Pub Date : 2010-06-21DOI: 10.1109/IPEC.2010.5543449
Y. Zhan, P. Zhao
Grid code requirements on wind power plant are becoming more stringent as the wind power penetration level increasing. In order to identify the risk of incompliance with grid code requirements at the planning stage of a wind power plant project, a standard grid code study process has been established in Vestas. The study process includes steady state load flow, short circuit studies and transient low voltage ride through study. A suitable reactive power compensation device is identified from the study. An example study case is also included in this paper.
{"title":"Early assessment of grid code requirements for wind power plant in vestas","authors":"Y. Zhan, P. Zhao","doi":"10.1109/IPEC.2010.5543449","DOIUrl":"https://doi.org/10.1109/IPEC.2010.5543449","url":null,"abstract":"Grid code requirements on wind power plant are becoming more stringent as the wind power penetration level increasing. In order to identify the risk of incompliance with grid code requirements at the planning stage of a wind power plant project, a standard grid code study process has been established in Vestas. The study process includes steady state load flow, short circuit studies and transient low voltage ride through study. A suitable reactive power compensation device is identified from the study. An example study case is also included in this paper.","PeriodicalId":353540,"journal":{"name":"The 2010 International Power Electronics Conference - ECCE ASIA -","volume":"68 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116682888","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 : 2010-06-21DOI: 10.1109/IPEC.2010.5543507
L. Maharjan, T. Yamagishi, H. Akagi
This paper makes discussions on a battery energy storage system based on a multilevel cascade pulsewidth-modulated (PWM) converter for its practical use. Briefly discussed are several considerations including state-of-charge (SOC) balancing of multiple battery units, and fault tolerance of the system. An active-power control of individual converter cells is presented to make the multiple battery units charged or discharged at different power levels, producing a three-phase balanced line-to-line voltage. Experimental results obtained from a 200-V, 10-kW, 3.6-kWh battery energy storage system verify its effectiveness.
{"title":"Discussions on a battery energy storage system based on a cascade PWM converter with star configuration","authors":"L. Maharjan, T. Yamagishi, H. Akagi","doi":"10.1109/IPEC.2010.5543507","DOIUrl":"https://doi.org/10.1109/IPEC.2010.5543507","url":null,"abstract":"This paper makes discussions on a battery energy storage system based on a multilevel cascade pulsewidth-modulated (PWM) converter for its practical use. Briefly discussed are several considerations including state-of-charge (SOC) balancing of multiple battery units, and fault tolerance of the system. An active-power control of individual converter cells is presented to make the multiple battery units charged or discharged at different power levels, producing a three-phase balanced line-to-line voltage. Experimental results obtained from a 200-V, 10-kW, 3.6-kWh battery energy storage system verify its effectiveness.","PeriodicalId":353540,"journal":{"name":"The 2010 International Power Electronics Conference - ECCE ASIA -","volume":"2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124921654","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 : 2010-06-21DOI: 10.1109/IPEC.2010.5544556
Xiaofeng Wu, Zhiwei Wen, Dehong Xu, Y. Okuma, K. Mino
A novel passive integration structure based on flexible multi-layer foils was proposed for EMI filter in switching-mode power supply. Common mode (CM) inductors and capacitors, differential mode (DM) inductors and capacitors were all integrated in a single unit. This passive integration applied flexible multi-layer foils (FML). Prototypes were implemented for an 1kW switching power supply. The conductive EMI testing result was presented. The temperature rising and efficiency curves of the integrated EMI filter were also presented. In comparison with the discrete EMI filter, the prototype in this paper can reduce the volume by 32%.
{"title":"Design and experiment research of integrated EMI filter based on flexible multi-layer foils","authors":"Xiaofeng Wu, Zhiwei Wen, Dehong Xu, Y. Okuma, K. Mino","doi":"10.1109/IPEC.2010.5544556","DOIUrl":"https://doi.org/10.1109/IPEC.2010.5544556","url":null,"abstract":"A novel passive integration structure based on flexible multi-layer foils was proposed for EMI filter in switching-mode power supply. Common mode (CM) inductors and capacitors, differential mode (DM) inductors and capacitors were all integrated in a single unit. This passive integration applied flexible multi-layer foils (FML). Prototypes were implemented for an 1kW switching power supply. The conductive EMI testing result was presented. The temperature rising and efficiency curves of the integrated EMI filter were also presented. In comparison with the discrete EMI filter, the prototype in this paper can reduce the volume by 32%.","PeriodicalId":353540,"journal":{"name":"The 2010 International Power Electronics Conference - ECCE ASIA -","volume":"90 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122439513","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 : 2010-06-21DOI: 10.1109/IPEC.2010.5544511
T. Soeiro, J. Biela, J. Linner, P. Ranstad, J. Kolar
In this article the distortions caused by the pulsed operation of a group of power supplies (PS) feeding an Electrostatic Precipitator (ESP) are investigated, and means for improving the line quality are proposed. In order to reduce the Total Harmonic Distortions (THD) of the line current and also improve the loading balance between the phases, the pulses of the individual power supplies are scheduled and controlled together, so that the power consumption becomes more continuous. The proposed system optimization is experimentally verified with two commercially available ESP supplies, each having power capabilities of 120kW. The study shows the advantages of the pulses scheduling strategy namely reduction of both reactive power consumption and line current peaks; better current THD; better power balance among mains phases; and better utilization of mains components.
{"title":"Line power quality improvement for pulsed Electrostatic Precipitator systems","authors":"T. Soeiro, J. Biela, J. Linner, P. Ranstad, J. Kolar","doi":"10.1109/IPEC.2010.5544511","DOIUrl":"https://doi.org/10.1109/IPEC.2010.5544511","url":null,"abstract":"In this article the distortions caused by the pulsed operation of a group of power supplies (PS) feeding an Electrostatic Precipitator (ESP) are investigated, and means for improving the line quality are proposed. In order to reduce the Total Harmonic Distortions (THD) of the line current and also improve the loading balance between the phases, the pulses of the individual power supplies are scheduled and controlled together, so that the power consumption becomes more continuous. The proposed system optimization is experimentally verified with two commercially available ESP supplies, each having power capabilities of 120kW. The study shows the advantages of the pulses scheduling strategy namely reduction of both reactive power consumption and line current peaks; better current THD; better power balance among mains phases; and better utilization of mains components.","PeriodicalId":353540,"journal":{"name":"The 2010 International Power Electronics Conference - ECCE ASIA -","volume":"311 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122496774","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 : 2010-06-21DOI: 10.1109/IPEC.2010.5543355
T. Kato, Kaoru Inoue, Yudai Kumiki, M. Yamane
A fast and efficient steady-state simulation method of a power electronic (PE) system is proposed. The conventional methods are efficient only for a single-rate periodic system. The proposed method is efficient also for a multi-rate periodic system including a PE system which has a short switch and a long system periods. Its principle is based on a new extended combination of the envelope-following and the conventional shooting methods which solve the steady-state boundary value condition set efficiently. Furthermore the multiple shooting technique is utilized to solve circuit and sensitivity equations efficiently in parallel by a cluster computing system based on MPI (Message-Passing-Interface). Examples of a motor drive system controlled by a converter are analyzed and their results are validated for accuracy and computational efficiency.
{"title":"Efficient steady-state computation of a power electronic converter system by the envelope following method","authors":"T. Kato, Kaoru Inoue, Yudai Kumiki, M. Yamane","doi":"10.1109/IPEC.2010.5543355","DOIUrl":"https://doi.org/10.1109/IPEC.2010.5543355","url":null,"abstract":"A fast and efficient steady-state simulation method of a power electronic (PE) system is proposed. The conventional methods are efficient only for a single-rate periodic system. The proposed method is efficient also for a multi-rate periodic system including a PE system which has a short switch and a long system periods. Its principle is based on a new extended combination of the envelope-following and the conventional shooting methods which solve the steady-state boundary value condition set efficiently. Furthermore the multiple shooting technique is utilized to solve circuit and sensitivity equations efficiently in parallel by a cluster computing system based on MPI (Message-Passing-Interface). Examples of a motor drive system controlled by a converter are analyzed and their results are validated for accuracy and computational efficiency.","PeriodicalId":353540,"journal":{"name":"The 2010 International Power Electronics Conference - ECCE ASIA -","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122742465","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 : 2010-06-21DOI: 10.1109/IPEC.2010.5542389
S. Tesfahunegn, P. Vie, T. Undeland, O. Ulleberg
This paper proposes a combined steady state (SS) and dynamic model of a proton exchange membrane fuel cell (PEMFC) for use in distributed generation (DG) systems simulation. The SS fuel cell parameters associated with ohmic loss, activation overpotential and concentration over potential which are not easily accessible are estimated using a non-linear fitting of measured V-I fuel cell characteristics. Effect of fuel and air flow dynamics, electrical delay, and delay associated with fuel cell current reference feed back loop on the dynamics of the Nernst potential is modelled. The SS and dynamic models of the FC are then combined to establish a SIMULINK/SIMPOWER terminal model that can easily be interfaced in DG systems simulations. The model SS response is verified using voltage measurements taken by slowly varying the load (current). Simulation results, using SIMULINK/SIMPOWER, are then presented to demonstrate that the model works as desired both for SS and dynamic loads. To demonstrate its applicability in DG Systems simulations, the model is used in long time simulation of an example grid connected FC/Battery Hybrid power system.
{"title":"A combined steady state and dynamic model of a proton exchange membrane fuel cell for use in DG system simulation","authors":"S. Tesfahunegn, P. Vie, T. Undeland, O. Ulleberg","doi":"10.1109/IPEC.2010.5542389","DOIUrl":"https://doi.org/10.1109/IPEC.2010.5542389","url":null,"abstract":"This paper proposes a combined steady state (SS) and dynamic model of a proton exchange membrane fuel cell (PEMFC) for use in distributed generation (DG) systems simulation. The SS fuel cell parameters associated with ohmic loss, activation overpotential and concentration over potential which are not easily accessible are estimated using a non-linear fitting of measured V-I fuel cell characteristics. Effect of fuel and air flow dynamics, electrical delay, and delay associated with fuel cell current reference feed back loop on the dynamics of the Nernst potential is modelled. The SS and dynamic models of the FC are then combined to establish a SIMULINK/SIMPOWER terminal model that can easily be interfaced in DG systems simulations. The model SS response is verified using voltage measurements taken by slowly varying the load (current). Simulation results, using SIMULINK/SIMPOWER, are then presented to demonstrate that the model works as desired both for SS and dynamic loads. To demonstrate its applicability in DG Systems simulations, the model is used in long time simulation of an example grid connected FC/Battery Hybrid power system.","PeriodicalId":353540,"journal":{"name":"The 2010 International Power Electronics Conference - ECCE ASIA -","volume":"218 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133579551","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 : 2010-06-21DOI: 10.1109/IPEC.2010.5542372
K. Inoue, Y. Teranishi, M. Minamiyama, T. Kato
When the motor speed is reduced by using a regenerative brake, the mechanical energy of rotation can be converted to the regenerative electric energy. In order to improve the efficiency of the motor drive systems, optimal regenerative and acceleration torques of the motor should be discussed in order to maximize the regenerative electric energy and to minimize the required energy for acceleration. On this stand point, a design methodology of an optimal torque for a squirrel-cage induction motor (IM) has been proposed by means of the variational method. This method has been extended to the case that the torque amplitude limit is given. This paper gives a simple derivation procedure of the optimal torque in order to clarify that the derived optimal torque minimizes the total loss of IM. Then the effectiveness of the optimal torques are investigated by checking the electric energy of IM for various operation time periods.
{"title":"Electric energy comparison of an induction motor driven by optimal torques for various operation time periods","authors":"K. Inoue, Y. Teranishi, M. Minamiyama, T. Kato","doi":"10.1109/IPEC.2010.5542372","DOIUrl":"https://doi.org/10.1109/IPEC.2010.5542372","url":null,"abstract":"When the motor speed is reduced by using a regenerative brake, the mechanical energy of rotation can be converted to the regenerative electric energy. In order to improve the efficiency of the motor drive systems, optimal regenerative and acceleration torques of the motor should be discussed in order to maximize the regenerative electric energy and to minimize the required energy for acceleration. On this stand point, a design methodology of an optimal torque for a squirrel-cage induction motor (IM) has been proposed by means of the variational method. This method has been extended to the case that the torque amplitude limit is given. This paper gives a simple derivation procedure of the optimal torque in order to clarify that the derived optimal torque minimizes the total loss of IM. Then the effectiveness of the optimal torques are investigated by checking the electric energy of IM for various operation time periods.","PeriodicalId":353540,"journal":{"name":"The 2010 International Power Electronics Conference - ECCE ASIA -","volume":"17 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127010546","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 : 2010-06-21DOI: 10.1109/IPEC.2010.5542019
Tzung-Lin Lee, Yen-Ching Wang
Active front-end converters with bidirectional power flow capability have been extensively used for utility applications of power electronics, in which the hybrid type with copupling capacitor in series connection is receiving much attention due to its low operating voltage and low switching ripples. This paper proposes an improved control strategy for hybrid active front-end converters in grid-connected applications. Real power of the converter are controlled by adjusting the reactive current, while reactive power delivered to the power system is dependent on the real current of the converter. Due to series-connected capacitor, the converter can be operated between a low-voltage dc side and high-voltage grid side without any low-frequency transformer. Operation principles are explained in detail, and computer simulations and experimental results are provided to validate the effectiveness of the proposed approach.
{"title":"An improved control strategy for hybrid active front-end converters in grid-connected applications","authors":"Tzung-Lin Lee, Yen-Ching Wang","doi":"10.1109/IPEC.2010.5542019","DOIUrl":"https://doi.org/10.1109/IPEC.2010.5542019","url":null,"abstract":"Active front-end converters with bidirectional power flow capability have been extensively used for utility applications of power electronics, in which the hybrid type with copupling capacitor in series connection is receiving much attention due to its low operating voltage and low switching ripples. This paper proposes an improved control strategy for hybrid active front-end converters in grid-connected applications. Real power of the converter are controlled by adjusting the reactive current, while reactive power delivered to the power system is dependent on the real current of the converter. Due to series-connected capacitor, the converter can be operated between a low-voltage dc side and high-voltage grid side without any low-frequency transformer. Operation principles are explained in detail, and computer simulations and experimental results are provided to validate the effectiveness of the proposed approach.","PeriodicalId":353540,"journal":{"name":"The 2010 International Power Electronics Conference - ECCE ASIA -","volume":"440 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116509091","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 : 2010-06-21DOI: 10.1109/IPEC.2010.5543163
S. Shinnaka
This paper proposes a new generalized speed-varying ellipse voltage injection method for sensorless drive of PMSMs. The injected high-frequency voltage has unique spatially-rotating ellipse-shape, whose both amplitudes of the major and minor axes vary dependently of the motor speed. Although the voltage shape can be designed through selecting a design parameter, the associated high-frequency current can hold the speed-independence property, which allows stable rotor phase estimation even in wide speed range. Through selection of the design parameter, property of the high-frequency current can be adjusted so that the correlation between phases of the rotor and the major axis, and the norm ratio of negative/positive phase components can match appropriately a motor drive system. The current property is directly related to the phase estimation robustness.
{"title":"A novel generalized speed-varying ellipse voltage injection method for sensorless drive of salient-pole PMSMs","authors":"S. Shinnaka","doi":"10.1109/IPEC.2010.5543163","DOIUrl":"https://doi.org/10.1109/IPEC.2010.5543163","url":null,"abstract":"This paper proposes a new generalized speed-varying ellipse voltage injection method for sensorless drive of PMSMs. The injected high-frequency voltage has unique spatially-rotating ellipse-shape, whose both amplitudes of the major and minor axes vary dependently of the motor speed. Although the voltage shape can be designed through selecting a design parameter, the associated high-frequency current can hold the speed-independence property, which allows stable rotor phase estimation even in wide speed range. Through selection of the design parameter, property of the high-frequency current can be adjusted so that the correlation between phases of the rotor and the major axis, and the norm ratio of negative/positive phase components can match appropriately a motor drive system. The current property is directly related to the phase estimation robustness.","PeriodicalId":353540,"journal":{"name":"The 2010 International Power Electronics Conference - ECCE ASIA -","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128069494","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 : 2010-06-21DOI: 10.1109/IPEC.2010.5543302
Minh‐Khai Nguyen, Young-Gook Jung, Y. Lim
Single-phase quasi-Z-source AC-AC converter has a lower input current total harmonic distortion, higher input power factor and higher efficiency in comparison with the conventional single-phase Z-source AC-AC converter. This paper presents a safe-commutation strategy for the single-phase quasi-Z-source AC-AC converter. The converter only uses four switches without the use of a snubber circuit. The operating principle and steady-state analysis are presented. The experimental results show that the use of safe-commutation strategy is a significant improvement as it makes it possible to avoid voltage spikes on the switches.
{"title":"Single-phase quasi-Z-source AC-AC converter with safe-commutation strategy","authors":"Minh‐Khai Nguyen, Young-Gook Jung, Y. Lim","doi":"10.1109/IPEC.2010.5543302","DOIUrl":"https://doi.org/10.1109/IPEC.2010.5543302","url":null,"abstract":"Single-phase quasi-Z-source AC-AC converter has a lower input current total harmonic distortion, higher input power factor and higher efficiency in comparison with the conventional single-phase Z-source AC-AC converter. This paper presents a safe-commutation strategy for the single-phase quasi-Z-source AC-AC converter. The converter only uses four switches without the use of a snubber circuit. The operating principle and steady-state analysis are presented. The experimental results show that the use of safe-commutation strategy is a significant improvement as it makes it possible to avoid voltage spikes on the switches.","PeriodicalId":353540,"journal":{"name":"The 2010 International Power Electronics Conference - ECCE ASIA -","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2010-06-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132805084","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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