quick time varying grid behavior. In conclusions some propositions for the future research in the field are proposed.
{"title":"Smart grids LPTV behavior - real problem in real grids?","authors":"Z. Staroszczyk","doi":"10.1109/ICHQP.2018.8378827","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378827","url":null,"abstract":"In normal operational states and for standard customers the LTI (linear time invariant) impedance based power grid model sufficiently well approximates its real behavior. With the introduction of DG and smart grids, accompanied with the growing power of measuring/data processing instrumentation, the drawback of LTI descriptor is observable and more accurate models are required. Such extension is with the LPTV (linear periodical time variant) grid modeling. The interest in LPTV power grid properties investigations is growing due to less centralized DG and massive implementation of intelligent switched loads (LED illumination, electrical cars chargers etc). With the new solution of the grid impedance analyzer the LPTV properties of the real University grid were investigated. With the use of simulations the experimental data were extended, giving deeper insight into quick time varying grid behavior. In conclusions some propositions for the future research in the field are proposed.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"35 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73242037","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 : 2018-05-13DOI: 10.1109/ICHQP.2018.8378921
Jakob Nömm, S. Rönnberg, M. Bollen
The harmonic voltage distortion have been measured in a single house microgrid in Sweden. The microgrid can operate in both islanded mode and grid connected mode. A comparison of the voltage harmonic magnitudes has been made between the two operation states and also against relevant standards. Both the 10 minute average and the 3 second average values are presented in the paper. The harmonic voltage magnitudes are higher during island mode and the difference between the 10 minute value and 3 second value is also greater compared to when the microgrid is connected to the grid. At some instances the magnitudes of both total harmonic distortion and of individual harmonics exceed the limits described in the standards.
{"title":"Harmonic voltage measurements in a single house microgrid","authors":"Jakob Nömm, S. Rönnberg, M. Bollen","doi":"10.1109/ICHQP.2018.8378921","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378921","url":null,"abstract":"The harmonic voltage distortion have been measured in a single house microgrid in Sweden. The microgrid can operate in both islanded mode and grid connected mode. A comparison of the voltage harmonic magnitudes has been made between the two operation states and also against relevant standards. Both the 10 minute average and the 3 second average values are presented in the paper. The harmonic voltage magnitudes are higher during island mode and the difference between the 10 minute value and 3 second value is also greater compared to when the microgrid is connected to the grid. At some instances the magnitudes of both total harmonic distortion and of individual harmonics exceed the limits described in the standards.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"20 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80905540","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 : 2018-05-13DOI: 10.1109/ICHQP.2018.8378843
V. Ioniță, E. Cazacu, L. Petrescu
The effect of distorted voltage waveforms on the iron losses, considering the magnetic hysteresis, is quantitatively studied, using an accurate losses separation method and a time-integration for each component. The model parameters, including the Preisach hysteresis function, are identified by magnetic measurements. A case-study, implying measured electric power quality data in a metal processing and thermal treatment facility, is presented to outline the consequences of a non-sinusoidal regime on iron losses in high power low-voltage motors with rated power between 132 kW and 200 kW. Three sorts of standard FeSi non-oriented electrical sheets (M330-50A, M400-65A and M700-65A) were considered for the motor magnetic core. The iron losses, estimated both for non-saturated and saturated core regions, rise with 11-35 % for the measured non-sinusoidal voltage having 7.6% total harmonic distortion.
{"title":"Effect of voltage harmonics on iron losses in magnetic cores with hysteresis","authors":"V. Ioniță, E. Cazacu, L. Petrescu","doi":"10.1109/ICHQP.2018.8378843","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378843","url":null,"abstract":"The effect of distorted voltage waveforms on the iron losses, considering the magnetic hysteresis, is quantitatively studied, using an accurate losses separation method and a time-integration for each component. The model parameters, including the Preisach hysteresis function, are identified by magnetic measurements. A case-study, implying measured electric power quality data in a metal processing and thermal treatment facility, is presented to outline the consequences of a non-sinusoidal regime on iron losses in high power low-voltage motors with rated power between 132 kW and 200 kW. Three sorts of standard FeSi non-oriented electrical sheets (M330-50A, M400-65A and M700-65A) were considered for the motor magnetic core. The iron losses, estimated both for non-saturated and saturated core regions, rise with 11-35 % for the measured non-sinusoidal voltage having 7.6% total harmonic distortion.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"15 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73701707","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 : 2018-05-13DOI: 10.1109/ICHQP.2018.8378829
Venkata Krishna Gonuguntala, Anke Fröbel, R. Vick
This paper presents a finite control set model predictive control (FCS-MPC) based shunt active harmonic filter (SAHF) for power quality improvement. A detailed mathematical model of a SAHF is considered and used with the FCS-MPC algorithm for future prediction. The reference currents required for harmonic mitigation and reactive power compensation are generated using p-q theory. The two step ahead reference values required for compensating calculation delay in the FCS-MPC algorithm are obtained by using vector angle method. The simulation results present the compensation capabilities of the proposed SAHF and its control. The performance of the proposed system is evaluated for steady state and transient conditions. The influence of model parameter errors on the performance of the controller is analyzed by considering the total harmonic distortion (THD) of the source current and the absolute reference tracking error of the filter current as a measure to evaluate its robustness.
{"title":"Performance analysis of finite control set model predictive controlled active harmonic filter","authors":"Venkata Krishna Gonuguntala, Anke Fröbel, R. Vick","doi":"10.1109/ICHQP.2018.8378829","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378829","url":null,"abstract":"This paper presents a finite control set model predictive control (FCS-MPC) based shunt active harmonic filter (SAHF) for power quality improvement. A detailed mathematical model of a SAHF is considered and used with the FCS-MPC algorithm for future prediction. The reference currents required for harmonic mitigation and reactive power compensation are generated using p-q theory. The two step ahead reference values required for compensating calculation delay in the FCS-MPC algorithm are obtained by using vector angle method. The simulation results present the compensation capabilities of the proposed SAHF and its control. The performance of the proposed system is evaluated for steady state and transient conditions. The influence of model parameter errors on the performance of the controller is analyzed by considering the total harmonic distortion (THD) of the source current and the absolute reference tracking error of the filter current as a measure to evaluate its robustness.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"73 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"85982954","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 : 2018-05-13DOI: 10.1109/ICHQP.2018.8378823
Thais M. Mendes, C. Duque, L. Silva, D. Ferreira, P. Ribeiro, Jan Meyer, Anne Grevener
Researchers and standard-setting organizations recently have paid much attention to power quality disturbances in the frequency range between 2–150 kHz, which is also referred to as supraharmonics. The majority of the commercial PQ monitors cannot access this high frequency without hardware and firmware update for more complex processor and Analog to Digital Converter. The central focus of this work is to present a technique to access the supraharmonics without significantly modification of the hardware and software of the PQ analyzers. The technique is based on analog filter banks and subsampling approach. The use of subsampling technique allows the reduction of the number of samples processed by the Fast Fourier Transform FFT. Through a systematic analysis, it was verified that the proposed methodology reduces computational complexity.
{"title":"Supraharmonic analysis using subsampling","authors":"Thais M. Mendes, C. Duque, L. Silva, D. Ferreira, P. Ribeiro, Jan Meyer, Anne Grevener","doi":"10.1109/ICHQP.2018.8378823","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378823","url":null,"abstract":"Researchers and standard-setting organizations recently have paid much attention to power quality disturbances in the frequency range between 2–150 kHz, which is also referred to as supraharmonics. The majority of the commercial PQ monitors cannot access this high frequency without hardware and firmware update for more complex processor and Analog to Digital Converter. The central focus of this work is to present a technique to access the supraharmonics without significantly modification of the hardware and software of the PQ analyzers. The technique is based on analog filter banks and subsampling approach. The use of subsampling technique allows the reduction of the number of samples processed by the Fast Fourier Transform FFT. Through a systematic analysis, it was verified that the proposed methodology reduces computational complexity.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"53 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"80677113","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 : 2018-05-13DOI: 10.1109/ICHQP.2018.8378919
Yeliz Yoldas, A. Onen, I. Alan, R. Broadwater
Distribution automation affects reliability by providing faster restoration ability. In this study, the effect of distribution automation on radial distribution circuits during substation failures at peak load is investigated. The ultimate goal is to compare circuit automation to manual operation, where the comparison evaluates planning criteria reliability for customer interruption hours. The results show that distribution automation can improve reliability measurements such as SAIDI, SAIFI and CAIDI.
{"title":"Distribution automation effects on reliability during major contingencies","authors":"Yeliz Yoldas, A. Onen, I. Alan, R. Broadwater","doi":"10.1109/ICHQP.2018.8378919","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378919","url":null,"abstract":"Distribution automation affects reliability by providing faster restoration ability. In this study, the effect of distribution automation on radial distribution circuits during substation failures at peak load is investigated. The ultimate goal is to compare circuit automation to manual operation, where the comparison evaluates planning criteria reliability for customer interruption hours. The results show that distribution automation can improve reliability measurements such as SAIDI, SAIFI and CAIDI.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"53 1","pages":"1-5"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84686889","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 : 2018-05-13DOI: 10.1109/ICHQP.2018.8378820
Ming Liu, Jing Yong, Xiaojing Wang, Jiaming Lu
In the process of non-intrusive load monitoring, the first step is to find the switching on/off events as accurate as possible. However, there are extensive disturbances in the recorded data, due to the voltage fluctuations, electrical noise and etc, resulting in either false detection or event missing. To solve this problem, a new event detection technique is proposed in this paper. This technique uses median filter algorithm and the proposed ripple mitigation algorithm to effectively remove the unexpected disturbances and extract the real signal of switching on/off events. The proposed algorithms are very easy to implement in the low cost devices. The lab data and BLUED data tests show more than 90% accurate rate of event detection.
{"title":"A new event detection technique for residential load monitoring","authors":"Ming Liu, Jing Yong, Xiaojing Wang, Jiaming Lu","doi":"10.1109/ICHQP.2018.8378820","DOIUrl":"https://doi.org/10.1109/ICHQP.2018.8378820","url":null,"abstract":"In the process of non-intrusive load monitoring, the first step is to find the switching on/off events as accurate as possible. However, there are extensive disturbances in the recorded data, due to the voltage fluctuations, electrical noise and etc, resulting in either false detection or event missing. To solve this problem, a new event detection technique is proposed in this paper. This technique uses median filter algorithm and the proposed ripple mitigation algorithm to effectively remove the unexpected disturbances and extract the real signal of switching on/off events. The proposed algorithms are very easy to implement in the low cost devices. The lab data and BLUED data tests show more than 90% accurate rate of event detection.","PeriodicalId":6506,"journal":{"name":"2018 18th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"49 1","pages":"1-6"},"PeriodicalIF":0.0,"publicationDate":"2018-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"89586304","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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