Pub Date : 2014-09-29DOI: 10.1109/EPE.2014.6910905
S. Gunter, F. Fuchs
The measurement of the grid impedance is important for filter and control design, for active filter functionality of grid connected inverters and also for distribution network operators. It supports knowledge of the grid and design of decentralized energy generator power flow. Not only the impedance at fundamental frequency but also the impedance at harmonic and interharmonic frequencies is of common interest. With an inverter injecting a current at an individual frequency onto the power system, the real frequency dependent value of the grid impedance can be determined. A digital hysteresis current control is a promising method to control a voltage source inverter (VSI) for high frequency current generation in grid impedance measurement application. Digital signal processing is state of the art, but the speed of the analog to digital conversion is limited. When using hysteresis current control the outcome of this is that the current leaves the defined hysteresis band because of the time discrete sampling. In this paper a method using switching time prediction to minimize this current overshoot is proposed and analyzed. Simulation and measurement results are presented that show the suitability of this method.
{"title":"Switching time prediction for digital hysteresis control for high frequency current in grid impedance measurement application","authors":"S. Gunter, F. Fuchs","doi":"10.1109/EPE.2014.6910905","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910905","url":null,"abstract":"The measurement of the grid impedance is important for filter and control design, for active filter functionality of grid connected inverters and also for distribution network operators. It supports knowledge of the grid and design of decentralized energy generator power flow. Not only the impedance at fundamental frequency but also the impedance at harmonic and interharmonic frequencies is of common interest. With an inverter injecting a current at an individual frequency onto the power system, the real frequency dependent value of the grid impedance can be determined. A digital hysteresis current control is a promising method to control a voltage source inverter (VSI) for high frequency current generation in grid impedance measurement application. Digital signal processing is state of the art, but the speed of the analog to digital conversion is limited. When using hysteresis current control the outcome of this is that the current leaves the defined hysteresis band because of the time discrete sampling. In this paper a method using switching time prediction to minimize this current overshoot is proposed and analyzed. Simulation and measurement results are presented that show the suitability of this method.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"5 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"72981884","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910993
Xiaoxin Wang, Qiongxuan Ge, Ming Lei, Yang Yu, Yao-hua Li
By now the modular multilevel converter (MMC) is mainly applied to high frequency applications (50 or 60Hz) especially in the field of HVDC systems. This paper presents a control scheme for modular multilevel converter, which allows the converter to operate at continuous coverage in the 0Hz to 50Hz frequency band.
{"title":"Control scheme of modular multilevel converter for AC drive applications","authors":"Xiaoxin Wang, Qiongxuan Ge, Ming Lei, Yang Yu, Yao-hua Li","doi":"10.1109/EPE.2014.6910993","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910993","url":null,"abstract":"By now the modular multilevel converter (MMC) is mainly applied to high frequency applications (50 or 60Hz) especially in the field of HVDC systems. This paper presents a control scheme for modular multilevel converter, which allows the converter to operate at continuous coverage in the 0Hz to 50Hz frequency band.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"8 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86034651","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910717
T. Schulte, G. Schroder
In this paper a new drive control strategy for matrix converters is presented that lowers significantly the harmful common mode voltage. The advanced control method is based on the Direct Torque Control scheme. It is applied exemplarily in this paper by use of a Permanent Magnet Synchronous Machine.
{"title":"Matrix converter with a novel control method","authors":"T. Schulte, G. Schroder","doi":"10.1109/EPE.2014.6910717","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910717","url":null,"abstract":"In this paper a new drive control strategy for matrix converters is presented that lowers significantly the harmful common mode voltage. The advanced control method is based on the Direct Torque Control scheme. It is applied exemplarily in this paper by use of a Permanent Magnet Synchronous Machine.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"13 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88218619","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910990
P. Cortes, D. Bortis, Riccardo Pittini, J. Kolar
Due to the high energy consumption in data and telco centers, the use of 380V or 400V DC facility-level distribution has been proposed as an alternative to the conventional AC distribution for a more efficient power delivery structure. The DC voltage is powered from the three-phase mains by a PFC rectifier and in many cases a mains transformer is used to provide galvanic isolation. In order to achieve a high efficiency in the DC voltage generation and to implement the required isolation, a single-stage concept, such as a matrix-type rectifier that enables PFC functionality and galvanic isolation in a single conversion, can be beneficial. In addition, due to the fact that with the matrix-type rectifier the galvanic isolation is performed with a high-frequency transformer, this results in a more compact rectifier system compared to conventional systems where the mains-frequency isolation transformer is located at the input of the PFC rectifier. In this paper, an overview of isolated matrix-type PFC rectifier topologies is given and a new converter circuit is proposed, analyzed and comparatively evaluated against another promising PFC rectifier concept, the phase-modular IMY-rectifier.
{"title":"Comparative evaluation of three-phase isolated matrix-type PFC rectifier concepts for high efficiency 380VDC supplies of future telco and data centers","authors":"P. Cortes, D. Bortis, Riccardo Pittini, J. Kolar","doi":"10.1109/EPE.2014.6910990","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910990","url":null,"abstract":"Due to the high energy consumption in data and telco centers, the use of 380V or 400V DC facility-level distribution has been proposed as an alternative to the conventional AC distribution for a more efficient power delivery structure. The DC voltage is powered from the three-phase mains by a PFC rectifier and in many cases a mains transformer is used to provide galvanic isolation. In order to achieve a high efficiency in the DC voltage generation and to implement the required isolation, a single-stage concept, such as a matrix-type rectifier that enables PFC functionality and galvanic isolation in a single conversion, can be beneficial. In addition, due to the fact that with the matrix-type rectifier the galvanic isolation is performed with a high-frequency transformer, this results in a more compact rectifier system compared to conventional systems where the mains-frequency isolation transformer is located at the input of the PFC rectifier. In this paper, an overview of isolated matrix-type PFC rectifier topologies is given and a new converter circuit is proposed, analyzed and comparatively evaluated against another promising PFC rectifier concept, the phase-modular IMY-rectifier.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"8 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84697406","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910922
K. Rykov, L. Ott, J. Duarte, E. Lomonova
The paper focuses on small-signal analysis of aggregated operation of the low-voltage DC-grids comprising various power and load modules. Complex impedances, which can be identified experimentally, represent the internal structure of power converters and may become a reason for voltage instabilities while being gathered together in the DC-grid using cables. The paper proposes ideas to analyze and forecast possible resonance issues of parallel operation of power modules in the test model of the 380V DC-grid and make recommendations in order to avoid them.
{"title":"Modelling of aggregated operation of power modules in low-voltage DC-grids","authors":"K. Rykov, L. Ott, J. Duarte, E. Lomonova","doi":"10.1109/EPE.2014.6910922","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910922","url":null,"abstract":"The paper focuses on small-signal analysis of aggregated operation of the low-voltage DC-grids comprising various power and load modules. Complex impedances, which can be identified experimentally, represent the internal structure of power converters and may become a reason for voltage instabilities while being gathered together in the DC-grid using cables. The paper proposes ideas to analyze and forecast possible resonance issues of parallel operation of power modules in the test model of the 380V DC-grid and make recommendations in order to avoid them.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"27 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84848408","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910910
A. Jaafar, G. Bergna, J. Vannier, P. Lefranc
The Interconnection and Damping Assignment Passivity-Based Control (IDAPBC) is applied phase-independently to the Modular Multilevel Converter (MMC) in order to overcome “dqo”-based control problems. In addition, an equilibrium point estimator is proposed to determine the time-varying equilibrium state of the MMC needed as input for the non-linear controller. This control strategy provides global robust stabilization of the MMC against variations on both its AC and DC sides. The control + estimator strategy combines both the state-space and energy dynamics models of the MMC.
{"title":"Energy concept-based nonlinear stabilization and control for Modular Multilevel Converters for voltage oscillation reduction","authors":"A. Jaafar, G. Bergna, J. Vannier, P. Lefranc","doi":"10.1109/EPE.2014.6910910","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910910","url":null,"abstract":"The Interconnection and Damping Assignment Passivity-Based Control (IDAPBC) is applied phase-independently to the Modular Multilevel Converter (MMC) in order to overcome “dqo”-based control problems. In addition, an equilibrium point estimator is proposed to determine the time-varying equilibrium state of the MMC needed as input for the non-linear controller. This control strategy provides global robust stabilization of the MMC against variations on both its AC and DC sides. The control + estimator strategy combines both the state-space and energy dynamics models of the MMC.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"40 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83020821","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910803
A. Mattsson, P. Nuutinen, T. Kaipia, P. Peltoniemi, P. Silventoinen, J. Partanen
In this paper the implementation of a modular customer-end inverter (CEI) for a low voltage DC (LVDC) distribution network is discussed. Selection of the nominal power of one inverter module, the effect of the switching frequency and input DC voltage on the lifetime cost is studied. The design goal is set for minimum lifetime cost of the inverter and therefore, investment cost and losses are studied. A load profile of a typical customer group that would be connected to the LVDC distribution network is used in the loss calculation to determine a better approximation of the losses of the system in a real world application and how this affects the design.
{"title":"Implementation of a modular customer-end inverter for a low voltage DC distribution network","authors":"A. Mattsson, P. Nuutinen, T. Kaipia, P. Peltoniemi, P. Silventoinen, J. Partanen","doi":"10.1109/EPE.2014.6910803","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910803","url":null,"abstract":"In this paper the implementation of a modular customer-end inverter (CEI) for a low voltage DC (LVDC) distribution network is discussed. Selection of the nominal power of one inverter module, the effect of the switching frequency and input DC voltage on the lifetime cost is studied. The design goal is set for minimum lifetime cost of the inverter and therefore, investment cost and losses are studied. A load profile of a typical customer group that would be connected to the LVDC distribution network is used in the loss calculation to determine a better approximation of the losses of the system in a real world application and how this affects the design.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"1 1","pages":"1-10"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90848180","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910829
C. Wong, Yuk-Ming Lai, K. H. Loo, Chi K. Tse
A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. In the approach, two rectangular AC sources are employed so that the output current ripple can be significantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approach is realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering the mandatory lighting standard for an AC/DC LED driver, the half-bridges are preceded by a valley-fill circuit for meeting the input power factor (PF) and current harmonic distortion requirements. Unlike other existing interleaved LED drivers that can only obtain low current ripples in certain operating points, the proposed approach can maintain a constant output current at all times even under large duty cycle dynamics due to the use of a valley-fill circuit. To validate the feasibility of the proposed approach, a 13 W prototype is built and tested experimentally.
{"title":"Elimination of electrolytic capacitor in LED power supplies by two-phase driving approach","authors":"C. Wong, Yuk-Ming Lai, K. H. Loo, Chi K. Tse","doi":"10.1109/EPE.2014.6910829","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910829","url":null,"abstract":"A two-phase driving approach for light-emitting-diode (LED) applications is proposed in this paper. In the approach, two rectangular AC sources are employed so that the output current ripple can be significantly reduced. It leads to the elimination of electrolytic capacitor from the driver circuit. The approach is realised by a dual asymmetrical half-bridge converter with LEDs as the load. Considering the mandatory lighting standard for an AC/DC LED driver, the half-bridges are preceded by a valley-fill circuit for meeting the input power factor (PF) and current harmonic distortion requirements. Unlike other existing interleaved LED drivers that can only obtain low current ripples in certain operating points, the proposed approach can maintain a constant output current at all times even under large duty cycle dynamics due to the use of a valley-fill circuit. To validate the feasibility of the proposed approach, a 13 W prototype is built and tested experimentally.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"55 1","pages":"1-9"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90971550","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910764
M. Schulz, R. Marquardt, A. Mayer
The Modular High Frequency converter (MHF) is a new converter topology especially designed for vehicle applications. It enables ultra-light weight and volume by drastic reduction of passive components and cooling equipment. This paper deals with an optimized control strategy of the MHF that leads to minimized capacitance installed in the drive system.
{"title":"Optimized control strategy enabling minimized capacitance in Modular High Frequency converters","authors":"M. Schulz, R. Marquardt, A. Mayer","doi":"10.1109/EPE.2014.6910764","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910764","url":null,"abstract":"The Modular High Frequency converter (MHF) is a new converter topology especially designed for vehicle applications. It enables ultra-light weight and volume by drastic reduction of passive components and cooling equipment. This paper deals with an optimized control strategy of the MHF that leads to minimized capacitance installed in the drive system.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"5 1","pages":"1-8"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"90527192","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 : 2014-09-29DOI: 10.1109/EPE.2014.6910982
Y. Siwakoti, P. Loh, F. Blaabjerg, G. Town
Coupled inductors have lately been used with impedance-source networks for keeping their shoot-through times short, while providing higher voltage boosts. The parameter that is critical to the operation of such impedance network based converter with coupled inductors is the leakage inductances. However, the role of leakage inductances and its effect on the converter performance is often overlooked. This paper analyzes the effects of leakage inductances and demonstrates experimentally how the presence of leakage inductances degrades the performance of the converter.
{"title":"Effects of leakage inductances on magnetically-coupled impedance-source networks","authors":"Y. Siwakoti, P. Loh, F. Blaabjerg, G. Town","doi":"10.1109/EPE.2014.6910982","DOIUrl":"https://doi.org/10.1109/EPE.2014.6910982","url":null,"abstract":"Coupled inductors have lately been used with impedance-source networks for keeping their shoot-through times short, while providing higher voltage boosts. The parameter that is critical to the operation of such impedance network based converter with coupled inductors is the leakage inductances. However, the role of leakage inductances and its effect on the converter performance is often overlooked. This paper analyzes the effects of leakage inductances and demonstrates experimentally how the presence of leakage inductances degrades the performance of the converter.","PeriodicalId":6508,"journal":{"name":"2014 16th European Conference on Power Electronics and Applications","volume":"29 1","pages":"1-7"},"PeriodicalIF":0.0,"publicationDate":"2014-09-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84151267","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：