Pub Date : 2010-06-15DOI: 10.1109/ISNCC.2010.5524491
J. Mikulović, T. Šekara
The paper surveys the apparent power definition for nonsinusoidal unbalanced polyphase systems. Based on fact that zero-sequence voltages do not contribute to the instantaneous power, a new formulation of apparent power in terms of any voltage reference has been proposed.
{"title":"A new formulation of apparent power for nonsinusoidal unbalanced polyphase systems","authors":"J. Mikulović, T. Šekara","doi":"10.1109/ISNCC.2010.5524491","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524491","url":null,"abstract":"The paper surveys the apparent power definition for nonsinusoidal unbalanced polyphase systems. Based on fact that zero-sequence voltages do not contribute to the instantaneous power, a new formulation of apparent power in terms of any voltage reference has been proposed.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"30 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134646562","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524479
I. A. Sirotin
The paper offers Δ- optimal Fryze's compensator with LC elements under asymmetrical voltage and unbalanced load. Results of numeric modeling are given.
{"title":"LC - Fryze's compensator under asymmetrical voltage","authors":"I. A. Sirotin","doi":"10.1109/ISNCC.2010.5524479","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524479","url":null,"abstract":"The paper offers Δ- optimal Fryze's compensator with LC elements under asymmetrical voltage and unbalanced load. Results of numeric modeling are given.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"62 3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123230964","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524520
A. Bitoleanu, M. Popescu, V. Suru
This paper presents an analysis of Akagi's p–q theory for active filtering under real nonsinusoidal voltage conditions. It is ascertained that compensating the alternative parts of the instantaneous active and reactive powers leads to a sinusoidal power source current only under sinusoidal voltage conditions. The mathematical demonstration is found and it is verified on some practical examples. It is shown that the difference between Akagi's active current and the true active current is very small for operation under real conditions of voltage total harmonic distortion factor below 10%. A modified definition of the active component of the current is proposed for operation under nonsinusoidal voltage conditions. The DC motor and full control rectifier driving system is used as a case study. Finally, a mathematical inconsequence that put under uncertainty the p–q theory correctness under nonsinusoidal voltage conditions is pointed out.
{"title":"p–q power theory: Some theoretical and practical aspects","authors":"A. Bitoleanu, M. Popescu, V. Suru","doi":"10.1109/ISNCC.2010.5524520","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524520","url":null,"abstract":"This paper presents an analysis of Akagi's p–q theory for active filtering under real nonsinusoidal voltage conditions. It is ascertained that compensating the alternative parts of the instantaneous active and reactive powers leads to a sinusoidal power source current only under sinusoidal voltage conditions. The mathematical demonstration is found and it is verified on some practical examples. It is shown that the difference between Akagi's active current and the true active current is very small for operation under real conditions of voltage total harmonic distortion factor below 10%. A modified definition of the active component of the current is proposed for operation under nonsinusoidal voltage conditions. The DC motor and full control rectifier driving system is used as a case study. Finally, a mathematical inconsequence that put under uncertainty the p–q theory correctness under nonsinusoidal voltage conditions is pointed out.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"13 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132165907","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524513
L. Furmankiewicz
The paper concerns the method of the correction of frequency errors of input circuits, elaborated for correction of module errors and phase errors of linear input circuits. The method is implemented in the spectral domain in a programmed manner. The author presents the findings of experimental research which show the efficiency of the method in measurements of rms value of nonsinusoidal current within the range of linear and nonlinear processing characteristics of a current transformer.
{"title":"The properties of the method of frequency errors correction of input circuits within the range of nonlinear operation","authors":"L. Furmankiewicz","doi":"10.1109/ISNCC.2010.5524513","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524513","url":null,"abstract":"The paper concerns the method of the correction of frequency errors of input circuits, elaborated for correction of module errors and phase errors of linear input circuits. The method is implemented in the spectral domain in a programmed manner. The author presents the findings of experimental research which show the efficiency of the method in measurements of rms value of nonsinusoidal current within the range of linear and nonlinear processing characteristics of a current transformer.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125408338","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 : 2010-06-15DOI: 10.1109/ISNCC.2010.5524475
E. Watanabe, M. Aredes, J. Afonso, J. G. Pinto, L. Monteiro, H. Akagi
The main objective of this tutorial is to present the basic concepts on the instantaneous p–q Theory and then show its applicability for controlling switching converters connected in a micro-grid. These converters can be used for connecting renewable energy sources (solar, wind, and others) to the micro-grids or for harmonic, reactive power or unbalance compensation, and even for voltage regulation. The emphasis is given on the compensation characteristics derived from the p–q Theory, and simulation results of test cases are shown. Special attention is put on the oscillating component of the instantaneous real power, as it may produce torque oscillations or frequency variations in weak systems (micro-grids) generators. This oscillating component, as defined in the p–q Theory, gives the amount of oscillating energy between the source and the load, and its compensation through a switching compensator must have an energy storage element to exchange it with the load. With the p–q Theory this energy storage element can be easily calculated as a function of the average component of the instantaneous real power, which depends on the observation period.
{"title":"Instantaneous p–q power theory for control of compensators in micro-grids","authors":"E. Watanabe, M. Aredes, J. Afonso, J. G. Pinto, L. Monteiro, H. Akagi","doi":"10.1109/ISNCC.2010.5524475","DOIUrl":"https://doi.org/10.1109/ISNCC.2010.5524475","url":null,"abstract":"The main objective of this tutorial is to present the basic concepts on the instantaneous p–q Theory and then show its applicability for controlling switching converters connected in a micro-grid. These converters can be used for connecting renewable energy sources (solar, wind, and others) to the micro-grids or for harmonic, reactive power or unbalance compensation, and even for voltage regulation. The emphasis is given on the compensation characteristics derived from the p–q Theory, and simulation results of test cases are shown. Special attention is put on the oscillating component of the instantaneous real power, as it may produce torque oscillations or frequency variations in weak systems (micro-grids) generators. This oscillating component, as defined in the p–q Theory, gives the amount of oscillating energy between the source and the load, and its compensation through a switching compensator must have an energy storage element to exchange it with the load. With the p–q Theory this energy storage element can be easily calculated as a function of the average component of the instantaneous real power, which depends on the observation period.","PeriodicalId":371843,"journal":{"name":"2010 International School on Nonsinusoidal Currents and Compensation","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128440491","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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