Pub Date : 2008-06-10DOI: 10.1109/ISNCC.2008.4627509
A. Kempski, R. Smoleński, P. Lezynski
In the paper we have investigated the EMC aspects of the proposed modulation algorithm in the comparison with the conventional carrier-based SVPWM. Our results showed that the choice of this modulation causes that the conditions for the compensation, by means of zero common mode (CM) voltage filter, become more favorable then in a case of the conventional SVPWM. In spite of the fact that frequencies of gate pulses are the same in both modulations, the CM voltage frequency is doubled. The time durations of the CM voltage shelves decreases twice and consequently the time integral value of the CM voltage and the magnetizing current decrease as well. This results in reduction of the size, weight and cost of inductive components of filters in multilevel drives.
{"title":"Conditions of CM voltage cancellation in multilevel voltage inverters with conventional and improved carrier-based SVPWM","authors":"A. Kempski, R. Smoleński, P. Lezynski","doi":"10.1109/ISNCC.2008.4627509","DOIUrl":"https://doi.org/10.1109/ISNCC.2008.4627509","url":null,"abstract":"In the paper we have investigated the EMC aspects of the proposed modulation algorithm in the comparison with the conventional carrier-based SVPWM. Our results showed that the choice of this modulation causes that the conditions for the compensation, by means of zero common mode (CM) voltage filter, become more favorable then in a case of the conventional SVPWM. In spite of the fact that frequencies of gate pulses are the same in both modulations, the CM voltage frequency is doubled. The time durations of the CM voltage shelves decreases twice and consequently the time integral value of the CM voltage and the magnetizing current decrease as well. This results in reduction of the size, weight and cost of inductive components of filters in multilevel drives.","PeriodicalId":143815,"journal":{"name":"2008 International School on Nonsinusoidal Currents and Compensation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114747044","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 : 2008-06-10DOI: 10.1109/ISNCC.2008.4627486
M. Hartman, M. Hashad
Numerous publications point out that each of the so far presented proposals how to describe power states has some defects, they all lack the physical interpretation or the universal character. Yet, the application of a given power theory to analyze the electric circuit was not preceded by the proof of the rightness of such a procedure in relation to the character of this circuit. The authors of this paper seek the answer to the question whether a given power theory can be successfully applied in the analysis of both linear and non-linear circuits.
{"title":"A few remarks on the analysis of energy transfer through any periodic current and voltage waveforms","authors":"M. Hartman, M. Hashad","doi":"10.1109/ISNCC.2008.4627486","DOIUrl":"https://doi.org/10.1109/ISNCC.2008.4627486","url":null,"abstract":"Numerous publications point out that each of the so far presented proposals how to describe power states has some defects, they all lack the physical interpretation or the universal character. Yet, the application of a given power theory to analyze the electric circuit was not preceded by the proof of the rightness of such a procedure in relation to the character of this circuit. The authors of this paper seek the answer to the question whether a given power theory can be successfully applied in the analysis of both linear and non-linear circuits.","PeriodicalId":143815,"journal":{"name":"2008 International School on Nonsinusoidal Currents and Compensation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117296662","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 : 2008-06-10DOI: 10.1109/ISNCC.2008.4627517
J. Luszcz, I. Moson
Many problems related to the voltage and current harmonics imposed in contemporary power systems are observed nowadays. The paper presents the voltage harmonic transfer capability of the voltage transformer usually used for the power quality measurement in the middle and high voltage grids. A simplified lumped parameters circuit model of the voltage transformer is proposed and verified by experimental investigations. The results obtained prove that the wide band ripples of the voltage transformer transfer characteristic can result an extra measurement errors that should be taken into account in order to achieve applicable accuracy.
{"title":"Modelling of voltage transformer performance in power system harmonic frequency range","authors":"J. Luszcz, I. Moson","doi":"10.1109/ISNCC.2008.4627517","DOIUrl":"https://doi.org/10.1109/ISNCC.2008.4627517","url":null,"abstract":"Many problems related to the voltage and current harmonics imposed in contemporary power systems are observed nowadays. The paper presents the voltage harmonic transfer capability of the voltage transformer usually used for the power quality measurement in the middle and high voltage grids. A simplified lumped parameters circuit model of the voltage transformer is proposed and verified by experimental investigations. The results obtained prove that the wide band ripples of the voltage transformer transfer characteristic can result an extra measurement errors that should be taken into account in order to achieve applicable accuracy.","PeriodicalId":143815,"journal":{"name":"2008 International School on Nonsinusoidal Currents and Compensation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115889579","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 : 2008-06-10DOI: 10.1109/ISNCC.2008.4627484
H. Ginn, Guangda Chen
A reference generation technique for shunt switching compensators based on currentspsila physical components (CPC) power theory is presented that utilizes a computationally efficient moving-window DFT along with the CPC orthogonal decomposition of the current instead of the filters typically used to extract the desired components of the current. Each orthogonal component of the current can be adjusted independently in any percentage, thus providing selective current compensation. Details of a prototype compensator and experimental results are also presented.
{"title":"Switching compensator control strategy based on CPC power theory","authors":"H. Ginn, Guangda Chen","doi":"10.1109/ISNCC.2008.4627484","DOIUrl":"https://doi.org/10.1109/ISNCC.2008.4627484","url":null,"abstract":"A reference generation technique for shunt switching compensators based on currentspsila physical components (CPC) power theory is presented that utilizes a computationally efficient moving-window DFT along with the CPC orthogonal decomposition of the current instead of the filters typically used to extract the desired components of the current. Each orthogonal component of the current can be adjusted independently in any percentage, thus providing selective current compensation. Details of a prototype compensator and experimental results are also presented.","PeriodicalId":143815,"journal":{"name":"2008 International School on Nonsinusoidal Currents and Compensation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115129323","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 : 2008-06-10DOI: 10.1109/ISNCC.2008.4627511
K. Piatek
In this paper a series connected active compensator is considered. These kind of compensators are a cost-effective solution for the mitigation of supply voltage events. The compensator proposed in the paper allows for voltage waveform restoration, that is compensation of voltage dips, voltage variations, asymmetry and harmonics. A controller which adopts the energy optimised strategy in order to conserve energy stored in the DC side capacitors is also presented. Shift angle between load voltage and supply voltage phasors, which determines injected energy, is computed using only DC voltage signal by means of PI regulator. Effectiveness of the proposed device was tested through numerical simulation, which involved voltage issues caused by a motor start-up and a 1-ph diode bridge load.
{"title":"Series voltage restoration under distorted supply voltage condition","authors":"K. Piatek","doi":"10.1109/ISNCC.2008.4627511","DOIUrl":"https://doi.org/10.1109/ISNCC.2008.4627511","url":null,"abstract":"In this paper a series connected active compensator is considered. These kind of compensators are a cost-effective solution for the mitigation of supply voltage events. The compensator proposed in the paper allows for voltage waveform restoration, that is compensation of voltage dips, voltage variations, asymmetry and harmonics. A controller which adopts the energy optimised strategy in order to conserve energy stored in the DC side capacitors is also presented. Shift angle between load voltage and supply voltage phasors, which determines injected energy, is computed using only DC voltage signal by means of PI regulator. Effectiveness of the proposed device was tested through numerical simulation, which involved voltage issues caused by a motor start-up and a 1-ph diode bridge load.","PeriodicalId":143815,"journal":{"name":"2008 International School on Nonsinusoidal Currents and Compensation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116524214","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 : 2008-06-10DOI: 10.1109/ISNCC.2008.4627501
K. Debowski
The application of fuzzy mathematical programming as optimization technique in one-phase electrical circuits with nonsinusoidal periodical waveforms and linear loads has been presented in the paper. The solution (active current) is determined as crisp one (real numbers) in frequency domain. It is obtained in the numerical way. This optimization leads to determine the source currents with minimal RMS value when the power constraints donpsilat have to be fulfilled strictly. The solution takes into consideration membership functions of power constraint and minimized RMS value of currents.
{"title":"Fuzzy mathematical programming as a tool in optimization of one-phase electrical circuits","authors":"K. Debowski","doi":"10.1109/ISNCC.2008.4627501","DOIUrl":"https://doi.org/10.1109/ISNCC.2008.4627501","url":null,"abstract":"The application of fuzzy mathematical programming as optimization technique in one-phase electrical circuits with nonsinusoidal periodical waveforms and linear loads has been presented in the paper. The solution (active current) is determined as crisp one (real numbers) in frequency domain. It is obtained in the numerical way. This optimization leads to determine the source currents with minimal RMS value when the power constraints donpsilat have to be fulfilled strictly. The solution takes into consideration membership functions of power constraint and minimized RMS value of currents.","PeriodicalId":143815,"journal":{"name":"2008 International School on Nonsinusoidal Currents and Compensation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132145450","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 : 2008-06-10DOI: 10.1109/ISNCC.2008.4627488
J. Willems
This paper discusses the fundamentals of different methods for current decomposition and non-active power compensation in polyphase power systems. The basic concepts and the results of the instantaneous active and reactive power theory on the one side, and of the active/reactive average power theory on the other side, are critically compared.
{"title":"Critical analysis of different current decomposition and compensation schemes","authors":"J. Willems","doi":"10.1109/ISNCC.2008.4627488","DOIUrl":"https://doi.org/10.1109/ISNCC.2008.4627488","url":null,"abstract":"This paper discusses the fundamentals of different methods for current decomposition and non-active power compensation in polyphase power systems. The basic concepts and the results of the instantaneous active and reactive power theory on the one side, and of the active/reactive average power theory on the other side, are critically compared.","PeriodicalId":143815,"journal":{"name":"2008 International School on Nonsinusoidal Currents and Compensation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133714754","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 : 2008-06-10DOI: 10.1109/ISNCC.2008.4627497
M. Hashad, J. Mindykowski
The criterion currently used for the estimation of proportionality of active and reactive power distribution was introduced by ship classification societies many years ago, when the problem of non-active power compensation was not as serious as today. One of the important questions in the wake of the above-cited criterion is the meaning and interpretation of the Q reactive power. Due to many doubts concerning those aspects, as well as methods of determination of the deltaP and deltaQ coefficient values, a new approach to solve the problem is presented. This approach is based on the concept of the power correlation functions Psi(t), which are the basis for determining sinusoidal power function Psis(t) and cosinusoidal power function Psic(t). The specific mathematical properties of the Psis(t) and Psic(t) functions have been used to estimate the appropriate active and reactive power distribution among generating sets working in parallel in the ship system under consideration. Proposed new algorithm for solving above mentioned problem and related calculations is shown on the example of the real ship power station configuration.
{"title":"New algorithm for estimation of correctness of active and reactive power distribution among generating sets operating in parallel","authors":"M. Hashad, J. Mindykowski","doi":"10.1109/ISNCC.2008.4627497","DOIUrl":"https://doi.org/10.1109/ISNCC.2008.4627497","url":null,"abstract":"The criterion currently used for the estimation of proportionality of active and reactive power distribution was introduced by ship classification societies many years ago, when the problem of non-active power compensation was not as serious as today. One of the important questions in the wake of the above-cited criterion is the meaning and interpretation of the Q reactive power. Due to many doubts concerning those aspects, as well as methods of determination of the deltaP and deltaQ coefficient values, a new approach to solve the problem is presented. This approach is based on the concept of the power correlation functions Psi(t), which are the basis for determining sinusoidal power function Psis(t) and cosinusoidal power function Psic(t). The specific mathematical properties of the Psis(t) and Psic(t) functions have been used to estimate the appropriate active and reactive power distribution among generating sets working in parallel in the ship system under consideration. Proposed new algorithm for solving above mentioned problem and related calculations is shown on the example of the real ship power station configuration.","PeriodicalId":143815,"journal":{"name":"2008 International School on Nonsinusoidal Currents and Compensation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124030975","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 : 2008-06-10DOI: 10.1109/ISNCC.2008.4627506
A. Bień
Phase disturbances in electric power signals are neglected and only amplitude (envelope) distortions are discussed in a literature. Amplitude disturbances are interpreted as amplitude modulation (AM) of main 50 Hz frequency. Detailed analysis of all disturbances and their sources are presented in the paper. It is shown that AM and narrow band PM (phase modulation) take place in power network simultaneously and those two modulations interact with each other. Voltage variation is proposed as disturbances measurement. Theoretical results are verified by field experiments and their results are presented.
{"title":"The hilbert transform adaptation for measuring amplitude and phase low-frequency disturbances in power system voltage","authors":"A. Bień","doi":"10.1109/ISNCC.2008.4627506","DOIUrl":"https://doi.org/10.1109/ISNCC.2008.4627506","url":null,"abstract":"Phase disturbances in electric power signals are neglected and only amplitude (envelope) distortions are discussed in a literature. Amplitude disturbances are interpreted as amplitude modulation (AM) of main 50 Hz frequency. Detailed analysis of all disturbances and their sources are presented in the paper. It is shown that AM and narrow band PM (phase modulation) take place in power network simultaneously and those two modulations interact with each other. Voltage variation is proposed as disturbances measurement. Theoretical results are verified by field experiments and their results are presented.","PeriodicalId":143815,"journal":{"name":"2008 International School on Nonsinusoidal Currents and Compensation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127458959","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 : 2008-06-10DOI: 10.1109/ISNCC.2008.4627504
R. Strzelecki, G. Benysek, M. Jarnut
The paper introduces power quality conditioners with minimum number of current sensors. The power balance method for active conditioners control is introduced as well. Some investigation results of implemented solution are depicted to prove effectiveness of proposed arrangements.
{"title":"Power quality conditioners with minimum number of current sensor requirement","authors":"R. Strzelecki, G. Benysek, M. Jarnut","doi":"10.1109/ISNCC.2008.4627504","DOIUrl":"https://doi.org/10.1109/ISNCC.2008.4627504","url":null,"abstract":"The paper introduces power quality conditioners with minimum number of current sensors. The power balance method for active conditioners control is introduced as well. Some investigation results of implemented solution are depicted to prove effectiveness of proposed arrangements.","PeriodicalId":143815,"journal":{"name":"2008 International School on Nonsinusoidal Currents and Compensation","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2008-06-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114521382","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：