Pub Date : 2014-05-25DOI: 10.1109/ICHQP.2014.6842797
T. C. O. Carvalho, C. Duque, P. Silveira, M. Mendes, P. Ribeiro
Traditional analysis of waveform distortion assumes balanced and steady-state conditions. However, due to the widespread use of power electronics, non-linear loads and a multiplicity of harmonic-producing loads, power signals are becoming increasingly distorted and time varying. This complex scenario demands appropriate analysis. This paper illustrates the visualization of power quantities under time-varying conditions based on the defitions of IEEE Standard 1459. The Sliding Window Recursive Fourier Transform is used to decompose real signals in time-varying harmonics and subsequently it calculates the main parameters as function of time. These include symmetrical components, total harmonic distortions and apparent power. This visulization can lead to a better understanding of the nature of power signals under time-varying conditions.
{"title":"Visualizing power quantities under non-sinusoidal and time-varying conditions","authors":"T. C. O. Carvalho, C. Duque, P. Silveira, M. Mendes, P. Ribeiro","doi":"10.1109/ICHQP.2014.6842797","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842797","url":null,"abstract":"Traditional analysis of waveform distortion assumes balanced and steady-state conditions. However, due to the widespread use of power electronics, non-linear loads and a multiplicity of harmonic-producing loads, power signals are becoming increasingly distorted and time varying. This complex scenario demands appropriate analysis. This paper illustrates the visualization of power quantities under time-varying conditions based on the defitions of IEEE Standard 1459. The Sliding Window Recursive Fourier Transform is used to decompose real signals in time-varying harmonics and subsequently it calculates the main parameters as function of time. These include symmetrical components, total harmonic distortions and apparent power. This visulization can lead to a better understanding of the nature of power signals under time-varying conditions.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"668 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":"122968066","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.2014.6842759
Shunfu Lin, Qingqiang Liu, Xiaoxia Zheng, Dongdong Li
The decomposed information of power consumption of household appliances is meaningful for scheduling the appliances and the reduction in home energy use. This paper presents a novel nonintrusive load identification method based on continuous quadratic 0-1 programming. Extensive lab tests have demonstrated that the proposed technique can provide adequate load identification accuracy for residential energy monitoring and is suitable to be used in a nonintrusive load monitoring (NILM) systems in residential and commercial buildings.
{"title":"Algorithm for residential appliance identification based on continuous quadratic 0–1 programming","authors":"Shunfu Lin, Qingqiang Liu, Xiaoxia Zheng, Dongdong Li","doi":"10.1109/ICHQP.2014.6842759","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842759","url":null,"abstract":"The decomposed information of power consumption of household appliances is meaningful for scheduling the appliances and the reduction in home energy use. This paper presents a novel nonintrusive load identification method based on continuous quadratic 0-1 programming. Extensive lab tests have demonstrated that the proposed technique can provide adequate load identification accuracy for residential energy monitoring and is suitable to be used in a nonintrusive load monitoring (NILM) systems in residential and commercial buildings.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"18 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":"133070775","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.2014.6842842
S. Müller, F. Möller, Jan Meyer, A. Collin, S. Djokic
This paper presents and discusses some initial results of the measurement and assessment of the harmonic characteristics of electric vehicle (EV) chargers and photovoltaic (PV) inverters, which are tested individually and when connected in different combinations to the same phase of a programmable three-phase LV supply in the laboratory. The range of possible harmonic interactions is assessed for three source impedance values and three characteristic supply voltage waveforms. The presented results can help in understanding how the exchange of energy between the grid, power electronic loads (EV chargers) and inverter-interfaced distributed generation (PV inverters) could be assessed in terms of the anticipated “smart grid” transformation of electricity networks.
{"title":"Characterisation of harmonic interactions between electric vehicle battery chargers and PV inverters","authors":"S. Müller, F. Möller, Jan Meyer, A. Collin, S. Djokic","doi":"10.1109/ICHQP.2014.6842842","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842842","url":null,"abstract":"This paper presents and discusses some initial results of the measurement and assessment of the harmonic characteristics of electric vehicle (EV) chargers and photovoltaic (PV) inverters, which are tested individually and when connected in different combinations to the same phase of a programmable three-phase LV supply in the laboratory. The range of possible harmonic interactions is assessed for three source impedance values and three characteristic supply voltage waveforms. The presented results can help in understanding how the exchange of energy between the grid, power electronic loads (EV chargers) and inverter-interfaced distributed generation (PV inverters) could be assessed in terms of the anticipated “smart grid” transformation of electricity networks.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"1 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":"134031502","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.2014.6842796
T. C. O. Carvalho, C. Duque, P. Silveira, M. Mendes, P. Ribeiro
Traditional harmonic distortion analysis assumes balanced and steady-state conditions. Moreover, harmonic components are often associated with certain sequences (positive, negative or zero). However, in reality unbalance causes the existence of all sorts of sequences for every frequency. Additionally, time-varying conditions complicate analysis and require appropriate models. Many of the time-varying unbalances, especially at higher frequencies, have not been discussed in detail before. This paper uses the Slide Window Recursive Fourier Transform to compute the time-varying harmonic components and then calculates and plots the positive, negative and zero sequences and parameters for each frequency. Recorded signals from a real system are used for this analysis. These time-varying parameters can then be used to further investigate the nature of some transient phenomena and for providing information for protection and control applications as the grid becomes smarter and more complex.
{"title":"Observing time-varying unbalances and asymmetries at harmonic frequencies","authors":"T. C. O. Carvalho, C. Duque, P. Silveira, M. Mendes, P. Ribeiro","doi":"10.1109/ICHQP.2014.6842796","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842796","url":null,"abstract":"Traditional harmonic distortion analysis assumes balanced and steady-state conditions. Moreover, harmonic components are often associated with certain sequences (positive, negative or zero). However, in reality unbalance causes the existence of all sorts of sequences for every frequency. Additionally, time-varying conditions complicate analysis and require appropriate models. Many of the time-varying unbalances, especially at higher frequencies, have not been discussed in detail before. This paper uses the Slide Window Recursive Fourier Transform to compute the time-varying harmonic components and then calculates and plots the positive, negative and zero sequences and parameters for each frequency. Recorded signals from a real system are used for this analysis. These time-varying parameters can then be used to further investigate the nature of some transient phenomena and for providing information for protection and control applications as the grid becomes smarter and more complex.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"120 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":"128014560","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.2014.6842746
K. Redondo, A. Lazkano, P. Sáiz, J. Gutiérrez, L. Leturiondo, I. Azkarate
Quantification of the flicker generated by wind turbines is a rather complex process requiring high-precision measurements. Based on the measurements of voltage and current time-series, the procedure uses an inductive circuit model to make the final measurements site-independent. This paper presents a study on the inaccuracy introduced by the numerical algorithms in calculating the derivative of the sampled signal when evaluating the flicker emission of wind turbines. It describes the alternatives found in the digital signal processing literature, and presents a comparative study of the results using analytically generated signals. The application of differentiation methods to the actual signal data of a wind turbine showed that depending on the implemented method, the differences in flicker emission quantification could be significant.
{"title":"Effects of digital differentiation on flicker measurements in wind turbines","authors":"K. Redondo, A. Lazkano, P. Sáiz, J. Gutiérrez, L. Leturiondo, I. Azkarate","doi":"10.1109/ICHQP.2014.6842746","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842746","url":null,"abstract":"Quantification of the flicker generated by wind turbines is a rather complex process requiring high-precision measurements. Based on the measurements of voltage and current time-series, the procedure uses an inductive circuit model to make the final measurements site-independent. This paper presents a study on the inaccuracy introduced by the numerical algorithms in calculating the derivative of the sampled signal when evaluating the flicker emission of wind turbines. It describes the alternatives found in the digital signal processing literature, and presents a comparative study of the results using analytically generated signals. The application of differentiation methods to the actual signal data of a wind turbine showed that depending on the implemented method, the differences in flicker emission quantification could be significant.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"33 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":"129206305","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.2014.6842784
A. Etumi, F. Anayi, A. Fahmy, E. Eldukhri
A new algorithm based on correlation coefficients analysis of waveforms to detect an internal fault occurs in three phase transformer is proposed. The algorithm depends on the changes in current waveform that occur during internal fault. Auto-correlation has been added to cross-correlation algorithm for enhancing the security and speed in detecting the fault within very short time. It is able to detect the fault after just 0.4 msec from incidence of fault occurrence. The scheme has been tested by using Matlab/Simulink software [1]. The test results show that the internal fault even inter-turn type can be correctly identified from external fault. The algorithm is simple and can be experimentally implemented.
{"title":"Auto-cross correlation coefficients used for detecting an internal fault in three phase transformer","authors":"A. Etumi, F. Anayi, A. Fahmy, E. Eldukhri","doi":"10.1109/ICHQP.2014.6842784","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842784","url":null,"abstract":"A new algorithm based on correlation coefficients analysis of waveforms to detect an internal fault occurs in three phase transformer is proposed. The algorithm depends on the changes in current waveform that occur during internal fault. Auto-correlation has been added to cross-correlation algorithm for enhancing the security and speed in detecting the fault within very short time. It is able to detect the fault after just 0.4 msec from incidence of fault occurrence. The scheme has been tested by using Matlab/Simulink software [1]. The test results show that the internal fault even inter-turn type can be correctly identified from external fault. The algorithm is simple and can be experimentally implemented.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"94 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":"128638541","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.2014.6842884
G. Lazaroiu, M. Costoiu, C. Carstea, N. Golovanov, O. Udrea, M. Roscia
The present paper deals with the case study of an existing ac arc furnace facility. A field measuring campaign was carried out for an industrial consumer. One of the many aspects of power quality that can affect electricity users is voltage fluctuation that causes lights to flicker. The main power quality indices regarding flicker levels are reported in the paper with reference to the current standards.
{"title":"Power quality management in a syderurgic factory","authors":"G. Lazaroiu, M. Costoiu, C. Carstea, N. Golovanov, O. Udrea, M. Roscia","doi":"10.1109/ICHQP.2014.6842884","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842884","url":null,"abstract":"The present paper deals with the case study of an existing ac arc furnace facility. A field measuring campaign was carried out for an industrial consumer. One of the many aspects of power quality that can affect electricity users is voltage fluctuation that causes lights to flicker. The main power quality indices regarding flicker levels are reported in the paper with reference to the current standards.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"42 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":"128662990","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.2014.6842793
M. Qasim, V. Khadkikar
Adaptive linear neuron (ADALINE) is a powerful estimation technique that has been used in power system applications, such as fault detection and classification, and shunt active power filter (APF). In this paper, an ADALINE based approach for control of three-phase three-wire unified power quality conditioner (UPQC) is presented. Two ADALINEs are used in the UPQC control strategy, one for load current fundamental extraction, and other for supply voltage fundamental extraction. The proposed method is evaluated through simulation studies in Matlab/Simulink environment. The ADALINE based UPQC is validated under several operating conditions. It is found that the UPQC can compensate for power quality issues, such as supply voltage harmonics, voltage sag and swell, load current harmonics, and load reactive power.
{"title":"ADALINE based control strategy for three-phase three-wire UPQC system","authors":"M. Qasim, V. Khadkikar","doi":"10.1109/ICHQP.2014.6842793","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842793","url":null,"abstract":"Adaptive linear neuron (ADALINE) is a powerful estimation technique that has been used in power system applications, such as fault detection and classification, and shunt active power filter (APF). In this paper, an ADALINE based approach for control of three-phase three-wire unified power quality conditioner (UPQC) is presented. Two ADALINEs are used in the UPQC control strategy, one for load current fundamental extraction, and other for supply voltage fundamental extraction. The proposed method is evaluated through simulation studies in Matlab/Simulink environment. The ADALINE based UPQC is validated under several operating conditions. It is found that the UPQC can compensate for power quality issues, such as supply voltage harmonics, voltage sag and swell, load current harmonics, and load reactive power.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"11 2 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":"128566250","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.2014.6842839
Jurgens J. J. Cornelius, J. van Rensburg, D. Nicolae
Most non-sinusoidal power theories have been developed from theoretical techniques, as well as relying on hypothetical and experimental networks to highlight the advantages of each. The drawback of the power theories is that no single one has been universally accepted as a benchmark for other developments. This paper will however show this weakness by means of evaluating two power theories in the time domain, using real recorded data.
{"title":"Another case of discrepancies when evaluating power theories using real data","authors":"Jurgens J. J. Cornelius, J. van Rensburg, D. Nicolae","doi":"10.1109/ICHQP.2014.6842839","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842839","url":null,"abstract":"Most non-sinusoidal power theories have been developed from theoretical techniques, as well as relying on hypothetical and experimental networks to highlight the advantages of each. The drawback of the power theories is that no single one has been universally accepted as a benchmark for other developments. This paper will however show this weakness by means of evaluating two power theories in the time domain, using real recorded data.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"1 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":"129068982","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.2014.6842922
Kai-Tsang Yang, M. Bollen, E. Larsson
The paper presents current harmonic and inter-harmonic measurement of a Type-IV wind turbine. Characterizations and classifications have been performed with the representation of harmonics and interharmonics in a complex plane. The study of aggregations due to the summation of complex currents has been performed based on Monte-Carlo Simulation for harmonics and inter-harmonics. Aggregations occur less for low-order harmonics, more for high-order harmonics and most for inter-harmonics. Aggregations are shown to be largely independent of the produced power.
{"title":"Wind power harmonic aggregation of multiple turbines in power bins","authors":"Kai-Tsang Yang, M. Bollen, E. Larsson","doi":"10.1109/ICHQP.2014.6842922","DOIUrl":"https://doi.org/10.1109/ICHQP.2014.6842922","url":null,"abstract":"The paper presents current harmonic and inter-harmonic measurement of a Type-IV wind turbine. Characterizations and classifications have been performed with the representation of harmonics and interharmonics in a complex plane. The study of aggregations due to the summation of complex currents has been performed based on Monte-Carlo Simulation for harmonics and inter-harmonics. Aggregations occur less for low-order harmonics, more for high-order harmonics and most for inter-harmonics. Aggregations are shown to be largely independent of the produced power.","PeriodicalId":188461,"journal":{"name":"2014 16th International Conference on Harmonics and Quality of Power (ICHQP)","volume":"15 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":"116675831","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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